Enernoc (ENOC) 10-Q 7 Nov 14 2014 Q3 Quarterly report Financial data

Document_and_Entity_Informatio

Document and Entity Information	9 Months Ended
	Sep. 30, 2014	Nov. 03, 2014
Document And Entity Information [Abstract]	'	'
Document Type	'10-Q	'
Amendment Flag	'false	'
Document Period End Date	30-Sep-14	'
Document Fiscal Year Focus	'2014	'
Document Fiscal Period Focus	'Q3	'
Trading Symbol	'ENOC	'
Entity Registrant Name	'ENERNOC INC	'
Entity Central Index Key	'0001244937	'
Current Fiscal Year End Date	'--12-31	'
Entity Filer Category	'Accelerated Filer	'
Entity Common Stock, Shares Outstanding	'	29,175,394

Unaudited_Condensed_Consolidat

Unaudited Condensed Consolidated Balance Sheets (USD $)	Sep. 30, 2014	Dec. 31, 2013
In Thousands, unless otherwise specified
Current assets	'	'
Cash and cash equivalents	$246,215	$149,189
Restricted cash	1,097	1,834
Trade accounts receivable, net of allowance for doubtful accounts of $610 and $454 at September 30, 2014 and December 31, 2013, respectively	56,994	35,933
Unbilled revenue	156,432	66,675
Capitalized incremental direct customer contract costs	6,955	9,509
Deposits	2,063	252
Prepaid expenses and other current assets	11,218	6,610
Assets held for sale	'	681
Total current assets	480,974	270,683
Property and equipment, net of accumulated depreciation of $89,903 and $75,810 at September 30, 2014 and December 31, 2013, respectively	50,303	47,419
Goodwill	100,427	77,104
Customer relationship intangible assets, net	19,300	14,247
Other definite-lived intangible assets, net	5,467	2,939
Capitalized incremental direct customer contract costs, long-term	1,726	1,995
Deposits and other assets	6,641	1,568
Total assets	664,838	415,955
Current liabilities	'	'
Accounts payable	2,187	2,031
Accrued capacity payments	126,084	76,676
Accrued payroll and related expenses	16,268	13,370
Accrued expenses and other current liabilities	30,074	10,145
Accrued performance adjustments	373	1,720
Deferred revenue	13,143	20,625
Liabilities held for sale	'	521
Total current liabilities	188,129	125,088
Deferred acquisition consideration	832	566
Accrued acquisition contingent consideration	553	'
Convertible senior notes, net	137,907	'
Deferred tax liability	14,542	6,211
Deferred revenue	7,623	6,819
Other liabilities	7,575	7,776
Commitments and contingencies (Note 10)	'	'
Stockholders' equity	'	'
Undesignated preferred stock, $0.001 par value; 5,000,000 shares authorized; no shares issued	'	'
Common stock, $0.001 par value; 50,000,000 shares authorized, 29,229,284 and 29,920,807 shares issued and outstanding at September 30, 2014 and December 31, 2013, respectively	29	30
Additional paid-in capital	353,006	353,354
Accumulated other comprehensive loss	-3,219	-2,535
Accumulated deficit	-42,479	-81,354
Total EnerNOC, Inc. stockholders' equity	307,337	269,495
Noncontrolling interest	340	'
Total stockholders' equity	307,677	269,495
Total liabilities and stockholders' equity	$664,838	$415,955

Unaudited_Condensed_Consolidat1

Unaudited Condensed Consolidated Balance Sheets (Parenthetical) (USD $)	Sep. 30, 2014	Dec. 31, 2013
In Thousands, except Share data, unless otherwise specified
Statement of Financial Position [Abstract]	'	'
Accounts receivable	$610	$454
Accumulated depreciation	$89,903	$75,810
Undesignated preferred stock, par value	$0.00	$0.00
Undesignated preferred stock, shares authorized	5,000,000	5,000,000
Undesignated preferred stock, shares issued	0	0
Common stock, par value	$0.00	$0.00
Common stock, shares authorized	50,000,000	50,000,000
Common stock, shares issued	29,229,284	29,920,807
Common stock, shares outstanding	29,229,284	29,920,807

Unaudited_Condensed_Consolidat2

Unaudited Condensed Consolidated Statements of Income (USD $)	3 Months Ended		9 Months Ended
In Thousands, except Share data, unless otherwise specified	Sep. 30, 2014	Sep. 30, 2013	Sep. 30, 2014	Sep. 30, 2013
Revenues:	'	'	'	'
Grid operator	$291,848	$236,300	$350,592	$266,443
Utility	27,741	32,673	50,011	57,839
Enterprise	9,833	9,500	25,382	23,194
Total revenues	329,422	278,473	425,985	347,476
Cost of revenues	168,564	126,072	232,505	172,142
Gross profit	160,858	152,401	193,480	175,334
Operating expenses (income):	'	'	'	'
Selling and marketing	18,972	15,761	56,997	50,444
General and administrative	24,472	19,746	72,340	60,872
Research and development	5,260	4,535	15,432	14,125
Gain on sale of service line (Note 15)	-359	'	-3,737	'
Gain on the sale of assets (Note 16)	'	'	-2,171	'
Total operating expenses and income	48,345	40,042	138,861	125,441
Income from operations	112,513	112,359	54,619	49,893
Other (expense) income, net	-2,224	233	-1,276	-884
Interest expense	-1,523	-451	-2,576	-1,212
Income before income tax	108,766	112,141	50,767	47,797
Provision for income tax	-12,111	-5,284	-11,950	-5,828
Net income	96,655	106,857	38,817	41,969
Net loss attributable to noncontrolling interest	-18	'	-58	'
Net income attributable to EnerNOC, Inc.	$96,673	$106,857	$38,875	$41,969
Net income per common share	'	'	'	'
Basic	$3.48	$3.83	$1.38	$1.52
Diluted	$3.11	$3.70	$1.33	$1.47
Weighted average number of common shares used in computing net income per common share	'	'	'	'
Basic	27,795,154	27,920,409	28,075,291	27,693,054
Diluted	31,434,164	28,843,010	30,074,187	28,616,552

Unaudited_Condensed_Consolidat3

Unaudited Condensed Consolidated Statements of Comprehensive Income (USD $)	3 Months Ended		9 Months Ended
In Thousands, unless otherwise specified	Sep. 30, 2014	Sep. 30, 2013	Sep. 30, 2014	Sep. 30, 2013
Statement of Comprehensive Income [Abstract]	'	'	'	'
Net income	$96,655	$106,857	$38,817	$41,969
Foreign currency translation adjustments	-1,572	55	-678	-987
Comprehensive income	95,083	106,912	38,139	40,982
Comprehensive loss attributable to noncontrolling interest	-18	'	-52	'
Comprehensive income attributable to EnerNOC, Inc.	$95,101	$106,912	$38,191	$40,982

Unaudited_Condensed_Consolidat4

Unaudited Condensed Consolidated Statements of Cash Flows (USD $)	9 Months Ended
In Thousands, unless otherwise specified	Sep. 30, 2014	Sep. 30, 2013
Cash flows from operating activities	'	'
Net income	$38,817	$41,969
Adjustments to reconcile net income to net cash provided by operating activities:	'	'
Depreciation	16,414	15,356
Amortization of acquired intangible assets	6,753	5,260
Stock based compensation expense	12,161	11,832
Excess tax benefit related to exercise of options, restricted stock and restricted stock units	-219	-999
Gain on sale of service line	-3,737	'
Gain on sale of assets	-2,171	'
Impairment of equipment	533	503
Impairment of definite lived intangible assets	323	'
Unrealized foreign exchange transaction (gain) loss	2,417	2,108
Deferred taxes	5,594	2,157
Non-cash interest expense	861	234
Accretion of fair value of deferred purchase price and accrued contingent purchase price consideration related to acquisitions	291	88
Other, net	371	29
Changes in operating assets and liabilities, net of effects of acquisitions:	'	'
Accounts receivable, trade	-19,957	-26,643
Unbilled revenue	-89,783	-73,308
Prepaid expenses and other current assets	-1,524	-2,757
Capitalized incremental direct customer contract costs	2,910	8,377
Other assets	225	-113
Other noncurrent liabilities	-515	6,884
Deferred revenue	-6,709	-6,677
Accrued capacity payments	49,660	47,941
Accrued payroll and related expenses	1,466	-1,103
Accounts payable, accrued performance adjustments and accrued expenses and other current liabilities	15,531	2,321
Net cash provided by operating activities	29,712	33,459
Cash flows from investing activities	'	'
Purchases of property and equipment	-19,248	-32,925
Payments made for acquisitions, net of cash acquired	-36,406	'
Payments made for investments	-2,500	'
Proceeds from sale of service line	4,275	'
Proceeds from sale of assets	2,171	'
Change in restricted cash and deposits	-1,349	-179
Payments made for acquisition of customer contract	-403	-699
Net cash used in investing activities	-53,460	-33,803
Cash flows from financing activities	'	'
Proceeds from convertible debt offering	155,277	'
Proceeds from exercises of stock options	1,456	1,369
Payments made for buy back of common stock	-29,973	-5,000
Payments related to employee restricted stock minimum tax withholdings	-5,874	'
Excess tax benefit related to exercise of options, restricted stock and restricted stock units	219	999
Net cash used in financing activities	121,105	-2,632
Effects of exchange rate changes on cash and cash equivalents	-331	-835
Net change in cash and cash equivalents	97,026	-3,811
Cash and cash equivalents at beginning of period	149,189	115,041
Cash and cash equivalents at end of period	246,215	111,230
Non-cash financing and investing activities	'	'
Issuance of common stock in satisfaction of bonuses	$145	$154

Description_of_Business_and_Ba

Description of Business and Basis of Presentation

9 Months Ended

Sep. 30, 2014

Accounting Policies [Abstract]

'

Description of Business and Basis of Presentation

'

1. Description of Business and Basis of Presentation

Description of Business

EnerNOC, Inc. (the Company) is a leading provider of energy intelligence software, or EIS, and related solutions. The Company unlocks the full value of energy management for commercial, institutional and industrial end-users of energy, which the Company refers to as its C&I or enterprise customers, as well as electric power grid operators and utilities by delivering a comprehensive suite of demand-side management solutions. The Company’s EIS and related solutions help its customers buy energy better, use less energy and be more strategic about when they consume energy in order to reduce overall energy spend and maximize productivity of that spend.

The Company’s EIS and related solutions provide technology-enabled demand response, demand management, utility bill management, supply management, visibility and reporting, facility optimization, and project management applications and services for its enterprise, electric power grid operator and utility customers. Demand response is an alternative to traditional electric power generation and transmission infrastructure projects that enables electric power grid operators and utilities to reduce the likelihood of service disruptions, such as brownouts and blackouts, during periods of peak electricity demand, and otherwise manage the electric power grid during short-term imbalances of supply and demand or during periods when energy prices are high. The Company’s solutions for utilities and grid operators include EnerNOC Demand Resource™, a turnkey demand response resource with a firm capacity commitment, and EnerNOC Demand Manager™, a Software-as-a-Service (SaaS) application that provides utilities and energy retailers with the underlying technology to manage their demand response programs and secure reliable demand-side resources. When the Company enters into an EnerNOC Demand Resource contract, it matches obligation, in the form of megawatts, or MW, that it agrees to deliver to its utility and electric power grid operator customers, with supply, in the form of MW that the Company is able to curtail from the electric power grid through its arrangements with its enterprise customers. When the Company is called upon by its utility or electric power grid operator customers to deliver its contracted capacity, the Company uses its Network Operations Center, or NOC, to remotely manage and reduce electricity consumption across its growing network of enterprise customer sites, making demand response capacity available to electric power grid operators and utilities on demand while helping enterprise customers achieve energy savings, improve financial results and realize environmental benefits. The Company receives recurring payments from electric power grid operators and utilities for providing its EnerNOC Demand Resource and the Company shares these recurring payments with its enterprise customers in exchange for those enterprise customers reducing their power consumption when called upon by the Company to do so. The Company occasionally reallocates and realigns its capacity supply and obligation through open market bidding programs, supplemental demand response programs, auctions or other similar capacity arrangements and bilateral contracts to account for changes in supply and demand forecasts, as well as changes in programs and market rules in order to achieve more favorable pricing opportunities. The Company refers to the above activities as managing its portfolio of demand response capacity. The Company’s EnerNOC Demand Manager product consists of long-term contracts with a utility customer for a SaaS solution that allows utilities to manage demand response capacity in utility-sponsored demand response programs. The Company’s EnerNOC Demand Manager provides its utility customers with real-time load monitoring, dispatching applications, customizable reports, measurement and verification, and other professional services.

The Company builds on its position as the world’s leading demand response provider by using its EIS to provide its enterprise customers with the ability to:

•

manage energy supplier selection, procurement and implementation;

•

manage energy budget forecasting;

•

manage utility bills and payment; and

•

measure, track, analyze, report and manage greenhouse gas emissions.

The Company’s EIS and related solutions provide its enterprise customers with the visibility they need to prioritize resources against the activities that will deliver the highest return on investment.

During the third quarter of fiscal 2014, the Company began to offer its EIS and related solutions at three subscription levels: basic, standard, and professional. The Company delivers SaaS solutions on all of the major Internet browsers and on leading mobile device operating systems. In addition to its EIS packages, the Company sells a data-driven energy efficiency suite of premium consulting and custom training services, including technology integration services, supply consulting, energy efficiency planning, audits, assessments, commissioning and retro-commissioning services, which are available for an hourly or fixed fee. The Company’s target customers for its EIS and related solutions, to which it sells primarily through the Company’s direct sales force, are enterprises that spend approximately $100,000/year per site or more on energy.

Since inception, the Company’s business has grown substantially. The Company began by providing its demand response solutions in one state in the United States in 2003 and has expanded to providing its EIS and related solutions in several regions throughout the United States, as well as internationally in Australia, Brazil, China, Germany, India, Ireland, Japan, New Zealand, South Korea and the United Kingdom.

Reclassifications

The Company has reclassified certain amounts in its unaudited condensed consolidated statements of income for the three and nine month periods ended September 30, 2013, to conform to the 2014 presentation. The reclassifications made relate to the presentation of the Company’s revenues from DemandSMART and EfficiencySMART, SupplySMART and other revenues to revenues from grid operators, revenues from utilities, and revenues from enterprise customers and was done in order to provide the users of its consolidated financial statements with additional insight into how the Company and its management view and evaluate its revenues and related growth. This reclassification within the unaudited condensed consolidated statements of income for the three and nine month periods ended September 30, 2013 had no impact on previously reported total consolidated revenues or consolidated results of operations.

Presentational Changes

The Company has recorded certain adjustments related to the presentation of revenue and cost of revenue in its consolidated statement of operations for the three and nine months ended September 30, 2014. The Company has historically recorded revenue and cost of revenues net (as an agent) for certain transactions with C&I customers and upon further analysis during the quarter ended September 30, 2014, the Company concluded revenue and cost of revenues for these transactions should be recorded gross (as a principal). The Company assessed the materiality of the historical misstatements, individually and in aggregate, on its prior annual and quarterly consolidated financial statements and concluded the effect of the error was not material to its consolidated financial statements for any of the periods. The Company recorded an adjustment in the consolidated statement of income for the three months ended September 30, 2014 to correct the presentation of such revenues on a year-to-date basis. This correction resulted in an increase to both grid operator revenue and cost of revenue of $4,344 for the three month period ended September 30, 2014.

Basis of Consolidation

The unaudited condensed consolidated financial statements of the Company include the accounts of its wholly-owned subsidiaries and have been prepared in conformity with accounting principles generally accepted in the United States (GAAP) and variable interest entities (VIE) in which the Company has variable interests are consolidated as the Company is the primary beneficiary and thus controls the VIE. Intercompany transactions and balances are eliminated upon consolidation.

On February 13, 2014, the Company acquired all of the outstanding capital stock of Entelios AG (Entelios) and all of the outstanding capital stock of Activation Energy DSU Limited (Activation) in separate purchase business combinations.

On April 2, 2014, the Company completed an acquisition of all of the outstanding stock of an international demand response entity.

On April 17, 2014, the Company completed acquisitions of all of the outstanding stock of EnTech Utility Service Bureau, Inc. (Entech US) and EnTech Utility Service Bureau Ltd. (Entech UK) and on May 9, 2014, the Company completed the acquisition of the remaining 50% ownership in EnTech USB Private Limited (Entech India), which was a joint venture between EnTech US and a third party (collectively all referred to as, Entech).

The results of operations of the acquired entities discussed above are included in the Company’s unaudited condensed consolidated statement of income from the date of acquisition forward.

Subsequent Events Consideration

The Company considers events or transactions that occur after the balance sheet date but prior to the issuance of the financial statements to provide additional evidence relative to certain estimates or to identify matters that require additional disclosure. Subsequent events have been evaluated as required.

On October 9, 2014, the Company entered into an amendment to its lease for its principal executive offices (the July 5, 2012 Lease) to lease additional space. The Company’s lease for this additional space will commence on or about January 1, 2015, which is the date on which the Company has the right to control access and physical use of the leased space, and will be subject to the terms and conditions of the July 5, 2012 Lease. The lease term for the additional space shall coincide with the term for the July 5, 2012 Lease and expire on July 31, 2020 unless earlier terminated or further extended as provided in the July 5, 2012 Lease. The lease amendment contains both a rent holiday, under which lease payments do not commence until June 2015, and escalating rental payments. As a result, the Company will record rent on a straight-line basis in accordance with ASC 840, Leases, beginning upon the lease commencement date.

On November 4, 2014, the Company and one of its wholly-subsidiaries (Purchaser) entered into a definitive agreement and plan of merger (the Merger Agreement), to acquire World Energy Solutions, Inc., a Delaware corporation (the Target). Pursuant to the Merger Agreement, Purchaser will commence an offer (the Offer) to acquire all of the outstanding shares of the Target’s common stock, par value $0.0001 per share (the Shares) for $5.50 per share net to the seller in cash, without interest, subject to any required withholding of taxes. In addition to purchasing the Shares, the Company will assume the Target’s outstanding debt for a total transaction value of approximately $76,000 in cash. Completion of the Offer is subject to several conditions, including (i) that a majority of the shares outstanding (determined on a fully diluted basis) be validly tendered and not validly withdrawn prior to the expiration of the Offer; (ii) the absence of a material adverse effect on the Target; and (iii) certain other customary conditions. The Offer is not subject to a financing condition.

There were no other material recognizable subsequent events recorded or requiring disclosure in the September 30, 2014 unaudited condensed consolidated financial statements.

Use of Estimates in Preparation of Financial Statements

The accompanying unaudited condensed consolidated financial statements have been prepared pursuant to the rules and regulations of the Securities and Exchange Commission (SEC). Certain information and footnote disclosures normally included in financial statements prepared in accordance with GAAP have been condensed or omitted pursuant to SEC rules and regulations. In the opinion of the Company’s management, the unaudited condensed consolidated financial statements and notes thereto have been prepared on the same basis as the audited consolidated financial statements contained in the Company’s Annual Report on Form 10-K for the fiscal year ended December 31, 2013, and include all adjustments (consisting of normal, recurring adjustments) necessary for the fair presentation of the Company’s financial position at September 30, 2014 and statements of income, statements of comprehensive income and statements of cash flows for the three and nine month periods ended September 30, 2014 and 2013. Operating results for the three and nine month periods ended September 30, 2014 are not necessarily indicative of the results to be expected for any other interim period or the entire fiscal year ending December 31, 2014 (fiscal 2014).

The preparation of these unaudited condensed consolidated financial statements requires the Company to make estimates and judgments that affect the reported amounts of assets, liabilities, revenues and expenses, and related disclosure of contingent assets and liabilities. On an on-going basis, the Company evaluates its estimates, including those related to revenue recognition, allowance for doubtful accounts, valuations and purchase price allocations related to business combinations, fair value of deferred acquisition consideration, fair value of accrued acquisition contingent consideration, expected future cash flows including growth rates, discount rates, terminal values and other assumptions and estimates used to evaluate the recoverability of long-lived assets and goodwill, estimated fair values of intangible assets and goodwill, amortization methods and periods, certain accrued expenses and other related charges, stock-based compensation, contingent liabilities, fair value of asset retirement obligations, tax reserves and recoverability of the Company’s net deferred tax assets and related valuation allowance.

Although the Company regularly assesses these estimates, actual results could differ materially. Changes in estimates are recorded in the period in which they become known. The Company bases its estimates on historical experience and various other assumptions that it believes to be reasonable under the circumstances. Actual results may differ from management’s estimates if these results differ from historical experience or other assumptions prove not to be substantially accurate, even if such assumptions are reasonable when made.

The Company is subject to a number of risks similar to those of other companies of similar and different sizes both inside and outside of its industry, including, but not limited to, rapid technological changes, competition from similar energy management applications, services and products provided by larger companies, customer concentration, government regulations, market or program rule changes, protection of proprietary rights and dependence on key individuals.

Revenue Recognition

The Company recognizes revenues in accordance with Accounting Standards Codification (ASC) 605, Revenue Recognition (ASC 605). In all of the Company’s arrangements, it does not recognize any revenues until it can determine that persuasive evidence of an arrangement exists, delivery has occurred, the fee is fixed or determinable, and it deems collection to be reasonably assured. In making these judgments, the Company evaluates the following criteria:

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Evidence of an arrangement. The Company considers a definitive agreement signed by the customer and the Company or an arrangement enforceable under the rules of an open market bidding program to be representative of persuasive evidence of an arrangement.

•

Delivery has occurred. The Company considers delivery to have occurred when service has been delivered to the customer and no significant post-delivery obligations exist. In instances where customer acceptance is required, delivery is deemed to have occurred when customer acceptance has been achieved.

•

Fees are fixed or determinable. The Company considers fees to be fixed or determinable unless the fees are subject to refund or adjustment or are not payable within normal payment terms. If the fee is subject to refund or adjustment and the Company cannot reliably estimate this amount, the Company recognizes revenues when the right to a refund or adjustment lapses. If the Company offers payment terms significantly in excess of its normal terms, it recognizes revenues as the amounts become due and payable or upon the receipt of cash.

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Collection is reasonably assured. The Company conducts a credit review at the inception of an arrangement to determine the creditworthiness of the customer. Collection is reasonably assured if, based upon evaluation, the Company expects that the customer will be able to pay amounts under the arrangement as payments become due. If the Company determines that collection is not reasonably assured, revenues are deferred and recognized upon the receipt of cash.

The Company maintains a reserve for customer adjustments and allowances as a reduction in revenues. In determining the Company’s revenue reserve estimate, and in accordance with company policy, the Company relies on historical data and known performance adjustments. These factors, and unanticipated changes in the economic and industry environment, could cause the Company’s reserve estimates to differ from actual results. The Company records a provision for estimated customer adjustments and allowances in the same period as the related revenues are recorded. These estimates are based on the specific facts and circumstances of a particular program, analysis of credit memo data, historical customer adjustments, and other known factors. If the data the Company uses to calculate these estimates does not properly reflect reserve requirements, then a change in the allowances would be made in the period in which such a determination is made and revenues in that period could be affected. As of September 30, 2014 and December 31, 2013, the Company’s revenue reserves were $475 and $475, respectively.

Revenues from grid operators and revenues from utilities principally represent demand response revenues. During the three and nine month periods ended September 30, 2014, revenues from grid operators and utilities were comprised of $318,629 and $396,057 of demand response revenues, respectively, and $960 and $4,546 of EIS and related solutions revenues, respectively. During the three and nine month periods ended September 30, 2013, revenues from grid operators and utilities were comprised of $267,376 and $318,362 of demand response revenues, respectively, and $1,597 and $5,920 of EIS and solutions revenues, respectively.

All revenues from enterprise customers for the three and nine month periods ended September 30, 2014 and 2013 were derived from EIS and related solutions.

Demand Response Revenues

The Company enters into contracts and open market bidding programs with utilities and electric power grid operators to provide demand response applications and services. Currently the Company has two principal service offerings under which it provides demand response applications and services: (1) full-service turnkey offering to utilities under which it manages all aspects of demand response program delivery to deliver a firm capacity resource (Demand Resource) and (2) utility partnership offering under which utilities can utilize software through a software as a service offering, integrated metering hardware, and professional services to support their tariff-based C&I demand response programs on a service-level agreement basis (Demand Manager).

The Company has evaluated the factors within ASC 605 regarding gross versus net revenue reporting for its demand response revenues and its payments to C&I customers. Based on the evaluation of the factors within ASC 605, the Company has determined that all of the applicable indicators of gross revenue reporting were met. The applicable indicators of gross revenue reporting included, but were not limited to, the following:

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The Company is the primary obligor in its arrangements with electric power grid operators and utility customers because the Company provides its demand response services directly to electric power grid operators and utilities under long-term contracts or pursuant to open market programs and contracts separately with C&I customers to deliver such services. The Company manages all interactions with the electric power grid operators and utilities, while C&I customers do not interact with the electric power grid operators and utilities. In addition, the Company assumes the entire performance risk under its arrangements with electric power grid operators and utility customers, including the posting of financial assurance to assure timely delivery of committed capacity with no corresponding financial assurance received from its C&I customers. In the event of a shortfall in delivered committed capacity, the Company is responsible for all penalties assessed by the electric power grid operators and utilities without regard for any recourse the Company may have with its C&I customers.

•

The Company has latitude in establishing pricing, as the pricing under its arrangements with electric power grid operators and utilities is negotiated through a contract proposal and contracting process or determined through a capacity auction. The Company then separately negotiates payments to C&I customers and has complete discretion in the contracting process with the C&I customers.

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The Company has complete discretion in determining which suppliers (C&I customers) will provide the demand response services, provided that the C&I customer is located in the same region as the applicable electric power grid operator or utility.

•

The Company is involved in both the determination of service specifications and performs part of the services, including the installation of metering and other equipment for the monitoring, data gathering and measurement of performance, as well as, in certain circumstances, the remote control of C&I customer loads.

As a result, the Company has concluded that it earns revenue (as a principal) from the delivery of demand response services to electric power grid operators and utility customers and records the amounts billed to the electric power grid operators and utility customers as gross demand response revenues and the amounts paid to C&I customers as cost of revenues.

EnerNOC Demand Resource Solution

The majority of the Company’s demand response revenues are generated from the EnerNOC Demand Resource solution. Demand response revenues consist of two elements: revenue earned from the Company’s ability to deliver committed capacity to its electric power grid operator and utility customers, which the Company refers to as capacity revenue; and revenue earned from additional payments made to the Company for the amount of energy usage actually curtailed from the grid during a demand response event, which the Company refers to as energy event revenue.

The Company recognizes demand response revenue when it has provided verification to the electric power grid operator or utility of its ability to deliver the committed capacity which entitles the Company to payments under the contract or open market program. Committed capacity is generally verified through the results of an actual demand response event or a measurement and verification test. Once the capacity amount has been verified, the revenue is recognized and future revenue becomes fixed or determinable and is recognized monthly until the next demand response event or test. In subsequent verification events, if the Company’s verified capacity is below the previously verified amount, the electric power grid operator or utility customer will reduce future payments based on the adjusted verified capacity amounts. Ongoing demand response revenue recognized between demand response events or tests that are not subject to penalty or customer refund are recognized in revenue. If the revenue is subject to refund and the amount of refund cannot be reliably estimated, the revenue is deferred until the right of refund lapses.

Commencing in fiscal 2012, all demand response capacity revenues related to the Company’s participation in the PJM open market program for its Limited demand response product (referred to as the PJM summer-only open market program in prior filings) are being recognized at the end of the four-month delivery period of June through September, or during the three month period ended September 30th of each year. Because the period during which the Company is required to perform (June through September) is shorter than the period over which payments are received under the program (June through May), a portion of the revenues that have been earned are recorded and accrued as unbilled revenue. Substantially all revenues related to the PJM open market program for the program year ended September 30, 2014 were recognized during the three month period ended September 30, 2014 and as a result of the billing period not coinciding with the revenue recognition period, the Company had $155,102 in unbilled revenues from PJM at September 30, 2014.

With respect to the PJM open market program, the Company commenced participation in a new service offering within this program on June 1, 2014. Under this new service delivery offering, which the Company refers to as the PJM Extended demand response program, the delivery period is from June through October and then May in the subsequent calendar year. The revenues and any associated penalties, if any, for underperformance related to participation in the PJM Extended demand response program are separate and distinct from the Company’s participation in other offerings within the PJM open market program. Under the PJM Extended demand response program, penalties incurred as a result of underperformance for a demand response event dispatched during the months of June through September and for a demand response test event are the same as the historical service offering in which the Company has participated, which the Company refers to as the PJM Limited demand response program. However, penalties incurred as a result of underperformance for an event dispatched during the month of October or the month of May are 1/52 multiplied by the number of the shortfall amount (committed capacity less actual delivered capacity) times the applicable capacity rate. Consistent with the PJM Limited demand response program, the Company notes that the fees could potentially be subject to adjustment or refund based on performance during the applicable performance period. The revenue will be recognized ratably over the delivery period if the Company can reliably estimate the amount of fees potentially subject to adjustment or refund as of the end of September, otherwise revenues related to its participation in this program would be recognized at the end of the delivery period. For the PJM Extended demand response delivery period that commenced on June 1, 2014 and ends on May 31, 2015, the potential fees that could be earned are not material, however, for subsequent years beyond the delivery period ending on May 31, 2015, the potential fees from participation in the PJM Extended demand response program could be material.

Demand response capacity revenues related to the Company’s participation in an open market program in Western Australia are potentially subject to refund and therefore, are deferred until a portion of such capacity revenues are reliably estimable which currently occurs upon an emergency event dispatch or until the end of the program period on September 30th. Historically all capacity revenues have been recognized during the three month period ended September 30th as there have previously been no emergency event dispatches. During the three month period ended June 30, 2014, there was an emergency event dispatch in this open market program and as a result, a portion of the capacity revenues were fixed and no longer subject to adjustment resulting in the recognition of $4,344 of capacity revenues and $1,982 of related cost of revenues during the three month period ended June 30, 2014. As of September 30, 2014, the Company determined that the amount of fees potentially subject to adjustment or refund was reliably estimable beginning with the new program year in Western Australia commencing on October 1, 2014. Therefore, future revenues will be recognized ratably over the delivery period from October 1 to September 30.

Energy event revenues are recognized when earned. Energy event revenue is deemed to be substantive and represents the culmination of a separate earnings process and is recognized when the energy event is initiated by the electric power grid operator or utility customer and the Company has responded under the terms of the contract or open market program. During the three and nine month periods ended September 30, 2014, the Company recognized $1,352 and $26,121, respectively, of energy event revenues, and during the three and nine month periods ended September 30, 2013, the Company recognized $19,281 and $23,440, respectively, of energy event revenues.

In 2012, the Company decided to net settle a portion of its future contractual delivery obligations in a certain open market bidding program. As of September 30, 2014, the Company entered into transactions to net settle a significant portion of its future delivery obligations and these transactions have been approved by the customer. As a result, as long as the other criteria for revenue recognition are met, the Company will recognize these fees from the net settlement transactions as revenues as they become due and payable with such fees being recorded as a component of grid operator revenues. During the three and nine month periods ended September 30, 2014, the Company recognized revenues of $3,523 and $11,325, respectively, related to these net settlement transactions.

The Company has evaluated the forward capacity programs in which it participates and has determined that its contractual obligations in these programs do not currently meet the definition of derivative contracts under ASC 815, Derivatives and Hedging (ASC 815).

EnerNOC Demand Manager Solution

Under the Company’s EnerNOC Demand Manager solution, the Company generally receives an ongoing fee for overall management of the utility demand response program based on enrolled capacity or enrolled C&I customers, which is not subject to adjustment based on performance during a demand response dispatch. The Company recognizes revenues from these fees ratably over the applicable service delivery period commencing upon when the C&I customers have been enrolled and the contracted services have been delivered. In addition, under this offering, the Company may receive additional fees for program start-up, as well as, for C&I customer installations. The Company has determined that these fees do not have stand-alone value as such services do not have value without the ongoing services related to the overall management of the utility demand response program. Therefore, the Company recognizes these fees over the estimated customer relationship period, which is generally the greater of three years or the contract period, commencing upon the enrollment of the C&I customers and delivery of the contracted services. Through September 30, 2014, revenues from EnerNOC Demand Manager have not been material to the Company’s consolidated results of operations.

