Itron Networked Solutions (SSNI) 10-Q 13 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	'ssni	'
Entity Registrant Name	'SILVER SPRING NETWORKS INC	'
Entity Central Index Key	'0001180079	'
Current Fiscal Year End Date	'--12-31	'
Entity Filer Category	'Non-accelerated Filer	'
Entity Common Stock, Shares Outstanding	'	48,775,523

Condensed_Consolidated_Balance

Condensed Consolidated Balance Sheets (USD $)	Sep. 30, 2014	Dec. 31, 2013
In Thousands, unless otherwise specified
Current assets:	'	'
Cash and cash equivalents	$50,114	$82,596
Short-term investments	60,352	63,256
Accounts receivable	67,929	69,724
Inventory	4,511	4,350
Deferred cost of revenue	25,700	37,460
Prepaid expenses and other current assets	7,372	4,758
Total current assets	215,978	262,144
Property and equipment, net	12,381	12,364
Deferred cost of revenue, non-current	312,933	238,663
Deferred tax assets, non-current	1,232	1,613
Other long-term assets	10,403	1,567
Total assets	552,927	516,351
Current liabilities:	'	'
Accounts payable	28,412	31,317
Accrued liabilities	27,829	21,282
Deferred revenue	74,380	111,293
Current portion of capital lease obligations	1,399	1,615
Deferred tax liability	1,206	1,176
Total current liabilities	133,226	166,683
Deferred revenue, non-current	543,036	413,360
Other liabilities	15,709	14,426
Commitments and contingencies (Note 4)	'	'
Stockholders' deficit:	'	'
Common stock and additional paid-in capital, $0.001 par value, 1,000,000 shares authorized; 48,734 and 47,384 shares issued and outstanding as of September 30, 2014 and December 31, 2013, respectively	567,824	539,013
Accumulated other comprehensive income	64	130
Accumulated deficit	-706,932	-617,261
Total stockholders' deficit	-139,044	-78,118
Total liabilities and stockholders’ deficit	$552,927	$516,351

Condensed_Consolidated_Balance1

Condensed Consolidated Balance Sheets (Parenthetical) (USD $)	Sep. 30, 2014	Dec. 31, 2013
Condensed Consolidated Balance Sheets [Abstract]	'	'
Preferred stock, par value	$0.00	$0.00
Preferred stock, shares authorized	10,000,000	10,000,000
Preferred stock, shares issued	0	0
Preferred stock, shares outstanding	0	0
Common stock, par value	$0.00	$0.00
Common stock, shares authorized	1,000,000,000	1,000,000,000
Common stock, shares issued	48,734,000	47,384,000
Common stock, shares outstanding	48,734,000	47,384,000

Condensed_Consolidated_Stateme

Condensed Consolidated Statements of Operations (USD $)	3 Months Ended		9 Months Ended
In Thousands, except Per Share data, unless otherwise specified	Sep. 30, 2014	Sep. 30, 2013	Sep. 30, 2014	Sep. 30, 2013
Revenue:	'	'	'	'
Product revenue	$16,321	$56,650	$69,299	$146,366
Service revenue	11,720	15,831	44,578	83,328
Total revenue, net	28,041	72,481	113,877	229,694
Cost of revenue:	'	'	'	'
Product cost of revenue	10,791	34,844	42,120	100,152
Service cost of revenue	15,947	14,411	45,598	47,932
Total cost of revenue	26,738	49,255	87,718	148,084
Gross profit	1,303	23,226	26,159	81,610
Operating expenses:	'	'	'	'
Research and development	16,986	16,980	52,053	60,851
Sales and marketing	10,131	7,424	28,208	26,514
General and administrative	9,601	10,937	33,256	35,952
Restructuring and other	2,005	'	1,905	'
Total operating expenses	38,723	35,341	115,422	123,317
Operating loss	-37,420	-12,115	-89,263	-41,707
Other income (expense), net:	'	'	'	'
Interest income (expense), net	7	-54	55	-1,290
Conversion of promissory notes and remeasurement of warrants and derivatives	'	'	'	-23,676
Other income (expense), net	7	-54	55	-24,966
Loss before income taxes	-37,413	-12,169	-89,208	-66,673
(Benefit) provision for income taxes	-140	100	463	492
Net loss	-37,273	-12,269	-89,671	-67,165
Deemed dividend to convertible preferred stockholders	'	'	'	-105,000
Net loss attributable to common stockholders	($37,273)	($12,269)	($89,671)	($172,165)
Net loss per share	'	'	'	'
Basic	($0.77)	($0.26)	($1.86)	($4.96)
Diluted	($0.77)	($0.26)	($1.86)	($4.96)
Weighted average shares used to compute net loss per share	'	'	'	'
Basic	48,551	46,729	48,189	34,733
Diluted	48,551	46,729	48,189	34,733

Condensed_Consolidated_Stateme1

Condensed Consolidated Statements of Comprehensive Income (Loss) (USD $)	3 Months Ended		9 Months Ended
In Thousands, unless otherwise specified	Sep. 30, 2014	Sep. 30, 2013	Sep. 30, 2014	Sep. 30, 2013
Condensed Consolidated Statements of Comprehensive Income (Loss) [Abstract]	'	'	'	'
Net loss	($37,273)	($12,269)	($89,671)	($67,165)
Other comprehensive income (loss):	'	'	'	'
Change in foreign currency adjustment	75	-62	63	45
Net unrealized holding gain (loss) on available for sale investments	-74	131	-129	131
Other comprehensive income (loss)	1	69	-66	176
Comprehensive loss	($37,272)	($12,200)	($89,737)	($66,989)

Condensed_Consolidated_Stateme2

Condensed Consolidated Statements of Cash Flows (USD $)	9 Months Ended
In Thousands, unless otherwise specified	Sep. 30, 2014	Sep. 30, 2013
Cash flows used in operating activities:	'	'
Net loss	($89,671)	($67,165)
Adjustments to reconcile net loss to net cash provided by (used in) operating activities:	'	'
Restructuring and other	1,072	'
Depreciation and amortization	4,704	4,990
Stock-based compensation	31,470	44,503
Conversion of promissory notes and remeasurement of warrants and derivatives	'	23,676
Other non-cash adjustments	1,262	1,565
Changes in operating assets and liabilities:	'	'
Accounts receivable	1,795	-3,126
Inventory	-779	534
Prepaid expenses and other current assets	-2,775	-2,248
Deferred cost of revenue	-62,510	-29,938
Other long-term assets	185	3,846
Accounts payable	-3,165	-1,746
Accrued liabilities	1,333	2,379
Customer deposits	33	-247
Deferred revenue	92,413	24,490
Other liabilities	2,244	-3,343
Net cash used in operating activities	-22,389	-1,830
Cash flows provided by (used in) investing activities:	'	'
Acquisitions, net	-8,750	'
Proceeds from sales and maturities of short-term investments	49,209	'
Payment on purchases of short-term investments	-46,621	-61,451
Acquisitions of property, plant and equipment	-4,222	-3,343
Net cash used in investing activities	-10,384	-64,794
Cash flows provided by (used in) financing activities:	'	'
Payment upon termination of preferred stock warrants of a related party	'	-12,000
Proceeds from initial public offering, net of offering costs	'	84,472
Proceeds from private placement of common stock with a related party	'	12,000
Payments on capital lease obligations	-1,145	-1,485
Proceeds from issuance of common stock, net of repurchases	6,846	578
Taxes paid related to net share settlement of equity awards	-5,410	-7,722
Net cash provided by financing activities	291	75,843
Net increase (decrease) in cash and cash equivalents	-32,482	9,219
Cash and cash equivalents-beginning of period	82,596	72,646
Cash and cash equivalents-end of period	50,114	81,865
Supplemental cash flow information-cash paid for taxes	544	186
Supplemental cash flow information-cash paid for interest	106	212
Non-cash investing and financing activities:	'	'
Conversion of convertible preferred stock into common stock	'	270,725
Fair value of common stock issued on conversion of convertible promissory notes	'	79,441
Deferred offering costs not yet paid	'	245
Property and equipment acquired under capital lease	'	$1,768

