Demandware (DWRE) 10-Q 7 May 15 2015 Q1 Quarterly report Financial data

Document_and_Entity_Informatio

Document and Entity Information	3 Months Ended
	Mar. 31, 2015	4-May-15
Document And Entity Information [Abstract]
Document Type	10-Q
Amendment Flag	FALSE
Document Period End Date	31-Mar-15
Document Fiscal Year Focus	2015
Document Fiscal Period Focus	Q1
Trading Symbol	DWRE
Entity Registrant Name	DEMANDWARE INC
Entity Central Index Key	1301031
Current Fiscal Year End Date	-19
Entity Filer Category	Large Accelerated Filer
Entity Common Stock, Shares Outstanding		37,425,101

Condensed_Consolidated_Balance

Condensed Consolidated Balance Sheets (USD $)	Mar. 31, 2015	Dec. 31, 2014
In Thousands, unless otherwise specified
Current assets:
Cash and cash equivalents	$109,300	$158,827
Short-term investments	80,420	84,880
Accounts receivable-net of allowance for doubtful accounts of $946 and $525 at March 31, 2015 and December 31, 2014, respectively	39,827	42,441
Prepaid expenses and other current assets	11,491	8,564
Total current assets	241,038	294,712
Property and equipment, net	21,154	14,028
Intangible assets, net	25,515	10,266
Goodwill	60,034	24,379
Other assets	2,341	1,785
Total assets	350,082	345,170
Current liabilities:
Accounts payable	3,111	3,581
Accrued expenses	18,389	24,871
Deferred revenue	28,173	22,799
Other current liabilities	1,834	282
Total current liabilities	51,507	51,533
Long-term liabilities:
Deferred revenue	12,213	12,168
Other long-term liabilities	2,407	1,424
Total liabilities	66,127	65,125
Commitments and contingencies (Note 9)
Redeemable noncontrolling interest	775	823
Stockholders' equity:
Preferred stock, $0.01 par value per share-10,000 shares authorized
Common stock, $0.01 par value per share-240,000 shares authorized, 35,539 and 35,281 shares issued and 35,537 and 35,279 shares outstanding at March 31, 2015 and December 31, 2014, respectively	355	353
Additional paid-in capital	401,413	391,896
Treasury stock, at cost (2 shares at March 31, 2015 and December 31, 2014)	-137	-137
Accumulated other comprehensive loss	-691	-352
Accumulated deficit	-117,760	-112,538
Total stockholders' equity	283,180	279,222
Total liabilities, redeemable noncontrolling interest and stockholders' equity	$350,082	$345,170

Condensed_Consolidated_Balance1

Condensed Consolidated Balance Sheets (Parenthetical) (USD $)	Mar. 31, 2015	Dec. 31, 2014
In Thousands, except Share data, unless otherwise specified
Statement of Financial Position [Abstract]
Accounts receivable, allowance for doubtful accounts	$946	$525
Preferred stock, par value	$0.01	$0.01
Preferred stock, shares authorized	10,000,000	10,000,000
Common stock, par value	$0.01	$0.01
Common stock, shares authorized	240,000,000	240,000,000
Common stock, shares issued	35,539,000	35,281,000
Common stock, shares outstanding	35,537,000	35,279,000
Treasury Stock, shares	2,000	2,000

Condensed_Consolidated_Stateme

Condensed Consolidated Statements of Operations (USD $)	3 Months Ended
In Thousands, except Per Share data, unless otherwise specified	Mar. 31, 2015	Mar. 31, 2014
Revenue:
Subscription	$43,248	$29,905
Services and other	7,028	2,669
Total revenue	50,276	32,574
Cost of revenue:
Subscription	8,873	5,434
Services and other	6,170	3,474
Total cost of revenue	15,043	8,908
Gross profit	35,233	23,666
Operating expenses:
Sales and marketing	21,309	16,483
Research and development	13,683	6,971
General and administrative	11,404	8,312
Total operating expenses	46,396	31,766
Loss from operations	-11,163	-8,100
Other income:
Interest income	99	66
Interest expense		-53
Other income (expense)	189	-11
Other income, net	288	2
Loss before income taxes	-10,875	-8,098
Income tax (benefit) provision	-5,595	265
Net loss	-5,280	-8,363
Net loss attributable to noncontrolling interest	-58
Net loss attributable to Demandware	($5,222)	($8,363)
Net loss per share attributable to Demandware, basic and diluted	($0.15)	($0.24)
Weighted average number of common shares outstanding, basic and diluted	35,360	34,412

Condensed_Consolidated_Stateme1

Condensed Consolidated Statements of Comprehensive Loss (USD $)	3 Months Ended
In Thousands, unless otherwise specified	Mar. 31, 2015	Mar. 31, 2014
Statement of Comprehensive Income [Abstract]
Net loss	($5,280)	($8,363)
Other comprehensive (loss) income:
Foreign currency translation adjustments	-340	6
Unrealized gain (loss) on marketable securities, net of tax	11	-3
Other comprehensive (loss) income	-329	3
Total comprehensive loss	-5,609	-8,360
Net loss attributable to noncontrolling interest	58
Other comprehensive income attributable to noncontrolling interest	-10
Total comprehensive loss attributable to Demandware	($5,561)	($8,360)

Condensed_Consolidated_Stateme2

Condensed Consolidated Statements of Cash Flows (USD $)	3 Months Ended
In Thousands, unless otherwise specified	Mar. 31, 2015	Mar. 31, 2014
CASH FLOWS FROM OPERATING ACTIVITIES:
Net loss	($5,280)	($8,363)
Adjustments to reconcile net loss to net cash provided by (used in) operating activities:
Depreciation and amortization	2,738	1,298
Consulting expense settled with a restricted stock unit award	286
Bad debt expense	397	269
Stock-based compensation	7,056	5,667
Deferred income taxes	-5,807
Amortization of premium on marketable securities	101	130
Other non-cash reconciling items	95	-21
Changes in operating assets and liabilities:
Accounts receivable	11,662	5,405
Prepaid expenses and other current assets	-1,736	-5,847
Other assets and liabilities	1,509	-3,351
Accounts payable	-693	-450
Accrued expenses	-9,213	-1,518
Deferred revenue	831	556
Net cash provided by (used in) operating activities	1,946	-6,225
CASH FLOWS FROM INVESTING ACTIVITIES:
Purchase of property and equipment	-6,809	-6,385
Purchase of marketable securities	-24,569	-36,903
Sale and maturity of marketable securities	33,192	17,225
Acquisition, net of cash acquired	-54,733	-12,136
Net cash used in investing activities	-52,919	-38,199
CASH FLOWS FROM FINANCING ACTIVITIES:
Proceeds from exercise of stock options	2,177	3,348
Payments of equipment notes		-610
Payments of software financing agreement		-766
Net cash provided by financing activities	2,177	1,972
EFFECT OF EXCHANGE RATES ON CASH AND CASH EQUIVALENTS	-731	7
DECREASE IN CASH AND CASH EQUIVALENTS	-49,527	-42,445
CASH AND CASH EQUIVALENTS-Beginning of period	158,827	242,425
CASH AND CASH EQUIVALENTS-End of period	109,300	199,980
SUPPLEMENTARY INFORMATION:
Interest paid		56
Income taxes paid	100	398
NONCASH INVESTING AND FINANCING ACTIVITIES:
Purchase of property and equipment included in accounts payable and accrued expenses	$1,653	$675