Enterprise EIS and Related Solutions

The Company’s enterprise EIS and related solutions revenues generally represent ongoing software or service arrangements under which the revenues are recognized ratably over the service period commencing upon delivery of the contracted service with the customer. Under certain of the Company’s arrangements, a portion of the fees received may be subject to adjustment or refund based on the validation of the energy savings delivered after the implementation is complete. As a result, the Company defers the portion of the fees that are subject to adjustment or refund until such time as the right of adjustment or refund lapses, which is generally upon completion and validation of the implementation. In addition, under certain other of the Company’s arrangements, the Company sells proprietary equipment to C&I customers that is utilized to provide the ongoing services that the Company delivers. Currently, this equipment has been determined to not have stand-alone value. As a result, the Company defers revenues associated with the equipment and begins recognizing such revenue ratably over the expected C&I customer relationship period (generally three years), once the C&I customer is receiving the ongoing services from the Company. In addition, the Company capitalizes the associated direct and incremental costs, which primarily represent the equipment and third-party installation costs, and recognizes such costs over the expected C&I customer relationship period.

The Company follows the provisions of ASC Update No. 2009-13, Multiple-Deliverable Revenue Arrangements (ASU 2009-13). The Company typically determines the selling price of its services based on vendor specific objective evidence (VSOE). Consistent with its methodology under previous accounting guidance, the Company determines VSOE based on its normal pricing and discounting practices for the specific service when sold on a stand-alone basis. In determining VSOE, the Company’s policy is to require a substantial majority of selling prices for a product or service to be within a reasonably narrow range. The Company also considers the class of customer, method of distribution, and the geographies into which its products and services are sold when determining VSOE. The Company typically has had VSOE for its products and services.

In certain circumstances, the Company is not able to establish VSOE for all deliverables in a multiple element arrangement. This may be due to the infrequent occurrence of stand-alone sales for an element, a limited sales history for new services or pricing within a broader range than permissible by the Company’s policy to establish VSOE. In those circumstances, the Company proceeds to the alternative levels in the hierarchy of determining selling price. Third Party Evidence (TPE) of selling price is established by evaluating largely similar and interchangeable competitor products or services in stand-alone sales to similarly situated customers. The Company is typically not able to determine TPE and has not used this measure since the Company has been unable to reliably verify standalone prices of competitive solutions. Management’s best estimate of selling price (ESP) is established in those instances where neither VSOE nor TPE are available, by considering internal factors such as margin objectives, pricing practices and controls, customer segment pricing strategies and the product life cycle. Consideration is also given to market conditions such as competitor pricing information gathered from experience in customer negotiations, market research and information, recent technological trends, competitive landscape and geographies. Use of ESP is limited to a very small portion of the Company’s services, principally certain other EIS software and related solutions.

Foreign Currency Translation

Foreign currency translation adjustments are recorded as a component of stockholders’ equity within accumulated other comprehensive loss. Gains (losses) arising from transactions denominated in foreign currencies and the re-measurement of certain intercompany receivables and payables are included in other (expense) income, net in the unaudited condensed consolidated statements of income and were ($2,459) and $167 for the three month periods ended September 30, 2014 and 2013, respectively, and ($1,825) and ($1,156) for the nine month periods ended September 30, 2014 and 2013, respectively. Foreign currency exchange gains (losses) resulted primarily from foreign denominated intercompany receivables held by the Company from one of its Australian subsidiaries which mainly resulted from funding provided to complete the acquisition of Energy Response Holdings Pty Ltd (Energy Response) and fluctuations in the Australian dollar exchange rate, in addition to U.S. dollar denominated intercompany payables to the Company from one of its German subsidiaries and one of its UK subsidiaries which mainly resulted from funding provided to complete the acquisitions of Entelios and EnTech, respectively. During the three and nine month periods ended September 30, 2014, $146 ($182 Australian) and $6,447 ($6,881 Australian), respectively, of the intercompany receivable from the Company’s Australian subsidiary was settled resulting in a realized loss of $660 for the nine month period ended September 30, 2014. During the three and nine month periods ended September 30, 2013, $333 ($375 Australian) and $12,142 ($11,796 Australian), respectively, of the intercompany receivable from the Company’s Australian subsidiary was settled resulting in a realized loss of $54 and $402, respectively. During the three and nine month periods ended September 30, 2014 and 2013, there were no other material realized gains (losses) incurred related to transactions denominated in foreign currencies.

As of September 30, 2014, the Company had an intercompany receivable from its Australian subsidiary that is denominated in Australian dollars and not deemed to be of a “long-term investment” nature totaling $9,464 at September 30, 2014 exchange rates ($10,836 Australian). The decrease in the Australian intercompany receivable from December 31, 2013 was primarily due to intercompany settlements made during the nine month period ended September 30, 2014 offset by royalties and other support charges due to the U.S. parent for services and technology provided by the U.S. parent during the nine month period ended September 30, 2014. Two of the Company’s German subsidiaries had an intercompany payable to the Company that is denominated in U.S. dollars and not deemed to be of a “long-term investment” nature totaling $21,132 at September 30, 2014; and two of its UK subsidiaries had an intercompany payable to the Company that is denominated in U.S. dollars and not deemed to be of a “long-term investment” nature totaling $4,481 at September 30, 2014.

In addition, a portion of the funding provided by the Company to one of its Australian subsidiaries to complete the acquisition of Energy Response was deemed to be of a “long-term investment nature” and therefore, the resulting translation adjustments are being recorded as a component of stockholders’ equity within accumulated other comprehensive loss. As of September 30, 2014, the intercompany funding that is denominated in Australian dollars and deemed to be of a “long-term investment” nature totaled $21,671 at September 30, 2014 exchange rates ($20,364 Australian) and during the three and nine month periods ended September 30, 2014, the Company recorded translation adjustments of ($1,385) and ($389), respectively, related to this intercompany funding within accumulated other comprehensive loss.

Comprehensive Income

Comprehensive income is defined as the change in equity of a business enterprise during a period resulting from transactions and other events and circumstances from non-owner sources. As of September 30, 2014 and December 31, 2013, accumulated other comprehensive loss was comprised solely of cumulative foreign currency translation adjustments. The Company presents its components of other comprehensive income net of related tax effects, which have not been material to date.

Software Development Costs

Software development costs, including license fees and external consulting costs, of $1,507 and $1,523 for the three month periods ended September 30, 2014 and 2013, respectively, and $4,648 and $5,835 for the nine month periods ended September 30, 2014 and 2013, respectively, have been capitalized in accordance with ASC 350-40, Internal-Use Software (ASC 350-40). The capitalized amount was included as software in property and equipment at September 30, 2014 and December 31, 2013. Amortization of capitalized internal use software costs was $1,547 and $1,434 for the three month periods ended September 30, 2014 and 2013, respectively, and $4,573 and $4,186 for the nine month periods ended September 30, 2014 and 2013, respectively. Accumulated amortization of capitalized internal use software costs was $26,014 and $21,441 as of September 30, 2014 and December 31, 2013, respectively.

Impairment of Property and Equipment

During the three and nine month periods ended September 30, 2014, as a result of the removal of certain demand response equipment from service, the Company concluded that there were no expected future direct cash flows associated with this demand response equipment and therefore, an impairment indicator existed. The Company determined that the residual value of this demand response equipment was nominal and as a result, recorded an impairment charge during the three and nine month periods ended September 30, 2014 of $175 and $527, respectively, to reduce the carrying value of such equipment to zero.

Industry Segment Information

The Company operates in the following major geographic areas as noted in the below chart. The “All other” designation includes revenues from other international locations, primarily consisting of Brazil, Canada, China, Germany, India, Japan, Ireland, New Zealand, South Korea and the United Kingdom. Revenues are based upon customer location and internationally totaled $57,739 and $52,908 for the three month periods ended September 30, 2014 and 2013, respectively, and totaled $80,471 and $66,952 for the nine month periods ended September 30, 2014 and 2013, respectively.

Revenues by geography as a percentage of total revenues are as follows:

Three Months Ended September 30,

Nine Months Ended September 30,

2014

2013

2014

2013

United States

82

%

81

%

81

%

81

%

Australia

13

16

12

14

All other

5

3

7

5

Total

100

%

100

%

100

%

100

%

As of September 30, 2014 and December 31, 2013, the long-lived assets related to the Company’s international subsidiaries were not material to the accompanying unaudited condensed consolidated financial statements taken as a whole.

Acquisitions

Acquisitions	9 Months Ended
	Sep. 30, 2014
Business Combinations [Abstract]	'
Acquisitions	'
	2. Acquisitions
	Entech
	On April 17, 2014, the Company and two of its subsidiaries completed acquisitions of all of the outstanding stock of Entech US and Entech UK, privately-held companies headquartered in the United States and the United Kingdom, respectively, that are leading providers of global utility bill management (UBM) software, which is currently deployed in over 100 countries, including many of the world’s fastest growing economies, such as China, India, and Brazil. In connection with the acquisition of Entech US, the Company acquired Entech US’s 50% ownership in a joint venture entity in India (Entech India), which performed development and data processing services principally for Entech US. On May 9, 2014, the Company completed the acquisition of the remaining 50% ownership of Entech India. The Company collectively refers to the entities acquired as Entech. The Company believes that the combination of Entech’s software and technology, including real-time energy data, tariffs, and monthly utility bill data on the Company’s EIS platform will now enable real-time visibility and forecasting of energy costs and empower better energy management across global enterprises.
	The Company concluded that these acquisitions represented business combinations under ASC 805, Business Combinations (ASC 805) but has concluded that they did not represent material business combinations and therefore, no pro forma financial information is required. Subsequent to the acquisition dates, the Company’s results of operations include the results of operations of Entech.
	Entech US and Entech UK were not entities under common control, however, the overall acquisitions were negotiated in contemplation of acquiring all entities, including Entech India, and closing was contingent upon acquiring all entities. The Company did separately negotiate the allocation of the overall purchase price with the stockholders of each entity. The Company acquired Entech US for an aggregate purchase price of $6,796, all of which was paid in cash at closing with $60 paid to the stockholders’ consultants to settle transactional fees due to these consultants. There is no earn-out or other additional contingent purchase price arrangements related to the acquisition of Entech US. The Company acquired Entech UK for an aggregate purchase price of $3,154, all of which was paid in cash at closing with $18 paid to the stockholders’ consultants to settle the stockholders’ fees due to these consultants. There is no earn-out or other additional contingent purchase price arrangements related to the acquisition of Entech UK. However, with respect to both of the acquisitions of Entech US and Entech UK, in accordance with the stock purchase agreement, there was a post closing adjustment to the purchase price for net working capital as of the closing date. The Company determined that both Entech US and Entech UK had working capital (defined as total assets less total liabilities in the stock purchase agreement) based on the consolidated balance sheets as of the closing date of the acquisition and therefore, this adjustment was reflected as additional purchase price for Entech US and Entech UK of $1,007 and $458, respectively, which was recorded in accrued expenses and other liabilities during the three month period ended June 30, 2014. During the three month period ended September 30, 2014, the working capital adjustments were finalized and paid in the amount of $1,323 for Entech US and $73 for Entech UK.
	The Company acquired the remaining 50% ownership interest in Entech India for an aggregate purchase price of $1,201, all of which was paid in cash at closing. There were no contingent consideration arrangements or working capital adjustments.
	The total initial purchase price related to the Company’s acquisition of Entech was $12,616 and after consideration of the final working capital adjustments which were paid during the three month period ended September 30, 2014, the final purchase price was $12,547.
	Transaction costs related to this business combination have been expensed as incurred and are included in general and administrative expenses in the Company’s unaudited condensed consolidated statements of income. Transaction costs incurred related to this transaction were approximately $311.
	The Company notes that the individual business combinations of Entech US, Entech UK and Entech India did not result in negative goodwill. Because these were business combinations of related businesses that were based on acquiring all related entities, the Company is presenting the purchase price allocation on an overall combined basis.
	The components and allocation of the purchase price consist of the following approximate amounts:
	Net tangible assets acquired	$	1,208
	Customer relationships		3,900
	Non-compete agreements		1,000
	Developed technology		700
	Trade name		260
	Deferred income tax liability		(1,689	)
	Goodwill		7,168
	Total	$	12,547
	Included in net tangible assets acquired was Entech UK’s equity interest in a China joint venture accounted for under the equity method of accounting in accordance of ASC 323, Investments—Equity Method and Joint Ventures. The fair value of this asset was not material given the nominal amount of net assets in this joint venture and its ongoing activities. The Company’s portion of income from this joint venture from the date of acquisition through September 30, 2014 was not material and is included in other (expense) income, net in the accompanying condensed consolidated statements of income. As of September 30, 2014, Entech UK had a payable to this China joint venture totaling $79 which is included in accrued expenses and other current liabilities. The deferred income tax liability recorded in connection with the allocation of the purchase price relates to the book and tax basis difference related to the acquired definite-lived intangible assets for which the book amortization expense for such assets will not be deductible for tax purposes.
	Net tangible assets acquired in the acquisition of Entech primarily related to the following:
	Cash	$	530
	Accounts receivable		1,537
	Property and equipment		275
	Other assets		242
	Accounts payable		(138	)
	Accrued payroll and related expenses		(311	)
	Accrued expenses and other liabilities		(526	)
	Deferred revenues		(63	)
	Deferred tax liability		(10	)
	Other long-term liabilities		(328	)
	Total	$	1,208
	Identifiable Intangible Assets
	As part of the allocation of the purchase price, the Company determined that Entech’s separately identifiable intangible assets were its customer relationships, non-compete agreements, developed technology, and trade name. Developed technology represented internally developed software that supports utility bill management services. As of the date of acquisition, the Company determined that there was no in-process research and development as the ongoing research and development efforts were nominal and related to routine, on-going maintenance efforts.
	The Company used the income approach to value the acquired customer relationships, developed technology, non-compete agreements, and trade name definite-lived intangible assets. This approach calculates fair value by discounting the after-tax cash flows back to a present value. The baseline data for this analysis was the cash flow estimates used to price the transaction. Cash flows were forecasted for each intangible asset then discounted based on an appropriate discount rate. The discount rate applied of 16% was benchmarked with reference to the implied rate of return from the transaction model, as well as an estimate of a market-participant’s weighted average cost of capital based on the capital asset pricing model. In addition, the Company applied the market approach concepts in determining the appropriate royalty rates for developed technology and trade name definite-lived intangible assets where such royalty rates were determined based on an independent study of comparable market rates resulting in royalty rates utilized for the developed technology and trade name definite-lived intangible assets of 2.5% and 1.5%, respectively.
	In estimating the useful life of the acquired assets, the Company considered ASC 350-30-35, General Intangibles Other Than Goodwill (ASC 350-30-35), which lists the pertinent factors to be considered when estimating the useful life of an intangible asset. These factors include a review of the expected use by the combined Company of the assets acquired, the expected useful life of another asset (or group of assets) related to the acquired assets, legal, regulatory or other contractual provisions that may limit the useful life of an acquired asset or may enable the extension of the useful life of an acquired asset without substantial cost, the effects of obsolescence, demand, competition and other economic factors, and the level of maintenance expenditures required to obtain the expected future cash flows from the asset. The Company amortizes its intangible assets over their estimated useful lives using a method that is based on estimated future cash flows, as the Company believes this will approximate the pattern in which the economic benefits of the assets will be utilized, or where the Company has concluded that the cash flows were not reliably determinable, on a straight-line basis.
	The factors contributing to the recognition of goodwill were based upon the Company’s determination that several strategic and synergistic benefits are expected to be realized from the combination. None of the goodwill is expected to be currently deductible for tax purposes.
	Entelios AG
	On February 13, 2014, the Company and one of its subsidiaries completed an acquisition of all of the outstanding stock of Entelios, a privately-held company headquartered in Germany that is a leading provider of demand response in Europe. This acquisition accelerates the Company’s entry into continental Europe with Entelios’ strong team and existing relationships with leading grid operators, utilities, retailers, and commercial, institutional, and industrial customers.
	The Company concluded that this acquisition represented a business combination under ASC 805 and has also concluded that it did not represent a material business combination. Therefore, no pro forma financial information is required to be presented. Subsequent to the acquisition date, the Company’s results of operations include the results of operations of Entelios.
	The Company acquired Entelios for an aggregate purchase price, exclusive of potential contingent consideration, of $21,784 (16,000 Euros translated based on the exchange rate on the closing date of the acquisition), all of which was paid in cash. Of the consideration paid at closing, $6,884 (5,056 Euros) was paid as consideration to allow Entelios to settle its outstanding debt and related tax obligations. In addition to the amounts paid at closing, the Company may be obligated to pay additional contingent purchase price consideration related to an earn-out amount up to a maximum of $2,042 (1,500 Euros). The earn-out payment, if any, will be based on the achievement of certain minimum defined profit metrics for the years ending December 31, 2014 and 2015, respectively. Of the $2,042 (1,500 Euros) maximum earn-out payment, up to $817 (600 Euros) and $1,225 (900 Euros) relate to the achievement of the defined profit metrics for the years ending December 31, 2014 and 2015, respectively. If the minimum defined profit metrics are not achieved, there will be no partial payment, however, the amount of the earn-out payment can vary based on the amount that profits exceed the minimum defined profit metrics. The Company determined that the initial fair value of the earn-out payment as of the acquisition date was $95. This fair value was included as a component of the purchase price resulting in an aggregate purchase price of $21,879. Any changes in fair value will be recorded in the Company’s consolidated statements of income. The Company recorded its estimate of the fair value of the contingent consideration based on the evaluation of the likelihood of the achievement of the contractual conditions that would result in the payment of the contingent consideration and weighted probability assumptions of these outcomes. This fair value measurement was determined utilizing a Monte Carlo simulation and was based on significant inputs not observable in the market and therefore, represented a Level 3 measurement as defined in ASC 820, Fair Value Measurements and Disclosures (ASC 820). Through September 30, 2014, there were no changes in the probability of the earn-out payment. This liability has been discounted to reflect the time value of money and therefore, as the milestone date approaches, the fair value of this liability will increase. This increase in fair value will be recorded to cost of revenues in the Company’s consolidated statements of income. During the three and nine month periods ended September 30, 2014, the change in fair value due to the accretion of the time value of money discount was not material. At September 30, 2014, the liability was recorded at $102 after adjusting for changes in exchange rates.
	Transaction costs related to this business combination have been expensed as incurred and are included in general and administrative expenses in the Company’s unaudited condensed consolidated statements of income. Transaction costs incurred related to this transaction were approximately $511.
	The components and allocation of the purchase price consist of the following approximate amounts:
	Net tangible liabilities assumed as of February 13, 2014	$	(50	)
	Customer relationships		4,084
	Non-compete agreements		204
	Developed technology		1,770
	Trade name		218
	Deferred income tax asset		2,070
	Deferred income tax liability		(2,070	)
	Goodwill		15,653
	Total	$	21,879
	The deferred income tax liability recorded in connection with the allocation of purchase price relates to the book and tax basis difference related to the acquired definite-lived intangible assets for which the book amortization expense for such assets will not be deductible for tax purposes. Due to the fact that this deferred income tax liability represents a potential source of income as defined in ASC 740, Income Taxes (ASC 740), the Company determined that it was more likely than not that a portion of the deferred tax assets acquired in the business combination, which relate to tax net operating loss carry forwards, were realizable. As a result, the Company recorded a corresponding deferred income tax asset that would be utilized to offset this potential source of taxable income. As the deferred income tax liability and deferred income tax asset are both long-term and relate to the same jurisdiction, these amounts are netted in the Company’s unaudited condensed consolidated balance sheet.
	Net tangible liabilities assumed in the acquisition of Entelios primarily related to the following:
	Cash	$	1,564
	Accounts receivable		19
	Capitalized incremental direct customer contract costs		36
	Prepaid expenses and other current assets		148
	Property and equipment		377
	Other assets		72
	Accounts payable		(178	)
	Accrued payroll and related expenses		(970	)
	Accrued expenses and other liabilities		(1,098	)
	Deferred revenues		(20	)
Total	$	(50	)
Identifiable Intangible Assets
As part of the allocation of the purchase price, the Company determined that Entelios’s separately identifiable intangible assets were its customer relationships, non-compete agreements, developed technology, and trade name. Developed technology represented internally developed software that supports the management of demand response dispatches, including fast-response dispatches, as well as, assists with the performance calculations and related settlements. As of the date of acquisition, the Company determined that there was no in-process research and development as the ongoing research and development efforts were nominal and related to routine, on-going maintenance efforts.
The Company used the income approach to value the acquired customer relationships, non-compete agreements, and trade name definite-lived intangible assets. This approach calculates fair value by discounting the after-tax cash flows back to a present value. The baseline data for this analysis was the cash flow estimates used to price the transaction. Cash flows were forecasted for each intangible asset then discounted based on an appropriate discount rate. The discount rates applied, which ranged between 12% and 17%, were benchmarked with reference to the implied rate of return from the transaction model, as well as an estimate of a market-participant’s weighted average cost of capital based on the capital asset pricing model.
The Company used the cost approach to value the acquired developed technology definite-lived intangible asset, as the Company determined that a market participant would be expected to have similar offerings and capabilities to build a replacement version of the software. Furthermore, it is expected that the software will be migrated over time or potentially replaced by the Company’s existing software platform and this expectation is consistent with that of a market participant. The cost approach determines fair value by calculating the reproduction cost of an exact replica of the subject intangible asset. The Company calculated the replacement cost based on the estimated hours and costs incurred to develop.
In estimating the useful life of the acquired assets, the Company considered ASC 350-30-35, which lists the pertinent factors to be considered when estimating the useful life of an intangible asset. These factors include a review of the expected use by the combined Company of the assets acquired, the expected useful life of another asset (or group of assets) related to the acquired assets, legal, regulatory or other contractual provisions that may limit the useful life of an acquired asset or may enable the extension of the useful life of an acquired asset without substantial cost, the effects of obsolescence, demand, competition and other economic factors, and the level of maintenance expenditures required to obtain the expected future cash flows from the asset. The Company amortizes its intangible assets over their estimated useful lives using a method that is based on estimated future cash flows, as the Company believes this will approximate the pattern in which the economic benefits of the assets will be utilized, or where the Company has concluded that the cash flows were not reliably determinable, on a straight-line basis.
The factors contributing to the recognition of goodwill were based upon the Company’s determination that several strategic and synergistic benefits are expected to be realized from the combination. None of the goodwill is expected to be currently deductible for tax purposes.
Activation Energy DSU Limited
On February 13, 2014, the Company and one of its subsidiaries completed an acquisition of all of the outstanding stock of Activation, a privately-held company headquartered in Ireland that is the leading provider of demand response software and services in Ireland. This acquisition gives the Company an immediate presence in the Irish capacity market and further strengthens the Company’s ability to deliver its full suite of EIS and related solutions throughout Europe.
The Company concluded that this acquisition represented a business combination under ASC 805 and has also concluded that it did not represent a material business combination and therefore, no pro forma financial information is required to be presented. Subsequent to the acquisition date, the Company’s results of operations include the results of operations of Activation.
The Company acquired Activation for an aggregate purchase price of $3,844 (2,823 Euros translated based on the exchange rate on the date of the acquisition close), plus an additional $732 (538 Euros) paid as working capital and other adjustments, all of which was paid in cash. In addition to the amounts paid at closing, the Company may be obligated to pay additional contingent purchase price consideration related to an earn-out amount up to a maximum of $1,398 (1,027 Euros). The earn-out payment, if any, will be based on the achievement of certain minimum defined MW enrollment, as well as, profit metrics for the years ending December 31, 2014 and 2015, respectively. Of the maximum earn-out payment, up to $350 (257 Euros) and $1,048 (770 Euros) relate to the achievement of the defined profit metrics for the years ending December 31, 2014 and 2015, respectively. If the minimum defined profit metrics are not achieved, there will be no partial payment, however, the amount of the earn-out payment can vary based on the amount that profits exceed the minimum defined profit metrics. The Company determined that the initial fair value of the earn-out payment as of the acquisition date was $300. This fair value was included as a component of the purchase price resulting in an aggregate purchase price of $4,876. Any changes in fair value will be recorded in the Company’s consolidated statements of income. The Company recorded its estimate of the fair value of the contingent consideration based on the evaluation of the likelihood of the achievement of the contractual conditions that would result in the payment of the contingent consideration and weighted probability assumptions of these outcomes. This fair value measurement was determined utilizing a Monte Carlo simulation and was based on significant inputs not observable in the market and therefore, represented a Level 3 measurement as defined in ASC 820. During the three month period ended September 30, 2014, the Company concluded based on the operating results through September 30, 2014 that there was an increase in the probability of achievement of the earn-out payment related to the year ending December 31, 2014. As a result, the Company determined that the fair value of this earn-out payment had increased utilizing a Monte Carlo simulation and based on significant inputs not observable in the market and therefore, represented a Level 3 measurement as defined in ASC 820, resulting an additional expense to cost of revenues in the Company’s unaudited condensed consolidated statements of income during the three month period ended September 30, 2014 of $127 (100 Euros). This amount represents the cumulative catch up of accretion expense for the portion of the earn-out period that had lapsed through September 30, 2014. This liability has been discounted to reflect the time value of money and therefore, as the milestone date approaches, the fair value of this liability will increase. During the three and nine month periods ended September 30, 2014, the change in fair value due to the accretion of the time value of money discount was not material. At September 30, 2014, the liability was recorded at $451 after adjusting for changes in exchange rates.
As a result of gathering information to update the Company’s valuation allocation during the three month period ended June 30, 2014, the Company determined that the estimated purchase price paid at the closing exceeded the final purchase price. The Company and the former stockholders of Activation reached an agreement to reduce the purchase price by $15 and this amount was released from escrow back to the Company prior to June 30, 2014. This reduction in purchase price reduced the goodwill acquired.
Transaction costs related to this business combination have been expensed as incurred and are included in general and administrative expenses in the Company’s unaudited condensed consolidated statements of income. Transaction costs incurred related to this transaction were approximately $159.
The components and allocation of the purchase price consist of the following approximate amounts:
Net tangible assets acquired as of February 13, 2014	$	752
Customer relationships		2,042
Non-compete agreements		220
Developed technology		545
Trade name		82
Deferred income tax liability		(361	)
Goodwill		1,581
Total	$	4,861
The deferred income tax liability recorded in connection with the allocation of the purchase price relates to the book and tax basis difference related to the acquired definite-lived intangible assets where the book amortization expense for such assets will not be deductible for tax purposes.
Net tangible assets acquired in the acquisition of Activation primarily related to the following:
Cash	$	711
Accounts receivable		472
Prepaid expenses and other current assets		27
Property and equipment		92
Accounts payable		(45	)
Accrued expenses and other current liabilities		(55	)
Accrued capacity payments		(450	)
Total	$	752
Identifiable Intangible Assets
As part of the allocation of the purchase price, the Company determined that Activation’s separately identifiable intangible assets were its customer relationships, non-compete agreements, developed technology, and trade name. Developed technology represented internally developed software that facilitates customer transactions and provides analytical capabilities. As of the date of acquisition, the Company determined that there was no in-process research and development as the ongoing research and development efforts were nominal and related to routine, on-going maintenance efforts.
The Company used the income approach to value the acquired customer relationships, non-compete agreements, and trade name definite-lived intangible assets. This approach calculates fair value by discounting the after-tax cash flows back to a present value. The baseline data for this analysis was the cash flow estimates used to price the transaction. Cash flows were forecasted for each intangible asset then discounted based on an appropriate discount rate. The discount rates applied, which ranged between 17% and 20%, were benchmarked with reference to the implied rate of return from the transaction model, as well as an estimate of a market-participant’s weighted average cost of capital based on the capital asset pricing model.
The Company used the cost approach to value the acquired developed technology definite-lived intangible asset, as the Company determined that a market participant would be expected to have similar offerings and capabilities to build a replacement version of the software. Furthermore, it is expected that the software will be migrated over time or potentially replaced by the Company’s existing software platform and this expectation is consistent with that of a market participant. The cost approach determines fair value by calculating the reproduction cost of an exact replica of the subject intangible asset. The Company calculated the replacement cost based on the estimated hours and costs incurred to develop.
In estimating the useful life of the acquired assets, the Company considered ASC 350-30-35, which lists the pertinent factors to be considered when estimating the useful life of an intangible asset. These factors include a review of the expected use by the combined Company of the assets acquired, the expected useful life of another asset (or group of assets) related to the acquired assets, legal, regulatory or other contractual provisions that may limit the useful life of an acquired asset or may enable the extension of the useful life of an acquired asset without substantial cost, the effects of obsolescence, demand, competition and other economic factors, and the level of maintenance expenditures required to obtain the expected future cash flows from the asset. The Company amortizes its intangible assets over their estimated useful lives using a method that is based on estimated future cash flows, as the Company believes this will approximate the pattern in which the economic benefits of the assets will be utilized, or where the Company has concluded that the cash flows were not reliably determinable, on a straight-line basis.
The factors contributing to the recognition of goodwill were based upon the Company’s determination that several strategic and synergistic benefits are expected to be realized from the combination. None of the goodwill is expected to be currently deductible for tax purposes.
Other Immaterial Acquisition
On April 2, 2014, one of the Company’s subsidiaries completed the acquisition of all of the outstanding stock of a privately-held company headquartered in a foreign market that provides demand response software and services in that market. The Company concluded that this acquisition represented a business combination and, therefore, has accounted for it as such. The Company believes that this acquisition gives it an immediate presence in this market and further strengthens its ability to deliver its full suite of EIS and related solutions throughout the region.
The Company concluded that this acquisition represented a business combination under ASC No. 805 but also concluded that it did not represent a material business combination and therefore, no pro forma financial information is required.
The Company acquired this entity for an aggregate initial purchase price of $250, plus an additional $470 paid as working capital and other adjustments, all of which was paid in cash. Of the initial purchase price, $125 was retained by the Company as deferred acquisition consideration to cover general business representations and warranties. This amount will be paid 18 months after the closing date.
In addition to the amounts paid at closing, the Company may be obligated to pay additional contingent purchase price consideration related to certain earn-out amounts up to a maximum of $1,750. The earn-out payments, if any, will be based on the achievement of certain defined market legislation and certain operational metrics. With respect to a potential earn-out payment based on defined market legislation of $250, the Company concluded that this was probable of achievement and determined that the fair value as of the acquisition date of $175 represented a component of purchase price. The defined market legislation was finalized in May 2014 and the earn-out payment was deemed achieved. Therefore, the Company recorded an accretion expense between the initial fair value as of the date of acquisition and payment amount totaling $75 during the three month period ended June 30, 2014. The Company paid 50% of this earn-out payment during the three month period ended June 30, 2014 and the remaining 50% has been retained by the Company as deferred acquisition consideration to cover general business representations and warranties. This amount will be paid 18 months after the closing date. Because the remaining $1,500 of earn-out payments are only payable to those stockholders of the acquired entity who are employees as of the time of achievement, the Company has concluded that these earn-out payments should be accounted for as compensation arrangements and not as a component of purchase price. The Company will evaluate the probability of achievement and record expense ratably over the applicable estimated service period as compensation expense for the amount, if any, deemed probable of achievement. Beginning with the three month period ended of June 30, 2014, the Company concluded that $500 of the potential $1,500 of earn-out payments were probable of achievement and is recording this amount ratably over the estimated service period. During the three month and nine month periods ended September 30, 2014, the Company recorded $66 and $137 of expense, respectively, related to this probable earn-out payment.
Based on information that existed as of the closing date, the working capital adjustment was reduced by $6. Therefore, the final purchase price was determined to be $889. Based on the Company’s evaluation of the assets and liabilities acquired, the Company determined that there were no separately identifiable intangible assets and as a result, $476 was ascribed to the fair value of net tangible assets acquired with the remaining $413 being recorded to goodwill.
The Company’s consolidated financial statements will reflect the results of operations of this acquired entity from April 2, 2014 forward.
The factors contributing to the recognition of goodwill were based upon the Company’s determination that several strategic and synergistic benefits are expected to be realized from the combination. None of the goodwill is expected to be currently deductible for tax purposes.