Description_of_Business_and_Su

Description of Business and Summary of Significant Accounting Policies	9 Months Ended
	Sep. 30, 2014
Description of Business and Summary of Significant Accounting Policies [Abstract]	'
Description of Business and Summary of Significant Accounting Policies	'
	1. Description of Business and Summary of Significant Accounting Policies
	We have over ten years of experience creating, building and successfully deploying large scale networks and solutions enabling the “internet of things” for critical infrastructure. The “internet of things” refers to a system where a diversity of physical devices has the capacity to communicate using internet technologies. Our first area of focus was in energy, creating a leading grid network by applying advanced networking technology and solutions to the power grid. We have recently broadened beyond the smart grid to networking other critical infrastructure such as street lights, enabling smarter and more efficient cities.
	We provide a networking platform and solutions that enable utilities to transform the power grid infrastructure into the smart grid. The foundation of our technology is a standards-based and secure Internet Protocol, or IP, network. Our networking platform provides two-way communications between the utility back office and devices on the power grid. In addition to our networking platform, we offer a suite of solutions that run on top of our network and complementary services. Our solutions include advanced metering, distribution automation and demand-side management.  Our service offerings include professional services to implement our products, managed services and software as a service, or SaaS, to assist utilities with managing the network and solutions, and ongoing customer support.  We have recently broadened beyond the smart grid to networking other critical infrastructure, such as street lights, that enables cities to be smarter and more efficient.
	We believe our technology is particularly well suited for a range of other solutions across the broad category of “internet of things.” We are focused on critical infrastructure that requires similar networking performance as the current market we serve. Our first expansion beyond the power grid has been to city infrastructure, specifically networking street lights. We believe that by applying advanced networking technology, we can enable cities to achieve their goals of increasing energy and operating efficiency while improving quality of life. We expect to expand our offerings in this area as the market opportunity evolves.
	Silver Spring Networks, Inc., headquartered in Redwood City, California, was founded in July 2002 and incorporated in the State of Delaware on July 3, 2002 as Real Time Techcomm, Inc. On August 6, 2002, we changed our name to Silver Spring Networks, Inc.
	Reverse Stock Split
	Prior to our initial public offering (“IPO”) in March 2013, our Board of Directors and holders of the requisite number of outstanding shares of our capital stock approved an amendment to our restated certificate of incorporation to effect a 5-for-1 reverse stock split of our outstanding capital stock. The reverse stock split was effected on February 11, 2013 and did not result in an adjustment to par value. The reverse stock split is reflected in the accompanying condensed consolidated financial statements and related notes on a retroactive basis for all periods presented.
	Accounting Principles and Basis of Presentation
	The accompanying unaudited condensed consolidated financial statements have been prepared in accordance with generally accepted accounting principles in the United States (“GAAP”) and applicable rules and regulations of the Securities and Exchange Commission (“SEC”) regarding interim financial reporting. Certain information and note disclosures normally included in the consolidated financial statements prepared in accordance with GAAP have been condensed or omitted pursuant to such rules and regulations. As such, the information included in this Quarterly Report on Form 10-Q should be read in conjunction with the consolidated financial statements and accompanying notes included in our Annual Report on Form 10-K for the year ended December 31, 2013.
	The condensed consolidated balance sheet as of December 31, 2013, included herein, was derived from the audited financial statements as of that date, but does not include all disclosures including notes required by GAAP.
	The condensed consolidated financial statements include the accounts of Silver Spring Networks, Inc. and its wholly owned subsidiaries. All intercompany balances and transactions have been eliminated.
	The accompanying unaudited condensed consolidated financial statements reflect all normal recurring adjustments necessary to present fairly the financial position, results of operations, comprehensive income (loss), and cash flows for the interim periods but are not necessarily indicative of the results of operations to be anticipated for the full year ending December 31, 2014.
	There have been no changes to our significant accounting policies described in the Annual Report on Form 10-K that have had a material impact on our condensed consolidated financial statements and related notes.
	Use of Estimates
	The preparation of financial statements in conformity with GAAP requires management to make estimates and assumptions that affect the reported amounts of assets and liabilities, contingent assets and liabilities, and revenue and expenses during the reporting period. Estimates are used for revenue and cost recognition, inventory valuation, warranty obligations, stock-based compensation, classification of current and non-current deferred revenue and deferred cost of revenue, intangible assets, income taxes and deferred income tax assets and associated valuation allowances. These estimates generally involve complex issues and require judgments, involve the analysis of historical and prediction of future trends, can require extended periods of time to resolve and are subject to change from period to period. Actual results may differ materially from management’s estimates.
	Inventory
	Inventory is stated at the lower of cost or market.  Inventory consisted of the following (in thousands):
		September 30,		December 31,
		2014		2013
	Component parts	$	1,945	$	690
	Finished goods		2,566		3,660
	Inventory	$	4,511	$	4,350
	Total inventory also included consigned inventory of $ 3.7 million and $2.8 million as of September 30, 2014 and December 31, 2013, respectively.
	Product Warranty
	We provide warranties for substantially all of our products. Our standard warranty period extends from one to five years. We accrue for costs of standard warranty at the time of product shipment and record changes in estimates to warranty accruals when it is probable a liability has been incurred and the amount of loss can be reasonably estimated.
	Product warranty obligation is presented as follows on the condensed consolidated balance sheets (in thousands):
		September 30,		December 31,
		2014		2013
	Current warranty obligation—classified in accrued liabilities	$	4,126	$	2,985
	Non-current warranty obligation—classified in other liabilities		3,157		3,104
		$	7,283	$	6,089
	Product warranty activity was as follows (in thousands):
		Nine Months Ended
		September 30,
		2014		2013
	Warranty obligation—beginning of period	$	6,089	$	6,316
	Warranty expense for new warranties issued		506		1,107
	Utilization of warranty obligation		-2,101		-1,288
	Changes in estimates for pre-existing warranties		2,789		178
	Warranty obligation—end of period	$	7,283	$	6,313
	During the nine months ended September 30, 2014 and 2013, we revised our estimated warranty liability to reflect changes in cost estimates and, to a lesser extent, product field reliability experience and recorded an increase (reduction) of product warranty liability and product cost of revenue of $2.8 million and $0.2 million, respectively.
	At the time of product shipment, we estimate and accrue for the amount of standard warranty cost and record the amount as a cost of revenue. Determining the amount of warranty costs requires management to make estimates and judgments based on historical claims experience, industry benchmarks, test data and various other assumptions including estimated field failure rates that are believed to be reasonable under the circumstances. The amount of warranty costs accrued are net of warranty obligations to be fulfilled by our suppliers. The results of these judgments formed the basis for our estimate of the total charge to cover anticipated customer warranty, repair, return and replacement and other associated costs. Should actual product failure rates, claim levels, material usage or supplier warranties on parts used in our products differ from our original estimates, revisions to the estimated warranty liability could result in adjustments to our cost of revenue in future periods.
	Certain of our standard product warranty obligations require us to reimburse a customer for installation and other related costs in the event that field reliability rates fall below contractually specified thresholds. We consider the probability that we will have to pay such incremental warranty costs based on the expected performance of a delivered product when we record new warranty obligations issued in a period as well as when we determine if any changes are required to our original estimates for pre-existing warranty obligations.
	Our warranty obligations are affected by product failure rates, claims levels, material usage and supplier warranties on parts included in our products. Because our products are relatively new and we do not have the benefit of long-term experience observing the products’ performance in the field, it is possible that the estimates of a product’s lifespan and incidence of claims could vary from period to period.
	In certain customer arrangements, we have provided extended warranties for periods of up to 15 years following the initial standard warranty period. We recognize revenue associated with extended warranties over the extended warranty period when the extended warranty period commences. Costs associated with providing extended warranties are expensed as incurred during the extended warranty period. As of September 30, 2014 and December 31, 2013, we had deferred revenue associated with extended warranty arrangements of $0.5 million and $0.2 million, respectively, included in other current liabilities, and $8.0 million and $7.1 million, respectively, included in other long-term liabilities on our condensed consolidated balance sheets.
	Conversion of Convertible Promissory Notes and Embedded Derivatives
	In connection with our IPO in March 2013, the conversion of the convertible notes and issuance of common stock were accounted for as debt extinguishments and accordingly, the convertible notes, unamortized debt issuance costs and bifurcated compound embedded derivatives were removed at their respective carrying amounts and the shares of common stock issued were measured at fair value based on the closing price on the date our IPO closed. As a result, we recorded a loss on debt extinguishments of $22.9 million in the three months ended March 31, 2013.
	Accumulated Other Comprehensive Income (AOCI)
	The components of AOCI, net of tax, were as follows (in thousands):
				Unrealized Gains
		Foreign Currency		(Losses) on Available
		Adjustment		for Sale Securities		Total
	Balance as of December 31, 2013	$	46	$	84	$	130
	Other comprehensive income before reclassification		63		-13		50
	Amounts reclassified from AOCI		—		-116		-116
	Other comprehensive income (loss)		63		-129		-66
	Balance as of September 30, 2014	$	109	$	-45	$	64
	Other Long-Term Assets
	Other long-term assets consisted of the following:
		September 30,		December 31,
		2014		2013
	Acquired intangible assets, net	$	4,130	$	224
	Goodwill		5,131		447
Prepaid expenses, deposits, and receivables, non-current		1,142		896
Other long-term assets	$	10,403	$	1,567
Recent Accounting Pronouncements
In May 2014, the Financial Accounting Standards Board issued guidance related to revenue from contracts with customers, which supersedes the revenue recognition requirements in ASC 605, Revenue Recognition. Under this guidance, revenue is recognized when promised goods or services are transferred to customers in an amount that reflects the consideration that is expected to be received for those goods or services. The new guidance also requires additional disclosure about the nature, amount, timing and uncertainty of revenue and cash flows arising from customer contracts, including significant judgments and changes in judgments and assets recognized from costs incurred to obtain or fulfill a contract.  The updated standard will replace most existing revenue recognition guidance under GAAP when it becomes effective and permits the use of either the full retrospective or cumulative effect transition method. Early adoption is not permitted. The updated standard will be effective for us in the first quarter of 2017. We have not yet selected a transition method and we are currently evaluating the effect that the updated standard will have on our consolidated financial statements and related disclosures.

Net_Income_Loss_Per_Share

Net Income (Loss) Per Share	9 Months Ended
	Sep. 30, 2014
Net Income (Loss) Per Share [Abstract]	'
Net Income (Loss) Per Share	'
	2. Net income (loss) per share
	In connection with our IPO, all of our outstanding convertible preferred stock converted into common stock. In addition, we recognized a deemed dividend of $105.0 million to common stockholders on the date of conversion.  Basic net loss per share applicable to common stockholders is computed by dividing the net loss applicable to common stockholders by the weighted-average number of shares of common stock outstanding during the period. Diluted net loss per share applicable to common stockholders is computed by giving effect to all potential shares of common stock, including stock options and restricted stock units, to the extent dilutive.
	The following table sets forth the computation of basic and diluted net loss per share applicable to common stockholders (in thousands, except per share data):
		Three Months Ended				Nine Months Ended
		September 30,				September 30,
		2014		2013		2014		2013
	Net loss	$	-37,273	$	-12,269	$	-89,671	$	-67,165
	Deemed dividend to convertible preferred stockholders		—		—		—		-105,000
	Net loss available to common stockholders	$	-37,273	$	-12,269	$	-89,671	$	-172,165
	Weighted average common shares outstanding—basic		48,551		46,729		48,189		34,733
	Weighted average common shares outstanding—diluted		48,551		46,729		48,189		34,733
	Basic loss per common share	$	-0.77	$	-0.26	$	-1.86	$	-4.96
	Diluted loss per common share	$	-0.77	$	-0.26	$	-1.86	$	-4.96
	The following potential common shares outstanding were excluded from the computation of diluted net loss per share because including them would have been anti-dilutive (in thousands):
		September 30,
		2014		2013
	Employee equity incentive plans		7,512		6,749
	Total common stock equivalents		7,512		6,749