Organization_and_Summary_of_Ba

Organization and Summary of Basis of Presentation	3 Months Ended
	Mar. 31, 2015
Accounting Policies [Abstract]
Organization and Summary of Basis of Presentation	1. ORGANIZATION AND SUMMARY OF BASIS OF PRESENTATION
	Company Overview— Demandware, Inc. (the “Company”) provides enterprise-class cloud digital commerce solutions, which includes ecommerce, order management, predictive intelligence as well as retail point-of-sale and store operations for retailers and branded manufacturers. The Company’s solution, Demandware Commerce, is a combination of the Company’s cloud platform, community and related services that enables customers to establish and execute complex digital commerce strategies. These strategies include global expansion, multi-brand, multi-site rollouts, omni-channel and in-store operations as well as single platform, or unified commerce platform, strategies. The foundation of the Company’s solution is the Company’s technology platform, the Demandware Commerce Cloud. Through the Company’s highly scalable, secure and open Demandware Commerce Cloud, the Company’s customers create seamless brand experiences to reach their consumers across all digital touch points globally, including ecommerce sites, mobile applications, in-store solutions and point of sale.
	The Company sells subscriptions to its cloud software and related services through both a direct sales force and indirect channels. The Company’s current customers consist of retailers and branded manufacturers that operate principally in the following vertical markets: apparel and footwear, health and beauty, home and garden, sporting goods, general merchandise and other categories.
	The Company conducts its domestic operations through its headquarters in Burlington, Massachusetts and conducts its international operations through its direct and indirect subsidiaries in Germany, the United Kingdom, France, Sweden, Italy, Australia, China, Hong Kong, India and its joint venture in Japan.
	Basis of Presentation and Consolidation—The accompanying unaudited condensed consolidated financial statements have been prepared in accordance with generally accepted accounting principles in the United States (“GAAP”) applicable to interim periods, under the rules and regulations of the United States Securities and Exchange Commission (“SEC”), and on a basis substantially consistent with the audited consolidated financial statements of the Company as of and for the fiscal year ended December 31, 2014. Accordingly, they do not include all of the information and footnotes required by GAAP for complete financial statements. In the opinion of management, the accompanying unaudited condensed consolidated financial statements contain all adjustments (consisting only of normal recurring adjustments) necessary for a fair presentation of the results of operations for the interim periods reported and of the Company’s financial condition as of the date of the interim balance sheet. The Company considers events or transactions that occur after the balance sheet date but before the financial statements are issued to provide additional information relative to certain estimates or to identify matters that require additional disclosure. Interim results are not necessarily indicative of the results for any other interim period or for the entire year. The consolidated financial statements include the accounts of the Company and those entities in which it has a controlling interest. All intercompany transactions have been eliminated in consolidation. Tomax Corporation’s results of operations have been included in the Company’s consolidated financial statements since January 12, 2015, the date of acquisition (see Note 3).
	The condensed consolidated balance sheet at December 31, 2014 has been derived from the audited financial statements at that date, but does not include all of the disclosures required by GAAP. The accompanying condensed consolidated financial statements should be read in conjunction with the consolidated financial statements and notes thereto contained in the Company’s Annual Report on Form 10-K filed with the SEC on March 2, 2015.
	Correction of Immaterial Errors— As discussed in Note 1, Organization and Basis of Presentation, “Correction of Immaterial Errors”, and Note 18, Selected Quarterly Information (Unaudited), to the 2014 financial statements included in our Annual Report on Form 10-K for the year ended December 31, 2014, the Company corrected an immaterial error in certain implementation services revenue recognition by revising its previously issued financial statements. The impact of these corrections in the condensed consolidated statement of operations for the three months ended March 31, 2014 was a $0.4 million increase to service revenue from $2.3 million to $2.7 million, total revenue from $32.2 million to $32.6 million and gross profit from $23.3 million to $23.7 million, and a $0.4 million decrease in net loss from $8.8 million to $8.4 million. Net loss per share attributable to common stockholders, basic and diluted, decreased $0.01 per share from $0.25 per share to $0.24 per share for the three months ended March 31, 2014. The impact of these corrections in the condensed consolidated statements of cash flows for the three months ended March 31, 2014 was a decrease to the Company’s net losses and a decrease in the change of deferred revenue by $0.4 million within condensed cash flows from operating activities. There was no change to the total net cash used in operating activities for the three months ended March 31, 2014.
	Recent Accounting Pronouncements—In May 2014, the Financial Accounting Standards Board (“FASB”) issued Accounting Standards Update No. 2014-09, “Revenue from Contracts with Customers”, or ASU 2014-09. This standard outlines a single comprehensive model for entities to use in accounting for revenue arising from contracts with customers and supersedes most of the current revenue recognition guidance, including industry-specific guidance. In addition, ASU 2014-09 provides guidance on accounting for certain revenue-related costs including, but not limited to, when to capitalize costs associated with obtaining and fulfilling a contract. ASU 2014-09 provides companies with two implementation methods. Companies can choose to apply the standard retrospectively to each prior reporting period presented (full retrospective application) or retrospectively with the cumulative effect of initially applying the standard as an adjustment to the opening balance of retained earnings of the annual reporting period that includes the date of initial application (modified retrospective application). The Company is currently in the process of evaluating this new guidance. This guidance is effective for annual reporting periods beginning after December 15, 2016, including interim periods within that reporting period. In April 2015, the FASB proposed a delay in the effective date of the standard to January 1, 2018, with an option that would permit companies to adopt the standard as early as the original effective date. Early adoption prior to the original effective date is not permitted.

Net_Loss_Per_Share

Net Loss Per Share	3 Months Ended
	Mar. 31, 2015
Earnings Per Share [Abstract]
Net Loss Per Share	2. NET LOSS PER SHARE
	The Company calculates basic and diluted net loss per common share by dividing the net loss by the weighted average number of common shares outstanding during the period. The Company has excluded all potentially dilutive shares, which include outstanding common stock options and unvested restricted stock, from the weighted average number of common shares outstanding as their inclusion in the computation for all periods would be anti-dilutive due to net losses. The Company’s unvested restricted stock awards are not considered participating securities under the authoritative guidance since any dividends earned on unvested restricted shares are required to be returned if unvested shares are forfeited.
	The following common stock equivalents were excluded from the computation of diluted net loss per share attributable to common stockholders because they had an anti-dilutive impact (in thousands):
		Three Months Ended March 31,
		2015		2014
	Options to purchase common stock		2,658		2,957
	Unvested restricted stock		1,775		1,044

Business_Combination

Business Combination	3 Months Ended
	Mar. 31, 2015
Business Combinations [Abstract]
Business Combination	3. BUSINESS COMBINATION
	On January 12, 2015, the Company acquired 100% of the equity of Tomax Corporation (“Tomax”), an enterprise software company that provides an integrated solution for retail point of sale and store operations, for total cash consideration of approximately $60.0 million. Additional consideration of up to $15.0 million, payable in cash or shares of the Company’s common stock at the option of the Company, is payable to the former Tomax equityholders 12 to 24 months following the date of acquisition, contingent upon the continued employment of certain key employees of Tomax. This consideration will be recognized in the Company’s financial statements as compensation expense over the employment period.
	During the three months ended March 31, 2015, $0.3 million of acquisition-related costs were incurred due to the Tomax acquisition, which is included in the Company’s general and administrative expenses.
	Under the acquisition method of accounting, the Company allocated the purchase price to the identifiable assets and liabilities based on their estimated fair value, which was determined by management using the information available as of the date of the acquisition (Level 3 inputs). The allocation of the Tomax purchase consideration to the assets acquired and liabilities assumed was as follows (in thousands):
	Cash and cash equivalents	$	5,267
	Short-term investments		4,251
	Accounts receivable		9,470
	Property and equipment		987
	Developed technology		14,700
	Customer relationships		1,300
	Trademarks		400
	Goodwill		35,655
	Accounts payable and accrued expenses		(2,426	)
	Deferred revenue		(4,610	)
	Deferred tax liabilities		(6,352	)
	Other assets / liabilities, net		1,358
	Total purchase consideration	$	60,000
	Methodologies used in valuing the intangible assets include, but are not limited to, relief from royalty for trademarks and multiple period excess earnings method for developed technology and customer relationships (see Note 7 for weighted average useful lives assigned to acquired intangible assets). The excess of the purchase price over the total net identifiable assets has been recorded as goodwill, which includes synergies expected from the expanded service capabilities and the value of the assembled work force in accordance with GAAP. For federal income tax purposes, the transaction is treated as a stock acquisition. The goodwill resulting from this transaction is not expected to be deductible for tax purposes.
	The fair value estimates for the assets acquired and liabilities assumed were based upon preliminary calculations and valuations, and the Company’s estimates and assumptions for the acquisition are subject to change as the Company obtains additional information during the measurement periods, up to one year from the acquisition date. The primary area of preliminary estimates that were not yet finalized related to certain receivables and liabilities acquired.
	Tomax’s results of operations are included in the Company’s consolidated results from the acquisition date.
	The following unaudited pro forma results of operations have been presented as if the Tomax transaction occurred on January 1, 2014 (in thousands, except per share data):
		Three Months Ended March 31,
		2015			2014
	Revenue	$	51,260		$	38,140
	Net loss		5,645			13,395
	Net loss attributable to Demandware		5,587			13,395
	Net loss per share, basic and diluted	$	0.16		$	0.39
	This information is based on historical results of operations, adjusted for the allocations of purchase price and other acquisition accounting adjustments, and is not necessarily indicative of what the Company’s results would have been had it operated the businesses since January 1, 2014. The supplemental pro forma net loss for the three months ended March 31, 2014 was adjusted to include all acquisition related costs, which totaled $1.2 million and were primarily incurred in the second half of 2014.