Japan_Joint_Venture

Japan Joint Venture	9 Months Ended
	Sep. 30, 2014
Text Block [Abstract]	'
Japan Joint Venture	'
	3. Japan Joint Venture
	On December 10, 2013, the Company entered into a joint venture with Marubeni Corporation to provide demand response applications and solutions in Japan. The new company was formed in January 2014 and named EnerNOC Japan K.K., which will have an exclusive license to market the Company’s demand response SaaS solution throughout Japan. The Company and Marubeni Corporation contributed initial capital funding in the form of common stock totaling $580 and $392, respectively. The Company is the majority-owner and owns 60% of EnerNOC Japan K.K. The Company has evaluated its accounting for its ownership interest in EnerNOC Japan K.K. in accordance with ASC 810, Consolidation (ASC 810) and has concluded that it is required to consolidate this entity. As a result, the Company has consolidated the results of this entity, which commenced during the three month period ended March 31, 2014. During the three and nine month periods ended September 30, 2014, the revenues and pre-tax loss derived from EnerNOC Japan K.K. were not material to the Company’s consolidated results of operations.

Investments

Investments	9 Months Ended
	Sep. 30, 2014
Investments, Debt and Equity Securities [Abstract]	'
Investments	'
	4. Investments
	Equity Investment and License
	In February 2014, the Company purchased Series A Preferred Stock (preferred stock) in a privately-held company that licenses its developed software technology for managing electricity tariff rates and related subject matters to allow third parties a central repository to obtain this information and to convert energy usage data into financial costs and savings for a purchase price of $1,000. Based on other recent financings completed by this privately-held company, the Company concluded that the $1,000 represented the fair value of its investment. The Company notes that its preferred stock investment has a substantive liquidation preference and therefore, does not represent in-substance common stock. As a result, the Company concluded that such investment should be accounted for as a cost method investment under ASC 325-20, Cost Method Investments (ASC 325-20). Under ASC 325-20, cost method investments are recorded as long-term assets initially at historical cost and are assessed for other-than-temporary impairments under the provisions of ASC 320, Investments – Debt and Equity Securities (ASC 320), and are adjusted accordingly. Based on the Company’s assessment as of September 30, 2014, the Company did not identify any other-than-temporary impairment indicators. Since the inputs utilized for the Company’s periodic impairment assessment are not based on observable market data, this cost method investment is classified within Level 3 of the fair value hierarchy. To determine the fair value of this investment, the Company utilized available financial information related to the entity, including information based on recent or pending third-party equity investments in this entity. A cost method investment’s fair value is not estimated as there are no identified events or changes in circumstances that may have a significant adverse effect on the fair value of the investment and to do so would be impractical.
	In addition to the above equity investment, the Company also entered into a license agreement to obtain a perpetual license to the developed software technology and other rights for $2,000. In accordance with the terms of the license agreement, the Company has a perpetual license to the developed software technology, including any future updates and enhancements, as well as, in certain instances the right to acquire ownership of the technology. The Company concluded that the $2,000 represents the fair value of the license obtained and has capitalized this amount as a component of property and equipment in its unaudited condensed consolidated balance sheets. The Company is depreciating this asset over its estimated useful life of three years with depreciation expense being recorded as a component of cost of revenues. For the three and nine month periods ended September 30, 2014, the Company recorded depreciation expense of $166 and $444, respectively. The Company also has the ability to earn a royalty up to a maximum of $2,000 of certain future revenues that may be generated from the licensing of the developed software technology. The Company concluded that these potential royalties represent a potential contingent income stream and will record such royalties, if any, as a component of other (expense) income, net in its unaudited condensed consolidated statements of income upon cash receipt. Through September 30, 2014, the Company had not received any significant royalty payments.
	Convertible Promissory Note Investment and Partnering Agreement
	In August 2014, the Company purchased a convertible promissory note for a purchase price of $1,500 in a privately-held software-as-a-service (SaaS) company (WeSpire) that serves businesses seeking an innovative approach to measure and track the positive business impact of engaging employees in sustainability through technology. The convertible promissory note bears interest at 5% per annum and matures on December 31, 2015 unless previously converted. The note is convertible into preferred stock automatically upon a qualified financing, as defined in the convertible promissory note, or at the Company’s option at maturity or upon the occurrence of a specified transaction. Based on other recent financings completed by WeSpire, the Company concluded that the $1,500 represented the fair value of its investment.
	The Company notes that its convertible promissory note investment is payable in cash at maturity and has a substantive liquidation preference upon conversion and therefore, does not represent in-substance common stock. As a result, the Company concluded that such investment should be accounted for as an available-for-sale investment under ASC 320. Under ASC 320, debt and equity securities classified as available-for-sale are reported at fair value with unrealized gains or losses excluded from earnings and reported as a separate component of stockholders’ equity in other comprehensive income. Available-for-sale investments are assessed for other-than-temporary impairments under the provisions of ASC 320 and are adjusted accordingly. Based on the Company’s assessment as of September 30, 2014, it did not identify any other-than-temporary impairment indicators. Since the inputs utilized for the Company’s periodic impairment assessment are not based on observable market data, this available-for-sale investment is classified within Level 3 of the fair value hierarchy. To determine the fair value of this investment, the Company utilized available financial information related to the entity, including information based on recent or pending third-party equity investments in this entity. At September 30, 2014, the amortized cost and estimated fair value were $1,500 and $1,500, respectively. The Company has considered whether there are any features that would require bifurcation under ASC 815 and has concluded that there were no features requiring bifurcation.
	As part of this investment, the Company also entered into a partnering agreement with WeSpire whereby it received the exclusive right to market, promote and sell certain products of WeSpire throughout the world. The Company will make fixed quarterly exclusivity payments, subject to adjustment based on defined revenue thresholds related to this exclusive right. The Company considered whether there are any guaranteed minimum payment obligations that may require straight line recognition of the payments over the term of the agreement, noting none and also considered whether there are any ongoing obligations under the partnering agreement, which may require the deferral of a portion of the consideration received under the arrangement, noting none. Additionally, the Company will receive reseller fees based on defined revenue thresholds. The Company has concluded that the reseller fees and the exclusivity payments will be recorded as a component of other (expense) income, net in its consolidated statements of income.
	Through September 30, 2014, the Company has not recorded any expense associated with this partnering agreement.

Intangible_Assets_and_Goodwill

Intangible Assets and Goodwill	9 Months Ended
	Sep. 30, 2014
Goodwill and Intangible Assets Disclosure [Abstract]	'
Intangible Assets and Goodwill	'
	5. Intangible Assets and Goodwill
	Definite-Lived Intangible Assets
	The following table provides the gross carrying amount and related accumulated amortization of intangible assets as of September 30, 2014 and December 31, 2013:
					As of September 30, 2014					As of December 31, 2013
		Weighted Average			Gross					Gross
		Amortization			Carrying		Accumulated			Carrying		Accumulated
		Period (in years)			Amount		Amortization			Amount		Amortization
	Customer relationships		3.63		$	37,908	$	(18,608	)	$	29,663	$	(15,416	)
	Customer contracts		2.37		$	4,953	$	(3,483	)	$	4,887	$	(2,900	)
	Employment agreements and non-compete agreements		1.22			2,650		(1,669	)		1,676		(1,475	)
	Software		—			120		(120	)		120		(120	)
	Developed Technology		1.44			5,393		(2,889	)		2,277		(1,758	)
	Trade name		0.79			1,100		(687	)		575		(455	)
	Patents		5.39			180		(81	)		180		(68	)
	Total other definite-lived intangible assets					14,396		(8,929	)		9,715		(6,776	)
	Total				$	52,304	$	(27,537	)	$	39,378	$	(22,192	)
	The increase in the gross carrying amount of definite-lived intangible assets from December 31, 2013 to September 30, 2014 was primarily due to definite-lived intangible assets acquired in connection with the Company’s acquisitions of Entelios, Activation and Entech. In addition, the increase in the gross carrying amount of the definite-lived customer contract intangible assets was due to the acquisition of certain C&I contractual arrangements acquired during the three month period ended March 31, 2014 for a purchase price of $403 to help fulfill the Company’s contractual obligations and overall performance requirements in connection with one of its bilateral demand response arrangements with an utility. The acquisition of this intangible asset did not meet the definition of a business, as defined in ASC 805, due to the fact that neither processes nor the additional inputs required to combine with this intangible asset in order to be capable of producing outputs were acquired. Therefore, the acquisition of this intangible asset was accounted for as an asset acquisition based on the principles described in ASC 805-50, and as there was only a single asset acquired, the entire purchase price was allocated to this single intangible asset. Based on the evaluation of the expected direct cash flows to be received from this acquired intangible asset, the Company determined that the cost exceeded the fair value and as a result, recorded an impairment charge of $323 during the nine month period ended September 30, 2014, respectively. As of September 30, 2014, the carrying value of this asset had been reduced to zero.
	Amortization expense related to intangible assets amounted to $2,391 and $1,703 for the three month periods ended September 30, 2014 and 2013, respectively, and $6,753 and $5,260 for the nine month periods ended September 30, 2014 and 2013, respectively. Amortization expense for developed technology, which was $515 and $138 for the three month periods ended September 30, 2014 and 2013, respectively, and $1,482 and $416 for the nine month periods ended September 30, 2014 and 2013, respectively, is included in cost of revenues in the accompanying unaudited condensed consolidated statements of income. Amortization expense for all other intangible assets is included as a component of operating expenses in the accompanying unaudited condensed consolidated statements of income. The intangible asset lives range from one to ten years and the weighted average remaining life was 3.1 years at September 30, 2014. Estimated amortization is expected to be $2,281, $7,459, $5,666, $3,952, $1,568 and $3,841for the three month period ending December 31, 2014, and years ending 2015, 2016, 2017, 2018 and thereafter, respectively.
	Goodwill
	In accordance with ASC 350, Intangibles—Goodwill and Other (ASC 350), the Company tests goodwill at the reporting unit level for impairment on an annual basis and between annual tests if events and circumstances indicate it is more likely than not that the fair value of a reporting unit is less than its carrying value. The Company’s annual impairment test date is November 30 (Impairment Test Date). During the three month period ended September 30, 2014, there were no potential impairment indicators identified that required an interim impairment test of goodwill. The Company’s market capitalization as of September 30, 2014 exceeded the book value of its consolidated net assets by more than 100%. In addition, as of November 30, 2013 (last Impairment Test Date), the fair value of both the Company’s consolidated Australian reporting unit and the Company’s all other operations reporting unit exceeded each of their respective carrying values by more than 50%.
	The following table shows the change of the carrying amount of goodwill from December 31, 2013 to September 30, 2014:
	Balance at December 31, 2013	$	77,104
	Acquisitions		24,815
	Foreign currency translation		(1,492	)
	Balance at September 30, 2014	$	100,427

Net_Income_Per_Share

Net Income Per Share	9 Months Ended
	Sep. 30, 2014
Earnings Per Share [Abstract]	'
Net Income Per Share	'
	6. Net Income Per Share
	ASC 260, Earnings Per Share (ASC 260), provides guidance on the computation, presentation and disclosure guidance for earnings per share. In particular, ASC 260-10-45-40 provides guidance on the earnings-per-share (EPS) ramifications of convertible securities. The Company concluded that it is required to separate the conversion feature embedded in the convertible notes issued in August 2014 (see Note 9 for further discussion) upon issuance, even though its ability to settle conversion requests in shares, cash or a combination of shares and cash is contingent on shareholder approval. The Company has determined the impact of the convertible notes on diluted EPS using the “if-converted” method until when and if the shareholders approve its request to settle other than by physical settlement. Under the “if-converted” method:
		•		The Company (1) adds back interest expense recognized on the convertible debt to income available to common shareholders, (2) adjusts income available to common shareholders to the extent nondiscretionary adjustments based on income made during the period would have been computed differently had the interest on convertible debt never been recognized (e.g., expense associated with a profit sharing plan or a royalty agreement), and (3) adjusts income available to common shareholders for the income tax effect, if any, of (1) and (2).
		•		The convertible debt is assumed to have been converted at the beginning of the period (or at time of issuance, if later), and the resulting common shares is included in the number of shares outstanding.
	In applying the “if-converted” method, conversion is not assumed for purposes of computing diluted EPS if the effect will be anti-dilutive.
	When and if shareholder approval is obtained, the Company will subsequently determine the impact of the convertible notes on diluted EPS in a manner consistent with the accounting for Instrument X (i.e., the Treasury Stock Method as described in ASC 260-45-23). Instrument X presumes share settlement for diluted EPS purposes; however, the presumption that the contract will settle in common stock may be overcome if the entity controls the means of settlement and past experience or a stated policy provides a reasonable basis to believe that the contract will be partially or wholly settled in cash.
	A reconciliation of net income attributable to EnerNOC, Inc. to the adjusted net income attributable to EnerNOC, Inc. utilized in the calculation of net income per share in accordance with the “if-converted” method outlined above is as follows (amounts in thousands):
			Three Months Ended				Nine Months Ended
			September 30,		September 30,		September 30,		September 30,
			2014		2013		2014		2013
	Net income attributable to EnerNOC, Inc.		$	96,673	$	106,857	$	38,875	$	41,969
	ADD: Interest expense related to convertible notes			980		—		980		—
	Adjusted net income attributable to EnerNOC, Inc.		$	97,653	$	106,857	$	39,855	$	41,969
	A reconciliation of basic and diluted share amounts for the three and nine month periods ended September 30, 2014 and 2013 are as follows (shares in thousands):
			Three Months Ended				Nine Months Ended
			September 30,				September 30,
			2014		2013		2014		2013
	Basic weighted average common shares outstanding			27,795		27,920		28,075		27,693
	Weighted average common stock equivalents			877		923		1,068		924
	Incremental shares from assumed conversion of convertible notes			2,762		—		931		—
	Diluted weighted average common shares outstanding			31,434		28,843		30,074		28,617
	Weighted average anti-dilutive shares related to:
	Stock options			2		—		5		1
	Nonvested restricted shares			92		54		384		336
	Restricted stock units			7		—		10		9
	In reporting periods in which the Company reports net income, anti-dilutive shares consist of the impact of those number of shares that would have been dilutive had the Company had net income plus the number of common stock equivalents that would have been anti-dilutive had the Company had net income. In those reporting periods in which the Company reports net income, anti-dilutive shares consist of those common stock equivalents that have either an exercise price above the average stock price for the period or the common stock equivalents’ related average unrecognized stock compensation expense is sufficient to “buy back” the entire amount of shares.
	The Company excludes the shares issued in connection with restricted stock awards from the calculation of basic weighted average common shares outstanding until such time as those shares vest. In addition, with respect to restricted stock awards and restricted stock units that vest based on achievement of performance conditions, because performance conditions are considered contingencies under ASC 260, the criteria for contingent shares must first be applied before determining the dilutive effect of these types of share-based payments. Prior to the end of the contingency period (i.e., before the performance conditions have been satisfied), the number of contingently issuable common shares to be included in diluted weighted average common shares outstanding should be based on the number of common shares, if any, that would be issuable under the terms of the arrangement if the end of the reporting period were the end of the contingency period (e.g., the number of shares that would be issuable based on current performance criteria) assuming the result would be dilutive.
	In connection with certain of the Company’s business combinations, the Company issued common shares that were held in escrow upon closing of the applicable business combination. The Company excludes shares held in escrow from the calculation of basic weighted average common shares outstanding where the release of such shares is contingent upon an event and not solely subject to the passage of time. As of September 30, 2014, the Company had no shares of common stock held in escrow.
	The 254,654 shares related to a component of the deferred purchase price consideration from the acquisition of M2M Communications Corporation (M2M), which are not subject to adjustment as the issuance of such shares is not subject to any contingency, are included in both the basic and diluted weighted average common shares outstanding amounts.

Disclosure_of_Fair_Value_of_Fi

Disclosure of Fair Value of Financial Instruments	9 Months Ended
	Sep. 30, 2014
Fair Value Disclosures [Abstract]	'
Disclosure of Fair Value of Financial Instruments	'
	7. Disclosure of Fair Value of Financial Instruments
	The Company’s financial instruments mainly consist of cash and cash equivalents, restricted cash, cost method and available-for-sale investments, accounts receivable, accounts payable, and convertible debt obligations. The carrying amounts of the Company’s cash equivalents, restricted cash, accounts receivable and accounts payable approximate their fair value due to the short-term nature of these instruments. The Company has $160,000 of convertible debt outstanding (See Note 9) as of September 30, 2014. The fair value of this convertible debt was approximately $137,907 as of September 30, 2014 based on the trading prices of the underlying convertible notes as of that date. As of December 31, 2013, the Company had no debt obligations outstanding.

Fair_Value_Measurements

Fair Value Measurements	9 Months Ended
	Sep. 30, 2014
Fair Value Disclosures [Abstract]	'
Fair Value Measurements	'
	8. Fair Value Measurements
	The tables below present the balances of assets and liabilities measured at fair value on a recurring basis at September 30, 2014 and December 31, 2013:
			Fair Value Measurement at September 30, 2014 Using
					Quoted Prices in		Significant
					Active Markets		Other
					for Identical		Observable		Unobservable
			Totals		Assets (Level 1)		Inputs (Level 2)		Inputs (Level 3)
	Assets:
	Money market funds (1)		$	220,051	$	220,051	$	—	$	—
	Available for sale convertible debt instrument (2)		$	1,500	$	—	$	—	$	1,500
	Liabilities:
	Accrued contingent purchase price consideration (3)		$	553	$	—	$	—	$	553
	Deferred acquisition consideration (3)		$	832	$	—	$	—	$	832
	-1	Total of $219,871 included in cash and cash equivalents and $180 included in restricted cash in the accompanying unaudited condensed consolidated balance sheets and represents the only asset that the Company measures and records at fair value on a recurring basis. These money market funds represent excess operating cash that is invested daily into an overnight investment account. The decrease from December 31, 2013 was primarily due to cash used in operations and cash utilized for the Company’s acquisitions during the nine month period ended September 30, 2014.
	-2	Represents convertible debt investment in privately-held entity (refer to Note 4). Based on assessment of the financial information, including historical and forecasted results, of the privately-held entity, as well as, additional qualitative information, the Company has determined that there have been no changes in fair value of this investment.
	-3	Accrued contingent purchase price consideration, which resulted from the Company’s acquisitions of Entelios and Activation in February 2014, and deferred acquisition consideration, which resulted from the Company’s other immaterial acquisition completed in April 2014 and the Company’s acquisition of M2M in January 2011, the Company measures and records at fair value on a recurring basis using significant unobservable inputs (Level 3). The aggregate increase in fair value of liabilities for the nine month period ended September 30, 2014 was due to the increase in the liabilities as a result of a change in the fair value of the amortization of the applicable discounts related to the time value of money of $89 and changes in exchange rates. In addition, as a result of a change in probability of certain earn-outs related to the Company’s acquisition of Activation and of the Company’s other immaterial acquisition, there was an increase in fair value of these earn-outs of $202 recorded during the nine month period ended September 30, 2014. Refer to Note 2 for further discussion. There were no other changes to the probability or timing of payment during the nine month period ended September 30, 2014.
	With respect to assets measured at fair value on a non-recurring basis, these represent impaired long-lived assets (refer to Note 1 for discussion of the determination of fair value of these assets), impaired definite-lived intangible assets (refer to Note 2 for discussion of the determination of fair value of these assets) and cost method investments (refer to Note 4 for discussion of the determination of fair value of these assets).
	The table below presents the balances of assets and liabilities measured at fair value on a recurring basis at December 31, 2013:
			Fair Value Measurement at December 31, 2013 Using
					Quoted Prices in		Significant
					Active Markets		Other
					for Identical		Observable		Unobservable
			Totals		Assets (Level 1)		Inputs (Level 2)		Inputs (Level 3)
	Assets:
	Money market funds (1)		$	146,626	$	146,626	$	—	$	—
	Liabilities:
	Deferred acquisition consideration (2)		$	566	$	—	$	—	$	566
	-1	Total of $145,076 included in cash and cash equivalents and $1,550 included in restricted cash in the accompanying unaudited condensed consolidated balance sheets and represents the only assets that the Company measures and records at fair value on a recurring basis. These money market funds represent excess operating cash that is invested daily into an overnight investment account.
	-2	Deferred acquisition consideration which is a liability and was the result of the Company’s acquisition of M2M represents the only liability that the Company measures and records at fair value on a recurring basis using significant unobservable inputs (Level 3). The aggregate increase in fair value of this liability for the year ended December 31, 2013 of $33 was due to the increase in the liability as a result of the amortization of the discount related to the time value of money. There were no changes with respect to the timing of payment subsequent to December 31, 2013.

Borrowings_and_Credit_Arrangem

Borrowings and Credit Arrangements	9 Months Ended
	Sep. 30, 2014
Debt Disclosure [Abstract]	'
Borrowings and Credit Arrangements	'
	9. Borrowings and Credit Arrangements
	Convertible Notes
	On August 12, 2014, the Company entered into a purchase agreement with Morgan Stanley & Co. LLC, acting on behalf of itself and the several initial purchasers, relating to the Company’s sale of $160,000 aggregate principal amount of 2.25% convertible senior notes due 2019 (the Notes) in an offering exempt from registration under the Securities Act of 1933, as amended (the Offering).
	On August 18, 2014, the Offering closed and the Company issued the Notes. The net proceeds from the offering was approximately $155,278, after deducting the underwriters’ discounts of $4,000 and offering expenses of approximately $722 payable by the Company. The Company used $30,000 of the net proceeds of the offering to repurchase 1,514,552 shares of its common stock from purchasers of the Notes in privately negotiated transactions effected through Morgan Stanley & Co. LLC, as the Company’s agent, at a purchase price of $19.79 per share, which was the closing price of the Common Stock on The NASDAQ Global Select Market on August 12, 2014.
	The Notes are the Company’s senior unsecured obligations and rank equally with all of the Company’s future senior unsecured debt and prior to all future subordinated debt. The Notes are effectively subordinated to any future secured indebtedness to the extent of the collateral securing such indebtedness, and structurally subordinated to all indebtedness and other liabilities (including trade payables) of the Company’s subsidiaries. Interest on the Notes will be payable semi-annually in cash in arrears on February 15 and August 15 of each year, beginning on February 15, 2015, at a rate of 2.25% per year. The Notes will mature on August 15, 2019 unless earlier converted or repurchased.
	The Notes were issued pursuant to an indenture, dated as of August 18, 2014 (the Indenture), between the Company and Wells Fargo Bank, National Association, as trustee. The Notes are convertible at an initial conversion rate of 36.0933 shares of the common stock per $1,000 principal amount of Notes (equivalent to an initial conversion price of approximately $27.71 per share of Common Stock). Initially, upon conversion, the Company will deliver for each $1,000 principal amount of converted Notes a number of shares of common stock equal to the conversion rate. However, if the Company receives stockholder approval, the Company may settle conversions of Notes by paying or delivering, as the case may be, cash, shares of common stock or a combination of cash and shares of common stock, at its election. The conversion rate will be subject to adjustment in some events, but will not be adjusted for any accrued and unpaid interest. Following the occurrence of certain events, the Company will increase the conversion rate for a holder who elects to convert its Notes by a pre-determined factor in connection with those certain events.
	Prior to February 15, 2019, holders may convert all or any portion of their Notes at their option only under the following circumstances: (1) during any fiscal quarter commencing after the fiscal quarter ended on September 30, 2014 (and only during such fiscal quarter), if the last reported sale price of the common stock for at least 20 trading days (whether or not consecutive) during the period of 30 consecutive trading days ending on the last trading day of the immediately preceding fiscal quarter is greater than or equal to 130% of the conversion price for the Notes on each applicable trading day; (2) during the five business day period after any five consecutive trading day period (the “measurement period”) in which the trading price per $1,000 principal amount of Notes for each trading day of the measurement period was less than 98% of the product of the last reported sale price of the common stock and the conversion rate on each such trading day; or (3) upon the occurrence of specified corporate events. On or after February 15, 2019 holders may convert all or any portion of their Notes at any time prior to the close of business on the second scheduled trading day immediately preceding the maturity date regardless of the foregoing conditions. The Company may not redeem the Notes prior to maturity and no sinking fund is provided for the Notes.
	If certain events occur prior to maturity, holders may require the Company to repurchase for cash all or any portion of their Notes at a repurchase price equal to 100% of the principal amount of the Notes to be repurchased, plus accrued and unpaid interest to, but excluding, the repurchase date. The Notes includes customary terms and covenants, including certain events of default after which the Notes may be declared or become due and payable immediately.
	ASC 470, Debt, applies to certain convertible debt instruments that may be settled in cash (or other assets), or partially in cash, upon conversion. The liability and equity components of convertible debt instruments within the scope of this accounting guidance must be separately accounted for in a manner that reflects the entity’s nonconvertible debt borrowing rate when interest expense is subsequently recognized. The excess of the principal amount of the debt over the amount allocated to the liability component is recognized as the value of the embedded conversion feature recorded within additional-paid-in capital in stockholders’ equity and amortized to interest expense using the effective interest method. The Company has concluded that this guidance applied to the Notes and accordingly, the Company is required to account for the liability and equity components of its Notes separately to reflect its nonconvertible debt borrowing rate. The Company estimated the fair value of its Notes without the conversion feature as of the date of issuance (“liability component”). The estimated fair value of the liability component of $137,430 was determined using a discounted cash flow technique. Key inputs used to estimate the fair value of the liability component included the Company’s estimated nonconvertible debt borrowing rate as of August 18, 2014 (the date the Notes were issued), the amount and timing of cash flows, and the expected life of the Notes. The estimated effective interest rate of 6.14% was estimated by comparing debt issuances with similar features of the Company’s debt, excluding the conversion feature, to companies with similar credit ratings during the same annual period as the Company.
	The excess of the gross proceeds received over the estimated fair value of the liability component totaling $22,566 has been allocated to the conversion feature (equity component) with a corresponding offset recognized as a discount to reduce the net carrying value of the Notes. The discount is being amortized to interest expense over a five-year period ending August 15, 2019 (the expected life of the liability component) using the effective interest method. In addition, transaction costs are required to be allocated to the liability and equity components based on their relative percentages. The applicable transaction costs allocated to the liability and equity components was $4,056 and $666, respectively. The transaction costs allocated to the liability represent debt issuance costs and are recorded as an asset in the Company’s unaudited condensed consolidated balance sheet. As of September 30, 2014, $670 and $3,310 are recorded in prepaid expense and other current assets and deposits and other assets, respectively, in the Company’s unaudited condensed consolidated balance sheet.
	Interest expense under the Notes is as follows:
		Three Months Ended				Nine Months Ended
		September 30,		September 30,		September 30,		September 30,
		2014		2013		2014		2013
	Amortization of debt discount	$	474	$	—	$	474	$	—
	Amortization of deferred financing costs		76		—		76		—
	Non-cash interest expense		550		—		550		—
	2.25% accrued interest		430		—		430		—
		$	980	$	—	$	980	$	—
	Based on the Company’s evaluation of the Notes in accordance with ASC 815-40, Contracts in Entity’s Own Equity, the Company determined that the Notes contain a single embedded derivative, comprising both the contingent interest feature related to timely filing failure, requiring bifurcation as the features is not clearly and closely related to the host instrument. The Company has determined that the value of this embedded derivative was nominal as of the date of issuance and as of September 30, 2014
	Credit Agreement
	In March 2012, the Company and one of its subsidiaries entered into a $50,000 credit facility with Silicon Valley Bank (SVB), which was subsequently amended in June 2012 and April 2013 (the 2012 credit facility). On April 12, 2013, the Company, one its subsidiaries and SVB entered into an amendment to the 2012 credit facility to extend the termination date from April 15, 2013 to April 30, 2013. On April 18, 2013, the Company, one of its subsidiaries and SVB terminated the 2012 credit facility.
	On April 18, 2013, the Company entered into a $70,000 senior secured revolving credit facility with several lenders from time to time party thereto and SVB, as administrative agent, swing line lender, issuing lender, lead arranger and book manager (SVB and together with other lenders, and referred to herein as the lenders), which was subsequently amended in August 2013, December 2013 and January 2014 (2013 credit facility). The 2013 credit facility replaced the 2012 credit facility. On August 11, 2014, the Company terminated the 2013 credit facility. There were no outstanding borrowings under the 2013 credit facility as of the date of termination. The Company did not incur any termination penalties in connection with this termination, however, as a result of this termination the Company expensed to interest expense during the three month period ended September 30, 2014 the remaining unamortized deferred financing costs from its 2013 credit facility totaling $376.
	On August 11, 2014, the Company entered into a $30,000 senior secured revolving credit facility pursuant to a loan and security agreement (the 2014 credit facility), between SVB and the Company. Subject to continued covenant compliance and borrowing base requirements, the 2014 credit facility provides for a one-year revolving line of credit in the aggregate amount of $30,000, the full amount of which may be available for issuances of letters of credit. The interest on revolving loans under the 2014 credit facility will accrue, at the Company’s election, at either (i) the LIBOR (determined based on the per annum rate of interest at which deposits in United States Dollars are offered to SVB in the London interbank market) plus 2.00%, or (ii) the “prime rate” as quoted in the Wall Street Journal with respect to the relevant interest period plus 1.00%. The revolving loans also bear a fee of 0.25% applied to the unused portion of the revolving loans and the fee is payable quarterly. The letter of credit fee charged under the 2014 Loan Agreement is 1.50% per annum on the face amount of any letters of credit, plus customary fronting fees. The 2014 credit facility terminates and all amounts outstanding thereunder are due and payable in full on August 11, 2015.
	The obligations under the 2014 credit facility and any related bank services provided by SVB will be guaranteed by several of the Company’s domestic subsidiaries and are secured by substantially all of the Company’s and several of its domestic subsidiaries’ domestic assets, other than intellectual property and other customarily excluded collateral.
	The 2014 credit facility contains customary terms and conditions for credit facilities of this type, including restrictions on the ability of the Company and its subsidiaries to incur additional indebtedness, create liens, enter into transactions with affiliates, transfer assets, pay dividends or make distributions on capital stock of the Company (other than certain permitted distributions set forth therein), consolidate or merge with other entities, or suffer a change in control. In addition, the Company is required to meet certain financial covenants customary with this type of agreement, including maintaining minimum unrestricted cash and a minimum specified ratio of current assets to current liabilities.
	The 2014 credit facility contains customary events of default, including for payment defaults, breaches of representations, breaches of affirmative or negative covenants, cross defaults to other material indebtedness, bankruptcy and failure to discharge certain judgments. Upon an event of default under the 2014 credit facility, SVB will have the right to accelerate the Company’s obligations under the 2014 credit facility and require the Company to cash collateralize any outstanding letters of credit. In addition, upon an event of default relating to certain insolvency events involving the Company and its subsidiaries, the obligations under the 2014 credit facility will be automatically accelerated. In the event of a termination or an event of default, the Company may be required to cash collateralize any outstanding letters of credit up to 105% of their face amount.
	As of September 30, 2014, the Company was in compliance with all of its covenants under the 2014 credit facility. The Company believes that it is reasonably assured that it will comply with the covenants of the 2014 credit facility for the foreseeable future.
	As of September 30, 2014, the Company had no borrowings, but had outstanding letters of credit totaling $13,409, under the 2014 credit facility. The decrease in the amount of outstanding letters of credit from December 31, 2013 to September 30, 2014 is primarily the result of a reduction in the collateral requirements for demand response arrangements and obligations. As of September 30, 2014, the Company had $16,591 available under the 2014 credit facility for future borrowings or issuances of additional letters of credit. Subsequent to September 30, 2014, the outstanding letters of credit have increased as a result of the issuance of additional letters of credit related to collateral requirements for new demand response arrangements totaling $5,079.