Financial_Instruments

Financial Instruments	9 Months Ended
	Sep. 30, 2014
Financial Instruments [Abstract]	'
Financial Instruments	'
	3. Financial Instruments
	Cash, Cash Equivalents and Short-Term Investments
	Cash equivalents consist of highly liquid investments with insignificant interest rate risk and original or remaining maturities at the time of purchase of three months or less, and consist primarily of money market funds and U.S. Government securities. Short-term investments consist of high investment grade securities with original or remaining maturities at the time of purchase of greater than three months, and are available for use in current operations. We classify all of our cash equivalents and short-term investments as available-for-sale and record at fair value. Unrealized gains and losses are included in accumulated other comprehensive income (loss), which is reflected as a separate component of stockholders’ deficit. Realized gains and losses are included in other income and expense, net. Determining whether a decline in fair value is other-than-temporary requires management judgment based on the specific facts and circumstances of each security. We evaluate our short-term investments for impairment each reporting period. Amounts are reclassified out of accumulated other comprehensive income (loss) into earnings using the specific identification method.
	Cash, cash equivalents and short-term investments consisted of the following (in thousands):
		As of September 30, 2014
		Amortized		Unrealized		Unrealized		Estimated
		Cost		Gains		Losses		Fair Value
	Current assets:
	Cash	$	43,917	$	—	$	—	$	43,917
	Cash equivalents:
	Money market mutual funds		6,197		—		—		6,197
	Total cash equivalents		6,197		—		—		6,197
	Short-term fixed income securities:
	U.S. government and agency obligations		38,686		45		-30		38,701
	U.S. and foreign corporate debt securities		19,659		16		-21		19,654
	Foreign governments and multi-national agency obligations		2,001		—		-4		1,997
	Total short-term investments		60,346		61		-55		60,352
	Total cash, cash equivalents and short-term investments	$	110,460	$	61	$	-55	$	110,466
		As of December 31, 2013
		Amortized		Unrealized		Unrealized		Estimated
		Cost		Gains		Losses		Fair Value
	Current assets:
	Cash	$	52,346	$	—	$	—	$	52,346
	Cash equivalents:
	Money market mutual funds		30,250		—		—		30,250
	Total cash equivalents		30,250		—		—		30,250
	Short-term fixed income securities:
	U.S. government and agency obligations		41,991		84		-21		42,054
	U.S. and foreign corporate debt securities		18,366		76		-1		18,441
	Foreign governments and multi-national agency obligations		2,764		—		-3		2,761
	Total short-term investments		63,121		160		-25		63,256
	Total cash, cash equivalents and short-term investments	$	145,717	$	160	$	-25	$	145,852
	As of September 30, 2014, approximately 45%, 42%, and  5% of our cash, cash equivalents, and short-term investments were held with three separate financial institutions.  As of December 31, 2013, approximately 41%,  34%, and 21% of our cash, cash equivalents, and short-term investments were held with three separate financial institutions.
	Contractual Maturities
	The contractual maturities of cash equivalents and short-term investments consisted of the following (in thousands):
		30-Sep-14				31-Dec-13
		Amortized		Aggregate		Amortized		Aggregate
		Cost Basis		Fair Value		Cost Basis		Fair Value
	Due within one year	$	21,981	$	21,996	$	44,477	$	44,474
	Due after 1 year through 3 years		44,562		44,553		48,894		49,032
	Total cash equivalents & short-term investments	$	66,543	$	66,549	$	93,371	$	93,506
	Fair Value Measurements
	We measure certain financial assets at fair value on a recurring basis.
	The measurements of fair value were established based on a fair value hierarchy that prioritizes the inputs. This hierarchy requires an entity to maximize the use of observable inputs and minimize the use of unobservable inputs when measuring fair value. The fair value framework requires the categorization of assets and liabilities into three levels based upon the assumptions (inputs) used to price the assets or liabilities. The guidance for fair value measurements requires that assets and liabilities carried at fair value be classified and disclosed in one of the following categories:
	Level 1—Quoted (unadjusted) prices in active markets for identical assets or liabilities.
	Level 2—Observable inputs other than quoted prices included in Level 1, such as quoted prices for similar assets or liabilities in active markets; quoted prices for identical or similar assets or liabilities in markets that are not active; or other inputs that are observable or can be corroborated by observable market data for substantially the full term of the asset or liability.
	Level 3—Unobservable inputs in which there is little or no market data, which requires us to develop our own assumptions.
	Level 1 measurements are obtained from real-time quotes for transactions in active exchange markets involving identical assets. Level 2 measurements are obtained from readily available pricing sources for comparable instruments, identical instruments in less active markets, or models using market observable inputs. We did not have any transfers of financial instruments between valuation levels during the nine months ended September 30, 2014 and the year ended December 31, 2013.
	As of September 30, 2014, the fair value of these financial assets measured at fair value on a recurring basis was determined using the following inputs (in thousands):
		Fair Value Measurement Using
		Quoted Prices in
		Active Markets		Significant Other		Significant
		for Identical		Observable		Unobservable
		Instruments		Inputs		Inputs
		(Level 1)		(Level 2)		(Level 3)		Total
	Cash equivalents:
	Money-market funds	$	6,197	$	—	$	—	$	6,197
	Total cash equivalents		6,197		—		—		6,197
	Short-term investments:
	U.S. government and agency obligations		—		38,701		—		38,701
	U.S. and foreign corporate debt securities		—		19,654		—		19,654
	Foreign governments and multi-national agency obligations		—		1,997		—		1,997
	Total short-term investments		—		60,352		—		60,352
Total assets measured at fair value	$	6,197	$	60,352	$	—	$	66,549
As of December 31, 2013, the fair value of these financial assets recorded at fair value on a recurring basis was determined using the following inputs (in thousands):
	Fair Value Measurement Using
	Quoted Prices in
	Active Markets		Significant Other		Significant
	for Identical		Observable		Unobservable
	Instruments		Inputs		Inputs
	(Level 1)		(Level 2)		(Level 3)		Total
Cash equivalents:
Money-market funds	$	30,250	$	—	$	—	$	30,250
Total cash equivalents		30,250		—		—		30,250
Short-term investments:
U.S. government and agency obligations		—		42,054		—		42,054
U.S. and foreign corporate debt securities		—		18,441		—		18,441
Foreign governments and multi-national agency obligations		—		2,761		—		2,761
Total short-term investments		—		63,256		—		63,256
Total assets measured at fair value	$	30,250	$	63,256	$	—	$	93,506
We periodically review our marketable debt securities for other-than-temporary impairment. We consider factors such as the duration, severity and the reason for the decline in value, the potential recovery period and our intent to sell. We also consider whether it is more likely than not that we will be required to (i) sell the debt securities before recovery of their amortized cost basis, and (ii) the amortized cost basis cannot be recovered as a result of credit losses. During the nine months ended September 30, 2014, we did not recognize any other-than-temporary impairment loss.  The following table presents gross unrealized losses and fair values for those investments that were in an unrealized loss position, aggregated by investment category and the length of time that individual securities have been in a continuous loss position (in thousands):
	As of September 30, 2014				As of December 31, 2013
	Total (Less Than 12 Months)				Total (Less Than 12 Months)
	Fair		Unrealized		Fair		Unrealized
	Value		Loss		Value		Loss
U.S. and foreign corporate debt securities	$	9,124	$	-21	$	4,247	$	-1
Foreign governments and multi-national agency obligations		1,996		-4		2,761		-3
U.S. government and agency obligations		18,854		-30		12,566		-21
Total	$	29,974	$	-55	$	19,574	$	-25
As of September 30, 2014 and December 31, 2013, there were no investments with unrealized losses for a period in excess of 12 months.

Commitments_and_Contingencies

Commitments and Contingencies	9 Months Ended
	Sep. 30, 2014
Commitments and Contingencies [Abstract]	'
Commitments and Contingencies	'
	4. Commitments and contingencies
	Operating and Capital Leases
	The future minimum commitments under our operating and capital leases were as follows (in thousands):
		30-Sep-14
		Operating Leases		Capital Leases
	2014	$	1,359	$	430
	2015		5,401		1,162
	2016		4,198		112
	2017		455		—
	2018		466		—
	2019 and thereafter		1,290		—
	Net minimum lease payments	$	13,169		1,704
	Less amount representing interest				-76
	Present value of net minimum capital lease payments			$	1,628
	Legal Contingencies
	EON Patent Litigation.  In June 2011, EON Corp. IP Holdings, LLC, a non-producing entity, or EON, filed suit in United States District Court for the Eastern District of Texas, Tyler Division against us and a number of smart grid providers. Other defendants include Landis+Gyr AG (acquired by Toshiba Corporation), Aclara Power-Line Systems Inc., Elster Solutions, LLC, Itron, Inc. and Trilliant Networks Inc.  This lawsuit alleges infringement of United States Patent Nos. 5,388,101 (the “’101 Patent”), 5,481,546 (the “’546 Patent”), and 5,592,491 (the “’491 Patent,” and together with the ‘101 Patent and the ‘546 Patent, the “EON Patents”) by certain networking technology and services that we and the other defendants provide. We filed amended answers, affirmative defenses and counterclaims in August 2012, September 2012, October 2012 and November 2012 denying the plaintiff’s allegations and asserting that the plaintiff’s patents are invalid.  All of the other named defendants in the case settled with EON prior to trial, which was held in June 2014.  After the trial, the jury determined that we had infringed certain, but not all, of the claims under the EON Patents, and returned a verdict against us in the amount of $18.8 million.  However, the court ruled that there was insufficient evidence to support EON’s allegation of willful infringement and granted our motion to dismiss that claim.  In June 2014, we filed post-trial motions with the court seeking, among other things, judgment as a matter of law to set aside the jury verdict or, in the alternative, a new trial.  In its post-trial motions, EON sought pre-judgment interest and attorneys’ fees.  All of the EON Patents have expired and therefore EON is not seeking, and EON may not recover, any additional sums as royalties for our sales of products going forward.
	In October 2014, the court issued an order under seal ruling on some of the parties’ post-trial motions.  In the ruling, the court reduced the damage award from $18.8 million to $13.0 million, and in November 2014, the court entered an order directing us to pay damages in the reduced amount.  The court has also directed EON to recompute its request for pre-judgment interest to account for the reduction in the damages award.
	We continue to believe that the evidence and the law do not support the jury’s findings of infringement, validity, and the award of damages, and intend to continue vigorously defending the action, including exercising all available appeals.  As of fiscal year ended December 31, 2013, we had accrued an immaterial charge in our financial statements for this lawsuit, and as of September 30, 2014, we had not made any further accrual related to this matter.  However, given the inherent uncertainty in predicting the ultimate outcome of post-trial motions and the appeals process, we believe it is reasonably possible that a material loss of up to $13.0 million may result from these proceedings.  In continuing to assess the impact of the jury verdict and the judge’s order on our financial statements, we will continue to evaluate the jury verdict, the court’s recent order ruling on the post-trial motions, and the likelihood of a successful appeal.
	Transdata/OG&E Patent Litigation.  In September 2011, TransData, Inc., or TransData, filed suit in United States District Court for the Western District of Oklahoma, against Oklahoma Gas & Electric Company (“OG&E”), alleging infringement of United States Patent Nos. 6,181,294, 6,462,713, and 6,903,699 by certain wireless communication-enabled meters, including General Electric Company (“GE”) meters with our wireless modules.  We have agreed with GE to contribute to the indemnification and defense of OG&E in connection with the TransData suit. An early claim construction hearing was held regarding one claim term in February 2013, which the court ruled upon in June 2013. A hearing for the full claim construction was held in September 2013, on which the court issued an order in October 2013. In May 2014, GE filed reexamination requests on the TransData patents at issue with the U.S. Patent and Trademark Office (the “USPTO”).  In October 2014, OG&E filed a motion to stay the litigation pending the reexamination of the patents by the USPTO.  We believe that OG&E has meritorious defenses to TransData’s allegations, and we intend to vigorously defend against the action together with OG&E and GE.
	Linex Patent Litigation.  In March 2013, Linex Technologies, Inc., a non-producing entity, or Linex, filed suit against us in United States District Court for the Southern District of Florida. Linex alleged that certain of our networking technology infringes United States Patent Nos. 6,493,377 and 7,167,503. We filed an answer in May 2013. In January 2014, the court granted the plaintiff’s request for a stay of the matter, pending reexamination of the patents at issue by the USPTO.  In September 2014, Linex amended certain patent claims and canceled certain other patent claims based upon the USPTO’s completed reexaminations, and in October 2014, the court lifted the stay of the matter.  The trial has been scheduled for November 2015.  We believe that we have meritorious defenses to Linex’s allegations and intend to continue vigorously defending against the action.
	Other than as described above, the Company has not recorded any amounts for contingent losses associated with the matters described above based on its belief that losses, while reasonably possible, are not probable. Unless otherwise stated, the Company is currently unable to predict the final outcome of these lawsuits and therefore cannot determine the likelihood of loss nor estimate a range of possible loss.
	We are directly involved with various unresolved legal actions and claims, and are indirectly involved with proceedings by administrative bodies such as public utility commissions, arising in the ordinary course of business. We do not believe that any liability from any reasonably foreseeable disposition of such legal actions and claims, individually or in the aggregate, would have a material effect on our consolidated financial statements. There are many uncertainties associated with any litigation or claim, and we cannot be certain that these actions or other third-party claims will be resolved without costly litigation, fines and/or substantial settlement payments. If that occurs, our business, financial condition and results of operations could be materially and adversely affected. If information becomes available that causes us to determine that a loss in any of our pending litigation matters, claims or settlements is probable, and a reasonable estimate of the loss associated with such events can be made, we will record the estimated loss at that time.
	Customer Performance and Other Commitments
	Certain customer agreements require us to obtain letters of credit or surety bonds in support of our obligations under such arrangements. These letters of credit or surety bonds typically provide a guarantee to the customer for future performance, which usually covers the deployment phase of a contract and may on occasion cover the operations and maintenance phase of service contracts.  We have available a line of credit with a bank, which provides for advances and the issuance of letters of credit of up to $50 million.  At September 30, 2014, we have not made any drawdown on our line of credit.
	During the ordinary course of business, we provide standby letters of credit or other guarantee instruments to third parties as required for certain transactions initiated either by us or ourselves.  These letters of credit or guarantee instruments are related to performance guarantees, facility leases and workers compensation insurance.  These letters of credit are subject to compliance with financial covenants and other customary conditions to borrowings. As of September 30, 2014, we were in compliance with the financial covenants in the credit agreement.  As of September 30, 2014 and December 31, 2013, we had a total of $3.2 million and $9.8 million, respectively, of standby letters of credit issued under the credit facility with a financial institution, of which $0.6 million (AUD$0.6 million) and $0.6 million (AUD$0.6 million), respectively, were denominated in Australian dollars.
	As of September 30, 2014, we had a $15.0 million unsecured surety bond. The surety bond provides a financial guarantee to support performance obligations under certain customer agreements. In the event any such letters of credit or surety bonds are called, we would be obligated to reimburse the issuer of the letter of credit or surety bond. We do not believe there will be any claims against currently outstanding letters of credit or surety bonds.
	Our contracts with customers and meter manufacturers typically contain provisions that could result in payments or other liabilities related to late or improper delivery of products, services, installations or operations or failure to meet product or performance specifications or other product defects. Any payments made to customers pursuant to the terms of these provisions are recorded as reductions of deferred revenue.
	Indemnification Commitments
	Directors, Officers and Employees. In accordance with our bylaws and/or pursuant to indemnification agreements we have entered into with directors, officers and certain employees, we have indemnification obligations to our directors, officers and certain employees for claims brought against these persons arising out of certain events or occurrences while they are serving at our request in such a capacity. We maintain director and officer liability insurance coverage to reduce our exposure to such obligations, and payments made under indemnification agreements. To date, there have been no indemnification claims by these directors, officers and employees.
	Customers and Meter Manufacturers. Our contracts with customers and meter manufacturers typically provide indemnification for claims filed by third parties alleging that our products and services sold to the customer or manufacturer infringe or misappropriate any patent, copyright, trademark or other intellectual property right. Refer to the discussion above under the heading “Legal Contingencies” for a description of certain matters involving our indemnification obligations.
	In our customer contracts, we also typically provide an indemnification for third-party claims resulting from death, personal injury or property damage caused by the negligence or willful misconduct of our employees and agents in connection with the performance of certain contracts.
	Under our customer and meter manufacturer indemnities, we typically agree to defend the customer or meter manufacturer, as the case may be, from such claims, and pay any resulting costs, damages and attorneys’ fees awarded against the indemnified party with respect to such claims, provided that (a) the indemnified party promptly notifies us in writing of the claim, (b) the indemnified party provides reasonable assistance to us at our expense, and (c) we have sole control of the defense and all related settlement negotiations.
	Insurance. We maintain various insurance coverage policies, subject to policy limits and certain conditions that enable us to recover a portion of amounts paid by us in connection with our obligation to indemnify our customers and meter manufacturers. However, because our maximum liability associated with such indemnification obligations generally is not stated explicitly in the related agreements, and further because many states prohibit limitations of liability for such indemnified claims, the maximum potential amount of future payments we could be required to make under these indemnification provisions could significantly exceed insurance policy limits.
	Historically, payments made by us under these indemnification provisions have not had a material effect on our results of operations, financial position or cash flows.