Cash_Equivalents_and_ShortTerm

Cash Equivalents and Short-Term Investments	3 Months Ended
	Mar. 31, 2015
Cash and Cash Equivalents [Abstract]
Cash Equivalents and Short-Term Investments	4. CASH EQUIVALENTS AND SHORT-TERM INVESTMENTS
	A summary of the Company’s cash equivalents and short-term investments at March 31, 2015 is as follows (in thousands):
		Amortized		Unrealized		Unrealized			Fair
		Cost		Gains		Losses			Value
	Cash Equivalents:
	Money market funds	$	87,042	$	—	$	—		$	87,042
	Certificates of deposit		3,522		—		—			3,522
		$	90,564	$	—	$	—		$	90,564
	Short-Term Investments:
	U.S. government agency bonds	$	29,004	$	2	$	(2	)	$	29,004
	Municipal securities		25,684		3		(2	)		25,685
	Certificates of deposit		25,730		1		—			25,731
		$	80,418	$	6	$	(4	)	$	80,420
	A summary of the Company’s cash equivalents and short-term investments at December 31, 2014 is as follows (in thousands):
		Amortized		Unrealized		Unrealized			Fair
		Cost		Gains		Losses			Value
	Cash Equivalents:
	Money market funds	$	140,107	$	—	$	—		$	140,107
	Certificates of deposit		498		—		—			498
	Municipal securities		2,015		—		—			2,015
		$	142,620	$	—	$	—		$	142,620
	Short-Term Investments:
	U.S. government agency bonds	$	21,304	$	1	$	(2	)	$	21,303
	Corporate bonds		6,895		—		(3	)		6,892
	Municipal securities		29,383		2		(7	)		29,378
	Certificates of deposit		27,307		—		—			27,307
		$	84,889	$	3	$	(12	)	$	84,880
	The contractual maturity dates for the Company’s available-for-sale investments that are classified as short-term investments in the consolidated balance sheets are one year or less from the respective balance sheet dates.

Derivative_Instruments

Derivative Instruments	3 Months Ended
	Mar. 31, 2015
Derivative Instruments and Hedging Activities Disclosure [Abstract]
Derivative Instruments	5. DERIVATIVE INSTRUMENTS
	The Company conducts business in a number of foreign countries and transacts business in various foreign currencies. Foreign currency exposures typically arise from transactions denominated in a currency other than the functional currency. The Company utilizes foreign currency forward contracts to offset the risks associated with the effect of certain foreign currency exposures. These contracts are entered into so that increases or decreases in the Company’s foreign currency exposures are offset by gains or losses on the forward contracts in order to mitigate the risks and volatility associated with the Company’s foreign currency transactions. The Company had the following outstanding foreign currency forward contracts as of March 31, 2015 and December 31, 2014 (in thousands):
		March 31, 2015				December 31, 2014
	Currency	Notional		USD		Notional		USD
		Value		Equivalent		Value		Equivalent
	Euro		6,500	$	7,053		6,500	$	7,901
	British Pounds Sterling		3,000	$	4,450		3,000	$	4,660
	The Company has not designated these forward contracts as hedging instruments pursuant to ASC 815, Derivatives and Hedging, and accordingly, the Company recorded the fair value of these contracts at the end of each reporting period in its consolidated balance sheet, with changes in the fair value recorded in earnings as other income (expense), net in the Company’s consolidated statements of operations.

Fair_Value_Measurements

Fair Value Measurements	3 Months Ended
	Mar. 31, 2015
Fair Value Disclosures [Abstract]
Fair Value Measurements	6. FAIR VALUE MEASUREMENTS
	Financial instruments, including cash equivalents, accounts receivable, accounts payable, and accrued expenses are carried in the consolidated financial statements at amounts that approximate fair value at March 31, 2015 and December 31, 2014. Fair values are based on market prices and assumptions concerning the amount and timing of estimated future cash flows and assumed discount rates, reflecting varying degrees of perceived risk. Management believes that the Company’s debt obligations bear interest at rates which approximate prevailing market rates for instruments with similar characteristics and, accordingly, the carrying values for these instruments approximate fair value.
	GAAP defines fair value as the exchange price that would be received for an asset or paid to transfer a liability (an exit price) in the principal or most advantageous market for the asset or liability in an orderly transaction between market participants at the measurement date. Additionally, the inputs used to measure fair value are prioritized based on a three-level hierarchy. This hierarchy requires entities to maximize the use of observable inputs and minimize the use of unobservable inputs. The three levels of inputs used to measure fair value are as follows:
		•		Level 1—Quoted prices in active markets for identical assets or liabilities.
		•		Level 2—Other inputs that are observable directly or indirectly, such as quoted prices for similar assets and liabilities or market corroborated inputs.
		•		Level 3—Unobservable inputs are used when little or no market data is available, which requires the Company to develop its own assumptions about how market participants would value the assets or liabilities.
	The following table details the fair value measurements within the fair value hierarchy of the Company’s financial assets and liabilities at March 31, 2015 and December 31, 2014 (in thousands):
						Fair Value Measurements Using
			Amounts			Quoted		Significant			Significant
			at Fair			Prices in		Other			Unobservable
			Value			Active		Observable			Inputs
						Markets		Inputs			(Level 3)
						for		(Level 2)
						Identical
						Assets
						(Level 1)
	At March 31, 2015
	Assets—Cash Equivalents:
	Money market funds		$	87,042		$	87,042	$	—		$	—
	Certificates of deposit			3,522			—		3,522			—
	Assets—Short-Term Investments:
	U.S. government agency bonds		$	29,004		$	.—	$	29,004		$	—
	Municipal securities			25,685			—		25,685			—
	Certificates of deposit			25,731			—		25,731			—
	Liabilities—Derivative Instruments:
	Foreign currency forward contracts		$	(24	)	$	—	$	(24	)	$	—
	At December 31, 2014
	Assets—Cash Equivalents:
	Money market funds		$	140,107		$	140,107	$	—		$	—
	Certificates of deposit			498			—		498			—
	Municipal securities			2,015			—		2,015			—
	Assets—Short-Term Investments:
	U.S. government agency bonds		$	21,303		$	—	$	21,303		$	—
	Corporate bonds			6,892			—		6,892			—
	Municipal securities			29,378			—		29,378			—
	Certificates of deposit			27,307			—		27,307			—
	Assets— Derivative Instruments:
	Foreign currency forward contracts		$	69		$	—	$	69		$	—
	When developing fair value estimates, the Company maximizes the use of observable inputs and minimizes the use of unobservable inputs. When available, the Company uses quoted market prices to measure fair value. If market prices are not available, the fair value measurement is based on models that use primarily market based parameters including yield curves, volatilities, credit ratings and currency rates. In certain cases where market rate assumptions are not available, the Company is required to make judgments about assumptions market participants would use to estimate the fair value of a financial instrument.
	The valuation technique used to measure fair value for the Company’s Level 1 and Level 2 assets and liabilities is a market approach that uses prices and other relevant information generated by market transactions involving identical or comparable assets. As of March 31, 2015 and December 31, 2014, the Company did not carry Level 3 assets or liabilities.