Commitments_and_Contingencies

Commitments and Contingencies	9 Months Ended
	Sep. 30, 2014
Commitments and Contingencies Disclosure [Abstract]	'
Commitments and Contingencies	'
	10. Commitments and Contingencies
	In July 2012, the Company entered into a lease for its principal executive offices at One Marina Park Drive, Floors 4-6, Boston, Massachusetts. The lease term is through July 2020 and the lease contains both a rent holiday period and escalating rental payments over the lease term. The lease requires payments for additional expenses such as taxes, maintenance, and utilities and contains a fair value renewal option. The Company began occupying the space during the second quarter of fiscal 2013. In accordance with the terms of the lease, the landlord provided certain lease incentives with respect to the leasehold improvements. In accordance with ASC 840, Leases (ASC 840), the Company recorded the incentives as deferred rent and will reflect these amounts as reductions of lease expense over the lease term. Although lease payments under this arrangement did not commence until August 2013, as the Company had the right to use and controlled physical access to the space, it determined that the lease term commenced in July 2012 and, as a result, began recording rent expense on this lease arrangement at that time on a straight-line basis. The lease also contains certain provisions requiring the Company to restore certain aspects of the leased space to its initial condition. The Company has determined that these provisions represent asset retirement obligations and recorded the estimated fair value of these obligations as the related leasehold improvements were incurred. The Company will accrete the liability to fair value over the life of the lease as a component of operating expenses. As of September 30, 2014, the Company recorded an asset retirement obligation of $417.
	In March 2014, the Company entered into a lease for its California operations. The lease term runs through September 2019 and the lease contains both a rent holiday period and escalating rental payments over the lease term. The lease requires payments for additional expenses such as taxes, maintenance, and utilities and contains a fair value renewal option. The lease commenced on April 1, 2014.
	In connection with the Company’s acquisitions completed during the nine month period ended September 30, 2014, the Company acquired certain facility operating lease arrangements which were all considered to contain current market terms and rates. These leases have original lease terms between one and ten years and expire through March 2020. Certain of the leases require payments for additional expenses such as taxes, maintenance, and utilities and contain fair value renewal options. There were no ongoing rent holidays or escalating rent payments over the remaining lease terms as of the dates of acquisition.
	On October 9, 2014, the Company entered into an amendment to its lease for its principal executive offices to obtain additional space. (see Note 1 – Subsequent Events for further discussion).
	The future minimum lease payments for operating leases with non-cancelable terms of more than one year, including the October 2014 operating lease described above, were as follows:
		Operating Leases
	Remainder of 2014	$	1,714
	2015		7,630
	2016		7,894
	2017		7,458
	2018		7,720
	Thereafter		10,584
	Total minimum lease payments (not reduced by sublease rentals of $161)	$	43,000
	As of September 30, 2014 and December 31, 2013, the Company had a deferred rent liability representing rent expense recorded on a straight-line basis in excess of contractual lease payments of $7,259 and $7,629, respectively, which is included in other liabilities in the accompanying unaudited condensed consolidated balance sheets.
	As of September 30, 2014, the Company was contingently liable under outstanding letters of credit for $13,409. As of September 30, 2014 and December 31, 2013, the Company had restricted cash balances of $1,097 and $1,834, respectively, which primarily related to cash utilized to collateralize certain demand response programs.
	The Company is subject to performance guarantee requirements under certain utility and electric power grid operator customer contracts and open market bidding program participation rules, which may be secured by cash or letters of credit. Performance guarantees as of September 30, 2014 were $15,463 and included deposits held by certain customers of $1,874 and certain restricted cash utilized to collateralize certain demand response programs of $180 at September 30, 2014. These amounts primarily represent up-front payments required by utility and electric power grid operator customers as a condition of participation in certain demand response programs and to ensure that the Company will deliver its committed capacity amounts in those programs. If the Company fails to meet its minimum committed capacity requirements, a portion or all of the deposits may be forfeited. The Company assessed the probability of default under these customer contracts and open market bidding programs and has determined the likelihood of default and loss of deposits to be remote. In addition, under certain utility and electric power grid operator customer contracts, if the Company does not achieve the required performance guarantee requirements, the customer can terminate the arrangement and the Company would potentially be subject to termination penalties. Under these arrangements, the Company defers all fees received up to the amount of the potential termination penalty until the Company has concluded that it can reliably determine that the potential termination penalty will not be incurred or the termination penalty lapses. As of September 30, 2014, the Company had $1,027 in deferred fees for these arrangements which were included in deferred revenues as of September 30, 2014. As of September 30, 2014, the maximum termination penalty to which the Company could be subject under these arrangements, which the Company has deemed not probable of being incurred, was approximately $7,341.
	As of September 30, 2014 and December 31, 2013, the Company accrued in the accompanying unaudited condensed consolidated balance sheets $373 and $1,720, respectively, of performance adjustments related to fees received for its participation in a certain demand response program. The decrease in the accrual from December 31, 2013 was the result of the Company repaying $1,488 to the electric power grid operator during the nine month period ended September 30, 2014 since the Company did not deliver all of its MW obligations under this demand response program, offset by an increase in additional performance adjustments. The Company believes that it is probable that these performance adjustments will need to be re-paid to the electric power grid operator and since the electric power grid operator has the right to require repayment at any point at its discretion, the amounts have been classified as a current liability.
	The Company typically grants customers a limited warranty that guarantees that its hardware will substantially conform to current specifications for one year from the delivery date. Based on the Company’s operating history, the liability associated with product warranties has been determined to be nominal.
	In connection with the Company’s agreement for its employee health insurance plan, the Company could be subject to an additional payment if the agreement is terminated. The Company has not elected to terminate this agreement nor does the Company believe that termination is probable for the foreseeable future. As a result, the Company has determined that it is not probable that a loss is likely to occur and no amounts have been accrued related to this potential payment upon termination. As of September 30, 2014, the payment due upon termination would be $928.
	On March 15, 2011, the Federal Energy Regulatory Commission (FERC) issued Order 745, Demand Response Compensation in Organized Wholesale Energy Markets, which was effective April 25, 2011. Under Order 745, the FERC amended its regulations under the Federal Power Act to ensure that when a demand response resource participating in an organized wholesale energy market administered by a Regional Transmission Organization (RTO) or Independent System Operator (ISO) has the capability to balance supply and demand as an alternative to a generation resource and when dispatch of that demand response resource is cost-effective as determined by the net benefits test described in this rule, that demand response resource must be compensated for the service it provides to the energy market at the market price for energy, referred to as the locational marginal price (LMP). This approach for compensating demand response resources helped to ensure the competitiveness of organized wholesale energy markets and remove barriers to the participation of demand response resources, thus ensuring just and reasonable wholesale rates. As a result, Order 745 impacted the energy rates that the Company received in two open market economic demand response programs.
	On May 23, 2014, the United States Court of Appeals for the District of Columbia Circuit issued two orders (EPSA v. FERC) related to FERC Order 745, a ruling relating to demand response compensation in FERC administered wholesale markets. In a 2-1 decision of a panel of the D.C. Circuit, the Court vacated Order 745 on the grounds that FERC lacked jurisdiction over demand response. The Court further stayed its own order until seven days following disposition of any timely petition for rehearing. Order 745 relates exclusively to compensation in FERC jurisdictional wholesale energy markets, and by its terms does not apply to FERC jurisdictional capacity markets. On June 11, 2014, the FERC and other parties filed motions seeking rehearing en banc of the 2-1 decision vacating Order 745, which motions were denied on September 17, 2014. On September 22, 2014, FERC filed a motion with the Court to stay the implementation of the Court’s mandate in EPSA v. FERC, which motion was granted by the Court on October 20, 2014. At the present time, Order 745 remains in effect, per the Court’s stay, and is likely to remain in effect pending a petition for writ of certiorari to the United States Supreme Court.
	Pursuant to the Federal Power Act, Order 745 was implemented “subject to refund”, which means that FERC retained the discretion to order refunds, if appropriate, of revenues associated with implementation of Order 745. The “subject to refund” requirement does not require refund, and given the FERC’s past treatment of its refund cases, the Company believes that the likelihood of refunds actually being required is not significant. The Company notes that with respect to the historical fees received from participation in programs that were impacted by Order 745, that Order 745 was effective and binding and that the Company delivered its service in accordance with the applicable market and program tariffs and manuals. As a result, the Company has concluded that the historical revenue recognition was appropriate and that the potential risk of refund as a result of the May 23, 2014 Court ruling on Order 745 should be evaluated as a potential contingent loss as a result of this event in accordance with ASC 450, Contingencies. Based on the Company’s assessment of this matter, it has determined that a loss is not currently probable. As a result, no loss accrual is currently recorded under ASC 450. Based on the Company’s assessment, it concluded that it is reasonably possible that the Company may incur a loss and the potential range of loss would be the fees received under the program, which is approximately $20,100.
	Subsequent to May 23, 2014, the Company has determined that due to the potential risk of refund, all fees received prospectively from continued participation, if any, in wholesale energy market demand response programs implemented pursuant to Order 745 and administered by a RTO or ISO will be deferred until such time as the fees are either refunded or become no longer subject to refund or adjustment. Subsequent to May 23, 2014 through September 30, 2014, the Company has received and deferred $658 of fees related to these programs.

Stockholders_Equity

Stockholders' Equity	9 Months Ended
	Sep. 30, 2014
Text Block [Abstract]	'
Stockholders' Equity	'
	11. Stockholders’ Equity
	2014 Long-Term Incentive Plan
	On May 29, 2014, the Company’s stockholders approved the EnerNOC, Inc. 2014 Long-Term Incentive Plan (the 2014 Plan). The 2014 Plan provides for the grant of incentive stock options, non-statutory stock options, stock appreciation rights, restricted stock awards, restricted stock unit awards, other stock awards, and performance awards that may be settled in cash, stock, or other property.
	Subject to adjustment for certain changes in the Company’s capitalization, the total number of shares of the Company’s common stock that may be issued under the 2014 Plan will not exceed 1,941,517 shares plus the number of shares subject to stock awards outstanding under the Company’s Amended and Restated 2007 Employee, Director and Consultant Stock Plan (the 2007 Plan), and the EnerNOC, Inc. Amended and Restated 2003 Stock Option and Incentive Plan (the 2003 Plan) that (i) expire or otherwise terminate without all of the shares covered by such award having been issued, (ii) are settled in cash, (iii) are forfeited back to or repurchased by the Company because of the failure to meet a contingency or condition required for the vesting of such shares, (iv) are reacquired or withheld (or not issued) by the Company to satisfy the exercise or purchase price of an award (including any shares that are not delivered because such award is exercised through a reduction of shares subject to such award), or (v) are reacquired or withheld (or not issued) by the Company to satisfy a tax withholding obligation in connection with an award.
	If a stock award granted under the 2014 Plan expires or otherwise terminates without all of the shares covered by such stock award having been issued, or is settled in cash, such expiration, termination or settlement will not reduce the number of shares of common stock that may be available for issuance under the 2014 Plan, and the unissued shares subject to such stock award will again become available for issuance under the 2014 Plan. If any shares of common stock issued pursuant to a stock award are forfeited back to or repurchased by the Company because of the failure to meet a contingency or condition required to vest such shares, then the shares that are forfeited or repurchased will again become available for issuance under the 2014 Plan. In addition, any shares of common stock reacquired or withheld (or not issued) by the Company in satisfaction of tax withholding obligations on a stock award or as consideration for the exercise or purchase price of a stock award will again become available for issuance under the 2014 Plan. During the period of the effective date of the 2014 Plan through September 30, 2014, the Company repurchased 60,729 shares to satisfy employee tax withholdings that became available for future grant under the 2014 Plan.
	All of the Company’s and its affiliates’ employees, non-employee directors and consultants are eligible to participate in the 2014 Plan and may receive all types of awards other than incentive stock options. Incentive stock options may be granted under the 2014 Plan only to the Company’s and its affiliates’ employees (including officers).
	As of September 30, 2014, 1,624,783 shares were available for future grant under the 2014 Plan.
	Share Repurchase Program
	On August 6, 2013, the Company’s Board of Directors authorized the repurchase of up to $30,000 of the Company’s common stock during the period from August 6, 2013 through August 6, 2014 (the First Repurchase Program), unless earlier terminated by the Board of Directors. During the three and nine month periods ended September 30, 2014, there were no repurchases of the Company’s common stock pursuant to its First Repurchase Program, and the First Repurchase Program expired on August 6, 2014.
	On August 11, 2014, the Company’s Board of Directors authorized the repurchase of up to $50,000 of the Company’s common stock during the period from August 11, 2014 through August 8, 2015 (the Second Repurchase Program). The Company used $29,973 of the net proceeds from its offering of Notes to repurchase 1,514,552 shares of its common stock at a purchase price of $19.79 per share, which was the closing price of the Common Stock on The NASDAQ Global Select Market on August 12, 2014. Additional repurchases of common stock under the Second Repurchase Program may be executed periodically on the open market as market and business conditions warrant. During the three month period ended September 30, 2014, except as noted above, the Company did not make any additional repurchases of its common stock.
	The Company repurchased 43,821 and 278,621 shares of its common stock during the three and nine month periods ended September 30, 2014, respectively, to cover employee minimum statutory income tax withholding obligations in connection with the vesting of restricted stock under its equity incentive plans, which the Company pays in cash to the appropriate taxing authorities on behalf of its employees. All shares were retired upon repurchase.
	Stock-Based Compensation
	During the nine month periods ended September 30, 2014 and 2013, the Company issued 6,632 and 8,920 shares of its common stock, respectively, to certain executives to satisfy a portion of the Company’s bonus obligation to these individuals.
	The fair value of options granted was estimated at the date of grant using the following weighted average assumptions:
			Nine Months Ended September 30,
			2014			2013
	Risk-free interest rate			2.49	%		1.8	%
	Vesting term, in years			2.22			2.22
	Expected annual volatility			70	%		75	%
	Expected dividend yield			—	%		—	%
	Exit rate pre-vesting			7.7	%		7.7	%
	Exit rate post-vesting			14.06	%		14.06	%
	The risk-free interest rate is the rate available as of the option date on zero-coupon United States government issues with a term equal to the expected life of the option. Volatility measures the amount that a stock price has fluctuated or is expected to fluctuate during a period. The Company calculates volatility using a component of implied volatility and historical volatility to determine the value of share-based payments. The Company has not paid dividends on its common stock in the past and does not plan to pay any dividends for the foreseeable future. In addition, the terms of the 2014 credit facility preclude the Company from paying dividends. During the three and nine month periods ended September 30, 2014, the Company updated its estimated pre-vesting and post-vesting exit rates applied to options, restricted stock and restricted stock units based on an evaluation of demographics of its employee groups and historical forfeitures for these groups in order to determine its option valuations as well as its stock-based compensation expense noting no change in the exit-rate post vesting and no material changes in the expected annual volatility or exit rate pre-vesting. The changes in estimates of the volatility and exit rate pre-vesting did not have a material impact on the Company’s stock-based compensation expense recorded in the accompanying unaudited condensed consolidated statements of income for the three and nine month periods ended September 30, 2014.
	The components of stock based compensation expense are disclosed below:
			Three Months Ended							Nine Months Ended
			September 30,							September 30,
			2014			2013				2014				2013
	Stock options		$	44		$	333			$	301			$	1,081
	Restricted stock and restricted stock units			4,091	(1)		3,488				11,860	(1)			10,751
	Total		$	4,135		$	3,821			$	12,161			$	11,832
	-1	Due to the fact that the Company’s chief executive officer is required to receive his 2014 performance based bonus, if achieved, in shares of common stock of the Company determined based on the cash value of such bonus divided by the fair market value of the Company’s common stock on the date that the Company’s Compensation Committee validates the achievement of the performance bonus metrics, in accordance with the Company’s policy, the Company is recording this amount as stock-based compensation expense ratably over the applicable performance and service period in accordance with ASC 718, Stock Compensation (ASC 718). During the three and nine month periods ended September 30, 2014, the Company recorded $129 and $382, respectively, of stock-based compensation expense.
	Stock based compensation is recorded in the accompanying unaudited condensed consolidated statements of income, as follows:
			Three Months Ended							Nine Months Ended
			September 30,							September 30,
			2014			2013				2014				2013
	Selling and marketing expenses		$	1,512		$	1,426			$	4,077			$	4,272
	General and administrative expenses			2,262			2,049				7,066				6,521
	Research and development expenses			361			346				1,018				1,039
	Total		$	4,135		$	3,821			$	12,161			$	11,832
	The Company recognized an income tax benefit from share-based compensation arrangements of $219 during the three and nine month periods ended September 30, 2014. The Company recognized an income tax benefit from share-based compensation arrangements of $999 during the three and nine month periods ended September 30, 2013. In addition, no material compensation cost was capitalized during the three and nine month periods ended September 30, 2014 and 2013.
	The following is a summary of the Company’s stock option activity during the nine month period ended September 30, 2014:
			Nine Months Ended September 30, 2014
			Number of					Weighted-
			Shares			Exercise		Average				Aggregate
			Underlying			Price Per		Exercise Price				Intrinsic
			Options			Share		Per Share				Value
	Outstanding at December 31, 2013			960,742		$0.17 - $48.06		$	17.87			$	4,691	(2)
	Granted			8,559					19.77
	Exercised			(141,019	)				10.32				1,418	(3)
	Cancelled			(86,890	)				29.21
	Outstanding at September 30, 2014			741,392		$0.35 - $48.06		$	18			$	3,564	(4)
	Weighted average remaining contractual life in years: 2.7
	Exercisable at end of period			724,702		$0.35 - $48.06		$	18.02			$	3,534	(4)
	Weighted average remaining contractual life in years: 2.6
	Vested or expected to vest at September 30, 2014 (1)			740,024		$0.35 - $48.06		$	18			$	3,562	(4)
	-1	This represents the number of vested options as of September 30, 2014 plus the number of unvested options expected to vest as of September 30, 2014 based on the unvested options outstanding at September 30, 2014, adjusted for the estimated forfeiture rate of 7.7%.
	-2	The aggregate intrinsic value was calculated based on the positive difference between the estimated fair value of the Company’s common stock on December 31, 2013 of $17.21 and the exercise price of the underlying options.
	-3	The aggregate intrinsic value was calculated based on the positive difference between the fair value of the Company’s common stock on the applicable exercise dates and the exercise price of the underlying options.
	-4	The aggregate intrinsic value was calculated based on the positive difference between the estimated fair value of the Company’s common stock on September 30, 2014 of $16.96 and the exercise price of the underlying options.
	Additional Information About Stock Options
			Three Months Ended							Nine Months Ended
			September 30,							September 30,
			2014			2013				2014				2013
		In thousands, except share and							In thousands, except share and
		per share amounts							per share amounts
Total number of options granted during the period			5,750			500				8,559				4,000
Weighted-average fair value per share of options granted		$	11.12		$	8.68			$	11.2			$	10.15
Total intrinsic value of options exercised (1)		$	752		$	239			$	1,418			$	1,290
-1	Represents the difference between the market price at exercise and the price paid to exercise the options.
Of the stock options outstanding as of September 30, 2014, 732,899 options were held by employees and directors of the Company and 8,493 options were held by non-employees. For outstanding unvested stock options related to employees and directors of the Company as of September 30, 2014, the Company had $133 of unrecognized stock-based compensation expense, which is expected to be recognized over a weighted average period of 2.3 years. There were no unvested non-employee stock options as of September 30, 2014.
Restricted Stock and Restricted Stock Units
For non-vested restricted stock subject to service-based vesting conditions outstanding as of September 30, 2014, the Company had $21,254 of unrecognized stock-based compensation expense, which is expected to be recognized over a weighted average period of 2.9 years. For non-vested restricted stock subject to performance-based vesting conditions outstanding that were probable of vesting as of September 30, 2014, which represents all of the outstanding non-vested restricted stock subject to performance-based vesting conditions, the Company had $7,061 of unrecognized stock-based compensation expense, which is expected to be recognized over a weighted average period of 1.7 years. For non-vested restricted stock units subject to service-based vesting conditions outstanding as of September 30, 2014, the Company had $216 of unrecognized stock-based compensation expense, which is expected to be recognized over a weighted average period of 3.3 years. For non-vested restricted stock units subject to outstanding performance-based vesting conditions that were not probable of vesting at September 30, 2014, the Company had $4,909 of unrecognized stock-based compensation expense. If and when any additional portion of these non-vested restricted stock units are deemed probable to vest, the Company will reflect the effect of the change in estimate in the period of change by recording a cumulative catch-up adjustment to retroactively apply the new estimate.
Restricted Stock
The following table summarizes the Company’s restricted stock activity during the nine month period ended September 30, 2014:
					Weighted Average
		Number of			Grant Date Fair
		Shares			Value Per Share
Nonvested at December 31, 2013			2,395,322		$	13.48
Granted			1,125,749			19.96
Vested			(1,061,369	)		15.49
Cancelled			(206,000	)		12.89
Nonvested at September 30, 2014			2,253,702		$	17.09
All shares underlying awards of restricted stock are restricted in that they are not transferable until they vest. Restricted stock typically vests ratably over a four-year period from the date of issuance, with 25% cliff vesting after one year and the remaining 75% vesting ratably quarterly thereafter, with certain exceptions. Included in the above table are 10,500 shares of restricted stock granted to certain non-executive employees and 31,365 shares of restricted stock granted to members of the Company’s board of directors during the nine month period ended September 30, 2014 that immediately vested. Also included in the table above are shares of restricted stock granted to non-employee advisory board members. In fiscal 2013, the Company granted 33,000 shares of restricted stock to non-employee advisory board members. Of the 33,000 shares of restricted stock granted, 22,000 shares vest ratably on a quarterly basis over four years and 11,000 shares of restricted stock vest in equal annual tranches on July 1, 2014 and July 1, 2015, as long as the individuals continue to serve as advisory board members through the date of the applicable vesting. The Company will account for these share-based awards in accordance with ASC 505-50, Equity Based Payments to Non-Employees (ASC 505-50), which will result in the Company continuing to re-measure the fair value of the share-based awards until such time as the awards vest. During the three and nine month periods ended September 30, 2014, the Company recorded stock-based compensation expense related to these awards of $35 and $150, respectively. As of September 30, 2014, 20,625 shares were unvested and had a fair value of $406.
The fair value of restricted stock upon which vesting is solely service-based is expensed ratably over the vesting period. With respect to restricted stock where vesting contains certain performance-based vesting conditions, the fair value is expensed based on the accelerated attribution method as prescribed by ASC 718, over the vesting period. With the exception of certain executives whose employment agreements provide for continued vesting in certain circumstances upon departure, if the employee who received the restricted stock leaves the Company prior to the vesting date for any reason, the shares of restricted stock will be forfeited and returned to the Company. During the nine month period ended September 30, 2014, the Company granted 388,034 shares of non-vested restricted stock to certain executives that contain performance-based vesting conditions. Of these shares, 25% vest in 2015 if the performance criteria related to certain 2014 operating results are achieved and the executive is still employed as of the vesting date and the remaining 75% of the shares vest quarterly over a three year period thereafter as long as the executive is still employed as of the vesting date. If the performance criteria related to certain 2014 operating results are not achieved, 100% of the shares are forfeited.
During the three and nine month periods ended September 30, 2014, there were no changes to probabilities of vesting of performance-based stock awards which had a material impact on stock-based compensation expense or amounts expected to be recognized.
In July 2014, the Company’s board of directors approved a modification to certain non-executive employee’s share-based awards to provide for acceleration of vesting upon a change in control accompanied by certain other actions. This modification effected 436,415 shares of non-vested restricted stock and 1,890 unvested stock options to purchase the Company’s common stock. This modification resulted in a new measurement date which increased the fair value of these awards by $590. This incremental fair value will be recorded only if these individuals vest as a result of this modification. If these individuals vest in accordance with the original vesting terms, no incremental stock based compensation expense will be recorded.
Additional Information about Restricted Stock
		Three Months Ended							Nine Months Ended
		September 30,							September 30,
		2014			2013				2014				2013
		in thousands, except share and per
		share amounts
Total number of shares of restricted stock granted during the period			157,600			80,703				1,125,749				1,491,269
Weighted average fair value per share of restricted stock granted		$	19.54		$	13.53			$	19.96			$	16.47
Total number of shares of restricted stock vested during the period			158,450			138,282				1,061,369				833,521
Total fair value of shares of restricted stock vested during the period		$	2,996		$	2,024			$	22,357			$	13,359
Restricted Stock Units
The following table summarizes the Company’s restricted stock unit activity during the nine month period ended September 30, 2014:
		Number of			Weighted Average
		Shares			Grant Date Fair
					Value Per Share
Nonvested at December 31, 2013			34,250		$	28.59
Granted			262,882			20.08
Vested			(34,250	)		28.59
Cancelled			(6,260	)		20.11
Nonvested at September 30, 2014			256,622		$	20.08
During the nine month period ended September 30, 2014, the Company granted 250,382 shares of non-vested restricted stock units that contain performance-based vesting conditions to certain non-executive German employees. Of these shares, up to 10% vest in 2015 if the performance criteria related to certain 2014 operating results are achieved and the employee is still employed as of the vesting date, up to 20% vest in 2016 if the performance criteria related to certain 2015 operating results are achieved and the employee is still employed as of the vesting date, and up to the remaining 70% of the shares vest in 2017 if the performance criteria related to certain 2016 operating results are achieved and the employee is still employed as of the vesting date. If the performance criteria related to certain 2014, 2015 and 2016 operating results are not achieved, 100% of the shares are forfeited. As of September 30, 2014, the awards have not been deemed probable of vesting.
Additional Information about Restricted Stock Units
		Three Months Ended							Nine Months Ended
		September 30,							September 30,
		2014			2013				2014				2013
		in thousands, except share and per
		share amounts
Total number of shares of restricted stock units vested during the period			—			—				34,250				56,603
Total fair value of shares of restricted stock units vested during the period		$	—		$	—			$	772			$	948

Income_Taxes

Income Taxes	9 Months Ended
	Sep. 30, 2014
Income Tax Disclosure [Abstract]	'
Income Taxes	'
	12. Income Taxes
	Each interim period is considered an integral part of the annual period and tax expense is measured using an estimated annual effective tax rate. An enterprise is required, at the end of each interim reporting period, to make its best estimate of the effective tax rate for the full fiscal year and use that rate to provide for income taxes on a current year-to-date basis. However, if an enterprise is unable to make a reliable estimate of its annual effective tax rate, the actual effective tax rate for the year-to-date period may be the best estimate of the annual effective tax rate. For the nine month period ended September 30, 2014, the Company determined that it was able to reliably estimate its annual effective tax rate in all jurisdictions in which it operates.
	The Company has provided a $12,111 and $11,950 worldwide tax provision for the three month and nine month periods ended September 30, 2014, respectively, which represents an approximate effective tax rate of 24%. The tax provision consists of a tax expense on its foreign income, a U.S. tax expense related to state income taxes where no net operation losses are available, and a U.S. tax expense related to tax deductible goodwill that generates a deferred tax liability that cannot be used as a source of income against which deferred tax assets may be realized. The provision for income taxes for the nine month period ended September 30, 2014 includes a $1,069 benefit from income taxes due to the release of a portion of the U.S. valuation allowance in connection with the Entech acquisition during the three month period ended June 30, 2014 and a $1,120 provision for deferred income taxes in connection with the sale of Utility Solution Consulting (Note 15) during the three month period ended June 30, 2014. During the nine month period ended September 30, 2014, due to limitations on the use of net operating losses in certain states, the Company utilized income tax deductions related to the exercise of stock options and vesting of shares of restricted stock and recorded a benefit of $219 directly to additional paid-in capital.
	ASC 740 also provides criteria for the recognition, measurement, presentation and disclosures of uncertain tax positions. A tax benefit from an uncertain tax position may be recognized if it is “more likely than not” that the position is sustainable based solely on its technical merits. During the three and nine month periods ended September 30, 2014, there were no material changes in the Company’s uncertain tax positions.
	The Company reviews all available evidence to evaluate the recovery of deferred tax assets, including the recent history of losses in all tax jurisdictions, as well as its ability to generate income in future periods. As of September 30, 2014, due to the uncertainty related to the ultimate use of certain deferred income tax assets, the Company has recorded a valuation allowance on certain of its deferred tax assets.

Concentrations_of_Credit_Risk

Concentrations of Credit Risk	9 Months Ended
	Sep. 30, 2014
Risks and Uncertainties [Abstract]	'
Concentrations of Credit Risk	'
	13. Concentrations of Credit Risk
	The following table presents the Company’s significant customers. PJM Interconnection (PJM) is a regional electric power grid operator customer in the mid-Atlantic region that is comprised of multiple utilities and was formed to control the operation of the regional power system, coordinate the supply of electricity, and establish fair and efficient markets. Independent Market Operator (IMO) is an entity that was established to administer and operate the Western Australia (WA) wholesale electricity market. The main objectives of the IMO are to coordinate the supply of electricity, encourage competition in the market, establish fair and efficient markets, and ensure economic supply of electricity to customers in WA. No other customers comprised more than 10% of consolidated revenues during the three or nine month periods ended September 30, 2014 and 2013.
		Three Months Ended September 30,
		2014					2013
		Revenues		% of Total			Revenues		% of Total
				Revenues					Revenues
	PJM	$	225,155		68	%	$	171,377		62	%
	IMO	$	42,983		13	%	$	45,708		16	%
		Nine Months Ended September 30,
		2014					2013
		Revenues		% of Total			Revenues		% of Total
				Revenues					Revenues
	PJM	$	246,367		58	%	$	173,252		50	%
	IMO	$	47,380		11	%	$	45,708		13	%
	PJM, IMO and Pacific Gas and Electric (PG&E) were the only customers that comprised 10% or more of the Company’s accounts receivable balance at September 30, 2014, representing 14%, 14% and 12%, respectively, of such balance. PJM and Southern California Edison Company were the only customers that each comprised 10% or more of the Company’s accounts receivable balance at December 31, 2013, representing 39% and 18%, respectively, of such balance.
	Unbilled revenue related to PJM was $155,102 and $64,643 at September 30, 2014 and December 31, 2013, respectively. There was also no significant unbilled revenue for any other customers at September 30, 2014 and December 31, 2013.
	Deposits and restricted cash include funds to secure performance under certain contracts and open market bidding programs with electric power grid operator and utility customers. Deposits held by these customers were $1,874 and $128 at September 30, 2014 and December 31, 2013, respectively.