StockBased_Compensation

Stock-Based Compensation	9 Months Ended
	Sep. 30, 2014
Stock-Based Compensation [Abstract]	'
Stock-Based Compensation	'
	5. Stock-Based Compensation
	Equity Incentive Plan and Employee Stock Purchase Plan
	Our Board of Directors adopted the 2012 Equity Incentive Plan, or the 2012 Plan, which became effective on March 12, 2013 and serves as the successor to our 2003 Stock Option Plan, or the 2003 Plan. Pursuant to the 2012 Plan, 3,400,000 shares of our common stock were initially reserved for grant, plus (1) any shares that were reserved and available for issuance under the 2003 Plan at the time the 2012 Plan became effective, and (2) any shares that become available upon forfeiture or repurchase by us under the 2003 Plan and a stock option plan assumed in connection with a previous acquisition, will be reserved for issuance. Under the 2012 Plan, we may grant both incentive and non-statutory stock options, restricted stock and restricted stock units to employees, directors and service providers. We may grant options to purchase shares of common stock to employees, directors and service providers at prices not less than the fair market value at date of grant for both Incentive Stock Options, or ISOs, or Nonqualified Stock Options, or NQSOs. ISOs granted to a person who, at the time of the grant, owns more than 10% of the voting power of all classes of stock must be at no less than 110% of the fair market value and expire five years from the date of grant. All other options generally have a contractual term of 10 years. Options generally vest over four years. Restricted stock units, or RSUs, generally vest between two to four years. We have also granted to certain executive officers awards with performance and service-based conditions.  The potential shares to be awarded related to performance-based awards are derived from fiscal 2014 operating performance metrics which will be determined at the end of the year.  As of September 30, 2014 and December 31, 2013, there were 3.6 million and 2.5 million shares, respectively, of common stock reserved for future issuance under our stock plan.
	Our Board of Directors adopted the 2012 Employee Stock Purchase Plan, or ESPP, which became effective on March 12, 2013, pursuant to which 400,000 shares of our common stock have been reserved for future issuance. Eligible employees can enroll and elect to contribute up to 15% of their compensation through payroll withholdings in each offering period, subject to certain limitations. Each offering period is six months in duration, with the exception of the initial offering period, which commenced in March 2013 upon the date our IPO was declared effective and that ended on February 14, 2014.  The purchase price of the stock is the lower of 85% of the fair market value on (a) the first day of the offering period or (b) the purchase date.
	We recorded stock-based compensation expense as follows (in thousands):
		Three Months Ended						Nine Months Ended
		September 30,						September 30,
		2014			2013			2014			2013
	Cost of revenue	$	2,770		$	1,376		$	7,392		$	10,631
	Research and development		3,042			1,905			8,892			15,056
	Sales and marketing		1,783			950			5,582			5,822
	General and administrative		2,881			2,759			9,604			12,994
	Stock-based compensation expense	$	10,476		$	6,990		$	31,470		$	44,503
	The following table summarizes our stock option activity and related information for the nine months ended September 30, 2014 (in thousands, except per share data):
		Options Outstanding
				Weighted			Weighted
				Average			Average
				Exercise			Remaining		Aggregate
		Number of		Price per			Contractual		Intrinsic
		Shares		Share			Term (years)		Value
	Balance at December 31, 2013	4,726		$	11.88
	Options granted	732			14.67
	Options exercised	-284			3.31
	Options cancelled or expired	-316			17.83
	Balance at September 30, 2014	4,858		$	12.41		5.81		$	11,176
	As of September 30, 2014:
	Options vested and expected to vest	4,770		$	12.34		5.74		$	11,176
	Options exercisable	3,515		$	10.86		4.63		$	11,176
	The following table summarizes our restricted stock unit activity and related information for the nine months ended September 30, 2014 (in thousands, except per share data):
		Restricted Stock
		Units Outstanding
				Weighted
				Average Grant
		Number of		Date Fair Value
		Shares		per Share
	Balance at December 31, 2013	2,759		$	19.14
	Restricted stock units granted	1,085			13.18
	Restricted stock units vested	-912			17.46
	Restricted stock units cancelled	-375			17.94
	Balance at September 30, 2014	2,557		$	17.36
	In March 2013, as approved by our Board of Directors, we modified certain stock options held by employees and directors to purchase 1,752,895 shares of our common stock with an exercise price of $34.90 per share or greater to reduce the exercise price to $17.00 per share, the IPO price. There were no changes to vesting terms or conditions. As a result of the modification to these stock options, we incurred an incremental charge to stock-based compensation of $5.5 million and $4.1 million for the nine months ended September 30, 2014 and 2013, respectively, and expect to incur $0.3 million of incremental stock-based compensation over a weighted average period of 0.7 years.
	As of September 30, 2014, there was $10.2 million and $24.5 million of total unrecognized compensation cost related to non-vested stock-based compensation arrangements related to options and RSUs, respectively, which are expected to be recognized over a weighted-average period of 3.0 and 2.0 years, respectively.

Income_Taxes

Income Taxes	9 Months Ended
	Sep. 30, 2014
Income Taxes [Abstract]	'
Income Taxes	'
	6. Income Taxes
	Our provision for income taxes for the three months ended September 30, 2014 and 2013 reflects an effective tax rate of 0.4% and (0.8)%, respectively.  Our provision for income taxes for the three months ended September 30, 2014 consists primarily of withholding taxes, offset by a tax benefit related to foreign losses, while our provision for income taxes for the three months ended September 30, 2013 consisted primarily of foreign income and withholding taxes.  Our provision for income taxes for the nine months ended September 30, 2014 and 2013 reflects an effective tax rate of (0.5)% and (0.7)%, respectively, and consists primarily of foreign income and withholding taxes.

Business_Acquisition

Business Acquisition	9 Months Ended
	Sep. 30, 2014
Business Acquisition [Abstract]	'
Business Acquisition	'
	7. Business Acquisition
	On May 6, 2014, we entered into a purchase agreement to acquire 100% of the outstanding shares of Streetlight.Vision (“SLV”), a company incorporated under the laws of France, which provides street light control and management software. On May 23, 2014, we completed the acquisition of SLV, a société par actions simplifiée, and paid approximately $8.8 million in cash, of which $2.6 million was deposited in an escrow account to satisfy indemnification claims that we may have for a period 24 months pursuant to the terms of the purchase agreement.  If there remains more than $1.3 million in the escrow account 12 months after the completion of the acquisition after taking into account any pending indemnification claims, such amount over $1.3 million shall be paid to the SLV shareholders.  The remaining $1.3 million will be paid to the SLV shareholders after the conclusion of the 24-month period, subject to any pending indemnification claims.
	In accordance with ASC 805, Business Combinations, the acquisition of SLV was recorded as a purchase business acquisition since SLV was considered a business. Under the purchase method of accounting, the fair value of the consideration was allocated to net assets acquired at their fair values. The results of operations of SLV, which are not material for the nine months ended September 30, 2014, are included in our consolidated financial results.
	The $8.8 million total consideration was preliminarily allocated primarily to $4.7 million, $4.3 million, and $(0.2) million of goodwill, intangible assets, and net liabilities, respectively.

Restructuring_Charges

Restructuring Charges	9 Months Ended
	Sep. 30, 2014
Restructuring Charges [Abstract]	'
Restructuring Charges	'
	8. Restructuring Charges
	The following table presents restructuring and other charges included in cost of revenues and restructuring and other charges in the Condensed Consolidated Statements of Operations (in thousands):
		Three Months Ended				Nine Months Ended
		September 30,				September 30,
		2014		2013		2014		2013
	Severance	$	1,888	$	—	$	1,888	$	—
	Other		117		—		17		—
	Total restructuring and other	$	2,005	$	—	$	1,905	$	—
	Activity in our restructuring reserve is summarized as follows (in thousands):
			Balance		Additions		Utilization		Balance
			31-Dec-13						30-Sep-14
	Fiscal 2014 Plan
	Severance reserve (1)	$	—		1,888		-1,026		862
	(1)   The reserve is recorded in the Condensed Consolidated Balance Sheets under "Accrued liabilities."
	Restructuring and other charges noted above are based on our 2014 Restructuring Plan (as defined below). Any changes in the estimates of executing the approved plans are reflected in our results of operations.
	2014 Restructuring Plan
	During the three months ended September 30, 2014, we initiated a restructuring plan (the “2014 Restructuring Plan”) to refocus our strategy, optimize our structure, and improve operational efficiencies.
	During the three and nine months ended September 30, 2014, we recorded $1.9 million of severance costs to restructuring and other charges in the Condensed Consolidated Statement of Operations.
	In connection with the 2014 Restructuring Plan, we expect to record aggregate future charges of approximately $1.6 million to $2.1 million of additional severance.
	The remaining restructuring costs under the 2014 Restructuring Plan are expected to be incurred by the first half of 2015.