Goodwill_and_Purchased_Intangi

Goodwill and Purchased Intangible Assets	3 Months Ended
	Mar. 31, 2015
Goodwill and Intangible Assets Disclosure [Abstract]
Goodwill and Purchased Intangible Assets	7. GOODWILL AND PURCHASED INTANGIBLE ASSETS
	Goodwill —Changes in the carrying amount of goodwill in the three months ended March 31, 2015 are as follows (in thousands):
	Balance, December 31, 2014	$	24,379
	Additions related to Tomax acquisition		35,655
	Balance, March 31, 2015	$	60,034
	Purchased Intangible Assets—Intangible assets acquired as of March 31, 2015 are as follows (in thousands):
				As of March 31, 2015
		Weighted Average		Gross Carrying		Accumulated		Net Book Value
		Life (Years)		Amount		Amortization
	Developed technology		6.1	$	25,700	$	2,294	$	23,406
	Customer relationships		8.1		1,900		147		1,753
	Trademarks		2		410		54		356
	Total		6.2	$	28,010	$	2,495	$	25,515
	Intangible assets acquired as of December 31, 2014 are as follows (in thousands):
				As of December 31, 2014
		Weighted Average		Gross Carrying		Accumulated		Net Book Value
		Life (Years)		Amount		Amortization
	Developed technology		5	$	11,000	$	1,242	$	9,758
	Customer relationships		4		600		92		508
	Trademarks		1		10		10		—
	Total		4.9	$	11,610	$	1,344	$	10,266
	Amortization expense related to acquired intangible assets was $1.2 million and $0.2 million for the three months ended March 31, 2015 and 2014, respectively.
	Future estimated amortization expense for acquired intangible assets as of March 31, 2015 is as follows (in thousands):
	Remainder of 2015	$	3,674
	2016		4,707
	2017		4,416
	2018		4,232
	2019		3,564
	Thereafter		4,922
	Total	$	25,515

Noncontrolling_Interest

Noncontrolling Interest	3 Months Ended
	Mar. 31, 2015
Noncontrolling Interest [Abstract]
Noncontrolling Interest	8. NONCONTROLLING INTEREST
	The redeemable noncontrolling interest is classified outside of permanent equity in the Company’s consolidated balance sheet as of March 31, 2015, primarily due to the put right available to the redeemable noncontrolling interest holders in the future which may be settled in cash or common stock of the Company. The balance of the redeemable noncontrolling interest is reported at the greater of the initial carrying amount adjusted for the redeemable noncontrolling interest’s share of earnings, or its estimated redemption value. See Note 11, Noncontrolling Interest, in our Annual Report on Form 10-K for the year ended December 31, 2014.
	The changes in the redeemable noncontrolling interest classified as temporary equity in the balance sheet for the three months ended March 31, 2015 are as follows (in thousands):
	Balance, December 31, 2014	$	823
	Net loss attributable to noncontrolling interest		(58	)
	Foreign currency translation adjustments		10
	Balance, March 31, 2015	$	775

Commitments_and_Contingencies

Commitments and Contingencies	3 Months Ended
	Mar. 31, 2015
Commitments and Contingencies Disclosure [Abstract]
Commitments and Contingencies	9. COMMITMENTS AND CONTINGENCIES
	Litigation—In the ordinary course of business, the Company is involved in litigation incidental to its business, certain of which include speculative claims for substantial or indeterminate amounts of damages. The Company records a liability when it believes that a loss is both probable and reasonably estimable. On a quarterly basis, the Company reviews each of its legal proceedings to determine whether it is probable, reasonably possible or remote that a liability has been incurred and, if it is at least reasonably possible, whether a range of loss can be reasonably estimated. Significant judgment is required to determine both the likelihood of there being a loss and the estimated amount of a loss. The Company’s management is not aware of any pending legal proceeding or other loss contingency, whether asserted or unasserted, affecting the Company for which it might become liable or the outcome of which management expects to have a material impact on the Company. However, the outcome of legal matters is inherently unpredictable and subject to significant uncertainties.

StockBased_Awards

Stock-Based Awards	3 Months Ended
	Mar. 31, 2015
Disclosure of Compensation Related Costs, Share-based Payments [Abstract]
Stock-Based Awards	10. STOCK-BASED AWARDS
	Stock Options—The Company’s stock options generally vest over a four-year period and expire 10 years from the date of grant. Upon option exercise, the Company issues shares of common stock.
	The following table summarizes information related to stock options outstanding as of March 31, 2015 (in thousands, except per share and term information):
		Shares		Weighted-		Weighted-		Aggregate
				Average		Average		Intrinsic
				Exercise		Remaining		Value
				Price		Contractual
				(per Share)		Life
						(in Years)
	Exercisable— March 31, 2015		1,963	$	8.95		5.33	$	102,227
	Options vested and expected to vest— March 31, 2015		2,610	$	18.12		6.09	$	112,541
	Unrecognized compensation expense relating to stock options was $15.3 million at March 31, 2015, which is expected to be recognized over a weighted-average period of approximately three years.
	Restricted Stock Awards—The Company’s restricted stock awards generally vest over a two- or four-year period, and upon vesting, the Company issues shares of common stock. Unrecognized compensation expense relating to restricted stock awards was $89.8 million at March 31, 2015, which is expected to be recognized over a weighted-average period of approximately three years.
	Restricted Stock Units—On June 6, 2014, the Company granted restricted stock units for 16,875 shares of common stock to the Company’s former Chief Financial Officer, as outlined in the Transition and Separation Letter Agreement dated February 10, 2014 between the Company and the former Chief Financial Officer (the “Transition and Separation Letter Agreement”). The restricted stock units will be paid out in shares one year from the grant date, provided that the former Chief Financial Officer substantially complies with the Post-Employment Assistance undertakings and with the Restrictive Covenants Agreements, each as defined in the Transition and Separation Letter Agreement. If the former Chief Financial Officer does not substantially comply, the restricted stock units will be forfeited as of the date of noncompliance. During the three months ended March 31, 2015, the Company recorded $0.3 million of consulting expense for this restricted stock unit award. No such expense was recorded during the three months ended March 31, 2014.
	Employee Stock Purchase Plan— The Employee Stock Purchase Plan (“ESPP”) and its foreign corollaries permit eligible employees to purchase shares of the Company’s common stock through accumulated payroll deductions. 400,000 shares have been allocated for the ESPP. Each offering is a six month period (a “Plan Period”), and the purchase price of the stock is equal to 85% of the lesser of the market value of such shares at the first or last business day of a Plan Period.
	Employee Compensation Contracts Payable in Cash or Shares—As part of its business acquisitions, the Company agreed to pay certain selling equityholders additional consideration contingent upon their continued employment with the Company for a specified period of time. These contingent payments are payable in cash or shares of the Company’s common stock at the option of the Company. The Company recognized the contingent payments over the respective required period of employment. During the three months ended March 31, 2015, the Company recorded $1.9 million of compensation expense related to these contingent payments. No such expense was recorded during the three months ended March 31, 2014.
	Stock-Based Compensation—Stock-based compensation expense is measured at the grant date, based on the fair value of the award, and is recognized as an expense over the service period, which is generally the vesting period of the equity grant. For awards with a performance-based measure, the Company accrues stock-based compensation expense if it is probable that the performance condition will be achieved. The Company estimates forfeitures at the time of grant and revises the estimates, if necessary, in subsequent periods if actual forfeitures differ from those estimates. The following table presents stock-based compensation expense included in the Company’s consolidated statements of operations (in thousands):
		Three Months
		Ended March 31,
		2015		2014
	Cost of subscription revenue	$	223	$	133
	Cost of service and other revenue		627		393
	Sales and marketing		2,267		1,493
	Research and development		1,867		1,536
	General and administration		2,072		2,112
	Total	$	7,056	$	5,667
	Stock-based compensation cost for the three months ended March 31, 2015 includes $5.3 million related to restricted stock awards, $1.7 million related to stock options and $0.1 million related to the ESPP. Stock-based compensation cost for the three months ended March 31, 2014 includes $4.2 million related to restricted stock awards, $1.4 million related to stock options and $0.1 million related to the ESPP.