Legal_Proceedings

Legal Proceedings	9 Months Ended
	Sep. 30, 2014
Commitments and Contingencies Disclosure [Abstract]	'
Legal Proceedings	'
	14. Legal Proceedings
	The Company is subject to legal proceedings, claims and litigation arising in the ordinary course of business. The Company does not expect the ultimate costs to resolve these matters to have a material adverse effect on its consolidated financial condition, results of operations or cash flows.
	On May 3, 2013, a purported shareholder of the Company (the Plaintiff) filed a derivative and class action complaint in the United States District Court for the District of Delaware (the Court) against certain of the Company’s officers and directors as well as the Company as a nominal defendant (the Defendants). The complaint asserts derivative claims, purportedly brought on behalf of the Company, for breach of fiduciary duty, waste of corporate assets, and unjust enrichment in connection with certain equity grants (awarded in 2010, 2012, and 2013) that allegedly exceeded an annual limit on per-employee equity grants purported to be contained in the 2007 Plan. The complaint also asserts a direct claim, brought on behalf of the Plaintiff and a proposed class of the Company’s shareholders, alleging the Company’s proxy statement filed on April 26, 2013 was false and misleading because it failed to disclose that the equity grants were improper. The plaintiff seeks, among other relief, rescission of the equity grants, unspecified damages, injunctive relief, disgorgement, attorneys’ fees, and such other relief as the Court may deem proper.
	Defendants filed a motion to dismiss on August 30, 2013. Plaintiff responded to the motion on October 18, 2013 and Defendants replied on November 22, 2013. No hearing date has been set.
	On June 27, 2014, the parties engaged in mediation and reached agreement in principle on the terms of a potential settlement. Pursuant to the settlement, defendant members of the Company’s Board of Directors would cause their insurer to make a cash payment of $500 to the Company, and cause the Company to undertake certain reforms in connection with equity granting practices. However, the settlement remains subject to numerous contingencies, including court approval. The Court has scheduled a fairness hearing for December 15, 2014. Additionally, the Company’s management believes that the defendants have substantial legal and factual defenses to the claims in the complaint, and intends to pursue these defenses vigorously. There can be no assurance, however, that such efforts will be successful. However, as a result of this agreement in principle on the terms of a potential settlement, the Company has determined that it is probable that it will incur a loss related to this matter principally related to the remaining amount of its insurance deductible, which was not material and has been accrued for as of September 30, 2014. With respect to the $500 payment to the Company that would result under the terms of this settlement, this amount represents a contingent gain and will be recorded as other income, if and when, the amount is realized. In addition, regardless of the outcome of this matter, the matter may divert financial and management resources and result in general business disruption, including that the Company may suffer from adverse publicity that could harm its reputation and negatively impact its stock price.
	On November 6, 2014, a class action lawsuit was filed in the Delaware Court of Chancery against the Company, World Energy Solutions, Inc. (World Energy), Wolf Merger Sub Corporation, and members of the board of directors of World Energy arising out of the merger between the Company and World Energy. The lawsuit generally alleges that the members of the board of directors of World Energy breached their fiduciary duties to World Energy’s stockholders by entering into the merger agreement because they, among other things, failed to maximize stockholder value and agreed to preclusive deal-protection terms. The lawsuit also alleges that the Company and World Energy aided and abetted the board of directors of World Energy in breaching their fiduciary duties. The plaintiff seeks to stop or delay the acquisition of World Energy by the Company, or rescission of the merger in the event it is consummated, and seeks monetary damages in an unspecified amount to be determined at trial. The Company believes the allegations in this lawsuit are without merit and it intends to defend against them vigorously.
	Indemnification Provisions
	The Company includes indemnification provisions in certain of its contracts. These indemnification provisions include provisions indemnifying the customer against losses, expenses, and liabilities from damages that could be awarded against the customer in the event that the Company’s services and related enterprise software platforms are found to infringe upon a patent or copyright of a third party. The Company believes that its internal business practices and policies and the ownership of information limits the Company’s risk in paying out any claims under these indemnification provisions.

Gain_on_Sale_of_Service_Line

Gain on Sale of Service Line	9 Months Ended
	Sep. 30, 2014
Text Block [Abstract]	'
Gain on Sale of Service Line	'
	15. Gain on Sale of Service Line
	During the three month period ended December 31, 2013, the Company committed to a plan to sell a component of the business that the Company acquired in connection with its acquisition of Global Energy Partners, Inc. (Global Energy) in January 2011 related to consulting and engineering support services to the global electric utility industry, with a particular focus on providing consulting services to utilities (Utility Solutions Consulting). The Company engaged a third party consultant to assist the Company in actively marketing this service line for sale and identify a buyer. Based on the Company’s evaluation of the assets held for sale criteria under ASC 360-10, Impairment and Disposal of Long-Lived Assets, it concluded all of the criteria were met and that the assets and liabilities of Utility Solutions Consulting that should be classified as held for sale. The assets held for sale relate to separately identifiable intangible assets, including customer relationships and certain non-compete agreements that were acquired in connection with the Global Energy acquisition and specifically relate to Utility Solutions Consulting. Due to the fact that the Company concluded that Utility Solutions Consulting met the definition of a business in accordance with ASC 805, it included in assets held for sale the goodwill of the Company’s All Other reporting unit which was allocated to Utility Solutions Consulting, which is a component of this reporting unit. The amount of goodwill allocated to Utility Solutions Consulting was based on the relative fair values of this business and the portion of the reporting unit that will be retained. On April 16, 2014, the Company entered into an agreement with a third party to sell the Utility Solutions Consulting services line for up to $4,750 subject to satisfaction of certain conditions and representations. The transaction closed on May 30, 2014.
	The following table summarizes the assets sold in connection with this transaction:
	Customer relationship intangible assets, net	$	153
	Other definite-lived intangible assets, net		39
	Goodwill		489
	Total Assets Sold	$	681
	In accordance with the agreement, the Company received $4,275 at closing and $475 is being held in escrow to cover general representations and warranties, as well as, potential purchase price adjustment, if any, for fees that could have been earned related to contracts that were not assigned. The potential remaining purchase price adjustment for fees that could have been earned for contracts that were not assigned was $103 as of September 30, 2014 and the Company had deferred recognition of this portion of the purchase price as the Company has deemed this amount to be contingent upon the assignment of these contracts. As a result, the Company recognized a gain from the sale of Utility Solutions Consulting totaling $3,378, net of direct transaction costs and other expenses totaling $327 during the three month period ended June 30, 2014. During the three month period ended September 30, 2014, the remaining applicable contracts were assigned and the Company recognized $359 of the previously deferred gain resulting in a total gain recognized during the nine month period ended September 30, 2014 of $3,737. The Company concluded that the Utility Solutions Consulting disposal group meets the criteria of discontinued operations under ASC 205-20, Discontinued Operations (ASC 205-20). However, the Company has determined that the operations of Utility Solutions Consulting are neither quantitatively or qualitatively material to the Company’s current or historical consolidated operations and therefore, the results of operations of Utility Solutions Consulting have not been presented as discontinued operations in the Company’s accompanying consolidated statements of income for the three and nine month periods ended September 30, 2014 and 2013. As a result, the gain has been reflected as a separate component within income from operations with the corresponding discrete tax charge of $1,120 related to the increase in deferred tax liability as a result of the increased book and tax basis difference in goodwill being recorded as a component of the Company’s provision for income taxes during the nine month period ended September 30, 2014.

Gain_on_Sale_of_Assets

Gain on Sale of Assets	9 Months Ended
	Sep. 30, 2014
Text Block [Abstract]	'
Gain on Sale of Assets	'
	16. Gain on Sale of Assets
	On April 22, 2014, the Company entered into an agreement with a third party who is a C&I customer of the Company to sell its remaining two contractual demand response capacity resources related to an open market demand response program to that third party allowing that third party the ability to enroll directly with the applicable grid operator. Under the terms of the agreement, the Company agreed to sell each of these two demand response capacity resources with such sale and transfer being effective as of the date that each resource has been paid in full. The aggregate payment of $5,740 was allocated between each demand response capacity resource with $2,171 being allocated to the first demand response capacity resource and $3,569 being allocated to the second demand response capacity resource based on each resource’s relative fair value as determined by the potential future cash flows from each resource. As a mechanism to pay the consideration due for the purchase of these demand response capacity resources, the third party has agreed to allow the Company to withhold all payments that would be due and payable to this third party under its C&I contractual arrangements and in the event that the payments withheld through March 31, 2015 are not sufficient to cover the purchase price of these demand response capacity resources then the third party is required to pay the remaining amount in cash or otherwise would be in default under the agreement. Upon an event of default, the Company would retain ownership of any resource where the full purchase price had not been paid, as well as, retain $517 of fees received toward the purchase of that unpaid demand response capacity resource. The third party fully paid the purchase price for the first demand response capacity resource during the three month period ended June 30, 2014 and as a result, the sale of this resource was completed. As a result of the sale, the Company recognized a gain on the sale of this asset equal to the purchase price of $2,171 during the nine month period ended September 30, 2014. In addition, the Company is recognizing the guaranteed fees of $517 ratably through the end of the potential contractual period of March 31, 2015 to the extent that sufficient cash has been received. During the three and nine month period ended September 30, 2014, the Company has recognized $155 and $207, respectively, of these fees which is recorded in other (expense) income, net in the accompanying consolidated statements of income. As of September 30, 2014, the third party had not made sufficient payments related to the second demand capacity resource and therefore, the sale of this resource has not yet been completed and is not expected to be completed until 2015.

Recent_Accounting_Pronouncemen

Recent Accounting Pronouncements	9 Months Ended
	Sep. 30, 2014
Accounting Changes and Error Corrections [Abstract]	'
Recent Accounting Pronouncements	'
	17. Recent Accounting Pronouncements
	In April 2014, the Financial Accounting Standards Board (FASB) issued ASU No. 2014-08, Reporting Discontinued Operations and Disclosures of Disposals of Components of an Entity (ASU 2014-08). ASU 2014-08 amends the definition of discontinued operations under ASC 205-20 to only those disposals of components of an entity that represent a strategic shift that has (or will have) a major effect on an entity’s operations and financial results will be reported as discontinued operations in the financial statements. This guidance is effective for all disposals (or classifications as held for sale) of components of an entity that occur within annual periods beginning on or after December 15, 2014, and interim periods within those years. Early adoption is permitted, but only for disposals (or classifications as held for sale) that have not been reported in financial statements previously issued or available for issuance. The Company has early adopted this guidance as of January 1, 2014. The adoption of this guidance had no impact on the Company’s consolidated financial statements.
	In May 2014, FASB issued ASU No. 2014-09, Revenue from Contracts with Customers (ASU 2014-09). ASU 2014-09 provides guidance for revenue recognition and the standard’s core principle is that a company will recognize revenue when it transfers promised goods or services to customers in an amount that reflects the consideration to which the company expects to be entitled in exchange for those goods or services. The new guidance is effective for annual and interim periods beginning after December 15, 2016, with no early adoption permitted. Therefore, ASU No 2014-09 will be effective for the Company beginning in the first quarter of fiscal year 2017, and allows for full retrospective adoption applied to all periods presented or retrospective adoption with the cumulative effect of initially applying this update recognized at the date of initial application. The Company has not yet determined the method of adoption and is currently in the process of evaluating the impact of adoption of this ASU on its consolidated financial position and results of operations.

Description_of_Business_and_Ba1

Description of Business and Basis of Presentation (Policies)

9 Months Ended

Sep. 30, 2014

Accounting Policies [Abstract]

'

Description of Business

'

Description of Business

EnerNOC, Inc. (the Company) is a leading provider of energy intelligence software, or EIS, and related solutions. The Company unlocks the full value of energy management for commercial, institutional and industrial end-users of energy, which the Company refers to as its C&I or enterprise customers, as well as electric power grid operators and utilities by delivering a comprehensive suite of demand-side management solutions. The Company’s EIS and related solutions help its customers buy energy better, use less energy and be more strategic about when they consume energy in order to reduce overall energy spend and maximize productivity of that spend.

The Company’s EIS and related solutions provide technology-enabled demand response, demand management, utility bill management, supply management, visibility and reporting, facility optimization, and project management applications and services for its enterprise, electric power grid operator and utility customers. Demand response is an alternative to traditional electric power generation and transmission infrastructure projects that enables electric power grid operators and utilities to reduce the likelihood of service disruptions, such as brownouts and blackouts, during periods of peak electricity demand, and otherwise manage the electric power grid during short-term imbalances of supply and demand or during periods when energy prices are high. The Company’s solutions for utilities and grid operators include EnerNOC Demand Resource™, a turnkey demand response resource with a firm capacity commitment, and EnerNOC Demand Manager™, a Software-as-a-Service (SaaS) application that provides utilities and energy retailers with the underlying technology to manage their demand response programs and secure reliable demand-side resources. When the Company enters into an EnerNOC Demand Resource contract, it matches obligation, in the form of megawatts, or MW, that it agrees to deliver to its utility and electric power grid operator customers, with supply, in the form of MW that the Company is able to curtail from the electric power grid through its arrangements with its enterprise customers. When the Company is called upon by its utility or electric power grid operator customers to deliver its contracted capacity, the Company uses its Network Operations Center, or NOC, to remotely manage and reduce electricity consumption across its growing network of enterprise customer sites, making demand response capacity available to electric power grid operators and utilities on demand while helping enterprise customers achieve energy savings, improve financial results and realize environmental benefits. The Company receives recurring payments from electric power grid operators and utilities for providing its EnerNOC Demand Resource and the Company shares these recurring payments with its enterprise customers in exchange for those enterprise customers reducing their power consumption when called upon by the Company to do so. The Company occasionally reallocates and realigns its capacity supply and obligation through open market bidding programs, supplemental demand response programs, auctions or other similar capacity arrangements and bilateral contracts to account for changes in supply and demand forecasts, as well as changes in programs and market rules in order to achieve more favorable pricing opportunities. The Company refers to the above activities as managing its portfolio of demand response capacity. The Company’s EnerNOC Demand Manager product consists of long-term contracts with a utility customer for a SaaS solution that allows utilities to manage demand response capacity in utility-sponsored demand response programs. The Company’s EnerNOC Demand Manager provides its utility customers with real-time load monitoring, dispatching applications, customizable reports, measurement and verification, and other professional services.

The Company builds on its position as the world’s leading demand response provider by using its EIS to provide its enterprise customers with the ability to:

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manage energy supplier selection, procurement and implementation;

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manage energy budget forecasting;

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manage utility bills and payment; and

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measure, track, analyze, report and manage greenhouse gas emissions.

The Company’s EIS and related solutions provide its enterprise customers with the visibility they need to prioritize resources against the activities that will deliver the highest return on investment.

During the third quarter of fiscal 2014, the Company began to offer its EIS and related solutions at three subscription levels: basic, standard, and professional. The Company delivers SaaS solutions on all of the major Internet browsers and on leading mobile device operating systems. In addition to its EIS packages, the Company sells a data-driven energy efficiency suite of premium consulting and custom training services, including technology integration services, supply consulting, energy efficiency planning, audits, assessments, commissioning and retro-commissioning services, which are available for an hourly or fixed fee. The Company’s target customers for its EIS and related solutions, to which it sells primarily through the Company’s direct sales force, are enterprises that spend approximately $100,000/year per site or more on energy.

Since inception, the Company’s business has grown substantially. The Company began by providing its demand response solutions in one state in the United States in 2003 and has expanded to providing its EIS and related solutions in several regions throughout the United States, as well as internationally in Australia, Brazil, China, Germany, India, Ireland, Japan, New Zealand, South Korea and the United Kingdom.

Reclassifications

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Reclassifications

The Company has reclassified certain amounts in its unaudited condensed consolidated statements of income for the three and nine month periods ended September 30, 2013, to conform to the 2014 presentation. The reclassifications made relate to the presentation of the Company’s revenues from DemandSMART and EfficiencySMART, SupplySMART and other revenues to revenues from grid operators, revenues from utilities, and revenues from enterprise customers and was done in order to provide the users of its consolidated financial statements with additional insight into how the Company and its management view and evaluate its revenues and related growth. This reclassification within the unaudited condensed consolidated statements of income for the three and nine month periods ended September 30, 2013 had no impact on previously reported total consolidated revenues or consolidated results of operations.

Presentational Changes

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Presentational Changes

The Company has recorded certain adjustments related to the presentation of revenue and cost of revenue in its consolidated statement of operations for the three and nine months ended September 30, 2014. The Company has historically recorded revenue and cost of revenues net (as an agent) for certain transactions with C&I customers and upon further analysis during the quarter ended September 30, 2014, the Company concluded revenue and cost of revenues for these transactions should be recorded gross (as a principal). The Company assessed the materiality of the historical misstatements, individually and in aggregate, on its prior annual and quarterly consolidated financial statements and concluded the effect of the error was not material to its consolidated financial statements for any of the periods. The Company recorded an adjustment in the consolidated statement of income for the three months ended September 30, 2014 to correct the presentation of such revenues on a year-to-date basis. This correction resulted in an increase to both grid operator revenue and cost of revenue of $4,344 for the three month period ended September 30, 2014.

Basis of Consolidation

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Basis of Consolidation

The unaudited condensed consolidated financial statements of the Company include the accounts of its wholly-owned subsidiaries and have been prepared in conformity with accounting principles generally accepted in the United States (GAAP) and variable interest entities (VIE) in which the Company has variable interests are consolidated as the Company is the primary beneficiary and thus controls the VIE. Intercompany transactions and balances are eliminated upon consolidation.

On February 13, 2014, the Company acquired all of the outstanding capital stock of Entelios AG (Entelios) and all of the outstanding capital stock of Activation Energy DSU Limited (Activation) in separate purchase business combinations.

On April 2, 2014, the Company completed an acquisition of all of the outstanding stock of an international demand response entity.

On April 17, 2014, the Company completed acquisitions of all of the outstanding stock of EnTech Utility Service Bureau, Inc. (Entech US) and EnTech Utility Service Bureau Ltd. (Entech UK) and on May 9, 2014, the Company completed the acquisition of the remaining 50% ownership in EnTech USB Private Limited (Entech India), which was a joint venture between EnTech US and a third party (collectively all referred to as, Entech).

The results of operations of the acquired entities discussed above are included in the Company’s unaudited condensed consolidated statement of income from the date of acquisition forward.

Subsequent Events Consideration

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Subsequent Events Consideration

The Company considers events or transactions that occur after the balance sheet date but prior to the issuance of the financial statements to provide additional evidence relative to certain estimates or to identify matters that require additional disclosure. Subsequent events have been evaluated as required.

On October 9, 2014, the Company entered into an amendment to its lease for its principal executive offices (the July 5, 2012 Lease) to lease additional space. The Company’s lease for this additional space will commence on or about January 1, 2015, which is the date on which the Company has the right to control access and physical use of the leased space, and will be subject to the terms and conditions of the July 5, 2012 Lease. The lease term for the additional space shall coincide with the term for the July 5, 2012 Lease and expire on July 31, 2020 unless earlier terminated or further extended as provided in the July 5, 2012 Lease. The lease amendment contains both a rent holiday, under which lease payments do not commence until June 2015, and escalating rental payments. As a result, the Company will record rent on a straight-line basis in accordance with ASC 840, Leases, beginning upon the lease commencement date.

On November 4, 2014, the Company and one of its wholly-subsidiaries (Purchaser) entered into a definitive agreement and plan of merger (the Merger Agreement), to acquire World Energy Solutions, Inc., a Delaware corporation (the Target). Pursuant to the Merger Agreement, Purchaser will commence an offer (the Offer) to acquire all of the outstanding shares of the Target’s common stock, par value $0.0001 per share (the Shares) for $5.50 per share net to the seller in cash, without interest, subject to any required withholding of taxes. In addition to purchasing the Shares, the Company will assume the Target’s outstanding debt for a total transaction value of approximately $76,000 in cash. Completion of the Offer is subject to several conditions, including (i) that a majority of the shares outstanding (determined on a fully diluted basis) be validly tendered and not validly withdrawn prior to the expiration of the Offer; (ii) the absence of a material adverse effect on the Target; and (iii) certain other customary conditions. The Offer is not subject to a financing condition.

There were no other material recognizable subsequent events recorded or requiring disclosure in the September 30, 2014 unaudited condensed consolidated financial statements.

Use of Estimates in Preparation of Financial Statements

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Use of Estimates in Preparation of Financial Statements

The accompanying unaudited condensed consolidated financial statements have been prepared pursuant to the rules and regulations of the Securities and Exchange Commission (SEC). Certain information and footnote disclosures normally included in financial statements prepared in accordance with GAAP have been condensed or omitted pursuant to SEC rules and regulations. In the opinion of the Company’s management, the unaudited condensed consolidated financial statements and notes thereto have been prepared on the same basis as the audited consolidated financial statements contained in the Company’s Annual Report on Form 10-K for the fiscal year ended December 31, 2013, and include all adjustments (consisting of normal, recurring adjustments) necessary for the fair presentation of the Company’s financial position at September 30, 2014 and statements of income, statements of comprehensive income and statements of cash flows for the three and nine month periods ended September 30, 2014 and 2013. Operating results for the three and nine month periods ended September 30, 2014 are not necessarily indicative of the results to be expected for any other interim period or the entire fiscal year ending December 31, 2014 (fiscal 2014).

The preparation of these unaudited condensed consolidated financial statements requires the Company to make estimates and judgments that affect the reported amounts of assets, liabilities, revenues and expenses, and related disclosure of contingent assets and liabilities. On an on-going basis, the Company evaluates its estimates, including those related to revenue recognition, allowance for doubtful accounts, valuations and purchase price allocations related to business combinations, fair value of deferred acquisition consideration, fair value of accrued acquisition contingent consideration, expected future cash flows including growth rates, discount rates, terminal values and other assumptions and estimates used to evaluate the recoverability of long-lived assets and goodwill, estimated fair values of intangible assets and goodwill, amortization methods and periods, certain accrued expenses and other related charges, stock-based compensation, contingent liabilities, fair value of asset retirement obligations, tax reserves and recoverability of the Company’s net deferred tax assets and related valuation allowance.

Although the Company regularly assesses these estimates, actual results could differ materially. Changes in estimates are recorded in the period in which they become known. The Company bases its estimates on historical experience and various other assumptions that it believes to be reasonable under the circumstances. Actual results may differ from management’s estimates if these results differ from historical experience or other assumptions prove not to be substantially accurate, even if such assumptions are reasonable when made.

The Company is subject to a number of risks similar to those of other companies of similar and different sizes both inside and outside of its industry, including, but not limited to, rapid technological changes, competition from similar energy management applications, services and products provided by larger companies, customer concentration, government regulations, market or program rule changes, protection of proprietary rights and dependence on key individuals.

Revenue Recognition

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Revenue Recognition

The Company recognizes revenues in accordance with Accounting Standards Codification (ASC) 605, Revenue Recognition (ASC 605). In all of the Company’s arrangements, it does not recognize any revenues until it can determine that persuasive evidence of an arrangement exists, delivery has occurred, the fee is fixed or determinable, and it deems collection to be reasonably assured. In making these judgments, the Company evaluates the following criteria:

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Evidence of an arrangement. The Company considers a definitive agreement signed by the customer and the Company or an arrangement enforceable under the rules of an open market bidding program to be representative of persuasive evidence of an arrangement.

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Delivery has occurred. The Company considers delivery to have occurred when service has been delivered to the customer and no significant post-delivery obligations exist. In instances where customer acceptance is required, delivery is deemed to have occurred when customer acceptance has been achieved.

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Fees are fixed or determinable. The Company considers fees to be fixed or determinable unless the fees are subject to refund or adjustment or are not payable within normal payment terms. If the fee is subject to refund or adjustment and the Company cannot reliably estimate this amount, the Company recognizes revenues when the right to a refund or adjustment lapses. If the Company offers payment terms significantly in excess of its normal terms, it recognizes revenues as the amounts become due and payable or upon the receipt of cash.

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Collection is reasonably assured. The Company conducts a credit review at the inception of an arrangement to determine the creditworthiness of the customer. Collection is reasonably assured if, based upon evaluation, the Company expects that the customer will be able to pay amounts under the arrangement as payments become due. If the Company determines that collection is not reasonably assured, revenues are deferred and recognized upon the receipt of cash.

The Company maintains a reserve for customer adjustments and allowances as a reduction in revenues. In determining the Company’s revenue reserve estimate, and in accordance with company policy, the Company relies on historical data and known performance adjustments. These factors, and unanticipated changes in the economic and industry environment, could cause the Company’s reserve estimates to differ from actual results. The Company records a provision for estimated customer adjustments and allowances in the same period as the related revenues are recorded. These estimates are based on the specific facts and circumstances of a particular program, analysis of credit memo data, historical customer adjustments, and other known factors. If the data the Company uses to calculate these estimates does not properly reflect reserve requirements, then a change in the allowances would be made in the period in which such a determination is made and revenues in that period could be affected. As of September 30, 2014 and December 31, 2013, the Company’s revenue reserves were $475 and $475, respectively.

Revenues from grid operators and revenues from utilities principally represent demand response revenues. During the three and nine month periods ended September 30, 2014, revenues from grid operators and utilities were comprised of $318,629 and $396,057 of demand response revenues, respectively, and $960 and $4,546 of EIS and related solutions revenues, respectively. During the three and nine month periods ended September 30, 2013, revenues from grid operators and utilities were comprised of $267,376 and $318,362 of demand response revenues, respectively, and $1,597 and $5,920 of EIS and solutions revenues, respectively.

All revenues from enterprise customers for the three and nine month periods ended September 30, 2014 and 2013 were derived from EIS and related solutions.

Demand Response Revenues

The Company enters into contracts and open market bidding programs with utilities and electric power grid operators to provide demand response applications and services. Currently the Company has two principal service offerings under which it provides demand response applications and services: (1) full-service turnkey offering to utilities under which it manages all aspects of demand response program delivery to deliver a firm capacity resource (Demand Resource) and (2) utility partnership offering under which utilities can utilize software through a software as a service offering, integrated metering hardware, and professional services to support their tariff-based C&I demand response programs on a service-level agreement basis (Demand Manager).

The Company has evaluated the factors within ASC 605 regarding gross versus net revenue reporting for its demand response revenues and its payments to C&I customers. Based on the evaluation of the factors within ASC 605, the Company has determined that all of the applicable indicators of gross revenue reporting were met. The applicable indicators of gross revenue reporting included, but were not limited to, the following:

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The Company is the primary obligor in its arrangements with electric power grid operators and utility customers because the Company provides its demand response services directly to electric power grid operators and utilities under long-term contracts or pursuant to open market programs and contracts separately with C&I customers to deliver such services. The Company manages all interactions with the electric power grid operators and utilities, while C&I customers do not interact with the electric power grid operators and utilities. In addition, the Company assumes the entire performance risk under its arrangements with electric power grid operators and utility customers, including the posting of financial assurance to assure timely delivery of committed capacity with no corresponding financial assurance received from its C&I customers. In the event of a shortfall in delivered committed capacity, the Company is responsible for all penalties assessed by the electric power grid operators and utilities without regard for any recourse the Company may have with its C&I customers.

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The Company has latitude in establishing pricing, as the pricing under its arrangements with electric power grid operators and utilities is negotiated through a contract proposal and contracting process or determined through a capacity auction. The Company then separately negotiates payments to C&I customers and has complete discretion in the contracting process with the C&I customers.

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The Company has complete discretion in determining which suppliers (C&I customers) will provide the demand response services, provided that the C&I customer is located in the same region as the applicable electric power grid operator or utility.

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The Company is involved in both the determination of service specifications and performs part of the services, including the installation of metering and other equipment for the monitoring, data gathering and measurement of performance, as well as, in certain circumstances, the remote control of C&I customer loads.

As a result, the Company has concluded that it earns revenue (as a principal) from the delivery of demand response services to electric power grid operators and utility customers and records the amounts billed to the electric power grid operators and utility customers as gross demand response revenues and the amounts paid to C&I customers as cost of revenues.

EnerNOC Demand Resource Solution

The majority of the Company’s demand response revenues are generated from the EnerNOC Demand Resource solution. Demand response revenues consist of two elements: revenue earned from the Company’s ability to deliver committed capacity to its electric power grid operator and utility customers, which the Company refers to as capacity revenue; and revenue earned from additional payments made to the Company for the amount of energy usage actually curtailed from the grid during a demand response event, which the Company refers to as energy event revenue.

The Company recognizes demand response revenue when it has provided verification to the electric power grid operator or utility of its ability to deliver the committed capacity which entitles the Company to payments under the contract or open market program. Committed capacity is generally verified through the results of an actual demand response event or a measurement and verification test. Once the capacity amount has been verified, the revenue is recognized and future revenue becomes fixed or determinable and is recognized monthly until the next demand response event or test. In subsequent verification events, if the Company’s verified capacity is below the previously verified amount, the electric power grid operator or utility customer will reduce future payments based on the adjusted verified capacity amounts. Ongoing demand response revenue recognized between demand response events or tests that are not subject to penalty or customer refund are recognized in revenue. If the revenue is subject to refund and the amount of refund cannot be reliably estimated, the revenue is deferred until the right of refund lapses.

Commencing in fiscal 2012, all demand response capacity revenues related to the Company’s participation in the PJM open market program for its Limited demand response product (referred to as the PJM summer-only open market program in prior filings) are being recognized at the end of the four-month delivery period of June through September, or during the three month period ended September 30th of each year. Because the period during which the Company is required to perform (June through September) is shorter than the period over which payments are received under the program (June through May), a portion of the revenues that have been earned are recorded and accrued as unbilled revenue. Substantially all revenues related to the PJM open market program for the program year ended September 30, 2014 were recognized during the three month period ended September 30, 2014 and as a result of the billing period not coinciding with the revenue recognition period, the Company had $155,102 in unbilled revenues from PJM at September 30, 2014.

With respect to the PJM open market program, the Company commenced participation in a new service offering within this program on June 1, 2014. Under this new service delivery offering, which the Company refers to as the PJM Extended demand response program, the delivery period is from June through October and then May in the subsequent calendar year. The revenues and any associated penalties, if any, for underperformance related to participation in the PJM Extended demand response program are separate and distinct from the Company’s participation in other offerings within the PJM open market program. Under the PJM Extended demand response program, penalties incurred as a result of underperformance for a demand response event dispatched during the months of June through September and for a demand response test event are the same as the historical service offering in which the Company has participated, which the Company refers to as the PJM Limited demand response program. However, penalties incurred as a result of underperformance for an event dispatched during the month of October or the month of May are 1/52 multiplied by the number of the shortfall amount (committed capacity less actual delivered capacity) times the applicable capacity rate. Consistent with the PJM Limited demand response program, the Company notes that the fees could potentially be subject to adjustment or refund based on performance during the applicable performance period. The revenue will be recognized ratably over the delivery period if the Company can reliably estimate the amount of fees potentially subject to adjustment or refund as of the end of September, otherwise revenues related to its participation in this program would be recognized at the end of the delivery period. For the PJM Extended demand response delivery period that commenced on June 1, 2014 and ends on May 31, 2015, the potential fees that could be earned are not material, however, for subsequent years beyond the delivery period ending on May 31, 2015, the potential fees from participation in the PJM Extended demand response program could be material.

Demand response capacity revenues related to the Company’s participation in an open market program in Western Australia are potentially subject to refund and therefore, are deferred until a portion of such capacity revenues are reliably estimable which currently occurs upon an emergency event dispatch or until the end of the program period on September 30th. Historically all capacity revenues have been recognized during the three month period ended September 30th as there have previously been no emergency event dispatches. During the three month period ended June 30, 2014, there was an emergency event dispatch in this open market program and as a result, a portion of the capacity revenues were fixed and no longer subject to adjustment resulting in the recognition of $4,344 of capacity revenues and $1,982 of related cost of revenues during the three month period ended June 30, 2014. As of September 30, 2014, the Company determined that the amount of fees potentially subject to adjustment or refund was reliably estimable beginning with the new program year in Western Australia commencing on October 1, 2014. Therefore, future revenues will be recognized ratably over the delivery period from October 1 to September 30.

Energy event revenues are recognized when earned. Energy event revenue is deemed to be substantive and represents the culmination of a separate earnings process and is recognized when the energy event is initiated by the electric power grid operator or utility customer and the Company has responded under the terms of the contract or open market program. During the three and nine month periods ended September 30, 2014, the Company recognized $1,352 and $26,121, respectively, of energy event revenues, and during the three and nine month periods ended September 30, 2013, the Company recognized $19,281 and $23,440, respectively, of energy event revenues.

In 2012, the Company decided to net settle a portion of its future contractual delivery obligations in a certain open market bidding program. As of September 30, 2014, the Company entered into transactions to net settle a significant portion of its future delivery obligations and these transactions have been approved by the customer. As a result, as long as the other criteria for revenue recognition are met, the Company will recognize these fees from the net settlement transactions as revenues as they become due and payable with such fees being recorded as a component of grid operator revenues. During the three and nine month periods ended September 30, 2014, the Company recognized revenues of $3,523 and $11,325, respectively, related to these net settlement transactions.

The Company has evaluated the forward capacity programs in which it participates and has determined that its contractual obligations in these programs do not currently meet the definition of derivative contracts under ASC 815, Derivatives and Hedging (ASC 815).