Description_of_Business_and_Su1

Description of Business and Summary of Significant Accounting Policies (Policies)	9 Months Ended
	Sep. 30, 2014
Financial Instruments [Abstract]	'
Reverse Stock Split	'
	Reverse Stock Split
	Prior to our initial public offering (“IPO”) in March 2013, our Board of Directors and holders of the requisite number of outstanding shares of our capital stock approved an amendment to our restated certificate of incorporation to effect a 5-for-1 reverse stock split of our outstanding capital stock. The reverse stock split was effected on February 11, 2013 and did not result in an adjustment to par value. The reverse stock split is reflected in the accompanying condensed consolidated financial statements and related notes on a retroactive basis for all periods presented.
Accounting Principles and Basis of Presentation	'
	Accounting Principles and Basis of Presentation
	The accompanying unaudited condensed consolidated financial statements have been prepared in accordance with generally accepted accounting principles in the United States (“GAAP”) and applicable rules and regulations of the Securities and Exchange Commission (“SEC”) regarding interim financial reporting. Certain information and note disclosures normally included in the consolidated financial statements prepared in accordance with GAAP have been condensed or omitted pursuant to such rules and regulations. As such, the information included in this Quarterly Report on Form 10-Q should be read in conjunction with the consolidated financial statements and accompanying notes included in our Annual Report on Form 10-K for the year ended December 31, 2013.
	The condensed consolidated balance sheet as of December 31, 2013, included herein, was derived from the audited financial statements as of that date, but does not include all disclosures including notes required by GAAP.
	The condensed consolidated financial statements include the accounts of Silver Spring Networks, Inc. and its wholly owned subsidiaries. All intercompany balances and transactions have been eliminated.
	The accompanying unaudited condensed consolidated financial statements reflect all normal recurring adjustments necessary to present fairly the financial position, results of operations, comprehensive income (loss), and cash flows for the interim periods but are not necessarily indicative of the results of operations to be anticipated for the full year ending December 31, 2014.
	There have been no changes to our significant accounting policies described in the Annual Report on Form 10-K that have had a material impact on our condensed consolidated financial statements and related notes.
Use of Estimates	'
	Use of Estimates
	The preparation of financial statements in conformity with GAAP requires management to make estimates and assumptions that affect the reported amounts of assets and liabilities, contingent assets and liabilities, and revenue and expenses during the reporting period. Estimates are used for revenue and cost recognition, inventory valuation, warranty obligations, stock-based compensation, classification of current and non-current deferred revenue and deferred cost of revenue, intangible assets, income taxes and deferred income tax assets and associated valuation allowances. These estimates generally involve complex issues and require judgments, involve the analysis of historical and prediction of future trends, can require extended periods of time to resolve and are subject to change from period to period. Actual results may differ materially from management’s estimates.
Inventory	'
	Inventory
	Inventory is stated at the lower of cost or market.  Inventory consisted of the following (in thousands):
		September 30,		December 31,
		2014		2013
	Component parts	$	1,945	$	690
	Finished goods		2,566		3,660
	Inventory	$	4,511	$	4,350
	Total inventory also included consigned inventory of $ 3.7 million and $2.8 million as of September 30, 2014 and December 31, 2013, respectively.
Product Warranty	'
	Product Warranty
	We provide warranties for substantially all of our products. Our standard warranty period extends from one to five years. We accrue for costs of standard warranty at the time of product shipment and record changes in estimates to warranty accruals when it is probable a liability has been incurred and the amount of loss can be reasonably estimated.
	Product warranty obligation is presented as follows on the condensed consolidated balance sheets (in thousands):
		September 30,		December 31,
		2014		2013
	Current warranty obligation—classified in accrued liabilities	$	4,126	$	2,985
	Non-current warranty obligation—classified in other liabilities		3,157		3,104
		$	7,283	$	6,089
	Product warranty activity was as follows (in thousands):
		Nine Months Ended
		September 30,
		2014		2013
	Warranty obligation—beginning of period	$	6,089	$	6,316
	Warranty expense for new warranties issued		506		1,107
	Utilization of warranty obligation		-2,101		-1,288
	Changes in estimates for pre-existing warranties		2,789		178
	Warranty obligation—end of period	$	7,283	$	6,313
	During the nine months ended September 30, 2014 and 2013, we revised our estimated warranty liability to reflect changes in cost estimates and, to a lesser extent, product field reliability experience and recorded an increase (reduction) of product warranty liability and product cost of revenue of $2.8 million and $0.2 million, respectively.
	At the time of product shipment, we estimate and accrue for the amount of standard warranty cost and record the amount as a cost of revenue. Determining the amount of warranty costs requires management to make estimates and judgments based on historical claims experience, industry benchmarks, test data and various other assumptions including estimated field failure rates that are believed to be reasonable under the circumstances. The amount of warranty costs accrued are net of warranty obligations to be fulfilled by our suppliers. The results of these judgments formed the basis for our estimate of the total charge to cover anticipated customer warranty, repair, return and replacement and other associated costs. Should actual product failure rates, claim levels, material usage or supplier warranties on parts used in our products differ from our original estimates, revisions to the estimated warranty liability could result in adjustments to our cost of revenue in future periods.
	Certain of our standard product warranty obligations require us to reimburse a customer for installation and other related costs in the event that field reliability rates fall below contractually specified thresholds. We consider the probability that we will have to pay such incremental warranty costs based on the expected performance of a delivered product when we record new warranty obligations issued in a period as well as when we determine if any changes are required to our original estimates for pre-existing warranty obligations.
	Our warranty obligations are affected by product failure rates, claims levels, material usage and supplier warranties on parts included in our products. Because our products are relatively new and we do not have the benefit of long-term experience observing the products’ performance in the field, it is possible that the estimates of a product’s lifespan and incidence of claims could vary from period to period.
	In certain customer arrangements, we have provided extended warranties for periods of up to 15 years following the initial standard warranty period. We recognize revenue associated with extended warranties over the extended warranty period when the extended warranty period commences. Costs associated with providing extended warranties are expensed as incurred during the extended warranty period. As of September 30, 2014 and December 31, 2013, we had deferred revenue associated with extended warranty arrangements of $0.5 million and $0.2 million, respectively, included in other current liabilities, and $8.0 million and $7.1 million, respectively, included in other long-term liabilities on our condensed consolidated balance sheets.
Conversion of Convertible Promissory Notes and Embedded Derivatives	'
	Conversion of Convertible Promissory Notes and Embedded Derivatives
	In connection with our IPO in March 2013, the conversion of the convertible notes and issuance of common stock were accounted for as debt extinguishments and accordingly, the convertible notes, unamortized debt issuance costs and bifurcated compound embedded derivatives were removed at their respective carrying amounts and the shares of common stock issued were measured at fair value based on the closing price on the date our IPO closed. As a result, we recorded a loss on debt extinguishments of $22.9 million in the three months ended March 31, 2013.
Accumulated Other Comprehensive Income (AOCI)	'
	Accumulated Other Comprehensive Income (AOCI)
	The components of AOCI, net of tax, were as follows (in thousands):
				Unrealized Gains
		Foreign Currency		(Losses) on Available
		Adjustment		for Sale Securities		Total
	Balance as of December 31, 2013	$	46	$	84	$	130
	Other comprehensive income before reclassification		63		-13		50
	Amounts reclassified from AOCI		—		-116		-116
	Other comprehensive income (loss)		63		-129		-66
	Balance as of September 30, 2014	$	109	$	-45	$	64
Other Long-Term Assets	'
	Other Long-Term Assets
	Other long-term assets consisted of the following:
		September 30,		December 31,
		2014		2013
	Acquired intangible assets, net	$	4,130	$	224
	Goodwill		5,131		447
	Prepaid expenses, deposits, and receivables, non-current		1,142		896
	Other long-term assets	$	10,403	$	1,567
Recent Accounting Pronouncements	'
	Recent Accounting Pronouncements
	In May 2014, the Financial Accounting Standards Board issued guidance related to revenue from contracts with customers, which supersedes the revenue recognition requirements in ASC 605, Revenue Recognition. Under this guidance, revenue is recognized when promised goods or services are transferred to customers in an amount that reflects the consideration that is expected to be received for those goods or services. The new guidance also requires additional disclosure about the nature, amount, timing and uncertainty of revenue and cash flows arising from customer contracts, including significant judgments and changes in judgments and assets recognized from costs incurred to obtain or fulfill a contract.  The updated standard will replace most existing revenue recognition guidance under GAAP when it becomes effective and permits the use of either the full retrospective or cumulative effect transition method. Early adoption is not permitted. The updated standard will be effective for us in the first quarter of 2017. We have not yet selected a transition method and we are currently evaluating the effect that the updated standard will have on our consolidated financial statements and related disclosures.

Description_of_Business_and_Su2

Description of Business and Summary of Significant Accounting Policies (Tables)	9 Months Ended
	Sep. 30, 2014
Description of Business and Summary of Significant Accounting Policies [Abstract]	'
Components of Inventory	'
		September 30,		December 31,
		2014		2013
	Component parts	$	1,945	$	690
	Finished goods		2,566		3,660
	Inventory	$	4,511	$	4,350
Schedule of Product Warranty Obligation as Presented in Condensed Consolidated Balance Sheets	'
		September 30,		December 31,
		2014		2013
	Current warranty obligation—classified in accrued liabilities	$	4,126	$	2,985
	Non-current warranty obligation—classified in other liabilities		3,157		3,104
		$	7,283	$	6,089
Schedule of Product Warranty Activity	'
		Nine Months Ended
		September 30,
		2014		2013
	Warranty obligation—beginning of period	$	6,089	$	6,316
	Warranty expense for new warranties issued		506		1,107
	Utilization of warranty obligation		-2,101		-1,288
	Changes in estimates for pre-existing warranties		2,789		178
	Warranty obligation—end of period	$	7,283	$	6,313
Schedule of Accumulated Other Comprehensive Income Loss	'
				Unrealized Gains
		Foreign Currency		(Losses) on Available
		Adjustment		for Sale Securities		Total
	Balance as of December 31, 2013	$	46	$	84	$	130
	Other comprehensive income before reclassification		63		-13		50
	Amounts reclassified from AOCI		—		-116		-116
	Other comprehensive income (loss)		63		-129		-66
	Balance as of September 30, 2014	$	109	$	-45	$	64
Schedule of Other Long-Term Assets	'
		September 30,		December 31,
		2014		2013
	Acquired intangible assets, net	$	4,130	$	224
	Goodwill		5,131		447
	Prepaid expenses, deposits, and receivables, non-current		1,142		896
	Other long-term assets	$	10,403	$	1,567

Net_Income_Loss_Per_Share_Tabl

Net Income (Loss) Per Share (Tables)	9 Months Ended
	Sep. 30, 2014
Net Income (Loss) Per Share [Abstract]	'
Computation of Historical Basic and Diluted Net Loss Per Share	'
		Three Months Ended				Nine Months Ended
		September 30,				September 30,
		2014		2013		2014		2013
	Net loss	$	-37,273	$	-12,269	$	-89,671	$	-67,165
	Deemed dividend to convertible preferred stockholders		—		—		—		-105,000
	Net loss available to common stockholders	$	-37,273	$	-12,269	$	-89,671	$	-172,165
	Weighted average common shares outstanding—basic		48,551		46,729		48,189		34,733
	Weighted average common shares outstanding—diluted		48,551		46,729		48,189		34,733
	Basic loss per common share	$	-0.77	$	-0.26	$	-1.86	$	-4.96
	Diluted loss per common share	$	-0.77	$	-0.26	$	-1.86	$	-4.96
Common Shares Outstanding were Excluded from Computation of Diluted Net Loss Per Share	'
		September 30,
		2014		2013
	Employee equity incentive plans		7,512		6,749
	Total common stock equivalents		7,512		6,749