Income_Taxes

Income Taxes	3 Months Ended
	Mar. 31, 2015
Income Tax Disclosure [Abstract]
Income Taxes	11. INCOME TAXES
	The Company’s income tax (benefit) expense was ($5.6) million and $0.3 million for the three months ended March 31, 2015 and 2014, respectively. The effective income tax rate was 51.5% and (3.3)% for the three months ended March 31, 2015 and 2014, respectively. The income tax benefit for the three months ended March 31, 2015 includes the release of $5.8 million of valuation allowance that resulted from the recognition of the deferred tax liabilities in the Tomax acquisition, which provided evidence to support the recoverability of the deferred tax asset. This benefit was partially offset by the Company’s provision for foreign income taxes.
	The Company has evaluated the positive and negative evidence bearing upon the realizability of its deferred tax assets. Management has determined that it is more likely than not that the Company will not utilize the benefits of federal and state deferred tax assets for financial reporting purposes. Accordingly, the Company has recorded a full valuation allowance against its deferred tax assets for all periods to date with the exception for the deferred tax assets related to Demandware E-Commerce (Shanghai) Limited, Demandware UK Limited, Demandware GmbH and Demandware Australia Pty Limited.
	The Company files federal, state, and foreign income tax returns in jurisdictions with varying statutes of limitations. With few exceptions, all tax years 2004 through 2014 remain subject to examination by federal and most state tax authorities due to the Company’s net operating loss carryforwards. In the Company’s foreign jurisdictions, all tax years remain subject to examination. The Company believes it has adequately reserved for its uncertain tax positions; however, there is no assurance that taxing authorities will not propose adjustments that are more or less than its expected outcome. It is not expected that the amount of unrecognized tax benefits will be recognized in the next twelve months. In addition, the Company does not expect the change in uncertain tax positions to have a material impact on its financial position, results of operations or liquidity.

Organization_and_Summary_of_Ba1

Organization and Summary of Basis of Presentation (Policies)	3 Months Ended
	Mar. 31, 2015
Accounting Policies [Abstract]
Basis of Presentation and Consolidation	Basis of Presentation and Consolidation—The accompanying unaudited condensed consolidated financial statements have been prepared in accordance with generally accepted accounting principles in the United States (“GAAP”) applicable to interim periods, under the rules and regulations of the United States Securities and Exchange Commission (“SEC”), and on a basis substantially consistent with the audited consolidated financial statements of the Company as of and for the fiscal year ended December 31, 2014. Accordingly, they do not include all of the information and footnotes required by GAAP for complete financial statements. In the opinion of management, the accompanying unaudited condensed consolidated financial statements contain all adjustments (consisting only of normal recurring adjustments) necessary for a fair presentation of the results of operations for the interim periods reported and of the Company’s financial condition as of the date of the interim balance sheet. The Company considers events or transactions that occur after the balance sheet date but before the financial statements are issued to provide additional information relative to certain estimates or to identify matters that require additional disclosure. Interim results are not necessarily indicative of the results for any other interim period or for the entire year. The consolidated financial statements include the accounts of the Company and those entities in which it has a controlling interest. All intercompany transactions have been eliminated in consolidation. Tomax Corporation’s results of operations have been included in the Company’s consolidated financial statements since January 12, 2015, the date of acquisition (see Note 3).
	The condensed consolidated balance sheet at December 31, 2014 has been derived from the audited financial statements at that date, but does not include all of the disclosures required by GAAP. The accompanying condensed consolidated financial statements should be read in conjunction with the consolidated financial statements and notes thereto contained in the Company’s Annual Report on Form 10-K filed with the SEC on March 2, 2015.
Correction of Immaterial Errors	Correction of Immaterial Errors— As discussed in Note 1, Organization and Basis of Presentation, “Correction of Immaterial Errors”, and Note 18, Selected Quarterly Information (Unaudited), in our Annual Report on Form 10-K for the year ended December 31, 2014, the Company corrected an immaterial error by revising its previously issued financial statements. The impact of these corrections in the consolidated statement of operations for the three months ended March 31, 2014 was an increase to service revenue and total revenue of $0.4 million, an increase in gross profit from $23.3 million to $23.7 million, and a decrease in net loss from $8.8 million to $8.4 million. Net loss per share attributable to common stockholders, basic and diluted, decreased from $0.25 per share to $0.24 per share for the three months ended March 31, 2014. The impact of these corrections in the consolidated statements of cash flows for the three months ended March 31, 2014 was a decrease to the Company’s net losses and a decrease in the change of deferred revenue by $0.4 million within cash flows from operating activities. There was no change to the total net cash provided by operating activities for the three months ended March 31, 2014.
Recent Accounting Pronouncements	Recent Accounting Pronouncements—In May 2014, the Financial Accounting Standards Board (“FASB”) issued Accounting Standards Update No. 2014-09, “Revenue from Contracts with Customers”, or ASU 2014-09. This standard outlines a single comprehensive model for entities to use in accounting for revenue arising from contracts with customers and supersedes most of the current revenue recognition guidance, including industry-specific guidance. In addition, ASU 2014-09 provides guidance on accounting for certain revenue-related costs including, but not limited to, when to capitalize costs associated with obtaining and fulfilling a contract. ASU 2014-09 provides companies with two implementation methods. Companies can choose to apply the standard retrospectively to each prior reporting period presented (full retrospective application) or retrospectively with the cumulative effect of initially applying the standard as an adjustment to the opening balance of retained earnings of the annual reporting period that includes the date of initial application (modified retrospective application). The Company is currently in the process of evaluating this new guidance. This guidance is effective for annual reporting periods beginning after December 15, 2016, including interim periods within that reporting period. In April 2015, the FASB proposed a delay in the effective date of the standard to January 1, 2018, with an option that would permit companies to adopt the standard as early as the original effective date. Early adoption prior to the original effective date is not permitted.

Net_Loss_Per_Share_Tables

Net Loss Per Share (Tables)	3 Months Ended
	Mar. 31, 2015
Earnings Per Share [Abstract]
Shares Excluded from Computation of Diluted Net Loss Per Share Attributable to Common Stockholders	The following common stock equivalents were excluded from the computation of diluted net loss per share attributable to common stockholders because they had an anti-dilutive impact (in thousands):
		Three Months Ended March 31,
		2015		2014
	Options to purchase common stock		2,658		2,957
	Unvested restricted stock		1,775		1,044

Business_Combination_Tables

Business Combination (Tables)	3 Months Ended
	Mar. 31, 2015
Business Combinations [Abstract]
Schedule of Assets Acquired and Obligations Assumed	The allocation of the Tomax purchase consideration to the assets acquired and liabilities assumed was as follows (in thousands):
	Cash and cash equivalents	$	5,267
	Short-term investments		4,251
	Accounts receivable		9,470
	Property and equipment		987
	Developed technology		14,700
	Customer relationships		1,300
	Trademarks		400
	Goodwill		35,655
	Accounts payable and accrued expenses		(2,426	)
	Deferred revenue		(4,610	)
	Deferred tax liabilities		(6,352	)
	Other assets / liabilities, net		1,358
	Total purchase consideration	$	60,000
Summary of Unaudited ProForma Results of Operations	The following unaudited pro forma results of operations have been presented as if the Tomax transaction occurred on January 1, 2014 (in thousands, except per share data):
		Three Months Ended March 31,
		2015			2014
	Revenue	$	51,260		$	38,140
	Net loss		5,645			13,395
	Net loss attributable to Demandware		5,587			13,395
	Net loss per share, basic and diluted	$	0.16		$	0.39

Cash_Equivalents_and_ShortTerm1

Cash Equivalents and Short-Term Investments (Tables)	3 Months Ended
	Mar. 31, 2015
Cash and Cash Equivalents [Abstract]
Cash Equivalents and Available-for-Sale Investments	A summary of the Company’s cash equivalents and short-term investments at March 31, 2015 is as follows (in thousands):
		Amortized		Unrealized		Unrealized			Fair
		Cost		Gains		Losses			Value
	Cash Equivalents:
	Money market funds	$	87,042	$	—	$	—		$	87,042
	Certificates of deposit		3,522		—		—			3,522
		$	90,564	$	—	$	—		$	90,564
	Short-Term Investments:
	U.S. government agency bonds	$	29,004	$	2	$	(2	)	$	29,004
	Municipal securities		25,684		3		(2	)		25,685
	Certificates of deposit		25,730		1		—			25,731
		$	80,418	$	6	$	(4	)	$	80,420
	A summary of the Company’s cash equivalents and short-term investments at December 31, 2014 is as follows (in thousands):
		Amortized		Unrealized		Unrealized			Fair
		Cost		Gains		Losses			Value
	Cash Equivalents:
	Money market funds	$	140,107	$	—	$	—		$	140,107
	Certificates of deposit		498		—		—			498
	Municipal securities		2,015		—		—			2,015
		$	142,620	$	—	$	—		$	142,620
	Short-Term Investments:
	U.S. government agency bonds	$	21,304	$	1	$	(2	)	$	21,303
	Corporate bonds		6,895		—		(3	)		6,892
	Municipal securities		29,383		2		(7	)		29,378
	Certificates of deposit		27,307		—		—			27,307
		$	84,889	$	3	$	(12	)	$	84,880