EnerNOC Demand Manager Solution

Under the Company’s EnerNOC Demand Manager solution, the Company generally receives an ongoing fee for overall management of the utility demand response program based on enrolled capacity or enrolled C&I customers, which is not subject to adjustment based on performance during a demand response dispatch. The Company recognizes revenues from these fees ratably over the applicable service delivery period commencing upon when the C&I customers have been enrolled and the contracted services have been delivered. In addition, under this offering, the Company may receive additional fees for program start-up, as well as, for C&I customer installations. The Company has determined that these fees do not have stand-alone value as such services do not have value without the ongoing services related to the overall management of the utility demand response program. Therefore, the Company recognizes these fees over the estimated customer relationship period, which is generally the greater of three years or the contract period, commencing upon the enrollment of the C&I customers and delivery of the contracted services. Through September 30, 2014, revenues from EnerNOC Demand Manager have not been material to the Company’s consolidated results of operations.

Enterprise EIS and Related Solutions

The Company’s enterprise EIS and related solutions revenues generally represent ongoing software or service arrangements under which the revenues are recognized ratably over the service period commencing upon delivery of the contracted service with the customer. Under certain of the Company’s arrangements, a portion of the fees received may be subject to adjustment or refund based on the validation of the energy savings delivered after the implementation is complete. As a result, the Company defers the portion of the fees that are subject to adjustment or refund until such time as the right of adjustment or refund lapses, which is generally upon completion and validation of the implementation. In addition, under certain other of the Company’s arrangements, the Company sells proprietary equipment to C&I customers that is utilized to provide the ongoing services that the Company delivers. Currently, this equipment has been determined to not have stand-alone value. As a result, the Company defers revenues associated with the equipment and begins recognizing such revenue ratably over the expected C&I customer relationship period (generally three years), once the C&I customer is receiving the ongoing services from the Company. In addition, the Company capitalizes the associated direct and incremental costs, which primarily represent the equipment and third-party installation costs, and recognizes such costs over the expected C&I customer relationship period.

The Company follows the provisions of ASC Update No. 2009-13, Multiple-Deliverable Revenue Arrangements (ASU 2009-13). The Company typically determines the selling price of its services based on vendor specific objective evidence (VSOE). Consistent with its methodology under previous accounting guidance, the Company determines VSOE based on its normal pricing and discounting practices for the specific service when sold on a stand-alone basis. In determining VSOE, the Company’s policy is to require a substantial majority of selling prices for a product or service to be within a reasonably narrow range. The Company also considers the class of customer, method of distribution, and the geographies into which its products and services are sold when determining VSOE. The Company typically has had VSOE for its products and services.

In certain circumstances, the Company is not able to establish VSOE for all deliverables in a multiple element arrangement. This may be due to the infrequent occurrence of stand-alone sales for an element, a limited sales history for new services or pricing within a broader range than permissible by the Company’s policy to establish VSOE. In those circumstances, the Company proceeds to the alternative levels in the hierarchy of determining selling price. Third Party Evidence (TPE) of selling price is established by evaluating largely similar and interchangeable competitor products or services in stand-alone sales to similarly situated customers. The Company is typically not able to determine TPE and has not used this measure since the Company has been unable to reliably verify standalone prices of competitive solutions. Management’s best estimate of selling price (ESP) is established in those instances where neither VSOE nor TPE are available, by considering internal factors such as margin objectives, pricing practices and controls, customer segment pricing strategies and the product life cycle. Consideration is also given to market conditions such as competitor pricing information gathered from experience in customer negotiations, market research and information, recent technological trends, competitive landscape and geographies. Use of ESP is limited to a very small portion of the Company’s services, principally certain other EIS software and related solutions.

Foreign Currency Translation

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Foreign Currency Translation

Foreign currency translation adjustments are recorded as a component of stockholders’ equity within accumulated other comprehensive loss. Gains (losses) arising from transactions denominated in foreign currencies and the re-measurement of certain intercompany receivables and payables are included in other (expense) income, net in the unaudited condensed consolidated statements of income and were ($2,459) and $167 for the three month periods ended September 30, 2014 and 2013, respectively, and ($1,825) and ($1,156) for the nine month periods ended September 30, 2014 and 2013, respectively. Foreign currency exchange gains (losses) resulted primarily from foreign denominated intercompany receivables held by the Company from one of its Australian subsidiaries which mainly resulted from funding provided to complete the acquisition of Energy Response Holdings Pty Ltd (Energy Response) and fluctuations in the Australian dollar exchange rate, in addition to U.S. dollar denominated intercompany payables to the Company from one of its German subsidiaries and one of its UK subsidiaries which mainly resulted from funding provided to complete the acquisitions of Entelios and EnTech, respectively. During the three and nine month periods ended September 30, 2014, $146 ($182 Australian) and $6,447 ($6,881) Australian), respectively, of the intercompany receivable from the Company’s Australian subsidiary was settled resulting in a realized loss of $660 for the nine month period ended September 30, 2014. During the three and nine month periods ended September 30, 2013, $333 ($375 Australian) and $12,142 ($11,796 Australian), respectively, of the intercompany receivable from the Company’s Australian subsidiary was settled resulting in a realized loss of $54 and $402, respectively. During the three and nine month periods ended September 30, 2014 and 2013, there were no other material realized gains (losses) incurred related to transactions denominated in foreign currencies.

As of September 30, 2014, the Company had an intercompany receivable from its Australian subsidiary that is denominated in Australian dollars and not deemed to be of a “long-term investment” nature totaling $9,464 at September 30, 2014 exchange rates ($10,836 Australian). The decrease in the Australian intercompany receivable from December 31, 2013 was primarily due to intercompany settlements made during the nine month period ended September 30, 2014 offset by royalties and other support charges due to the U.S. parent for services and technology provided by the U.S. parent during the nine month period ended September 30, 2014. Two of the Company’s German subsidiaries had an intercompany payable to the Company that is denominated in U.S. dollars and not deemed to be of a “long-term investment” nature totaling $21,132 at September 30, 2014; and two of its UK subsidiaries had an intercompany payable to the Company that is denominated in U.S. dollars and not deemed to be of a “long-term investment” nature totaling $4,481 at September 30, 2014.

In addition, a portion of the funding provided by the Company to one of its Australian subsidiaries to complete the acquisition of Energy Response was deemed to be of a “long-term investment nature” and therefore, the resulting translation adjustments are being recorded as a component of stockholders’ equity within accumulated other comprehensive loss. As of September 30, 2014, the intercompany funding that is denominated in Australian dollars and deemed to be of a “long-term investment” nature totaled $21,671 at September 30, 2014 exchange rates ($20,364 Australian) and during the three and nine month periods ended September 30, 2014, the Company recorded translation adjustments of ($1,385) and ($389), respectively, related to this intercompany funding within accumulated other comprehensive loss.

Comprehensive Income

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Comprehensive Income

Comprehensive income is defined as the change in equity of a business enterprise during a period resulting from transactions and other events and circumstances from non-owner sources. As of September 30, 2014 and December 31, 2013, accumulated other comprehensive loss was comprised solely of cumulative foreign currency translation adjustments. The Company presents its components of other comprehensive income net of related tax effects, which have not been material to date.

Software Development Costs

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Software Development Costs

Software development costs, including license fees and external consulting costs, of $1,507 and $1,523 for the three month periods ended September 30, 2014 and 2013, respectively, and $4,648 and $5,835 for the nine month periods ended September 30, 2014 and 2013, respectively, have been capitalized in accordance with ASC 350-40, Internal-Use Software (ASC 350-40). The capitalized amount was included as software in property and equipment at September 30, 2014 and December 31, 2013. Amortization of capitalized internal use software costs was $1,547 and $1,434 for the three month periods ended September 30, 2014 and 2013, respectively, and $4,573 and $4,186 for the nine month periods ended September 30, 2014 and 2013, respectively. Accumulated amortization of capitalized internal use software costs was $26,014 and $21,441 as of September 30, 2014 and December 31, 2013, respectively.

Impairment of Property and Equipment

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Impairment of Property and Equipment

During the three and nine month periods ended September 30, 2014, as a result of the removal of certain demand response equipment from service, the Company concluded that there were no expected future direct cash flows associated with this demand response equipment and therefore, an impairment indicator existed. The Company determined that the residual value of this demand response equipment was nominal and as a result, recorded an impairment charge during the three and nine month periods ended September 30, 2014 of $175 and $527, respectively, to reduce the carrying value of such equipment to zero.

Industry Segment Information

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Industry Segment Information

The Company operates in the following major geographic areas as noted in the below chart. The “All other” designation includes revenues from other international locations, primarily consisting of Brazil, Canada, China, Germany, India, Japan, Ireland, New Zealand, South Korea and the United Kingdom. Revenues are based upon customer location and internationally totaled $57,739 and $52,908 for the three month periods ended September 30, 2014 and 2013, respectively, and totaled $80,471 and $66,952 for the nine month periods ended September 30, 2014 and 2013, respectively.

Revenues by geography as a percentage of total revenues are as follows:

Three Months Ended September 30,

Nine Months Ended September 30,

2014

2013

2014

2013

United States

82

%

81

%

81

%

81

%

Australia

13

16

12

14

All other

5

3

7

5

Total

100

%

100

%

100

%

100

%

As of September 30, 2014 and December 31, 2013, the long-lived assets related to the Company’s international subsidiaries were not material to the accompanying unaudited condensed consolidated financial statements taken as a whole.

Leases

'

In July 2012, the Company entered into a lease for its principal executive offices at One Marina Park Drive, Floors 4-6, Boston, Massachusetts. The lease term is through July 2020 and the lease contains both a rent holiday period and escalating rental payments over the lease term. The lease requires payments for additional expenses such as taxes, maintenance, and utilities and contains a fair value renewal option. The Company began occupying the space during the second quarter of fiscal 2013. In accordance with the terms of the lease, the landlord provided certain lease incentives with respect to the leasehold improvements. In accordance with ASC 840, Leases (ASC 840), the Company recorded the incentives as deferred rent and will reflect these amounts as reductions of lease expense over the lease term. Although lease payments under this arrangement did not commence until August 2013, as the Company had the right to use and controlled physical access to the space, it determined that the lease term commenced in July 2012 and, as a result, began recording rent expense on this lease arrangement at that time on a straight-line basis. The lease also contains certain provisions requiring the Company to restore certain aspects of the leased space to its initial condition. The Company has determined that these provisions represent asset retirement obligations and recorded the estimated fair value of these obligations as the related leasehold improvements were incurred. The Company will accrete the liability to fair value over the life of the lease as a component of operating expenses. As of September 30, 2014, the Company recorded an asset retirement obligation of $417.

Description_of_Business_and_Ba2

Description of Business and Basis of Presentation (Tables)	9 Months Ended
	Sep. 30, 2014
Accounting Policies [Abstract]	'
Percentage of Total Revenues	'
	Revenues by geography as a percentage of total revenues are as follows:
		Three Months Ended September 30,						Nine Months Ended September 30,
		2014			2013			2014			2013
	United States		82	%		81	%		81	%		81	%
	Australia		13			16			12			14
	All other		5			3			7			5
	Total		100	%		100	%		100	%		100	%
	As of September 30, 2014 and December 31, 2013, the long-lived assets related to the Company’s international subsidiaries were not material to the accompanying unaudited condensed consolidated financial statements taken as a whole.

Acquisitions_Tables

Acquisitions (Tables)	9 Months Ended
	Sep. 30, 2014
Entech [Member]	'
Components and Preliminary Allocation of Purchase Price	'
	The components and allocation of the purchase price consist of the following approximate amounts:
	Net tangible assets acquired	$	1,208
	Customer relationships		3,900
	Non-compete agreements		1,000
	Developed technology		700
	Trade name		260
	Deferred income tax liability		(1,689	)
	Goodwill		7,168
	Total	$	12,547
Schedule of Net Tangible Assets and Liabilities Acquired	'
	Net tangible assets acquired in the acquisition of Entech primarily related to the following:
	Cash	$	530
	Accounts receivable		1,537
	Property and equipment		275
	Other assets		242
	Accounts payable		(138	)
	Accrued payroll and related expenses		(311	)
	Accrued expenses and other liabilities		(526	)
	Deferred revenues		(63	)
	Deferred tax liability		(10	)
	Other long-term liabilities		(328	)
	Total	$	1,208
Entelios AG [Member]	'
Components and Preliminary Allocation of Purchase Price	'
	The components and allocation of the purchase price consist of the following approximate amounts:
	Net tangible liabilities assumed as of February 13, 2014	$	(50	)
	Customer relationships		4,084
	Non-compete agreements		204
	Developed technology		1,770
	Trade name		218
	Deferred income tax asset		2,070
	Deferred income tax liability		(2,070	)
	Goodwill		15,653
	Total	$	21,879
Schedule of Net Tangible Assets and Liabilities Acquired	'
	Net tangible liabilities assumed in the acquisition of Entelios primarily related to the following:
	Cash	$	1,564
	Accounts receivable		19
	Capitalized incremental direct customer contract costs		36
	Prepaid expenses and other current assets		148
	Property and equipment		377
	Other assets		72
	Accounts payable		(178	)
	Accrued payroll and related expenses		(970	)
	Accrued expenses and other liabilities		(1,098	)
	Deferred revenues		(20	)
	Total	$	(50	)
Activation Energy DSU Limited [Member]	'
Components and Preliminary Allocation of Purchase Price	'
	The components and allocation of the purchase price consist of the following approximate amounts:
	Net tangible assets acquired as of February 13, 2014	$	752
	Customer relationships		2,042
	Non-compete agreements		220
	Developed technology		545
	Trade name		82
	Deferred income tax liability		(361	)
	Goodwill		1,581
	Total	$	4,861
Schedule of Net Tangible Assets and Liabilities Acquired	'
	Net tangible assets acquired in the acquisition of Activation primarily related to the following:
	Cash	$	711
	Accounts receivable		472
	Prepaid expenses and other current assets		27
	Property and equipment		92
	Accounts payable		(45	)
	Accrued expenses and other current liabilities		(55	)
	Accrued capacity payments		(450	)
	Total	$	752

Intangible_Assets_and_Goodwill1

Intangible Assets and Goodwill (Tables)	9 Months Ended
	Sep. 30, 2014
Goodwill and Intangible Assets Disclosure [Abstract]	'
Summary of Gross Carrying Amount and Accumulated Amortization of Definite-Lived Intangible Assets	'
	The following table provides the gross carrying amount and related accumulated amortization of intangible assets as of September 30, 2014 and December 31, 2013:
					As of September 30, 2014					As of December 31, 2013
		Weighted Average			Gross					Gross
		Amortization			Carrying		Accumulated			Carrying		Accumulated
		Period (in years)			Amount		Amortization			Amount		Amortization
	Customer relationships		3.63		$	37,908	$	(18,608	)	$	29,663	$	(15,416	)
	Customer contracts		2.37		$	4,953	$	(3,483	)	$	4,887	$	(2,900	)
	Employment agreements and non-compete agreements		1.22			2,650		(1,669	)		1,676		(1,475	)
	Software		—			120		(120	)		120		(120	)
	Developed Technology		1.44			5,393		(2,889	)		2,277		(1,758	)
	Trade name		0.79			1,100		(687	)		575		(455	)
	Patents		5.39			180		(81	)		180		(68	)
	Total other definite-lived intangible assets					14,396		(8,929	)		9,715		(6,776	)
	Total				$	52,304	$	(27,537	)	$	39,378	$	(22,192	)
Schedule of Change in Carrying Amount of Goodwill	'
	The following table shows the change of the carrying amount of goodwill from December 31, 2013 to September 30, 2014:
	Balance at December 31, 2013	$	77,104
	Acquisitions		24,815
	Foreign currency translation		(1,492	)
	Balance at September 30, 2014	$	100,427

Net_Income_Per_Share_Tables

Net Income Per Share (Tables)	9 Months Ended
	Sep. 30, 2014
Earnings Per Share [Abstract]	'
Reconciliation of Basic and Diluted Share Amounts	'
	A reconciliation of net income attributable to EnerNOC, Inc. to the adjusted net income attributable to EnerNOC, Inc. utilized in the calculation of net income per share in accordance with the “if-converted” method outlined above is as follows (amounts in thousands):
		Three Months Ended				Nine Months Ended
		September 30,		September 30,		September 30,		September 30,
		2014		2013		2014		2013
	Net income attributable to EnerNOC, Inc.	$	96,673	$	106,857	$	38,875	$	41,969
	ADD: Interest expense related to convertible notes		980		—		980		—
	Adjusted net income attributable to EnerNOC, Inc.	$	97,653	$	106,857	$	39,855	$	41,969
A Reconciliation of Net Income to the Adjusted Net Income Utilized in the Calculation of Net Income Per Share	'
	A reconciliation of basic and diluted share amounts for the three and nine month periods ended September 30, 2014 and 2013 are as follows (shares in thousands):
		Three Months Ended				Nine Months Ended
		September 30,				September 30,
		2014		2013		2014		2013
	Basic weighted average common shares outstanding		27,795		27,920		28,075		27,693
	Weighted average common stock equivalents		877		923		1,068		924
	Incremental shares from assumed conversion of convertible notes		2,762		—		931		—
	Diluted weighted average common shares outstanding		31,434		28,843		30,074		28,617
	Weighted average anti-dilutive shares related to:
	Stock options		2		—		5		1
	Nonvested restricted shares		92		54		384		336
	Restricted stock units		7		—		10		9

Fair_Value_Measurements_Tables

Fair Value Measurements (Tables)	9 Months Ended
	Sep. 30, 2014
Fair Value Disclosures [Abstract]	'
Assets and Liabilities Measured at Fair Value on Recurring Basis	'
	The tables below present the balances of assets and liabilities measured at fair value on a recurring basis at September 30, 2014 and December 31, 2013:
			Fair Value Measurement at September 30, 2014 Using
					Quoted Prices in		Significant
					Active Markets		Other
					for Identical		Observable		Unobservable
			Totals		Assets (Level 1)		Inputs (Level 2)		Inputs (Level 3)
	Assets:
	Money market funds (1)		$	220,051	$	220,051	$	—	$	—
	Available for sale convertible debt instrument (2)		$	1,500	$	—	$	—	$	1,500
	Liabilities:
	Accrued contingent purchase price consideration (3)		$	553	$	—	$	—	$	553
	Deferred acquisition consideration (3)		$	832	$	—	$	—	$	832
	-1	Total of $219,871 included in cash and cash equivalents and $180 included in restricted cash in the accompanying unaudited condensed consolidated balance sheets and represents the only asset that the Company measures and records at fair value on a recurring basis. These money market funds represent excess operating cash that is invested daily into an overnight investment account. The decrease from December 31, 2013 was primarily due to cash used in operations and cash utilized for the Company’s acquisitions during the nine month period ended September 30, 2014.
	-2	Represents convertible debt investment in privately-held entity (refer to Note 4). Based on assessment of the financial information, including historical and forecasted results, of the privately-held entity, as well as, additional qualitative information, the Company has determined that there have been no changes in fair value of this investment.
	-3	Accrued contingent purchase price consideration, which resulted from the Company’s acquisitions of Entelios and Activation in February 2014, and deferred acquisition consideration, which resulted from the Company’s other immaterial acquisition completed in April 2014 and the Company’s acquisition of M2M in January 2011, the Company measures and records at fair value on a recurring basis using significant unobservable inputs (Level 3). The aggregate increase in fair value of liabilities for the nine month period ended September 30, 2014 was due to the increase in the liabilities as a result of a change in the fair value of the amortization of the applicable discounts related to the time value of money of $89 and changes in exchange rates. In addition, as a result of a change in probability of certain earn-outs related to the Company’s acquisition of Activation and of the Company’s other immaterial acquisition, there was an increase in fair value of these earn-outs of $202 recorded during the nine month period ended September 30, 2014. Refer to Note 2 for further discussion. There were no other changes to the probability or timing of payment during the nine month period ended September 30, 2014.
	With respect to assets measured at fair value on a non-recurring basis, these represent impaired long-lived assets (refer to Note 1 for discussion of the determination of fair value of these assets), impaired definite-lived intangible assets (refer to Note 2 for discussion of the determination of fair value of these assets) and cost method investments (refer to Note 4 for discussion of the determination of fair value of these assets).
	The table below presents the balances of assets and liabilities measured at fair value on a recurring basis at December 31, 2013:
			Fair Value Measurement at December 31, 2013 Using
					Quoted Prices in		Significant
					Active Markets		Other
					for Identical		Observable		Unobservable
			Totals		Assets (Level 1)		Inputs (Level 2)		Inputs (Level 3)
	Assets:
	Money market funds (1)		$	146,626	$	146,626	$	—	$	—
	Liabilities:
	Deferred acquisition consideration (2)		$	566	$	—	$	—	$	566
	-1	Total of $145,076 included in cash and cash equivalents and $1,550 included in restricted cash in the accompanying unaudited condensed consolidated balance sheets and represents the only assets that the Company measures and records at fair value on a recurring basis. These money market funds represent excess operating cash that is invested daily into an overnight investment account.
	-2	Deferred acquisition consideration which is a liability and was the result of the Company’s acquisition of M2M represents the only liability that the Company measures and records at fair value on a recurring basis using significant unobservable inputs (Level 3). The aggregate increase in fair value of this liability for the year ended December 31, 2013 of $33 was due to the increase in the liability as a result of the amortization of the discount related to the time value of money. There were no changes with respect to the timing of payment subsequent to December 31, 2013.

Borrowings_and_Credit_Arrangem1

Borrowings and Credit Arrangements (Tables)	9 Months Ended
	Sep. 30, 2014
Debt Disclosure [Abstract]	'
Summary of Interest Expense	'
	Interest expense under the Notes is as follows:
		Three Months Ended				Nine Months Ended
		September 30,		September 30,		September 30,		September 30,
		2014		2013		2014		2013
	Amortization of debt discount	$	474	$	—	$	474	$	—
	Amortization of deferred financing costs		76		—		76		—
	Non-cash interest expense		550		—		550		—
	2.25% accrued interest		430		—		430		—
		$	980	$	—	$	980	$	—

Commitments_and_Contingencies_

Commitments and Contingencies (Tables)	9 Months Ended
	Sep. 30, 2014
Commitments and Contingencies Disclosure [Abstract]	'
Future Minimum Lease Payments for Operating Leases	'
	The future minimum lease payments for operating leases with non-cancelable terms of more than one year, including the October 2014 operating lease described above, were as follows:
		Operating Leases
	Remainder of 2014	$	1,714
	2015		7,630
	2016		7,894
	2017		7,458
	2018		7,720
	Thereafter		10,584
	Total minimum lease payments (not reduced by sublease rentals of $161)	$	43,000

Stockholders_Equity_Tables

Stockholders' Equity (Tables)	9 Months Ended
	Sep. 30, 2014
Weighted Average Assumptions Used to Estimate Fair Value of Options	'
	The fair value of options granted was estimated at the date of grant using the following weighted average assumptions:
			Nine Months Ended September 30,
			2014			2013
	Risk-free interest rate			2.49	%		1.8	%
	Vesting term, in years			2.22			2.22
	Expected annual volatility			70	%		75	%
	Expected dividend yield			—	%		—	%
	Exit rate pre-vesting			7.7	%		7.7	%
	Exit rate post-vesting			14.06	%		14.06	%
Components of Stock Based Compensation Expense	'
	The components of stock based compensation expense are disclosed below:
			Three Months Ended							Nine Months Ended
			September 30,							September 30,
			2014			2013				2014				2013
	Stock options		$	44		$	333			$	301			$	1,081
	Restricted stock and restricted stock units			4,091	(1)		3,488				11,860	(1)			10,751
	Total		$	4,135		$	3,821			$	12,161			$	11,832
	-1	Due to the fact that the Company’s chief executive officer is required to receive his 2014 performance based bonus, if achieved, in shares of common stock of the Company determined based on the cash value of such bonus divided by the fair market value of the Company’s common stock on the date that the Company’s Compensation Committee validates the achievement of the performance bonus metrics, in accordance with the Company’s policy, the Company is recording this amount as stock-based compensation expense ratably over the applicable performance and service period in accordance with ASC 718, Stock Compensation (ASC 718). During the three and nine month periods ended September 30, 2014, the Company recorded $129 and $382, respectively, of stock-based compensation expense.
Stock Based Compensation	'
	Stock based compensation is recorded in the accompanying unaudited condensed consolidated statements of income, as follows:
			Three Months Ended							Nine Months Ended
			September 30,							September 30,
			2014			2013				2014				2013
	Selling and marketing expenses		$	1,512		$	1,426			$	4,077			$	4,272
	General and administrative expenses			2,262			2,049				7,066				6,521
	Research and development expenses			361			346				1,018				1,039
	Total		$	4,135		$	3,821			$	12,161			$	11,832
Summary of Company's Stock Option Activity	'
	The following is a summary of the Company’s stock option activity during the nine month period ended September 30, 2014:
			Nine Months Ended September 30, 2014
			Number of					Weighted-
			Shares			Exercise		Average				Aggregate
			Underlying			Price Per		Exercise Price				Intrinsic
			Options			Share		Per Share				Value
	Outstanding at December 31, 2013			960,742		$0.17 - $48.06		$	17.87			$	4,691	(2)
	Granted			8,559					19.77
	Exercised			(141,019	)				10.32				1,418	(3)
	Cancelled			(86,890	)				29.21
	Outstanding at September 30, 2014			741,392		$0.35 - $48.06		$	18			$	3,564	(4)
	Weighted average remaining contractual life in years: 2.7
	Exercisable at end of period			724,702		$0.35 - $48.06		$	18.02			$	3,534	(4)
	Weighted average remaining contractual life in years: 2.6
	Vested or expected to vest at September 30, 2014 (1)			740,024		$0.35 - $48.06		$	18			$	3,562	(4)
	-1	This represents the number of vested options as of September 30, 2014 plus the number of unvested options expected to vest as of September 30, 2014 based on the unvested options outstanding at September 30, 2014, adjusted for the estimated forfeiture rate of 7.7%.
	-2	The aggregate intrinsic value was calculated based on the positive difference between the estimated fair value of the Company’s common stock on December 31, 2013 of $17.21 and the exercise price of the underlying options.
	-3	The aggregate intrinsic value was calculated based on the positive difference between the fair value of the Company’s common stock on the applicable exercise dates and the exercise price of the underlying options.
	-4	The aggregate intrinsic value was calculated based on the positive difference between the estimated fair value of the Company’s common stock on September 30, 2014 of $16.96 and the exercise price of the underlying options.
Stock Options Activity Additional Information	'
	Additional Information About Stock Options
			Three Months Ended							Nine Months Ended
			September 30,							September 30,
			2014			2013				2014				2013
			In thousands, except share and							In thousands, except share and
			per share amounts							per share amounts
	Total number of options granted during the period			5,750			500				8,559				4,000
	Weighted-average fair value per share of options granted		$	11.12		$	8.68			$	11.2			$	10.15
	Total intrinsic value of options exercised (1)		$	752		$	239			$	1,418			$	1,290
	-1	Represents the difference between the market price at exercise and the price paid to exercise the options.
Restricted Stock [Member]	'
Summary of Company's Restricted Stock and Restricted Stock Units Activity	'
	The following table summarizes the Company’s restricted stock activity during the nine month period ended September 30, 2014:
						Weighted Average
			Number of			Grant Date Fair
			Shares			Value Per Share
	Nonvested at December 31, 2013			2,395,322		$	13.48
	Granted			1,125,749			19.96
	Vested			(1,061,369	)		15.49
	Cancelled			(206,000	)		12.89
	Nonvested at September 30, 2014			2,253,702		$	17.09
Additional Information about Restricted Stock and Restricted Stock Units	'
	Additional Information about Restricted Stock
			Three Months Ended							Nine Months Ended
			September 30,							September 30,
			2014			2013				2014				2013
			in thousands, except share and per
			share amounts
	Total number of shares of restricted stock granted during the period			157,600			80,703				1,125,749				1,491,269
	Weighted average fair value per share of restricted stock granted		$	19.54		$	13.53			$	19.96			$	16.47
	Total number of shares of restricted stock vested during the period			158,450			138,282				1,061,369				833,521
	Total fair value of shares of restricted stock vested during the period		$	2,996		$	2,024			$	22,357			$	13,359
Restricted Stock Units [Member]	'
Summary of Company's Restricted Stock and Restricted Stock Units Activity	'
	The following table summarizes the Company’s restricted stock unit activity during the nine month period ended September 30, 2014:
			Number of			Weighted Average
			Shares			Grant Date Fair
						Value Per Share
	Nonvested at December 31, 2013			34,250		$	28.59
	Granted			262,882			20.08
	Vested			(34,250	)		28.59
	Cancelled			(6,260	)		20.11
	Nonvested at September 30, 2014			256,622		$	20.08
Additional Information about Restricted Stock and Restricted Stock Units	'
	Additional Information about Restricted Stock Units
			Three Months Ended							Nine Months Ended
			September 30,							September 30,
			2014			2013				2014				2013
			in thousands, except share and per
			share amounts
	Total number of shares of restricted stock units vested during the period			—			—				34,250				56,603
	Total fair value of shares of restricted stock units vested during the period		$	—		$	—			$	772			$	948

Concentrations_of_Credit_Risk_

Concentrations of Credit Risk (Tables)	9 Months Ended
	Sep. 30, 2014
Risks and Uncertainties [Abstract]	'
Concentrations of Credit Risk of Significant Customers	'
	No other customers comprised more than 10% of consolidated revenues during the three or nine month periods ended September 30, 2014 and 2013.
		Three Months Ended September 30,
		2014					2013
		Revenues		% of Total			Revenues		% of Total
				Revenues					Revenues
	PJM	$	225,155		68	%	$	171,377		62	%
	IMO	$	42,983		13	%	$	45,708		16	%
		Nine Months Ended September 30,
		2014					2013
		Revenues		% of Total			Revenues		% of Total
				Revenues					Revenues
	PJM	$	246,367		58	%	$	173,252		50	%
	IMO	$	47,380		11	%	$	45,708		13	%

Gain_on_Sale_of_Service_Line_T

Gain on Sale of Service Line (Tables)	9 Months Ended
	Sep. 30, 2014
Text Block [Abstract]	'
Summary of Assets Sold	'
	The following table summarizes the assets sold in connection with this transaction:
	Customer relationship intangible assets, net	$	153
	Other definite-lived intangible assets, net		39
	Goodwill		489
	Total Assets Sold	$	681

Description_of_Business_and_Ba3

Description of Business and Basis of Presentation - Additional Information (Detail)

3 Months Ended

9 Months Ended

3 Months Ended

9 Months Ended

3 Months Ended

9 Months Ended

3 Months Ended

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3 Months Ended

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9 Months Ended

3 Months Ended

9 Months Ended

In Thousands, except Per Share data, unless otherwise specified

Sep. 30, 2014

Jun. 30, 2014

Sep. 30, 2013

Sep. 30, 2014

Sep. 30, 2013

Dec. 31, 2013

Sep. 30, 2014

Sep. 30, 2013

Sep. 30, 2014

Sep. 30, 2013

Dec. 31, 2013

Sep. 30, 2014

Sep. 30, 2013

Sep. 30, 2014

Sep. 30, 2013

Sep. 30, 2014

Sep. 30, 2014

Sep. 30, 2014

Sep. 30, 2014

Nov. 04, 2014

Sep. 30, 2014

Sep. 30, 2014

Sep. 30, 2013

Sep. 30, 2013

Sep. 30, 2014

Sep. 30, 2014

Sep. 30, 2013

Sep. 30, 2013

Sep. 30, 2014

Sep. 30, 2014

Sep. 30, 2014

Sep. 30, 2013

Sep. 30, 2014

Sep. 30, 2013

Sep. 30, 2014

Sep. 30, 2013

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Sep. 30, 2014

Sep. 30, 2013

Sep. 30, 2014

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USD ($)

USD ($)

USD ($)

USD ($)

USD ($)

USD ($)

PJM [Member]

PJM [Member]

PJM [Member]

PJM [Member]

PJM [Member]

International Customers [Member]

International Customers [Member]

International Customers [Member]

International Customers [Member]

Entelios AG [Member]

Entech US and Entech UK [Member]

Entech India [Member]

July 5, 2012 Lease [Member]

Subsequent Event [Member]