Financial_Instruments_Tables

Financial Instruments (Tables)	9 Months Ended
	Sep. 30, 2014
Financial Instruments [Abstract]	'
Cash, Cash Equivalents and Short-Term Investments	'
		As of September 30, 2014
		Amortized		Unrealized		Unrealized		Estimated
		Cost		Gains		Losses		Fair Value
	Current assets:
	Cash	$	43,917	$	—	$	—	$	43,917
	Cash equivalents:
	Money market mutual funds		6,197		—		—		6,197
	Total cash equivalents		6,197		—		—		6,197
	Short-term fixed income securities:
	U.S. government and agency obligations		38,686		45		-30		38,701
	U.S. and foreign corporate debt securities		19,659		16		-21		19,654
	Foreign governments and multi-national agency obligations		2,001		—		-4		1,997
	Total short-term investments		60,346		61		-55		60,352
	Total cash, cash equivalents and short-term investments	$	110,460	$	61	$	-55	$	110,466
		As of December 31, 2013
		Amortized		Unrealized		Unrealized		Estimated
		Cost		Gains		Losses		Fair Value
	Current assets:
	Cash	$	52,346	$	—	$	—	$	52,346
	Cash equivalents:
	Money market mutual funds		30,250		—		—		30,250
	Total cash equivalents		30,250		—		—		30,250
	Short-term fixed income securities:
	U.S. government and agency obligations		41,991		84		-21		42,054
	U.S. and foreign corporate debt securities		18,366		76		-1		18,441
	Foreign governments and multi-national agency obligations		2,764		—		-3		2,761
	Total short-term investments		63,121		160		-25		63,256
	Total cash, cash equivalents and short-term investments	$	145,717	$	160	$	-25	$	145,852
Contractual Maturities of Cash Equivalents and Short-Term Investments	'
		30-Sep-14				31-Dec-13
		Amortized		Aggregate		Amortized		Aggregate
		Cost Basis		Fair Value		Cost Basis		Fair Value
	Due within one year	$	21,981	$	21,996	$	44,477	$	44,474
	Due after 1 year through 3 years		44,562		44,553		48,894		49,032
	Total cash equivalents & short-term investments	$	66,543	$	66,549	$	93,371	$	93,506
Fair Value of Financial Assets Recorded on Recurring Basis	'
		Fair Value Measurement Using
		Quoted Prices in
		Active Markets		Significant Other		Significant
		for Identical		Observable		Unobservable
		Instruments		Inputs		Inputs
		(Level 1)		(Level 2)		(Level 3)		Total
	Cash equivalents:
	Money-market funds	$	6,197	$	—	$	—	$	6,197
	Total cash equivalents		6,197		—		—		6,197
	Short-term investments:
	U.S. government and agency obligations		—		38,701		—		38,701
	U.S. and foreign corporate debt securities		—		19,654		—		19,654
	Foreign governments and multi-national agency obligations		—		1,997		—		1,997
	Total short-term investments		—		60,352		—		60,352
	Total assets measured at fair value	$	6,197	$	60,352	$	—	$	66,549
	As of December 31, 2013, the fair value of these financial assets recorded at fair value on a recurring basis was determined using the following inputs (in thousands):
		Fair Value Measurement Using
		Quoted Prices in
		Active Markets		Significant Other		Significant
		for Identical		Observable		Unobservable
		Instruments		Inputs		Inputs
		(Level 1)		(Level 2)		(Level 3)		Total
	Cash equivalents:
	Money-market funds	$	30,250	$	—	$	—	$	30,250
	Total cash equivalents		30,250		—		—		30,250
	Short-term investments:
	U.S. government and agency obligations		—		42,054		—		42,054
	U.S. and foreign corporate debt securities		—		18,441		—		18,441
	Foreign governments and multi-national agency obligations		—		2,761		—		2,761
	Total short-term investments		—		63,256		—		63,256
	Total assets measured at fair value	$	30,250	$	63,256	$	—	$	93,506
Schedule of Gross Unrealized Losses and Fair Values of Investments	'
		As of September 30, 2014				As of December 31, 2013
		Total (Less Than 12 Months)				Total (Less Than 12 Months)
		Fair		Unrealized		Fair		Unrealized
		Value		Loss		Value		Loss
	U.S. and foreign corporate debt securities	$	9,124	$	-21	$	4,247	$	-1
	Foreign governments and multi-national agency obligations		1,996		-4		2,761		-3
	U.S. government and agency obligations		18,854		-30		12,566		-21
	Total	$	29,974	$	-55	$	19,574	$	-25

Commitments_and_Contingencies_

Commitments and Contingencies (Tables)	9 Months Ended
	Sep. 30, 2014
Commitments and Contingencies [Abstract]	'
Future Minimum Commitments under Operating and Capital Leases	'
		30-Sep-14
		Operating Leases		Capital Leases
	2014	$	1,359	$	430
	2015		5,401		1,162
	2016		4,198		112
	2017		455		—
	2018		466		—
	2019 and thereafter		1,290		—
	Net minimum lease payments	$	13,169		1,704
	Less amount representing interest				-76
	Present value of net minimum capital lease payments			$	1,628

StockBased_Compensation_Tables

Stock-Based Compensation (Tables)	9 Months Ended
	Sep. 30, 2014
Stock-Based Compensation [Abstract]	'
Stock-Based Compensation Expense	'
		Three Months Ended						Nine Months Ended
		September 30,						September 30,
		2014			2013			2014			2013
	Cost of revenue	$	2,770		$	1,376		$	7,392		$	10,631
	Research and development		3,042			1,905			8,892			15,056
	Sales and marketing		1,783			950			5,582			5,822
	General and administrative		2,881			2,759			9,604			12,994
	Stock-based compensation expense	$	10,476		$	6,990		$	31,470		$	44,503
Summary of Stock Option Activity	'
		Options Outstanding
				Weighted			Weighted
				Average			Average
				Exercise			Remaining		Aggregate
		Number of		Price per			Contractual		Intrinsic
		Shares		Share			Term (years)		Value
	Balance at December 31, 2013	4,726		$	11.88
	Options granted	732			14.67
	Options exercised	-284			3.31
	Options cancelled or expired	-316			17.83
	Balance at September 30, 2014	4,858		$	12.41		5.81		$	11,176
	As of September 30, 2014:
	Options vested and expected to vest	4,770		$	12.34		5.74		$	11,176
	Options exercisable	3,515		$	10.86		4.63		$	11,176
Summary of Restricted Stock Unit Activity	'
		Restricted Stock
		Units Outstanding
				Weighted
				Average Grant
		Number of		Date Fair Value
		Shares		per Share
	Balance at December 31, 2013	2,759		$	19.14
	Restricted stock units granted	1,085			13.18
	Restricted stock units vested	-912			17.46
	Restricted stock units cancelled	-375			17.94
	Balance at September 30, 2014	2,557		$	17.36

Restructuring_Charges_Tables

Restructuring Charges (Tables)	9 Months Ended
	Sep. 30, 2014
Restructuring Charges [Abstract]	'
Restructuring And Other Charges	'
		Three Months Ended				Nine Months Ended
		September 30,				September 30,
		2014		2013		2014		2013
	Severance	$	1,888	$	—	$	1,888	$	—
	Other		117		—		17		—
	Total restructuring and other	$	2,005	$	—	$	1,905	$	—
Restructuring Reserve Activity	'
			Balance		Additions		Utilization		Balance
			31-Dec-13						30-Sep-14
	Fiscal 2014 Plan
	Severance reserve (1)	$	—		1,888		-1,026		862
	(1)   The reserve is recorded in the Condensed Consolidated Balance Sheets under "Accrued liabilities."

Description_of_Business_and_Su3

Description of Business and Summary of Significant Accounting Policies - (Narrative) (Detail) (USD $)	9 Months Ended
	Sep. 30, 2014	Sep. 30, 2013	Dec. 31, 2013
Description Of Business And Summary Of Significant Accounting Policies [Line Items]	'	'	'
Reverse stock split	'	5	'
Finished goods	$2,566,000	'	$3,660,000
Extended product warranty period	'15 years	'	'
Changes in estimates for pre-existing warranties	2,789,000	178,000	'
Extended warranty arrangements	500,000	'	200,000
Loss on debt extinguishments	'	22,900,000	'
Other Current Liabilities [Member]	'	'	'
Description Of Business And Summary Of Significant Accounting Policies [Line Items]	'	'	'
Extended warranty arrangements	8,000,000	'	'
Other Noncurrent Liabilities [Member]	'	'	'
Description Of Business And Summary Of Significant Accounting Policies [Line Items]	'	'	'
Extended warranty arrangements	'	'	7,100,000
Consigned inventory [Member]	'	'	'
Description Of Business And Summary Of Significant Accounting Policies [Line Items]	'	'	'
Finished goods	$3,700,000	'	$2,800,000
Minimum [Member]	'	'	'
Description Of Business And Summary Of Significant Accounting Policies [Line Items]	'	'	'
Standard warranty period	'1 year	'	'
Maximum [Member]	'	'	'
Description Of Business And Summary Of Significant Accounting Policies [Line Items]	'	'	'
Standard warranty period	'5 years	'	'

Description_of_Business_and_Su4

Description of Business and Summary of Significant Accounting Policies - (Components of Inventory) (Detail) (USD $)	Sep. 30, 2014	Dec. 31, 2013
In Thousands, unless otherwise specified
Inventory Disclosure [Abstract]	'	'
Component parts	$1,945	$690
Finished goods	2,566	3,660
Inventory	$4,511	$4,350

Description_of_Business_and_Su5

Description of Business and Summary of Significant Accounting Policies - (Schedule of Product Warranty Obligation) (Detail) (USD $)	Sep. 30, 2014	Dec. 31, 2013	Sep. 30, 2013	Dec. 31, 2012
In Thousands, unless otherwise specified
Guarantor Obligations [Line Items]	'	'	'	'
Warranty obligation	$7,283	$6,089	$6,313	$6,316
Accrued liabilities [Member]	'	'	'	'
Guarantor Obligations [Line Items]	'	'	'	'
Warranty obligation	4,126	2,985	'	'
Other liabilities [Member]	'	'	'	'
Guarantor Obligations [Line Items]	'	'	'	'
Warranty obligation	$3,157	$3,104	'	'

Description_of_Business_and_Su6

Description of Business and Summary of Significant Accounting Policies - (Schedule of Product Warranty Activity) (Detail) (USD $)	9 Months Ended
In Thousands, unless otherwise specified	Sep. 30, 2014	Sep. 30, 2013
Commitments and Contingencies [Abstract]	'	'
Warranty obligation-beginning of period	$6,089	$6,316
Warranty expense for new warranties issued	506	1,107
Utilization of warranty obligation	-2,101	-1,288
Changes in estimates for pre-existing warranties	2,789	178
Warranty obligation-end of period	$7,283	$6,313