Derivative_Instruments_Tables

Derivative Instruments (Tables)	3 Months Ended
	Mar. 31, 2015
Derivative Instruments and Hedging Activities Disclosure [Abstract]
Summary of Outstanding Foreign Currency Forward Contracts	The Company had the following outstanding foreign currency forward contracts as of March 31, 2015 and December 31, 2014 (in thousands):
		March 31, 2015				December 31, 2014
	Currency	Notional		USD		Notional		USD
		Value		Equivalent		Value		Equivalent
	Euro		6,500	$	7,053		6,500	$	7,901
	British Pounds Sterling		3,000	$	4,450		3,000	$	4,660

Fair_Value_Measurements_Tables

Fair Value Measurements (Tables)	3 Months Ended
	Mar. 31, 2015
Fair Value Disclosures [Abstract]
Schedule of Assets and Liabilities Measured at Fair Value on Recurring Basis	The following table details the fair value measurements within the fair value hierarchy of the Company’s financial assets and liabilities at March 31, 2015 and December 31, 2014 (in thousands):
					Fair Value Measurements Using
		Amounts			Quoted		Significant			Significant
		at Fair			Prices in		Other			Unobservable
		Value			Active		Observable			Inputs
					Markets		Inputs			(Level 3)
					for		(Level 2)
					Identical
					Assets
					(Level 1)
	At March 31, 2015
	Assets—Cash Equivalents:
	Money market funds	$	87,042		$	87,042	$	—		$	—
	Certificates of deposit		3,522			—		3,522			—
	Assets—Short-Term Investments:
	U.S. government agency bonds	$	29,004		$	.—	$	29,004		$	—
	Municipal securities		25,685			—		25,685			—
	Certificates of deposit		25,731			—		25,731			—
	Liabilities—Derivative Instruments:
	Foreign currency forward contracts	$	(24	)	$	—	$	(24	)	$	—
	At December 31, 2014
	Assets—Cash Equivalents:
	Money market funds	$	140,107		$	140,107	$	—		$	—
	Certificates of deposit		498			—		498			—
	Municipal securities		2,015			—		2,015			—
	Assets—Short-Term Investments:
	U.S. government agency bonds	$	21,303		$	—	$	21,303		$	—
	Corporate bonds		6,892			—		6,892			—
	Municipal securities		29,378			—		29,378			—
	Certificates of deposit		27,307			—		27,307			—
	Assets— Derivative Instruments:
	Foreign currency forward contracts	$	69		$	—	$	69		$	—

Goodwill_and_Purchased_Intangi1

Goodwill and Purchased Intangible Assets (Tables)	3 Months Ended
	Mar. 31, 2015
Goodwill and Intangible Assets Disclosure [Abstract]
Summary of Changes in Carrying Amount of Goodwill	Goodwill —Changes in the carrying amount of goodwill in the three months ended March 31, 2015 are as follows (in thousands):
	Balance, December 31, 2014	$	24,379
	Additions related to Tomax acquisition		35,655
	Balance, March 31, 2015	$	60,034
Schedule of Intangible Assets Acquired	Purchased Intangible Assets—Intangible assets acquired as of March 31, 2015 are as follows (in thousands):
				As of March 31, 2015
		Weighted Average		Gross Carrying		Accumulated		Net Book Value
		Life (Years)		Amount		Amortization
	Developed technology		6.1	$	25,700	$	2,294	$	23,406
	Customer relationships		8.1		1,900		147		1,753
	Trademarks		2		410		54		356
	Total		6.2	$	28,010	$	2,495	$	25,515
	Intangible assets acquired as of December 31, 2014 are as follows (in thousands):
				As of December 31, 2014
		Weighted Average		Gross Carrying		Accumulated		Net Book Value
		Life (Years)		Amount		Amortization
	Developed technology		5	$	11,000	$	1,242	$	9,758
	Customer relationships		4		600		92		508
	Trademarks		1		10		10		—
	Total		4.9	$	11,610	$	1,344	$	10,266
Schedule of Future Estimated Amortization Expense for Acquired Intangible Assets	Future estimated amortization expense for acquired intangible assets as of March 31, 2015 is as follows (in thousands):
	Remainder of 2015	$	3,674
	2016		4,707
	2017		4,416
	2018		4,232
	2019		3,564
	Thereafter		4,922
	Total	$	25,515

Noncontrolling_Interest_Tables

Noncontrolling Interest (Tables)	3 Months Ended
	Mar. 31, 2015
Noncontrolling Interest [Abstract]
Summary of Changes in Redeemable Noncontrolling Interests Classified as Temporary Equity in Balance Sheet	The changes in the redeemable noncontrolling interest classified as temporary equity in the balance sheet for the three months ended March 31, 2015 are as follows (in thousands):
	Balance, December 31, 2014	$	823
	Net loss attributable to noncontrolling interest		(58	)
	Foreign currency translation adjustments		10
	Balance, March 31, 2015	$	775

StockBased_Awards_Tables

Stock-Based Awards (Tables)	3 Months Ended
	Mar. 31, 2015
Disclosure of Compensation Related Costs, Share-based Payments [Abstract]
Summary of Stock Options Outstanding	The following table summarizes information related to stock options outstanding as of March 31, 2015 (in thousands, except per share and term information):
		Shares		Weighted-		Weighted-		Aggregate
				Average		Average		Intrinsic
				Exercise		Remaining		Value
				Price		Contractual
				(per Share)		Life
						(in Years)
	Exercisable— March 31, 2015		1,963	$	8.95		5.33	$	102,227
	Options vested and expected to vest— March 31, 2015		2,610	$	18.12		6.09	$	112,541
Stock-Based Compensation Expense	The following table presents stock-based compensation expense included in the Company’s consolidated statements of operations (in thousands):
		Three Months
		Ended March 31,
		2015		2014
	Cost of subscription revenue	$	223	$	133
	Cost of service and other revenue		627		393
	Sales and marketing		2,267		1,493
	Research and development		1,867		1,536
	General and administration		2,072		2,112
	Total	$	7,056	$	5,667

Organization_and_Basis_of_Pres

Organization and Basis of Presentation - Additional Information (Detail) (USD $)	3 Months Ended
	Mar. 31, 2015	Mar. 31, 2014
Organization [Line Items]
Deferred revenue	$831,000	$556,000
Adjustment To Service Revenue [Member]
Organization [Line Items]
Prior period adjustment	2,700,000
Adjustments to Total Revenue [Member]
Organization [Line Items]
Prior period adjustment	32,600,000
Adjustment to Gross Profit Loss [Member]
Organization [Line Items]
Prior period adjustment	23,700,000
Adjustment to Net Income Loss [Member]
Organization [Line Items]
Prior period adjustment	8,400,000
Net loss per share attributable to common stockholders, basic and diluted	$0.24
Adjustment [Member]
Organization [Line Items]
Prior period adjustment	400,000
Adjustment [Member] | Adjustments to Total Revenue [Member]
Organization [Line Items]
Prior period adjustment	400,000
Adjustment [Member] | Adjustment to Gross Profit Loss [Member]
Organization [Line Items]
Prior period adjustment	400,000
Adjustment [Member] | Adjustment to Net Income Loss [Member]
Organization [Line Items]
Prior period adjustment	400,000
Net loss per share attributable to common stockholders, basic and diluted	$0.01
As Previously Reported [Member] | Adjustment To Service Revenue [Member]
Organization [Line Items]
Prior period adjustment	2,300,000
As Previously Reported [Member] | Adjustments to Total Revenue [Member]
Organization [Line Items]
Prior period adjustment	32,200,000
As Previously Reported [Member] | Adjustment to Gross Profit Loss [Member]
Organization [Line Items]
Prior period adjustment	23,300,000
As Previously Reported [Member] | Adjustment to Net Income Loss [Member]
Organization [Line Items]
Prior period adjustment	8,800,000
Net loss per share attributable to common stockholders, basic and diluted	$0.25
Deferred revenue	$400,000