Australian Subsidiary [Member]

Australian Subsidiary [Member]

Australian Subsidiary [Member]

Australian Subsidiary [Member]

Australian Subsidiary [Member]

Australian Subsidiary [Member]

Australian Subsidiary [Member]

Australian Subsidiary [Member]

German Subsidiary [Member]

U K Subsidiary [Member]

Demand Response Equipment [Member]

Demand Response Equipment [Member]

Demand Response Equipment [Member]

Demand Response Equipment [Member]

Enterprise EIS and Solutions Revenues [Member]

Enterprise EIS and Solutions Revenues [Member]

Enterprise EIS and Solutions Revenues [Member]

Enterprise EIS and Solutions Revenues [Member]

Software Development Costs [Member]

Software Development Costs [Member]

Software Development Costs [Member]

Software Development Costs [Member]

Software Development Costs [Member]

USD ($)

USD ($)

USD ($)

USD ($)

USD ($)

USD ($)

USD ($)

USD ($)

USD ($)

World Energy Solutions, Inc. [Member]

USD ($)

AUD

USD ($)

AUD

USD ($)

AUD

USD ($)

AUD

USD ($)

USD ($)

USD ($)

USD ($)

USD ($)

USD ($)

USD ($)

USD ($)

USD ($)

USD ($)

USD ($)

USD ($)

USD ($)

USD ($)

USD ($)

USD ($)

Description Of Business And Basis Of Presentation [Line Items]

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

Target customers for EIS and related solutions enterprises spend amount

'

'

'

$100,000

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

Increase in operator revenue and cost of revenue

4,344

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

Date of acquisition

'

'

'

2-Apr-14

'

'

'

'

'

'

'

'

'

'

'

13-Feb-14

17-Apr-14

9-May-14

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

Ownership interest

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

50.00%

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

Lease commencement date

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

1-Jan-15

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

Lease expiration date

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

31-Jul-20

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

Common stock, par value

$0.00

'

'

$0.00

'

$0.00

'

'

'

'

'

'

'

'

'

'

'

'

'

$0.00

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

Offer price

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

$5.50

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

Purchase price consideration

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

76,000

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

Revenue reserves

475

'

'

475

'

475

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

Demand response revenues

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

318,629

267,376

396,057

318,362

'

'

'

'

'

'

'

'

'

Demand delivery revenues

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

960

1,597

4,546

5,920

'

'

'

'

'

Unbilled revenues

'

'

'

'

'

'

155,102

'

155,102

'

64,643

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

Revenue recognized

'

4,344

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

Related cost of revenues

'

1,982

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

Energy event revenues

1,352

'

19,281

26,121

23,440

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

Revenue recognized related to net settlement transactions

3,523

'

'

11,325

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

(Expense) income arising from transactions denominated in foreign currencies

-2,459

'

167

-1,825

-1,156

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

Intercompany receivable from subsidiary

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

146

182

333

375

6,447

6,881

12,142

11,796

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

Realized gain (loss) form intercompany receivable

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

54

'

660

'

402

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

Intercompany receivable from subsidiary

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

9,464

10,836

'

'

9,464

10,836

'

'

21,132

4,481

'

'

'

'

'

'

'

'

'

'

'

'

'

Intercompany funding deemed as long-term investment

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

21,671

20,364

'

'

21,671

20,364

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

Translation adjustments

-1,572

'

55

-678

-987

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

-1,385

'

'

'

-389

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

Capitalized software development costs

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

1,507

1,523

4,648

5,835

'

Amortization of capitalized software development costs

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

1,547

1,434

4,573

4,186

'

Accumulated amortization of capitalized software development costs

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

26,014

'

26,014

'

21,441

Impairment charges of property and equipment

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

175

'

527

'

'

'

'

'

'

'

'

'

'

Carrying value of impaired long-lived assets

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

0

'

0

'

'

'

'

'

'

'

'

'

'

Revenues based upon customer location

$329,422

'

$278,473

$425,985

$347,476

'

$225,155

$171,377

$246,367

$173,252

'

$57,739

$52,908

$80,471

$66,952

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

Description_of_Business_and_Ba4

Description of Business and Basis of Presentation - Percentage of Total Revenues (Detail)	3 Months Ended		9 Months Ended
	Sep. 30, 2014	Sep. 30, 2013	Sep. 30, 2014	Sep. 30, 2013
Segment Reporting Information [Line Items]	'	'	'	'
Percentage of total revenues	100.00%	100.00%	100.00%	100.00%
United States [Member]	'	'	'	'
Segment Reporting Information [Line Items]	'	'	'	'
Percentage of total revenues	82.00%	81.00%	81.00%	81.00%
Australia [Member]	'	'	'	'
Segment Reporting Information [Line Items]	'	'	'	'
Percentage of total revenues	13.00%	16.00%	12.00%	14.00%
All Other [Member]	'	'	'	'
Segment Reporting Information [Line Items]	'	'	'	'
Percentage of total revenues	5.00%	3.00%	7.00%	5.00%

Acquisitions_Additional_Inform

Acquisitions - Additional Information (Detail)

9 Months Ended

9 Months Ended

0 Months Ended

9 Months Ended

0 Months Ended

9 Months Ended

0 Months Ended

9 Months Ended

9 Months Ended

0 Months Ended

3 Months Ended

9 Months Ended

9 Months Ended

0 Months Ended

3 Months Ended

9 Months Ended

3 Months Ended

9 Months Ended

0 Months Ended

In Thousands, unless otherwise specified

Sep. 30, 2014

Dec. 31, 2013

Sep. 30, 2014

Sep. 30, 2014

Apr. 17, 2014

Sep. 30, 2014

Jun. 30, 2014

9-May-14

Apr. 17, 2014

9-May-14

Sep. 30, 2014

9-May-14

Feb. 13, 2014

Feb. 13, 2014

Sep. 30, 2014

Feb. 13, 2014

Feb. 13, 2014

Sep. 30, 2014

Sep. 30, 2014

Sep. 30, 2014

Sep. 30, 2014

Sep. 30, 2014

Sep. 30, 2014

Feb. 13, 2014

Feb. 13, 2014

Sep. 30, 2014

Sep. 30, 2014

Sep. 30, 2014

Sep. 30, 2014

Jun. 30, 2014

Feb. 13, 2014

Feb. 13, 2014

Sep. 30, 2014

Sep. 30, 2014

Sep. 30, 2014

Sep. 30, 2014

Sep. 30, 2014

Sep. 30, 2014

Apr. 02, 2014

Sep. 30, 2014

Jun. 30, 2014

Sep. 30, 2014

Apr. 02, 2014

Sep. 30, 2014

Sep. 30, 2014

Sep. 30, 2014

Apr. 17, 2014

Sep. 30, 2014

Jun. 30, 2014

USD ($)

USD ($)

Developed Technology [Member]

Trade Name [Member]

Entech Us Member

Entech Us Member

Entech Us Member

Entech Us Member

Entech Us Member

Entech India [Member]

Entech India [Member]

Entech India [Member]

Entelios AG [Member]

Entelios AG [Member]

Entelios AG [Member]

Entelios AG [Member]

Entelios AG [Member]

Entelios AG [Member]

Entelios AG [Member]

Entelios AG [Member]

Entelios AG [Member]

Entelios AG [Member]

Entelios AG [Member]

Activation Energy DSU Limited [Member]

Activation Energy DSU Limited [Member]

Activation Energy DSU Limited [Member]

Activation Energy DSU Limited [Member]

Activation Energy DSU Limited [Member]

Activation Energy DSU Limited [Member]

Activation Energy DSU Limited [Member]

Activation Energy DSU Limited [Member]

Activation Energy DSU Limited [Member]

Activation Energy DSU Limited [Member]

Activation Energy DSU Limited [Member]

Activation Energy DSU Limited [Member]

Activation Energy DSU Limited [Member]

Activation Energy DSU Limited [Member]

Activation Energy DSU Limited [Member]

Other Immaterial Acquisition [Member]

Other Immaterial Acquisition [Member]

Other Immaterial Acquisition [Member]

Other Immaterial Acquisition [Member]

Other Immaterial Acquisition [Member]

Entech [Member]

Entech [Member]

Entech [Member]

Entech UK Member

Entech UK Member

Entech UK Member

USD ($)

USD ($)

USD ($)

USD ($)

USD ($)

USD ($)

EUR (€)

USD ($)

USD ($)

EUR (€)

Minimum [Member]

Maximum [Member]

December 31, 2014 [Member]

December 31, 2014 [Member]

December 31, 2015 [Member]

December 31, 2015 [Member]

USD ($)

EUR (€)

USD ($)

EUR (€)

USD ($)

EUR (€)

USD ($)

USD ($)

EUR (€)

Minimum [Member]

Maximum [Member]

December 31, 2014 [Member]

December 31, 2014 [Member]

December 31, 2015 [Member]

December 31, 2015 [Member]

USD ($)

USD ($)

USD ($)

USD ($)

USD ($)

USD ($)

Initial Purchase Price [Member]

Final Purchase Price [Member]

USD ($)

USD ($)

USD ($)

USD ($)

EUR (€)

USD ($)

EUR (€)

USD ($)

EUR (€)

USD ($)

EUR (€)

USD ($)

USD ($)

Business Acquisition [Line Items]

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

Acquisition date

2-Apr-14

'

'

'

'

17-Apr-14

'

'

'

'

9-May-14

'

'

'

13-Feb-14

'

'

'

'

'

'

'

'

'

'

'

'

13-Feb-14

13-Feb-14

'

'

'

'

'

'

'

'

'

'

'

'

2-Apr-14

'

'

'

'

'

'

'

Ownership acquired in joint venture

'

'

'

'

'

'

'

50.00%

50.00%

'

50.00%

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

Aggregate purchase price

'

'

'

'

$6,796

'

'

'

'

$1,201

'

'

$21,784

€ 16,000

'

'

'

'

'

'

'

'

'

$3,844

€ 2,823

'

'

'

'

'

'

'

'

'

'

'

'

'

$250

'

'

'

'

'

$12,616

$12,547

$3,154

'

'

Business acquisition, cash paid

'

'

'

'

60

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

18

'

'

Additional purchase price paid for working capital acquired

'

'

'

'

'

'

1,007

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

458

Contingent consideration working capital adjustments

'

'

'

'

'

1,323

'

'

'

'

'

0

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

732

538

'

'

'

'

'

'

'

'

'

'

470

'

'

'

'

73

'

Direct acquisition fees and expenses

'

'

'

'

'

'

'

'

'

'

'

'

'

'

511

'

'

'

'

'

'

'

'

'

'

159

'

159

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

311

'

'

'

'

'

Accrued expenses and other current liabilities

'

'

'

'

'

'

'

'

'

'

'

'

'

'

1,098

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

526

'

'

'

79

'

Discount rate

16.00%

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

12.00%

17.00%

'

'

'

'

'

'

'

'

'

'

'

'

'

17.00%

20.00%

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

Royalty rate for definite-lived intangible assets

'

'

2.50%

1.50%

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

Closing price of outstanding debt obligations

'

'

'

'

'

'

'

'

'

'

'

'

6,884

5,056

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

Maximum contingent purchase price consideration related to an earn-out amount

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

2,042

1,500

'

'

817

600

1,225

900

'

'

'

'

'

'

'

1,398

1,027

'

'

350

257

1,048

770

'

'

'

'

1,750

'

'

'

'

'

'

Fair value of cash consideration

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

95

'

'

'

'

'

'

'

'

'

'

'

'

'

'

300

'

'

'

'

'

'

'

'

'

'

'

175

'

'

'

'

'

'

Fair value aggregate purchase price

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

21,879

'

'

'

'

'

'

'

'

'

'

'

'

'

'

4,876

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

Liability after adjusting for changes in exchange rates

'

'

'

'

'

'

'

'

'

'

'

'

'

'

102

'

'

'

'

'

'

'

'

'

'

451

'

451

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

Potential cash payment

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

127

100

127

100

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

Earn-out payments

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

1,398

1,027

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

Goodwill deducted and expected to be deductible

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

15

'

'

'

'

'

'

'

'

'

0

'

0

'

'

'

'

'

'

'

Deferred acquisition consideration

832

566

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

125

'

'

'

'

'

'

Deferred contingent consideration payment period

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'18 months

'

'

'

'

'

'

'

Fair value of accretion expenses

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

75

'

'

'

'

'

'

'

'

Earn-out payment consideration percentage

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

50.00%

'

'

'

'

'

'

'

'

Deferred contingent consideration percentage

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

50.00%

'

'

'

'

'

'

'

'

Earn-out payments accounted as compensation arrangements

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

1,500

'

'

'

'

'

'

'

'

'

'

Business acquisition potential earn-out payments

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

500

'

'

'

'

'

'

'

'

'

'

Increase in fair value of contingent consideration

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

66

'

137

'

'

'

'

'

'

'

Reduction in working capital adjustment

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

6

'

'

'

'

'

'

'

'

'

'

Business acquisition purchase price

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

889

'

'

'

'

'

'

'

'

'

'

Net tangible assets acquired

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

476

'

'

'

'

'

'

Goodwill acquired

100,427

77,104

'

'

'

'

'

'

'

'

'

'

'

'

15,653

'

'

'

'

'

'

'

'

'

'

1,581

'

1,581

'

'

'

'

'

'

'

'

'

'

'

'

'

'

413

7,168

'

'

'

'

'

Business acquisition identifiable intangible assets

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

$0

'

'

'

'

'

'

Acquisitions_Components_and_Pr

Acquisitions - Components and Preliminary Allocation of Purchase Price (Detail) (USD $)	Sep. 30, 2014	Dec. 31, 2013
In Thousands, unless otherwise specified
Business Acquisition [Line Items]	'	'
Goodwill	$100,427	$77,104
Entelios AG [Member]	'	'
Business Acquisition [Line Items]	'	'
Net tangible assets acquired	-50	'
Customer relationships	4,084	'
Non-compete agreements	204	'
Developed technology	1,770	'
Trade name	218	'
Deferred income tax asset	2,070	'
Deferred income tax liability	-2,070	'
Goodwill	15,653	'
Total	21,879	'
Activation Energy DSU Limited [Member]	'	'
Business Acquisition [Line Items]	'	'
Net tangible assets acquired	752	'
Customer relationships	2,042	'
Non-compete agreements	220	'
Developed technology	545	'
Trade name	82	'
Deferred income tax liability	-361	'
Goodwill	1,581	'
Total	4,861	'
Entech [Member]	'	'
Business Acquisition [Line Items]	'	'
Net tangible assets acquired	1,208	'
Customer relationships	3,900	'
Non-compete agreements	1,000	'
Developed technology	700	'
Trade name	260	'
Deferred income tax liability	-1,689	'
Goodwill	7,168	'
Total	$12,547	'

Acquisitions_Schedule_of_Net_T

Acquisitions - Schedule of Net Tangible Assets and Liabilities Acquired (Detail) (USD $)	Sep. 30, 2014	Dec. 31, 2013
In Thousands, unless otherwise specified
Business Acquisition [Line Items]	'	'
Capitalized incremental direct customer contract costs	$6,955	$9,509
Accrued payroll and related expenses	-16,268	-13,370
Accrued expenses and other current liabilities	-30,074	-10,145
Accrued capacity payments	-126,084	-76,676
Deferred revenues	-7,623	-6,819
Deferred revenues	-13,143	-20,625
Entelios AG [Member]	'	'
Business Acquisition [Line Items]	'	'
Cash	1,564	'
Accounts receivable	19	'
Capitalized incremental direct customer contract costs	36	'
Prepaid expenses and other current assets	148	'
Property and equipment	377	'
Other assets	72	'
Accounts payable	-178	'
Accrued payroll and related expenses	-970	'
Accrued expenses and other liabilities	-1,098	'
Deferred revenues	-20	'
Total	-50	'
Activation Energy DSU Limited [Member]	'	'
Business Acquisition [Line Items]	'	'
Cash	711	'
Accounts receivable	472	'
Prepaid expenses and other current assets	27	'
Property and equipment	92	'
Accounts payable	-45	'
Accrued expenses and other current liabilities	-55	'
Accrued capacity payments	-450	'
Total	752	'
Entech [Member]	'	'
Business Acquisition [Line Items]	'	'
Cash	530	'
Accounts receivable	1,537	'
Property and equipment	275	'
Other assets	242	'
Accounts payable	-138	'
Accrued payroll and related expenses	-311	'
Accrued expenses and other liabilities	-526	'
Deferred revenues	-63	'
Deferred tax liability	-10	'
Other long-term liabilities	-328	'
Total	$1,208	'

Japan_Joint_Venture_Additional

Japan Joint Venture - Additional Information (Detail) (USD $)	9 Months Ended
In Thousands, unless otherwise specified	Sep. 30, 2014
EnerNoc [Member]	'
Investment In Joint Venture [Line Items]	'
Initial capital contribution	$580
Percentage of ownership	60.00%
Japan Joint Venture [Member] | Marubeni Corporation [Member]	'
Investment In Joint Venture [Line Items]	'
Joint venture date	10-Dec-13
Initial capital contribution	$392

Investments_Additional_Informa

Investments - Additional Information (Detail) (USD $)	1 Months Ended		9 Months Ended					3 Months Ended	9 Months Ended
	Sep. 30, 2014	Feb. 28, 2014	Sep. 30, 2014	Sep. 30, 2013	Sep. 30, 2014	Aug. 31, 2014	Aug. 12, 2014	Sep. 30, 2014	Sep. 30, 2014	Feb. 28, 2014	Sep. 30, 2014
					Convertible Promissory Notes [Member]	Convertible Promissory Notes [Member]	Convertible Debt Securities [Member]	Technology Equipment [Member]	Technology Equipment [Member]	Technology Equipment [Member]	Technology Equipment [Member]
											Maximum [Member]
Schedule of Cost-method Investments [Line Items]	'	'	'	'	'	'	'	'	'	'	'
Purchase price	'	$1,000,000	'	'	'	$1,500,000	'	'	'	'	'
Fair value of investment	'	1,000,000	'	'	'	1,500,000	'	'	'	'	'
Fees paid related to acquisition of a perpetual software license	'	2,000,000	'	'	'	'	'	'	'	'	'
Fair value of license obtained	'	'	'	'	'	'	'	'	'	2,000,000	'
Estimated useful life	'	'	'	'	'	'	'	'	'3 years	'	'
Future revenues from licensing of developed software technology	'	'	'	'	'	'	'	'	'	'	2,000,000
Depreciation expense	'	'	16,414,000	15,356,000	'	'	'	166,000	444,000	'	'
Interest rate of Convertible promissory note	'	'	'	'	5.00%	'	'	'	'	'	'
Maturity date	'	'	'	'	31-Dec-15	'	'	'	'	'	'
Amortized cost of investment	1,500,000	'	1,500,000	'	'	'	'	'	'	'	'
Estimated fair value	1,500,000	'	1,500,000	'	'	'	1,500,000	'	'	'	'
Expense associated with partnering agreement	$0	'	'	'	'	'	'	'	'	'	'

Intangible_Assets_and_Goodwill2

Intangible Assets and Goodwill - Summary of Gross Carrying Amount and Accumulated Amortization of Definite-Lived Intangible Assets (Detail) (USD $)	9 Months Ended
In Thousands, unless otherwise specified	Sep. 30, 2014	Dec. 31, 2013
Finite-Lived Intangible Assets [Line Items]	'	'
Weighted Average Amortization Period (in years)	'3 years 1 month 6 days	'
Gross Carrying Amount	$52,304	$39,378
Accumulated Amortization	-27,537	-22,192
Customer Relationships [Member]	'	'
Finite-Lived Intangible Assets [Line Items]	'	'
Weighted Average Amortization Period (in years)	'3 years 7 months 17 days	'
Gross Carrying Amount	37,908	29,663
Accumulated Amortization	-18,608	-15,416
Customer Contracts [Member]	'	'
Finite-Lived Intangible Assets [Line Items]	'	'
Weighted Average Amortization Period (in years)	'2 years 4 months 13 days	'
Gross Carrying Amount	4,953	4,887
Accumulated Amortization	-3,483	-2,900
Employment Agreements and Non-Compete Agreements [Member]	'	'
Finite-Lived Intangible Assets [Line Items]	'	'
Weighted Average Amortization Period (in years)	'1 year 2 months 19 days	'
Gross Carrying Amount	2,650	1,676
Accumulated Amortization	-1,669	-1,475
Software [Member]	'	'
Finite-Lived Intangible Assets [Line Items]	'	'
Gross Carrying Amount	120	120
Accumulated Amortization	-120	-120
Developed Technology [Member]	'	'
Finite-Lived Intangible Assets [Line Items]	'	'
Weighted Average Amortization Period (in years)	'1 year 5 months 9 days	'
Gross Carrying Amount	5,393	2,277
Accumulated Amortization	-2,889	-1,758
Trade Name [Member]	'	'
Finite-Lived Intangible Assets [Line Items]	'	'
Weighted Average Amortization Period (in years)	'9 months 15 days	'
Gross Carrying Amount	1,100	575
Accumulated Amortization	-687	-455
Patents [Member]	'	'
Finite-Lived Intangible Assets [Line Items]	'	'
Weighted Average Amortization Period (in years)	'5 years 4 months 21 days	'
Gross Carrying Amount	180	180
Accumulated Amortization	-81	-68
Total Other Definite-Lived Intangible Assets [Member]	'	'
Finite-Lived Intangible Assets [Line Items]	'	'
Gross Carrying Amount	14,396	9,715
Accumulated Amortization	($8,929)	($6,776)

Intangible_Assets_and_Goodwill3

Intangible Assets and Goodwill - Additional Information (Detail) (USD $)	3 Months Ended		9 Months Ended
In Thousands, unless otherwise specified	Sep. 30, 2014	Sep. 30, 2013	Sep. 30, 2014	Sep. 30, 2013	Mar. 31, 2014	Nov. 30, 2013
Finite-Lived Intangible Assets [Line Items]	'	'	'	'	'	'
Purchase price of intangible assets	'	'	'	'	$403	'
Impairment charges	'	'	323	'	'	'
Amortization expenses of intangible assets	2,391	1,703	6,753	5,260	'	'
Intangible asset estimated useful lives	'	'	'3 years 1 month 6 days	'	'	'
Estimated amortization, 2014	2,281	'	2,281	'	'	'
Estimated amortization, 2015	7,459	'	7,459	'	'	'
Estimated amortization, 2016	5,666	'	5,666	'	'	'
Estimated amortization, 2017	3,952	'	3,952	'	'	'
Estimated amortization, 2018	1,568	'	1,568	'	'	'
Estimated amortization, thereafter	3,841	'	3,841	'	'	'
Percentage of market capitalization exceeds the consolidated net assets	100.00%	'	100.00%	'	'	'
Percentage excess of fair value of reporting unit over its book value of its net assets	'	'	'	'	'	50.00%
Maximum [Member]	'	'	'	'	'	'
Finite-Lived Intangible Assets [Line Items]	'	'	'	'	'	'
Intangible asset estimated useful lives	'	'	'10 years	'	'	'
Minimum [Member]	'	'	'	'	'	'
Finite-Lived Intangible Assets [Line Items]	'	'	'	'	'	'
Intangible asset estimated useful lives	'	'	'1 year	'	'	'
Developed Technology [Member]	'	'	'	'	'	'
Finite-Lived Intangible Assets [Line Items]	'	'	'	'	'	'
Amortization expenses of intangible assets	515	138	1,482	416	'	'
Intangible asset estimated useful lives	'	'	'1 year 5 months 9 days	'	'	'
Finite-Lived Intangible Assets [Member]	'	'	'	'	'	'
Finite-Lived Intangible Assets [Line Items]	'	'	'	'	'	'
Carrying value of impairment long-lived assets	$0	'	$0	'	'	'

Intangible_Assets_and_Goodwill4

Intangible Assets and Goodwill - Schedule of Change in Carrying Amount of Goodwill (Detail) (USD $)	9 Months Ended
In Thousands, unless otherwise specified	Sep. 30, 2014
Goodwill and Intangible Assets Disclosure [Abstract]	'
Balance at December 31, 2013	$77,104
Acquisitions	24,815
Foreign currency translation	-1,492
Balance at September 30, 2014	$100,427

Net_lncome_Per_Share_A_reconci

Net lncome Per Share - A reconciliation of net income to the adjusted net income utilized in the calculation of net income per share (Detail) (USD $)	3 Months Ended		9 Months Ended
In Thousands, unless otherwise specified	Sep. 30, 2014	Sep. 30, 2013	Sep. 30, 2014	Sep. 30, 2013
Net Income Loss Reconciliation [Line Items]	'	'	'	'
Net income attributable to EnerNOC, Inc.	$96,673	$106,857	$38,875	$41,969
Adjusted net income attributable to EnerNOC, Inc.	97,653	106,857	39,855	41,969
Convertible Notes [Member]	'	'	'	'
Net Income Loss Reconciliation [Line Items]	'	'	'	'
ADD: Interest expense related to convertible notes	$980	'	$980	'

Net_Income_Per_Share_Reconcili

Net Income Per Share - Reconciliation of Basic and Diluted Share Amounts (Detail)	3 Months Ended		9 Months Ended
	Sep. 30, 2014	Sep. 30, 2013	Sep. 30, 2014	Sep. 30, 2013
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items]	'	'	'	'
Basic weighted average common shares outstanding	27,795,154	27,920,409	28,075,291	27,693,054
Weighted average common stock equivalents	877,000	923,000	1,068,000	924,000
Incremental shares from assumed conversion of convertible notes	2,762,000	'	931,000	'
Diluted weighted average common shares outstanding	31,434,164	28,843,010	30,074,187	28,616,552
Stock Options [Member]	'	'	'	'
Weighted average anti-dilutive shares related to:	'	'	'	'
Weighted average anti-dilutive shares	2,000	'	5,000	1,000
Nonvested Restricted Shares [Member]	'	'	'	'
Weighted average anti-dilutive shares related to:	'	'	'	'
Weighted average anti-dilutive shares	92,000	54,000	384,000	336,000
Restricted Stock Units [Member]	'	'	'	'
Weighted average anti-dilutive shares related to:	'	'	'	'
Weighted average anti-dilutive shares	7,000	'	10,000	9,000

Net_Income_Per_Share_Additiona

Net Income Per Share - Additional Information (Detail)	0 Months Ended	9 Months Ended
	Sep. 30, 2014	Sep. 30, 2014
		M2M Communications Corporation [Member]
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items]	'	'
Number of common stock, shares released from escrow	0	'
Shares to be issued related to deferred consideration arrangement related to a business combination	'	254,654

Disclosure_of_Fair_Value_of_Fi1

Disclosure of Fair Value of Financial Instruments - Additional Information (Detail) (USD $)	Sep. 30, 2014	Dec. 31, 2013
In Thousands, unless otherwise specified
Fair Value Disclosures [Abstract]	'	'
Outstanding debt obligations	$160,000	$0
Fair value of debt instruments	$137,907	'

Fair_Value_Measurements_Assets

Fair Value Measurements - Assets and Liabilities Measured at Fair Value on Recurring Basis (Detail) (USD $)	Sep. 30, 2014	Dec. 31, 2013
In Thousands, unless otherwise specified
Assets:	'	'
Money market funds	$220,051	$146,626
Available for sale convertible debt instrument	1,500	'
Liabilities:	'	'
Accrued contingent purchase price consideration	553	'
Deferred acquisition consideration	832	566
Fair Value Measurement, Recurring [Member] | Quoted Prices in Active Markets for Identical Assets (Level 1) [Member]	'	'
Assets:	'	'
Money market funds	220,051	146,626
Available for sale convertible debt instrument	'	'
Liabilities:	'	'
Accrued contingent purchase price consideration	'	'
Deferred acquisition consideration	'	'
Fair Value Measurement, Recurring [Member] | Significant Other Observable Inputs (Level 2) [Member]	'	'
Assets:	'	'
Money market funds	'	'
Available for sale convertible debt instrument	'	'
Liabilities:	'	'
Accrued contingent purchase price consideration	'	'
Deferred acquisition consideration	'	'
Fair Value Measurement, Recurring [Member] | Unobservable Inputs (Level 3) [Member]	'	'
Assets:	'	'
Money market funds	'	'
Available for sale convertible debt instrument	1,500	'
Liabilities:	'	'
Accrued contingent purchase price consideration	553	'
Deferred acquisition consideration	$832	$566

Fair_Value_Measurements_Assets1

Fair Value Measurements - Assets and Liabilities Measured at Fair Value on Recurring Basis (Parenthetical) (Detail) (USD $)	9 Months Ended	12 Months Ended
In Thousands, unless otherwise specified	Sep. 30, 2014	Dec. 31, 2013
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]	'	'
Money market funds	$220,051	$146,626
Time value of money before increase in fair value	89	'
Increase in fair value of liabilities	'	33
Other Immaterial Acquisition [Member]	'	'
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]	'	'
Increase in fair value of earn-out	202	'
Cash and Cash Equivalents [Member]	'	'
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]	'	'
Money market funds	219,871	145,076
Restricted Cash [Member]	'	'
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]	'	'
Money market funds	$180	$1,550

Borrowings_and_Credit_Arrangem2

Borrowings and Credit Arrangements - Additional Information (Detail) (USD $)

Sep. 30, 2014

Sep. 30, 2014

Sep. 30, 2014

Aug. 11, 2014

Apr. 18, 2013

Sep. 30, 2014

Aug. 11, 2014

Aug. 11, 2014

Aug. 11, 2014

Sep. 30, 2014

Aug. 11, 2014

Aug. 11, 2014

Aug. 18, 2014

Sep. 30, 2014

Aug. 18, 2014

Aug. 12, 2014

Sep. 30, 2014

Sep. 30, 2014

Sep. 30, 2014

Mar. 31, 2012

Mar. 31, 2012

Credit Facility 2013 [Member]

Credit Facility 2013 [Member]

Credit Facility 2013 [Member]

Credit Facility 2013 [Member]

2014 Credit Facility [Member]

2014 Credit Facility [Member]

2014 Credit Facility [Member]

Maximum [Member]

Subsequent Event [Member]

London Interbank Offered Rate (LIBOR) [Member]

Prime Rate [Member]

2.25% Convertible Senior Notes Due 2019 [Member]

2.25% Convertible Senior Notes Due 2019 [Member]

2.25% Convertible Senior Notes Due 2019 [Member]

2.25% Convertible Senior Notes Due 2019 [Member]

2.25% Convertible Senior Notes Due 2019 [Member]

2.25% Convertible Senior Notes Due 2019 [Member]

2.25% Convertible Senior Notes Due 2019 [Member]

Credit Facility 2012 [Member]

Credit Facility 2012 [Member]

Silicon Valley Bank [Member]

Silicon Valley Bank [Member]

Revolving Credit Facility [Member]

Silicon Valley Bank [Member]

Silicon Valley Bank [Member]

2014 Credit Facility [Member]

2014 Credit Facility [Member]

Trading_day

Senior Notes Liability Component [Member]

Senior Notes Equity Component [Member]

Maximum [Member]

Silicon Valley Bank [Member]

Silicon Valley Bank [Member]

Silicon Valley Bank [Member]

Line of Credit Facility [Line Items]

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

Aggregate principal amount of debt

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

$160,000,000

'

'

'

'

'

Debt instrument stated interest rate

2.25%

'

'

'

'

'

'

'

'

'

'

'

'

'

'

2.25%

'

'

'

'

'

Proceeds from convertible debt offering

'

'

'

'

'

'

'

'

'

'

'

'

155,278,000

'

'

'

'

'

'

'

'

Underwriters' discount

'

'

'

'

'

'

'

'

'

'

'

'

4,000,000

'

'

'

'

'

'

'

'

Debt issuance costs allocated

'

'

'

'

'

'

'

'

'

'

'

'

722,000

'

'

'

'

'

'

'

'

Repurchase of common stock, value

'

'

'

'

'

'

'

'

'

'

'

'

30,000,000

'

'

'

'

'

'

'

'

Repurchase of common stock, shares

'

'

'

'

'

'

'

'

'

'

'

'

1,514,552

'

'

'

'

'

'

'

'

Repurchase of common stock, price per share

'

'

'

'

'

'

'

'

'

'

'

'

$19.79

'

'

'

'

'

'

'

'

Debt instrument, interest rate terms

'

'

'

'

'

'

'

'

'

'

'

'

'

'Interest on the Notes will be payable semi-annually in cash in arrears on February 15 and August 15 of each year, beginning on February 15, 2015, at a rate of 2.25% per year.