Description_of_Business_and_Su7

Description of Business and Summary of Significant Accounting Policies - (Schedule of Accumulated Other Comprehensive Income Loss) (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
Accumulated Other Comprehensive Income (Loss) [Line Items]	'	'	'	'
Balance as of December 31, 2013	'	'	$130	'
Other comprehensive income before reclassification	'	'	50	'
Amounts reclassified from AOCI	'	'	-116	'
Other comprehensive income (loss)	1	69	-66	176
Balance as of September 30, 2014	64	'	64	'
Foreign Currency Translation Adjustments [Member]	'	'	'	'
Accumulated Other Comprehensive Income (Loss) [Line Items]	'	'	'	'
Balance as of December 31, 2013	'	'	46	'
Other comprehensive income before reclassification	'	'	63	'
Other comprehensive income (loss)	'	'	63	'
Balance as of September 30, 2014	109	'	109	'
Unrealized Gains on Available for Sale Securities [Member]	'	'	'	'
Accumulated Other Comprehensive Income (Loss) [Line Items]	'	'	'	'
Balance as of December 31, 2013	'	'	84	'
Other comprehensive income before reclassification	'	'	-13	'
Amounts reclassified from AOCI	'	'	-116	'
Other comprehensive income (loss)	'	'	-129	'
Balance as of September 30, 2014	($45)	'	($45)	'

Description_of_Business_and_Su8

Description of Business and Summary of Significant Accounting Policies (Schedule of Other Long-Term Assets) (Details) (USD $)	Sep. 30, 2014	Dec. 31, 2013
In Thousands, unless otherwise specified
Description of Business and Summary of Significant Accounting Policies [Abstract]	'	'
Acquired intangible assets, net	$4,130	$224
Goodwill	5,131	447
Prepaid expenses, deposits, and receivables, non-current	1,142	896
Other long-term assets	$10,403	$1,567

Net_Income_Loss_Per_Share_Comp

Net Income (Loss) Per Share - (Computation of Basic and Diluted Net Loss Per Share) (Detail) (USD $)	3 Months Ended		9 Months Ended
Share data in Thousands, except Per Share data, unless otherwise specified	Sep. 30, 2014	Sep. 30, 2013	Sep. 30, 2014	Sep. 30, 2013
Net Income (Loss) Per Share [Abstract]	'	'	'	'
Net loss	($37,273,000)	($12,269,000)	($89,671,000)	($67,165,000)
Deemed dividend to convertible preferred shareholders	'	'	'	-105,000,000
Net loss attributable to common stockholders	-37,273,000	-12,269,000	-89,671,000	-172,165,000
Weighted average common shares outstanding—basic	48,551	46,729	48,189	34,733
Weighted average common shares outstanding—diluted	48,551	46,729	48,189	34,733
Basic loss per common share	($0.77)	($0.26)	($1.86)	($4.96)
Diluted loss per common share	($0.77)	($0.26)	($1.86)	($4.96)
Common stock dividend	'	'	$105,000,000	'

Net_Income_Loss_Per_Share_Comm

Net Income (Loss) Per Share - (Common Shares Outstanding were Excluded from Computation of Diluted Net Loss Per Share) (Detail)	9 Months Ended
In Thousands, unless otherwise specified	Sep. 30, 2014	Sep. 30, 2013
Employee equity incentive plans [Member]	'	'
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items]	'	'
Total common stock equivalents	7,512	6,749
Warrants to purchase convertible preferred stock [Member]	'	'
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items]	'	'
Total common stock equivalents	7,512	6,749

Financial_Instruments_Narrativ

Financial Instruments - (Narrative) (Detail) (USD $)	9 Months Ended	12 Months Ended
	Sep. 30, 2014	Dec. 31, 2013	Sep. 30, 2014	Sep. 30, 2013	Sep. 30, 2014	Sep. 30, 2013	Sep. 30, 2014	Sep. 30, 2013
			Financial institution One [Member]	Financial institution One [Member]	Financial institution Two [Member]	Financial institution Two [Member]	Financial Institution Three [Member]	Financial Institution Three [Member]
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]	'	'	'	'	'	'	'	'
Percentage of cash and cash equivalents held in financial institutions	'	'	45.00%	41.00%	42.00%	34.00%	5.00%	21.00%
Unrealized losses on investments	$0	$0	'	'	'	'	'	'

Financial_Instruments_Cash_Cas

Financial Instruments - (Cash, Cash Equivalents and Short-Term Investments) (Detail) (Fair value on a recurring basis [Member], USD $)	Sep. 30, 2014	Dec. 31, 2013
In Thousands, unless otherwise specified
Schedule Of Available For Sale Securities [Line Items]	'	'
Amortized Cost	$110,460	$145,717
Unrealized Gains	61	160
Unrealized Losses	-55	-25
Estimated Fair Value	110,466	145,852
Cash [Member]	'	'
Schedule Of Available For Sale Securities [Line Items]	'	'
Amortized Cost	43,917	52,346
Estimated Fair Value	43,917	52,346
Cash equivalents [Member]	'	'
Schedule Of Available For Sale Securities [Line Items]	'	'
Amortized Cost	6,197	30,250
Estimated Fair Value	6,197	30,250
Cash equivalents [Member] | Money market mutual funds [Member]	'	'
Schedule Of Available For Sale Securities [Line Items]	'	'
Amortized Cost	6,197	30,250
Estimated Fair Value	6,197	30,250
Short-term investments [Member]	'	'
Schedule Of Available For Sale Securities [Line Items]	'	'
Amortized Cost	60,346	63,121
Unrealized Gains	61	160
Unrealized Losses	-55	-25
Estimated Fair Value	60,352	63,256
Short-term investments [Member] | U.S. Government and agency obligations [Member]	'	'
Schedule Of Available For Sale Securities [Line Items]	'	'
Amortized Cost	38,686	41,991
Unrealized Gains	45	84
Unrealized Losses	-30	-21
Estimated Fair Value	38,701	42,054
Short-term investments [Member] | U.S. and foreign corporate debt securities [Member]	'	'
Schedule Of Available For Sale Securities [Line Items]	'	'
Amortized Cost	19,659	18,366
Unrealized Gains	16	76
Unrealized Losses	-21	-1
Estimated Fair Value	19,654	18,441
Short-term investments [Member] | Foreign governments and multi-national agency obligations [Member]	'	'
Schedule Of Available For Sale Securities [Line Items]	'	'
Amortized Cost	2,001	2,764
Unrealized Losses	-4	-3
Estimated Fair Value	$1,997	$2,761

Financial_Instruments_Contract

Financial Instruments - (Contractual Maturities of Cash Equivalents and Short-Term Investments) (Detail) (USD $)	Sep. 30, 2014	Dec. 31, 2013
In Thousands, unless otherwise specified
Financial Instruments [Abstract]	'	'
Due within one year, Amortized Cost Basis	$21,981	$44,477
Due after 1 year through 3 years, Amortized Cost Basis	44,562	48,894
Total cash equivalents & short-term investments, Amortized Cost Basis	66,543	93,371
Due within one year, Aggregate Fair Value	21,996	44,474
Due after 1 year through 3 years, Aggregate Fair Value	44,553	49,032
Total cash equivalents & short-term investments, Aggregate Fair Value	$66,549	$93,506

Financial_Instruments_Fair_Val

Financial Instruments - (Fair Value of Financial Assets Recorded on Recurring Basis) (Detail) (Fair value on a recurring basis [Member], USD $)	Sep. 30, 2014	Dec. 31, 2013
In Thousands, unless otherwise specified
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]	'	'
Fair value of financial assets	$66,549	$93,506
Cash equivalents [Member]	'	'
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]	'	'
Fair value of financial assets	6,197	30,250
Cash equivalents [Member] | Money market mutual funds [Member]	'	'
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]	'	'
Fair value of financial assets	6,197	30,250
Short-term investments [Member]	'	'
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]	'	'
Fair value of financial assets	60,352	63,256
Short-term investments [Member] | U.S. Government and agency obligations [Member]	'	'
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]	'	'
Fair value of financial assets	38,701	42,054
Short-term investments [Member] | U.S. and foreign corporate debt securities [Member]	'	'
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]	'	'
Fair value of financial assets	19,654	18,441
Short-term investments [Member] | Foreign governments and multi-national agency obligations [Member]	'	'
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]	'	'
Fair value of financial assets	1,997	2,761
Quoted Prices in Active Markets for Identical Instruments (Level 1) [Member]	'	'
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]	'	'
Fair value of financial assets	6,197	30,250
Quoted Prices in Active Markets for Identical Instruments (Level 1) [Member] | Cash equivalents [Member]	'	'
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]	'	'
Fair value of financial assets	6,197	30,250
Quoted Prices in Active Markets for Identical Instruments (Level 1) [Member] | Cash equivalents [Member] | Money market mutual funds [Member]	'	'
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]	'	'
Fair value of financial assets	6,197	30,250
Significant Other Observable Inputs (Level 2) [Member]	'	'
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]	'	'
Fair value of financial assets	60,352	63,256
Significant Other Observable Inputs (Level 2) [Member] | Short-term investments [Member]	'	'
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]	'	'
Fair value of financial assets	60,352	63,256
Significant Other Observable Inputs (Level 2) [Member] | Short-term investments [Member] | U.S. Government and agency obligations [Member]	'	'
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]	'	'
Fair value of financial assets	38,701	42,054
Significant Other Observable Inputs (Level 2) [Member] | Short-term investments [Member] | U.S. and foreign corporate debt securities [Member]	'	'
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]	'	'
Fair value of financial assets	19,654	18,441
Significant Other Observable Inputs (Level 2) [Member] | Short-term investments [Member] | Foreign governments and multi-national agency obligations [Member]	'	'
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]	'	'
Fair value of financial assets	$1,997	$2,761

Financial_Instruments_Schedule

Financial Instruments - (Schedule of Gross Unrealized Losses and Fair Values of Investments) (Detail) (USD $)	Sep. 30, 2014	Dec. 31, 2013
In Thousands, unless otherwise specified
Schedule of Available-for-sale Securities [Line Items]	'	'
Fair Value Total (Less Than 12 Months)	$29,974	$19,574
Unrealized Loss Total (Less Than 12 Months)	-55	-25
U.S. and foreign corporate debt securities [Member]	'	'
Schedule of Available-for-sale Securities [Line Items]	'	'
Fair Value Total (Less Than 12 Months)	9,124	4,247
Unrealized Loss Total (Less Than 12 Months)	-21	-1
Foreign governments and multi-national agency obligations [Member]	'	'
Schedule of Available-for-sale Securities [Line Items]	'	'
Fair Value Total (Less Than 12 Months)	1,996	2,761
Unrealized Loss Total (Less Than 12 Months)	-4	-3
U.S. Government and agency obligations [Member]	'	'
Schedule of Available-for-sale Securities [Line Items]	'	'
Fair Value Total (Less Than 12 Months)	18,854	12,566
Unrealized Loss Total (Less Than 12 Months)	($30)	($21)

Commitments_and_Contingencies_1

Commitments and Contingencies - (Narrative) (Detail)	Sep. 30, 2014	Jun. 30, 2014	Sep. 30, 2014	Sep. 30, 2014	Dec. 31, 2013	Sep. 30, 2014	Sep. 30, 2014	Dec. 31, 2013	Dec. 31, 2013
In Millions, unless otherwise specified	USD ($)	EON Patent Litigation [Member]	EON Patent Litigation [Member]	Standby letters of credit [Member]	Standby letters of credit [Member]	Standby letters of credit [Member]	Standby letters of credit [Member]	Standby letters of credit [Member]	Standby letters of credit [Member]
		USD ($)	USD ($)	USD ($)	USD ($)	Australian dollars [Member]	Australian dollars [Member]	Australian dollars [Member]	Australian dollars [Member]
						USD ($)	AUD	USD ($)	AUD
Loss Contingencies [Line Items]	'	'	'	'	'	'	'	'	'
Littigation settlement, amount	'	$18.80	'	'	'	'	'	'	'
Littigation settlement, range of possible loss, minimum	'	13	'	'	'	'	'	'	'
Littigation settlement, range of possible loss, maximum	'	18.8	'	'	'	'	'	'	'
Possible estimated loss	'	'	13	'	'	'	'	'	'
Credit facility with financial institution	50	'	'	3.2	9.8	0.6	0.6	0.6	0.6
Unsecured surety bond	$15	'	'	'	'	'	'	'	'