Net_Loss_Per_Share_Shares_Excl

Net Loss Per Share - Shares Excluded from Computation of Diluted Net Loss Per Share Attributable to Common Stockholders (Detail)	3 Months Ended
In Thousands, unless otherwise specified	Mar. 31, 2015	Mar. 31, 2014
Stock Option [Member]
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items]
Anti-dilutive securities	2,658	2,957
Restricted Stock Awards [Member]
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items]
Anti-dilutive securities	1,775	1,044

Business_Combination_Additiona

Business Combination - Additional Information (Detail) (Tomax Acquisition [Member], USD $)	0 Months Ended	3 Months Ended
In Millions, unless otherwise specified	Jan. 12, 2015	Mar. 31, 2015	Mar. 31, 2014	Jan. 12, 2015
Business Acquisition [Line Items]
Acquisition date		12-Jan-15
Percentage of equity acquired	100.00%			100.00%
Business acquisition, cash consideration	$60
Additional consideration	15			15
Transaction costs in connection with acquisition		$0.30	$1.20
Minimum [Member]
Business Acquisition [Line Items]
Additional consideration payable period	12 months
Maximum [Member]
Business Acquisition [Line Items]
Additional consideration payable period	24 months

Business_Combination_Schedule_

Business Combination - Schedule of Assets Acquired and Obligations Assumed (Detail) (USD $)	Mar. 31, 2015	Dec. 31, 2014
In Thousands, unless otherwise specified
Business Acquisition [Line Items]
Goodwill	$60,034	$24,379
Tomax Acquisition [Member]
Business Acquisition [Line Items]
Cash and cash equivalents	5,267
Short-term investments	4,251
Accounts receivable	9,470
Property and equipment	987
Goodwill	35,655
Accounts payable and accrued expenses	-2,426
Deferred revenue	-4,610
Deferred tax liabilities	-6,352
Other assets / liabilities, net	1,358
Total purchase consideration	60,000
Tomax Acquisition [Member] | Developed Technology [Member]
Business Acquisition [Line Items]
Finite lived intangible assets	14,700
Tomax Acquisition [Member] | Customer Relationships [Member]
Business Acquisition [Line Items]
Finite lived intangible assets	1,300
Tomax Acquisition [Member] | Trademarks [Member]
Business Acquisition [Line Items]
Finite lived intangible assets	$400

Business_Combination_Summary_o

Business Combination - Summary of Unaudited ProForma Results of Operations (Detail) (Tomax Acquisition [Member], USD $)	3 Months Ended
In Thousands, except Per Share data, unless otherwise specified	Mar. 31, 2015	Mar. 31, 2014
Tomax Acquisition [Member]
Business Acquisition [Line Items]
Revenue	$51,260	$38,140
Net loss	5,645	13,395
Net loss attributable to Demandware	$5,587	$13,395
Net loss per share, basic and diluted	$0.16	$0.39

Cash_Equivalents_and_ShortTerm2

Cash Equivalents and Short-Term Investments - Cash Equivalents and Available-for-Sale Investments (Detail) (USD $)	Mar. 31, 2015	Dec. 31, 2014
In Thousands, unless otherwise specified
Cash and Cash Equivalents [Line Items]
Cash Equivalents - Amortized Cost	$90,564	$142,620
Unrealized Gains	0	0
Unrealized Losses	0	0
Cash Equivalents - Fair Value	90,564	142,620
Short-Term Investments - Amortized Cost	80,418
Unrealized Gains	6
Unrealized Losses	-4
Short-Term Investments - Fair Value	80,420
Money Market Funds [Member]
Cash and Cash Equivalents [Line Items]
Cash Equivalents - Amortized Cost	87,042	140,107
Unrealized Gains	0	0
Unrealized Losses	0	0
Cash Equivalents - Fair Value	87,042	140,107
Certificates of Deposit [Member]
Cash and Cash Equivalents [Line Items]
Cash Equivalents - Amortized Cost	3,522	498
Unrealized Gains	0	0
Unrealized Losses	0	0
Cash Equivalents - Fair Value	3,522	498
Short-Term Investments - Amortized Cost	25,730
Unrealized Gains	1
Short-Term Investments - Fair Value	25,731
Municipal Securities [Member]
Cash and Cash Equivalents [Line Items]
Cash Equivalents - Amortized Cost		2,015
Unrealized Gains		0
Unrealized Losses		0
Cash Equivalents - Fair Value		2,015
Short-Term Investments - Amortized Cost	25,684
Unrealized Gains	3
Unrealized Losses	-2
Short-Term Investments - Fair Value	25,685
U.S. Government Agency Bonds [Member]
Cash and Cash Equivalents [Line Items]
Short-Term Investments - Amortized Cost	29,004
Unrealized Gains	2
Unrealized Losses	-2
Short-Term Investments - Fair Value	29,004
Short-Term Investments [Member]
Cash and Cash Equivalents [Line Items]
Short-Term Investments - Amortized Cost		84,889
Unrealized Gains		3
Unrealized Losses		-12
Short-Term Investments - Fair Value		84,880
Short-Term Investments [Member] | Certificates of Deposit [Member]
Cash and Cash Equivalents [Line Items]
Short-Term Investments - Amortized Cost		27,307
Short-Term Investments - Fair Value		27,307
Short-Term Investments [Member] | Municipal Securities [Member]
Cash and Cash Equivalents [Line Items]
Short-Term Investments - Amortized Cost		29,383
Unrealized Gains		2
Unrealized Losses		-7
Short-Term Investments - Fair Value		29,378
Short-Term Investments [Member] | U.S. Government Agency Bonds [Member]
Cash and Cash Equivalents [Line Items]
Short-Term Investments - Amortized Cost		21,304
Unrealized Gains		1
Unrealized Losses		-2
Short-Term Investments - Fair Value		21,303
Short-Term Investments [Member] | Corporate Bonds and Commercial Paper [Member]
Cash and Cash Equivalents [Line Items]
Short-Term Investments - Amortized Cost		6,895
Unrealized Losses		-3
Short-Term Investments - Fair Value		$6,892

Cash_Equivalents_and_ShortTerm3

Cash Equivalents and Short-Term Investments - Additional Information (Detail)	3 Months Ended
	Mar. 31, 2015
Cash and Cash Equivalents [Abstract]
Contractual maturity expiration dates	1 year

Derivative_Instruments_Summary

Derivative Instruments - Summary of Outstanding Foreign Currency Forward Contracts (Detail) (Foreign Currency Forward Contracts [Member], USD $)	Mar. 31, 2015	Dec. 31, 2014
Euro [Member]
Derivative [Line Items]
Foreign currency forward contracts notional value	$6,500,000	$6,500,000
British Pounds Sterling [Member]
Derivative [Line Items]
Foreign currency forward contracts notional value	3,000,000	3,000,000
USD Equivalent [Member] | Euro [Member]
Derivative [Line Items]
Foreign currency forward contracts notional value	7,053,000	7,901,000
USD Equivalent [Member] | British Pounds Sterling [Member]
Derivative [Line Items]
Foreign currency forward contracts notional value	$4,450,000	$4,660,000