'

'

'

'

'

'

'

Debt Instrument, maturity date

'

'

'

'

'

'

'

'

'

'

'

'

'

15-Aug-19

'

'

'

'

'

'

'

Debt instrument, initial conversion rate

'

'

'

'

'

'

'

'

'

'

'

'

'

36.0933

'

'

'

'

'

'

'

Debt instrument, principal amount of conversion

'

'

'

'

'

'

'

'

'

'

'

'

'

1,000,000

'

'

'

'

'

'

'

Debt instrument, initial conversion price per share

'

'

'

'

'

'

'

'

'

'

'

'

'

$27.71

'

'

'

'

'

'

'

Last date for converting convertible notes

'

'

'

'

'

'

'

'

'

'

'

'

'

15-Feb-19

'

'

'

'

'

'

'

Trading period to trigger conversion feature

'

'

'

'

'

'

'

'

'

'

'

'

'

20

'

'

'

'

'

'

'

Consecutive trading period to trigger conversion feature

'

'

'

'

'

'

'

'

'

'

'

'

'

'30 days

'

'

'

'

'

'

'

Minimum percentage of common stock price to conversion price

'

'

'

'

'

'

'

'

'

'

'

'

'

130.00%

'

'

'

'

'

'

'

Down ceiling of trading price to conversion rate of convertible notes

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

98.00%

'

'

Sinking fund

'

'

'

'

'

'

'

'

'

'

'

'

'

0

'

'

'

'

'

'

'

Repurchase price of principal amount of the convertible notes

'

'

'

'

'

'

'

'

'

'

'

'

'

100.00%

'

'

'

'

'

'

'

Debt instrument liability component

'

'

'

'

'

'

'

'

'

'

'

'

'

'

137,430,000

'

'

'

'

'

'

Debt instrument, effective interest rate

'

'

'

'

'

'

'

'

'

'

'

'

'

'

6.14%

'

'

'

'

'

'

Debt instrument equity component

'

'

'

'

'

'

'

'

'

'

'

'

'

22,566,000

'

'

'

'

'

'

'

Amortization period for interest expenses

'

'

'

'

'

'

'

'

'

'

'

'

'

'5 years

'

'

'

'

'

'

'

Debt issuance, transaction cost allocated

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

4,056,000

666,000

'

'

'

Prepaid expense and other current assets

'

'

'

'

'

'

'

'

'

'

'

'

'

670,000

'

'

'

'

'

'

'

deposit and other assets

'

'

'

'

'

'

'

'

'

'

'

'

'

3,310,000

'

'

'

'

'

'

'

Borrowing limit

'

'

'

'

'

'

'

30,000,000

'

'

'

'

'

'

'

'

'

'

'

'

50,000,000

2013 Credit facility, termination date

'

'

11-Aug-14

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

12-Apr-13

'

Letter of credit

'

'

'

'

70,000,000

'

'

30,000,000

'

'

'

'

'

'

'

'

'

'

'

'

'

Letter of credit outstanding amount

'

13,409,000

'

0

'

13,409,000

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

Deferred financing costs

'

'

376,000

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

LIBOR rate descriptions

'

'

'

'

'

'The interest on revolving loans under the 2014 credit facility will accrue, at the Companybs election, at either (i)B the LIBOR (determined based on the per annum rate of interest at which deposits in United States Dollars are offered to SVB in the London interbank market) plus 2.00%, or (ii)B the bprime rateb as quoted in the Wall Street Journal with respect to the relevant interest period plus 1.00%.

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

LIBOR rate, percentage

'

'

'

'

'

'

'

'

'

'

2.00%

1.00%

'

'

'

'

'

'

'

'

'

Unused portion of revoloving loan fee percentage

'

'

'

'

'

'

0.25%

'

'

'

'

'

'

'

'

'

'

'

'

'

'

Letter of credit fee percentage

'

'

'

'

'

'

1.50%

'

'

'

'

'

'

'

'

'

'

'

'

'

'

Letter of credit, due date

'

'

'

'

'

'

11-Aug-15

'

'

'

'

'

'

'

'

'

'

'

'

'

'

Letter of credit percentage on face amount

'

'

'

'

'

'

'

'

105.00%

'

'

'

'

'

'

'

'

'

'

'

'

Borrowing under letter of credit

0

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

Issuances of additional letters of credit

'

'

'

'

'

16,591,000

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

Issuance of additional letters of credit

'

'

'

'

'

'

'

'

'

$5,079,000

'

'

'

'

'

'

'

'

'

'

'

Borrowings_and_Credit_Arrangem3

Borrowings and Credit Arrangements - Summary of Interest Expense (Detail) (2.25% Convertible Senior Notes Due 2019 [Member], USD $)	3 Months Ended		9 Months Ended
In Thousands, unless otherwise specified	Sep. 30, 2014	Sep. 30, 2013	Sep. 30, 2014	Sep. 30, 2013
2.25% Convertible Senior Notes Due 2019 [Member]	'	'	'	'
Debt Instrument [Line Items]	'	'	'	'
Amortization of debt discount	$474	'	$474	'
Amortization of deferred financing costs	76	'	76	'
Non-cash interest expense	550	'	550	'
2.25% accrued interest	430	'	430	'
Total	$980	'	$980	'

Borrowings_and_Credit_Arrangem4

Borrowings and Credit Arrangements - Summary of Interest Expense (Parenthetical) (Detail)	Sep. 30, 2014
Debt Disclosure [Abstract]	'
Debt instrument, percentage of accrued interest	2.25%

Commitments_and_Contingencies_1

Commitments and Contingencies - Additional Information (Detail) (USD $)	9 Months Ended
	Sep. 30, 2014	Dec. 31, 2013
Other Commitments [Line Items]	'	'
Lease term	'2020-03	'
Asset retirement obligation	$417,000	'
Terms for future minimum lease payments	'More than one year	'
Deferred rent liability	7,259,000	7,629,000
Restricted cash to secure insurance commitments	1,097,000	1,834,000
Performance guarantees	15,463,000	'
Restricted cash utilized to collateralize	1,874,000	'
Deposits held by certain customers	180,000	'
Estimated termination penalty	7,341,000	'
Deferred fees	1,027,000	'
Accrued performance adjustments	373,000	1,720,000
Period of warranty	'One year	'
Payment due upon termination	928,000	'
Fees received for potential range of loss	20,100,000	'
Fees received	658,000	'
Credit Facility 2013 [Member]	'	'
Other Commitments [Line Items]	'	'
Contingent liability under outstanding letters of credit	13,409,000	'
Electric Power Grid [Member]	'	'
Other Commitments [Line Items]	'	'
Repayment to electric power grid operator	$1,488,000	'
Minimum [Member]	'	'
Other Commitments [Line Items]	'	'
Original lease terms	'1 year	'
Maximum [Member]	'	'
Other Commitments [Line Items]	'	'
Original lease terms	'10 years	'
Massachusetts [Member]	'	'
Other Commitments [Line Items]	'	'
Lease term	'2020-07	'
Lease commencement date	31-Jul-12	'
California [Member]	'	'
Other Commitments [Line Items]	'	'
Lease term	'2019-09	'
Lease commencement date	1-Apr-14	'

Commitments_and_Contingencies_2

Commitments and Contingencies - Future Minimum Lease Payments for Operating Leases (Detail) (USD $)	Sep. 30, 2014
In Thousands, unless otherwise specified
Commitments and Contingencies Disclosure [Abstract]	'
Remainder of 2014	$1,714
2015	7,630
2016	7,894
2017	7,458
2018	7,720
Thereafter	10,584
Total minimum lease payments (not reduced by sublease rentals of $161)	$43,000

Commitments_and_Contingencies_3

Commitments and Contingencies - Future Minimum Lease Payments for Operating Leases (Parenthetical) (Detail) (USD $)	Sep. 30, 2014
In Thousands, unless otherwise specified
Commitments and Contingencies Disclosure [Abstract]	'
Sublease rental not reduced from lease payments	$161

Stockholders_Equity_Additional

Stockholders' Equity - Additional Information (Detail) (USD $)

1 Months Ended

3 Months Ended

9 Months Ended

3 Months Ended

9 Months Ended

3 Months Ended

9 Months Ended

9 Months Ended

9 Months Ended

0 Months Ended

3 Months Ended

9 Months Ended

9 Months Ended

3 Months Ended

9 Months Ended

12 Months Ended

9 Months Ended

3 Months Ended

9 Months Ended

Jul. 31, 2014

Sep. 30, 2014

Sep. 30, 2013

Sep. 30, 2014

Sep. 30, 2013

Sep. 30, 2014

Sep. 30, 2013

Sep. 30, 2014

Sep. 30, 2013

Dec. 31, 2013

Sep. 30, 2014

Sep. 30, 2013

Sep. 30, 2014

Sep. 30, 2013

Dec. 31, 2013

Sep. 30, 2014

Sep. 30, 2014

Sep. 30, 2014

Sep. 30, 2014

Jul. 31, 2014

Jul. 31, 2014

Aug. 06, 2013

Sep. 30, 2014

Sep. 30, 2014

Sep. 30, 2014

Aug. 11, 2014

Sep. 30, 2014

Sep. 30, 2014

Sep. 30, 2014

Sep. 30, 2014

Sep. 30, 2014

Sep. 30, 2014

Dec. 31, 2013

Sep. 30, 2014

Sep. 30, 2014

Sep. 30, 2014

Sep. 30, 2014

Sep. 30, 2014

Sep. 30, 2014

Restricted Stock [Member]

Restricted Stock [Member]

Restricted Stock [Member]

Restricted Stock [Member]

Restricted Stock [Member]

Restricted Stock Units [Member]

Restricted Stock Units [Member]

Restricted Stock Units [Member]

Restricted Stock Units [Member]

Restricted Stock Units [Member]

Restricted Stock and Restricted Stock Units [Member]

Restricted Stock Performance-Based Vesting Awards Probable Vesting [Member]

Restricted Stock Performance-Based Vesting Awards Not Probable Vesting [Member]

Restricted Stock Service Based Vesting [Member]

Non Vested Restricted Stock [Member]

Unvested Stock Option [Member]

Share Repurchase Program Period One [Member]

Share Repurchase Program Period One [Member]

Share Repurchase Program Period One [Member]

Share Repurchase Program Period Two [Member]

Share Repurchase Program Period Two [Member]

Employees and Directors [Member]

Non-Executive Employees [Member]

Non-Executive Employees [Member]

Non-Executive Employees [Member]

Advisors [Member]

Advisors [Member]

Advisors [Member]

Advisors [Member]

Advisors [Member]

Management [Member]

2014 Long Term Incentive Plan [Member]

Equity Incentive Plan [Member]

Equity Incentive Plan [Member]

Restricted Stock Units [Member]

Restricted Stock Units [Member]

Restricted Stock Units [Member]

Restricted Stock [Member]

Restricted Stock [Member]

Restricted Stock [Member]

Restricted Stock [Member]

Restricted Stock [Member]

Restricted Stock [Member]

Entelios AG [Member]

Vest in 2015 [Member]

Vest in 2016 [Member]

Ratably Vesting [Member]

Tranche [Member]

Entelios AG [Member]

Entelios AG [Member]

Stockholders Equity [Line Items]

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

Number of shares issuable under new plan

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

1,941,517

'

'

Repurchase of common stock

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

0

0

1,514,552

'

'

'

'

'

'

'

'

'

'

'

60,729

43,821

278,621

Shares available for future grant

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

1,624,783

'

'

Authorized repurchase of common stock

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

$30,000,000

'

'

'

$50,000,000

'

'

'

'

'

'

'

'

'

'

'

'

'

Share repurchase program expire date

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

6-Aug-14

'

6-Aug-14

8-Aug-15

'

'

'

'

'

'

'

'

'

'

'

'

'

'

Proceeds from notes to repurchase share

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

29,973,000

'

'

'

'

'

'

'

'

'

'

'

'

'

'

Purchase price, per share

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

$19.79

'

'

'

'

'

'

'

'

'

'

'

'

'

'

Common stock issued to executives

'

'

'

6,632

8,920

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

Income tax benefit from share-based compensation

'

219,000

999,000

219,000

999,000

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

Material compensation cost capitalized

'

0

0

0

0

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

Stock options outstanding held by employees

'

732,899,000

'

732,899,000

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

Stock options outstanding held by non-employees

'

8,493,000

'

8,493,000

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

Nonvested stock-based compensation expense related to employees

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

21,254,000

7,061,000

4,909,000

216,000

'

'

'

'

'

'

'

133,000

'

'

'

'

'

'

'

'

'

'

'

'

Weighted average period of stock options

'

'

'

'2 years 3 months 18 days

'

'

'

'

'

'

'

'

'

'

'

'2 years 10 months 24 days

'1 year 8 months 12 days

'

'3 years 3 months 18 days

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

Unvested non-employee stock options

'

0

'

0

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

Vesting period restricted stock Restricted stock awards and Restricted stock unit awards

'

'

'

'

'

'

'

'4 years

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'4 years

'

'3 years

'

'

'

Stock options vesting, description

'

'

'

'

'

'

'

'25% cliff vesting after one year and the remaining 75% vesting ratably quarterly thereafter

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

Total number of shares of restricted stock granted during the period

'

'

'

'

'

157,600

80,703

1,125,749

1,491,269

'

'

'

262,882

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

33,000

22,000

11,000

'

'

'

'

Stock-based compensation expense

'

4,135,000

3,821,000

12,161,000

11,832,000

'

'

'

'

'

4,091,000

3,488,000

11,860,000

10,751,000

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

35,000

150,000

'

'

'

'

'

'

'

Unvested shares

'

'

'

'

'

2,253,702

'

2,253,702

'

2,395,322

256,622

'

256,622

'

34,250

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

20,625

20,625

'

'

'

'

'

'

'

Fair value of share-based award

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

406,000

406,000

'

'

'

'

'

'

'

Restricted stock granted to non-executive employees

'

'

'

'

'

10,500

'

10,500

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

Restricted stock granted to board of directors

'

'

'

'

'

31,365

'

31,365

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

Non-vested restricted stock

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

250,382

'

'

'

'

'

'

'

388,034

'

'

'

Percentage of shares vest in 2015, based on operating result

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

10.00%

20.00%

'

'

'

'

'

25.00%

'

'

'

Remaining nonvested restricted shares vested

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

70.00%

'

'

'

'

'

'

'

75.00%

'

'

'

Nonvested restricted shares forfeited based on operating results not achieved

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

100.00%

'

'

'

'

'

'

'

100.00%

'

'

'

Modification of non-executive employee's share-based awards, shares

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

436,415

1,890

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

Increased in fair value after modification of non-executive employee's share-based awards

$590,000

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

Stockholders_Equity_Weighted_A

Stockholders' Equity - Weighted Average Assumptions Used to Estimate Fair Value of Options (Detail)	9 Months Ended
	Sep. 30, 2014	Sep. 30, 2013
Equity [Abstract]	'	'
Risk-free interest rate	2.49%	1.80%
Vesting term, in years	'2 years 2 months 19 days	'2 years 2 months 19 days
Expected annual volatility	70.00%	75.00%
Expected dividend yield	'	'
Exit rate pre-vesting	7.70%	7.70%
Exit rate post-vesting	14.06%	14.06%

Stockholders_Equity_Components

Stockholders' Equity - Components of Stock Based Compensation Expense (Detail) (USD $)	3 Months Ended		9 Months Ended
In Thousands, unless otherwise specified	Sep. 30, 2014	Sep. 30, 2013	Sep. 30, 2014	Sep. 30, 2013
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]	'	'	'	'
Stock based compensation expense	$4,135	$3,821	$12,161	$11,832
Stock-based compensation expense	'	'	12,161	11,832
Chief Executive Officer [Member]	'	'	'	'
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]	'	'	'	'
Stock-based compensation expense	129	'	382	'
Stock Options [Member]	'	'	'	'
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]	'	'	'	'
Stock based compensation expense	44	333	301	1,081
Restricted Stock Units [Member]	'	'	'	'
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]	'	'	'	'
Stock based compensation expense	$4,091	$3,488	$11,860	$10,751

Stockholders_Equity_Stock_Base

Stockholders' Equity - Stock Based Compensation (Detail) (USD $)	3 Months Ended		9 Months Ended
In Thousands, unless otherwise specified	Sep. 30, 2014	Sep. 30, 2013	Sep. 30, 2014	Sep. 30, 2013
Share-based Compensation Arrangement by Share-based Payment Award, Compensation Cost [Line Items]	'	'	'	'
Stock based compensation	$4,135	$3,821	$12,161	$11,832
Selling and Marketing Expenses [Member]	'	'	'	'
Share-based Compensation Arrangement by Share-based Payment Award, Compensation Cost [Line Items]	'	'	'	'
Stock based compensation	1,512	1,426	4,077	4,272
General and Administrative Expenses [Member]	'	'	'	'
Share-based Compensation Arrangement by Share-based Payment Award, Compensation Cost [Line Items]	'	'	'	'
Stock based compensation	2,262	2,049	7,066	6,521
Research and Development Expenses [Member]	'	'	'	'
Share-based Compensation Arrangement by Share-based Payment Award, Compensation Cost [Line Items]	'	'	'	'
Stock based compensation	$361	$346	$1,018	$1,039

Stockholders_Equity_Summary_of

Stockholders' Equity - Summary of Company's Stock Option Activity (Detail) (USD $)	3 Months Ended		9 Months Ended
In Thousands, except Share data, unless otherwise specified	Sep. 30, 2014	Sep. 30, 2013	Sep. 30, 2014	Sep. 30, 2013
Equity [Abstract]	'	'	'	'
Number of Shares Underlying Options Outstanding, Beginning of period	'	'	960,742	'
Number of Shares Underlying Options, Granted	5,750	500	8,559	4,000
Number of Shares Underlying Options, Exercised	'	'	-141,019	'
Number of Shares Underlying Options, Cancelled	'	'	-86,890	'
Number of Shares Underlying Options Outstanding, End of period	741,392	'	741,392	'
Number of Shares Underlying Options, Exercisable at end of period	724,702	'	724,702	'
Number of Shares Underlying Options, Vested or expected to vest at September 30, 2014	740,024	'	740,024	'
Exercise Price Per Share Minimum, End of period	'	'	$0.35	'
Exercise Price Per Share Maximum, End of period	'	'	$48.06	'
Exercise Price Per Share Minimum, Exercisable at end of period	'	'	$0.35	'
Exercise Price Per Share Maximum, Exercisable at end of period	'	'	$48.06	'
Exercise Price Per Share Minimum, Vested or expected to vest September 30, 2014	'	'	$0.35	'
Exercise Price Per Share Maximum, Vested or expected to vest at September 30, 2014	'	'	$48.06	'
Weighted-Average Exercise Price Per Share, Beginning of period	'	'	$17.87	'
Weighted-Average Exercise Price Per Share, Granted	'	'	$19.77	'
Weighted-Average Exercise Price Per Share, Exercised	'	'	$10.32	'
Weighted-Average Exercise Price Per Share, Cancelled	'	'	$29.21	'
Weighted-Average Exercise Price Per Share, End of period	$18	'	$18	'
Weighted-Average Exercise Price Per Share, Exercisable at end of period	$18.02	'	$18.02	'
Weighted-Average Exercise Price Per Share, Vested or expected to vest at September 30, 2014	$18	'	$18	'
Aggregate Intrinsic Value, Beginning of period	'	'	$4,691	'
Aggregate Intrinsic Value, Exercised	752	239	1,418	1,290
Aggregate Intrinsic Value, End of period	3,564	'	3,564	'
Aggregate Intrinsic Value, Exercisable at end of period	3,534	'	3,534	'
Aggregate Intrinsic Value, Vested or expected to vest at September 30, 2014	$3,562	'	$3,562	'

Stockholders_Equity_Summary_of1

Stockholders' Equity - Summary of Company's Stock Option Activity (Parenthetical) (Detail) (USD $)	9 Months Ended
	Sep. 30, 2014	Dec. 31, 2013
Equity [Abstract]	'	'
Weighted average remaining contractual life Exercisable at end of period	'2 years 8 months 12 days	'
Weighted average remaining contractual life Vested or expected to vest	'2 years 7 months 6 days	'
Estimated forfeiture rate	7.70%	'
Fair value of common stock	$16.96	$17.21

Stockholders_Equity_Stock_Opti

Stockholders' Equity - Stock Options Activity Additional Information (Detail) (USD $)	3 Months Ended		9 Months Ended
In Thousands, except Share data, unless otherwise specified	Sep. 30, 2014	Sep. 30, 2013	Sep. 30, 2014	Sep. 30, 2013
Equity [Abstract]	'	'	'	'
Total number of options granted during the period	5,750	500	8,559	4,000
Weighted-average fair value per share of options granted	$11.12	$8.68	$11.20	$10.15
Total intrinsic value of options exercised	$752	$239	$1,418	$1,290

Stockholders_Equity_Summary_of2

Stockholders' Equity - Summary of Company's Restricted Stock Activity (Detail) (Restricted Stock [Member], USD $)	3 Months Ended		9 Months Ended
	Sep. 30, 2014	Sep. 30, 2013	Sep. 30, 2014	Sep. 30, 2013
Restricted Stock [Member]	'	'	'	'
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]	'	'	'	'
Nonvested Number of Shares, Beginning balance	'	'	2,395,322	'
Granted, Number of Shares	157,600	80,703	1,125,749	1,491,269
Vested, Number of Shares	'	'	-1,061,369	'
Cancelled, Number of Shares	'	'	-206,000	'
Nonvested Number of Shares, Ending balance	2,253,702	'	2,253,702	'
Nonvested, Weighted Average Grant Date Fair Value Per Share, Beginning balance	'	'	$13.48	'
Granted, Weighted Average Grant Date Fair Value Per Share	$19.54	$13.53	$19.96	$16.47
Vested, Weighted Average Grant Date Fair Value Per Share	'	'	$15.49	'
Cancelled, Weighted Average Grant Date Fair Value Per Share	'	'	$12.89	'
Nonvested, Weighted Average Grant Date Fair Value Per Share, Ending balance	$17.09	'	$17.09	'

Stockholders_Equity_Additional1

Stockholders' Equity - Additional Information about Restricted Stock (Detail) (Restricted Stock [Member], USD $)	3 Months Ended		9 Months Ended
In Thousands, except Share data, unless otherwise specified	Sep. 30, 2014	Sep. 30, 2013	Sep. 30, 2014	Sep. 30, 2013
Restricted Stock [Member]	'	'	'	'
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]	'	'	'	'
Total number of shares of restricted stock granted during the period	157,600	80,703	1,125,749	1,491,269
Weighted average fair value per share of restricted stock granted	$19.54	$13.53	$19.96	$16.47
Total number of shares of restricted stock vested during the period	158,450	138,282	1,061,369	833,521
Total fair value of shares of restricted stock vested during the period	$2,996	$2,024	$22,357	$13,359

Stockholders_Equity_Summary_of3

Stockholders' Equity - Summary of Company's Restricted Stock Unit Activity (Detail) (Restricted Stock Units [Member], USD $)	9 Months Ended
	Sep. 30, 2014
Restricted Stock Units [Member]	'
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]	'
Nonvested Number of Shares, Beginning balance	34,250
Granted, Number of Shares	262,882
Vested, Number of Shares	-34,250
Cancelled, Number of Shares	-6,260
Nonvested Number of Shares, Ending balance	256,622
Nonvested, Weighted Average Grant Date Fair Value Per Share, Beginning balance	$28.59
Granted, Weighted Average Grant Date Fair Value Per Share	$20.08
Vested, Weighted Average Grant Date Fair Value Per Share	$28.59
Cancelled, Weighted Average Grant Date Fair Value Per Share	$20.11
Nonvested, Weighted Average Grant Date Fair Value Per Share, Ending balance	$20.08

Stockholders_Equity_Additional2

Stockholders' Equity - Additional Information about Restricted Stock Units (Detail) (Restricted Stock Units [Member], USD $)	3 Months Ended		9 Months Ended
In Thousands, except Share data, unless otherwise specified	Sep. 30, 2014	Sep. 30, 2013	Sep. 30, 2014	Sep. 30, 2013
Restricted Stock Units [Member]	'	'	'	'
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]	'	'	'	'
Total number of shares of restricted stock units vested during the period	'	'	34,250	56,603
Total fair value of shares of restricted stock units vested during the period	'	'	$772	$948

Income_Taxes_Additional_Inform

Income Taxes - Additional Information (Detail) (USD $)	3 Months Ended		9 Months Ended
In Thousands, unless otherwise specified	Sep. 30, 2014	Sep. 30, 2013	Sep. 30, 2014	Sep. 30, 2013
Income Tax Disclosure [Abstract]	'	'	'	'
Provision (benefit) from income taxes	$12,111	$5,284	$11,950	$5,828
Effective tax rate	24.00%	'	24.00%	'
Benefit from income taxes due to release of portion valuation allowance	'	'	1,069	'
Provision for deferred income taxes	'	'	1,120	'
Benefit related to share-based payments recorded to additional paid-in capital	'	'	$219	'

Concentrations_of_Credit_Risk_1

Concentrations of Credit Risk - Additional Information (Detail) (USD $)	9 Months Ended
In Thousands, unless otherwise specified	Sep. 30, 2014	Dec. 31, 2013
Concentration Risk [Line Items]	'	'
Percentage of revenues threshold to determine major customer status	10.00%	'
Deposits held by customers	1,874	128
PJM [Member]	'	'
Concentration Risk [Line Items]	'	'
Unbilled revenue	155,102	64,643
Other Customers [Member]	'	'
Concentration Risk [Line Items]	'	'
Unbilled revenue	0	0
Accounts Receivable [Member] | Customer Concentration Risk [Member]	'	'
Concentration Risk [Line Items]	'	'
Share in accounts receivable from major customers	10.00%	10.00%
Accounts Receivable [Member] | Customer Concentration Risk [Member] | PJM [Member]	'	'
Concentration Risk [Line Items]	'	'
Share in accounts receivable from major customers	14.00%	39.00%
Accounts Receivable [Member] | Customer Concentration Risk [Member] | IMO [Member]	'	'
Concentration Risk [Line Items]	'	'
Share in accounts receivable from major customers	14.00%	'
Accounts Receivable [Member] | Customer Concentration Risk [Member] | Pacific Gas and Electric (PG&E) [Member]	'	'
Concentration Risk [Line Items]	'	'
Share in accounts receivable from major customers	12.00%	'
Accounts Receivable [Member] | Customer Concentration Risk [Member] | Southern California Edison Company [Member]	'	'
Concentration Risk [Line Items]	'	'
Share in accounts receivable from major customers	'	18.00%

Concentrations_of_Credit_Risk_2

Concentrations of Credit Risk - Concentrations of Credit Risk of Significant Customers (Detail) (USD $)	3 Months Ended		9 Months Ended
In Thousands, unless otherwise specified	Sep. 30, 2014	Sep. 30, 2013	Sep. 30, 2014	Sep. 30, 2013
Concentration Risk [Line Items]	'	'	'	'
Revenues	$329,422	$278,473	$425,985	$347,476
PJM [Member]	'	'	'	'
Concentration Risk [Line Items]	'	'	'	'
Revenues	225,155	171,377	246,367	173,252
IMO [Member]	'	'	'	'
Concentration Risk [Line Items]	'	'	'	'
Revenues	$42,983	$45,708	$47,380	$45,708
Revenue [Member] | Customer Concentration Risk [Member] | PJM [Member]	'	'	'	'
Concentration Risk [Line Items]	'	'	'	'
% of Total Revenues	68.00%	62.00%	58.00%	50.00%
Revenue [Member] | Customer Concentration Risk [Member] | IMO [Member]	'	'	'	'
Concentration Risk [Line Items]	'	'	'	'
% of Total Revenues	13.00%	16.00%	11.00%	13.00%

Legal_Proceedings_Additional_I

Legal Proceedings - Additional Information (Detail) (USD $)	9 Months Ended
In Thousands, unless otherwise specified	Sep. 30, 2014	Jun. 27, 2014
Legal Proceedings Disclosure [Abstract]	'	'
Cash receivables from insurer	'	$500
Contingent gain recorded as other income	$500	'

Gain_on_Sale_of_Service_Line_A

Gain on Sale of Service Line - Additional Information (Detail) (USD $)	3 Months Ended		9 Months Ended
In Thousands, unless otherwise specified	Sep. 30, 2014	Jun. 30, 2014	Sep. 30, 2014	Apr. 16, 2014
Summary Of Assets And Liabilities Held For Sale [Line Items]	'	'	'	'
Sale of utility solutions consulting services	'	'	'	$4,750
Company entered into an agreement	'	'	16-Apr-14	'
Agreement closed date	'	'	30-May-14	'
Consideration received from sale of business	4,275	'	4,275	'
Held for escrow to cover general representations and warranties	475	'	475	'
Deferred gain recognized	'	'	359	'
Gain recognized from sale	359	'	3,737	'
Potential remaining purchase price adjustment	'	'	103	'
Net of transaction costs and other expenses	'	327	'	'
Increase in deferred tax liability	'	'	1,120	'
Utility Solutions Consulting [Member]	'	'	'	'
Summary Of Assets And Liabilities Held For Sale [Line Items]	'	'	'	'
Gain recognized from sale	'	3,378	'	'
Service Line Contracts [Member]	'	'	'	'
Summary Of Assets And Liabilities Held For Sale [Line Items]	'	'	'	'
Gain recognized from sale	'	'	$3,737	'

Gain_on_Sale_of_Service_Line_S

Gain on Sale of Service Line - Summary of Assets Sold (Detail) (USD $)	Jun. 30, 2014
In Thousands, unless otherwise specified
Summary Of Assets And Liabilities Held For Sale [Line Items]	'
Intangible assets sold	$681
Customer Relationships [Member]	'
Summary Of Assets And Liabilities Held For Sale [Line Items]	'
Intangible assets sold	153
Total Other Definite-Lived Intangible Assets [Member]	'
Summary Of Assets And Liabilities Held For Sale [Line Items]	'
Intangible assets sold	39
Goodwill [Member]	'
Summary Of Assets And Liabilities Held For Sale [Line Items]	'
Intangible assets sold	$489

Gain_on_Sale_of_Assets_Additio

Gain on Sale of Assets - Additional Information (Detail) (USD $)	9 Months Ended				3 Months Ended	9 Months Ended
In Thousands, unless otherwise specified	Sep. 30, 2014	Apr. 22, 2014	Apr. 22, 2014	Apr. 22, 2014	Sep. 30, 2014	Sep. 30, 2014
			First resource [Member]	Second resource [Member]	Other (expense) income [Member]	Other (expense) income [Member]
Summary Of Gain On Sale Of Assets [Line Items]	'	'	'	'	'	'
Aggregate payment of demand response capacity resource	'	$5,740	$2,171	$3,569	'	'
Sale of asset agreement, description	'As a mechanism to pay the consideration due for the purchase of these demand response capacity resources, the third party has agreed to allow the Company to withhold all payments that would be due and payable to this third party under its C&I contractual arrangements and in the event that the payments withheld through March 31, 2015 are not sufficient to cover the purchase price of these demand response capacity resources then the third party is required to pay the remaining amount in cash or otherwise would be in default under the agreement. Upon an event of default, the Company would retain ownership of any resource where the full purchase price had not been paid, as well as, retain $517 of fees received toward the purchase of that unpaid demand response capacity resource.	'	'	'	'	'
Gain on the sale of assets	2,171	'	'	'	'	'
Amount recognized from sale	517	'	'	'	'	'
Amount recognized from sale	'	'	'	'	$155	$207