Fair_Value_Measurements_Schedu

Fair Value Measurements - Schedule of Assets and Liabilities Measured at Fair Value on Recurring Basis (Detail) (USD $)	Mar. 31, 2015	Dec. 31, 2014
In Thousands, unless otherwise specified
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Assets-Cash Equivalents	$90,564	$142,620
Assets-Short-Term Investments	80,420	84,880
Money Market Funds [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Assets-Cash Equivalents	87,042	140,107
Certificates of Deposit [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Assets-Cash Equivalents	3,522	498
Assets-Short-Term Investments	25,731	27,307
U.S. Government Agency Bonds [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Assets-Short-Term Investments	29,004	21,303
Municipal Securities [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Assets-Cash Equivalents		2,015
Assets-Short-Term Investments	25,685	29,378
Corporate Bonds [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Assets-Short-Term Investments		6,892
Derivative Financial Instruments, Liabilities [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Liabilities-Foreign currency forward contracts	-24
Derivative Instruments [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Assets-Foreign currency forward contracts		69
Fair Value Measurements Using Quoted Prices in Active Markets for Identical Assets (Level 1) [Member] | Money Market Funds [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Assets-Cash Equivalents	87,042	140,107
Fair Value Measurements Using Significant Other Observable Inputs (Level 2) [Member] | Certificates of Deposit [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Assets-Cash Equivalents	3,522	498
Assets-Short-Term Investments	25,731	27,307
Fair Value Measurements Using Significant Other Observable Inputs (Level 2) [Member] | U.S. Government Agency Bonds [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Assets-Short-Term Investments	29,004	21,303
Fair Value Measurements Using Significant Other Observable Inputs (Level 2) [Member] | Municipal Securities [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Assets-Cash Equivalents		2,015
Assets-Short-Term Investments	25,685	29,378
Fair Value Measurements Using Significant Other Observable Inputs (Level 2) [Member] | Corporate Bonds [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Assets-Short-Term Investments		6,892
Fair Value Measurements Using Significant Other Observable Inputs (Level 2) [Member] | Derivative Financial Instruments, Liabilities [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Liabilities-Foreign currency forward contracts	-24
Fair Value Measurements Using Significant Other Observable Inputs (Level 2) [Member] | Derivative Instruments [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Assets-Foreign currency forward contracts		$69

Recovered_Sheet1

Goodwill And Purchased Intangible Assets - Summary of Changes In Carrying Amount Of Goodwill (Detail) (USD $)	3 Months Ended
In Thousands, unless otherwise specified	Mar. 31, 2015
Goodwill and Intangible Assets Disclosure [Abstract]
Balance, December 31, 2014	$24,379
Additions related to Tomax acquisition	35,655
Balance, March 31, 2015	$60,034

Goodwill_and_Purchased_Intangi2

Goodwill and Purchased Intangible Assets - Schedule of Intangible Assets Acquired (Detail) (USD $)	3 Months Ended	12 Months Ended
In Thousands, unless otherwise specified	Mar. 31, 2015	Dec. 31, 2014
Finite-Lived Intangible Assets [Line Items]
Weighted Average Life (Years)	6 years 2 months 12 days	4 years 10 months 24 days
Gross Carrying Amount	$28,010	$11,610
Accumulated Amortization	2,495	1,344
Net Book Value	25,515	10,266
Developed Technology [Member]
Finite-Lived Intangible Assets [Line Items]
Weighted Average Life (Years)	6 years 1 month 6 days	5 years
Gross Carrying Amount	25,700	11,000
Accumulated Amortization	2,294	1,242
Net Book Value	23,406	9,758
Customer Relationships [Member]
Finite-Lived Intangible Assets [Line Items]
Weighted Average Life (Years)	8 years 1 month 6 days	4 years
Gross Carrying Amount	1,900	600
Accumulated Amortization	147	92
Net Book Value	1,753	508
Trademarks [Member]
Finite-Lived Intangible Assets [Line Items]
Weighted Average Life (Years)	2 years	1 year
Gross Carrying Amount	410	10
Accumulated Amortization	54	10
Net Book Value	$356

Goodwill_and_Purchased_Intangi3

Goodwill and Purchased Intangible Assets - Additional Information (Detail) (USD $)	3 Months Ended
In Millions, unless otherwise specified	Mar. 31, 2015	Mar. 31, 2014
Goodwill and Intangible Assets Disclosure [Abstract]
Intangible assets, amortization expense	$1.20	$0.20

Goodwill_and_Purchased_Intangi4

Goodwill and Purchased Intangible Assets - Schedule of Future Estimated Amortization Expense for Acquired Intangible Assets (Detail) (USD $)	Mar. 31, 2015	Dec. 31, 2014
In Thousands, unless otherwise specified
Goodwill and Intangible Assets Disclosure [Abstract]
Remainder of 2015	$3,674
2016	4,707
2017	4,416
2018	4,232
2019	3,564
Thereafter	4,922
Net Book Value	$25,515	$10,266

Noncontrolling_Interest_Summar

Noncontrolling Interest - Summary of Changes in Redeemable Noncontrolling Interests Classified as Temporary Equity in Balance Sheet (Detail) (USD $)	3 Months Ended
In Thousands, unless otherwise specified	Mar. 31, 2015
Noncontrolling Interest [Abstract]
Balance, December 31, 2014	$823
Net loss attributable to noncontrolling interests	-58
Foreign currency translation adjustments	10
Balance, March 31, 2015	$775

StockBased_Awards_Additional_I

Stock-Based Awards - Additional Information (Detail) (USD $)	0 Months Ended	3 Months Ended
	Jun. 06, 2014	Mar. 31, 2015	Mar. 31, 2014
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Stock-based compensation		$7,056,000	$5,667,000
Contingent Payment in Cash or Shares [Member] | Tomax Acquisition [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Stock-based compensation		1,900,000	0
Stock Option [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Share-based compensation vesting period		4 years
Stock options grant expiration period		10 years
Unrecognized compensation expense		15,300,000
Weighted average period		3 years
Stock-based compensation		1,700,000	1,400,000
Restricted Stock Awards [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Weighted average period		3 years
Unrecognized compensation expense		89,800,000
Stock-based compensation		5,300,000	4,200,000
Restricted Stock Awards [Member] | Minimum [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Share-based compensation vesting period		2 years
Restricted Stock Awards [Member] | Maximum [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Share-based compensation vesting period		4 years
Restricted Stock Units (RSUs) [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Common stock shares granted	16,875
Consulting expense		300,000	0
Employee Stock Purchase Plan [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Allocated shares, employees to purchase		400,000
Percentage of purchase price of stock		85.00%
Stock-based compensation		$100,000	$100,000

StockBased_Awards_Summary_of_S

Stock-Based Awards - Summary of Stock Options Outstanding (Detail) (USD $)	3 Months Ended
In Thousands, except Per Share data, unless otherwise specified	Mar. 31, 2015
Disclosure of Compensation Related Costs, Share-based Payments [Abstract]
Exercisable Shares- March 31, 2015	1,963
Options vested and expected to vest, Shares- March 31, 2015	2,610
Exercisable Weighted-Average Exercise Price (per share)-March 31, 2015	$8.95
Options vested and expected to vest, Weighted-Average Exercise Price (per share)-March 31, 2015	$18.12
Exercisable, Weighted-Average Remaining Contractual Life (in Years)-March 31, 2015	5 years 3 months 29 days
Options vested and expected to vest, Weighted-Average Remaining Contractual Life (in Years)- March 31, 2015	6 years 1 month 2 days
Exercisable, Aggregate Intrinsic Value-March 31, 2015	$102,227
Options vested and expected to vest, Aggregate Intrinsic Value- March 31, 2015	$112,541

StockBased_Awards_StockBased_C

Stock-Based Awards - Stock-Based Compensation Expense (Detail) (USD $)	3 Months Ended
In Thousands, unless otherwise specified	Mar. 31, 2015	Mar. 31, 2014
Share-based Compensation Arrangement by Share-based Payment Award, Compensation Cost [Line Items]
Stock-based compensation cost	$7,056	$5,667
Cost of Subscription Revenue [Member]
Share-based Compensation Arrangement by Share-based Payment Award, Compensation Cost [Line Items]
Stock-based compensation cost	223	133
Cost of Service and Other Revenue [Member]
Share-based Compensation Arrangement by Share-based Payment Award, Compensation Cost [Line Items]
Stock-based compensation cost	627	393
Sales and Marketing [Member]
Share-based Compensation Arrangement by Share-based Payment Award, Compensation Cost [Line Items]
Stock-based compensation cost	2,267	1,493
Research and Development [Member]
Share-based Compensation Arrangement by Share-based Payment Award, Compensation Cost [Line Items]
Stock-based compensation cost	1,867	1,536
General and Administration [Member]
Share-based Compensation Arrangement by Share-based Payment Award, Compensation Cost [Line Items]
Stock-based compensation cost	$2,072	$2,112

Income_Taxes_Additional_Inform

Income Taxes - Additional Information (Detail) (USD $)	3 Months Ended
	Mar. 31, 2015	Mar. 31, 2014
Income Tax [Line Items]
Income tax expense	($5,595,000)	$265,000
Effective income tax rate	51.50%	-3.30%
Tomax Acquisition [Member]
Income Tax [Line Items]
Deferred tax liabilities, valuation allowance	$5,800,000