Commitments_and_Contingencies_2

Commitments and Contingencies - (Future Minimum Commitments Under Operating And Capital Leases) (Detail) (USD $)	Sep. 30, 2014
In Thousands, unless otherwise specified
Commitments and Contingencies [Abstract]	'
Operating leases, 2014	$1,359
Operating leases, 2015	5,401
Operating leases, 2016	4,198
Operating leases, 2017	455
Operating leases, 2018	466
Operating leases, 2019 and thereafter	1,290
Net minimum operating lease payments	13,169
Capital leases, 2014	430
Capital leases, 2015	1,162
Capital leases, 2016	112
Net minimum capital lease payments	1,704
Less amount representing interest	-76
Present value of net minimum capital lease payments	$1,628

StockBased_Compensation_Narrat

Stock-Based Compensation - (Narrative) (Detail) (USD $)

9 Months Ended

9 Months Ended

9 Months Ended

9 Months Ended

In Millions, except Share data, unless otherwise specified

Sep. 30, 2014

Sep. 30, 2013

Dec. 31, 2013

Sep. 30, 2013

Mar. 12, 2013

Sep. 30, 2013

Mar. 12, 2013

Sep. 30, 2014

Sep. 30, 2014

Sep. 30, 2014

Sep. 30, 2014

Sep. 30, 2014

Sep. 30, 2014

2012 Equity Incentive Plan [Member]

2012 Equity Incentive Plan [Member]

ESPP [Member]

ESPP [Member]

Expected compensation expense [Member]

Stock options [Member]

Restricted stock units [Member]

Minimum [Member]

Minimum [Member]

Maximum [Member]

2012 Equity Incentive Plan [Member]

Stock options [Member]

Restricted stock units [Member]

Restricted stock units [Member]

Share-based Compensation Arrangement by Share-based Payment Award [Line Items]

'

'

'

'

'

'

'

'

'

'

'

'

'

Common stock shares reserved for issuance

3,600,000

'

2,500,000

'

3,400,000

'

400,000

'

'

'

'

'

'

Percent of voting power

'

'

'

'

'

'

'

'

10.00%

'

'

'

'

Expected life in years

'10 years

'

'

'

'

'

'

'

'5 years

'

'

'

'

Vesting period

'

'

'

'

'

'

'

'

'4 years

'

'

'2 years

'4 years

Incremental stock-based compensation expense

$5.50

$4.10

'

'

'

'

'

$0.30

'

'

'

'

'

Common stock shares purchased

'

'

'

1,752,895

'

'

'

'

'

'

'

'

'

Common stock exercise price per share

'

'

'

$34.90

'

'

'

'

'

'

'

'

'

Maximum employees contribution

'

'

'

'

'

'

15.00%

'

'

'

'

'

'

Purchase price of common stock

'The purchase price of the stock is the lower of 85% of the fair market value on (a) the first day of the offering period or (b) the purchase date.

'

'

'

'

'

'

'

'

'

'

'

'

Purchase price of the stock as a percent of price of common stock

'

'

'

'

'

85.00%

'

'

'

'

110.00%

'

'

Common stock price per share

'

'

'

$17

'

'

'

'

'

'

'

'

'

Unrecognized compensation costs

'

'

'

'

'

'

'

'

$10.20

$24.50

'

'

'

Weighted-average period of recognized stock-based compensation expenses

'

'

'

'

'

'

'

'8 months 12 days

'3 years

'2 years

'

'

'

StockBased_Compensation_StockB

Stock-Based Compensation - (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
Employee Service Share-based Compensation, Allocation of Recognized Period Costs [Line Items]	'	'	'	'
Stock-based compensation expense	$10,476	$6,990	$31,470	$44,503
Cost of revenue [Member]	'	'	'	'
Employee Service Share-based Compensation, Allocation of Recognized Period Costs [Line Items]	'	'	'	'
Stock-based compensation expense	2,770	1,376	7,392	10,631
Research and development [Member]	'	'	'	'
Employee Service Share-based Compensation, Allocation of Recognized Period Costs [Line Items]	'	'	'	'
Stock-based compensation expense	3,042	1,905	8,892	15,056
Sales and marketing [Member]	'	'	'	'
Employee Service Share-based Compensation, Allocation of Recognized Period Costs [Line Items]	'	'	'	'
Stock-based compensation expense	1,783	950	5,582	5,822
General and administrative [Member]	'	'	'	'
Employee Service Share-based Compensation, Allocation of Recognized Period Costs [Line Items]	'	'	'	'
Stock-based compensation expense	$2,881	$2,759	$9,604	$12,994

StockBased_Compensation_Summar

Stock-Based Compensation - (Summary of Stock Option Activity) (Detail) (USD $)	9 Months Ended
In Thousands, except Per Share data, unless otherwise specified	Sep. 30, 2014
Stock-Based Compensation [Abstract]	'
Beginning balance	4,726
Number of Shares, Options granted	732
Number of Shares, Options exercised	-284
Number of Shares, Options cancelled or expired	-316
Ending balance	4,858
Number of Shares, Options vested and expected to vest	4,770
Number of Shares, Options exercisable	3,515
Weighted Average Exercise Price Per Share, Beginning balance	$11.88
Weighted Average Exercise Price Per Share, Options granted	$14.67
Weighted Average Exercise Price Per Share, Options exercised	$3.31
Weighted Average Exercise Price Per Share, Options cancelled or expired	$17.83
Weighted Average Exercise Price Per Share, Ending balance	$12.41
Weighted Average Exercise Price Per Share, Options vested and expected to vest	$12.34
Weighted Average Exercise Price Per Share, Options exercisable	$10.86
Weighted Average Remaining Contractual Term, Ending balance	'5 years 9 months 22 days
Weighted Average Remaining Contractual Term, Options vested and expected to vest	'5 years 8 months 27 days
Weighted Average Remaining Contractual Term, Options exercisable	'4 years 7 months 17 days
Aggregate Intrinsic Value, Ending balance	$11,176
Aggregate Intrinsic Value, Options vested and expected to vest	11,176
Aggregate Intrinsic Value, Option exercisable	$11,176

StockBased_Compensation_Summar1

Stock-Based Compensation - (Summary of Restricted Stock Unit Activity) (Detail) (Restricted stock units [Member], USD $)	9 Months Ended
In Thousands, except Per Share data, unless otherwise specified	Sep. 30, 2014
Restricted stock units [Member]	'
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]	'
Beginning balance, Number of Shares	2,759
Restricted stock units granted, Number of Shares	1,085
Restricted stock units vested, Number of Shares	-912
Restricted stock units cancelled, Number of Shares	-375
Ending balance, Number of Shares	2,557
Beginning balance, Weighted Average Grant Date Fair Value per Share	$19.14
Restricted stock units granted, Weighted Average Grant Date Fair Value per Share	$13.18
Restricted stock units vested, Weighted Average Grant Date Fair Value per Share	$17.46
Restricted stock units cancelled, Weighted Average Grant Date Fair Value per Share	$17.94
Ending balance, Weighted Average Grant Date Fair Value per Share	$17.36

Income_Taxes_Detail

Income Taxes - (Detail)	3 Months Ended		9 Months Ended
	Sep. 30, 2014	Sep. 30, 2013	Sep. 30, 2014	Sep. 30, 2013
Income Taxes [Abstract]	'	'	'	'
U.S. federal statutory tax rate	0.40%	-0.80%	-0.50%	-0.70%

Business_Acquisition_Narrative

Business Acquisition (Narrative) (Details) (USD $)	1 Months Ended
	23-May-14	Sep. 30, 2014	Dec. 31, 2013	23-May-14	6-May-14
				StreetLight Vision [Member]	StreetLight Vision [Member]
Business Acquisition [Line Items]	'	'	'	'	'
Purchase agreements percent of shares acquired	'	'	'	'	100.00%
Business acquisition cash price	'	'	'	'	$8,800,000
Escrow deposit	'	'	'	2,600,000	'
Escrow deposit threshold	'	'	'	1,300,000	'
Escrow deposit threshold period	'12 months	'	'	'	'
Escrow deposit conclusion period	'24 months	'	'	'	'
Remaining payment	1,300,000	'	'	'	'
Goodwill	'	5,131,000	447,000	'	4,700,000
Identifiable intangible assets	'	'	'	'	4,300,000
Net liabilities	'	'	'	'	($200,000)

Restructuring_Charges_Narrativ

Restructuring Charges (Narrative) (Details) (USD $)	3 Months Ended		9 Months Ended
	Sep. 30, 2014	Sep. 30, 2013	Sep. 30, 2014		Sep. 30, 2013
Restructuring Cost and Reserve [Line Items]	'	'	'		'
Restructuring and other	$2,005,000	'	$1,905,000		'
Stock-based compensation expense	10,476,000	6,990,000	31,470,000		44,503,000
Employee Severance [Member]	'	'	'		'
Restructuring Cost and Reserve [Line Items]	'	'	'		'
Restructuring and other	1,888,000	'	1,888,000		'
Employee Severance [Member] | 2014 Restructuring Plan [Member]	'	'	'		'
Restructuring Cost and Reserve [Line Items]	'	'	'		'
Restructuring and other	'	'	1,888,000	[1]	'
Other Restructuring [Member]	'	'	'		'
Restructuring Cost and Reserve [Line Items]	'	'	'		'
Restructuring and other	117,000	'	17,000		'
Minimum [Member] | 2014 Restructuring Plan [Member]	'	'	'		'
Restructuring Cost and Reserve [Line Items]	'	'	'		'
Future charges	'	'	1,600,000		'
Maximum [Member] | 2014 Restructuring Plan [Member]	'	'	'		'
Restructuring Cost and Reserve [Line Items]	'	'	'		'
Future charges	'	'	$2,100,000		'
[1]	The reserve is recorded in the Condensed Consolidated Balance Sheets under "Accrued liabilities."

Restructuring_Charges_Restruct

Restructuring Charges (Restructuring And Other Charges) (Details) (USD $)	3 Months Ended		9 Months Ended
In Thousands, unless otherwise specified	Sep. 30, 2014	Sep. 30, 2013	Sep. 30, 2014	Sep. 30, 2013
Restructuring Cost and Reserve [Line Items]	'	'	'	'
Restructuring and other	$2,005	'	$1,905	'
Employee Severance [Member]	'	'	'	'
Restructuring Cost and Reserve [Line Items]	'	'	'	'
Restructuring and other	1,888	'	1,888	'
Other Restructuring [Member]	'	'	'	'
Restructuring Cost and Reserve [Line Items]	'	'	'	'
Restructuring and other	$117	'	$17	'

Restructuring_Charges_Restruct1

Restructuring Charges (Restructuring Reserve Activity) (Details) (USD $)	3 Months Ended			9 Months Ended
In Thousands, unless otherwise specified	Sep. 30, 2014		Sep. 30, 2013	Sep. 30, 2014		Sep. 30, 2013
Restructuring Cost and Reserve [Line Items]	'		'	'		'
Additions	$2,005		'	$1,905		'
Employee Severance [Member]	'		'	'		'
Restructuring Cost and Reserve [Line Items]	'		'	'		'
Additions	1,888		'	1,888		'
Employee Severance [Member] | 2014 Restructuring Plan [Member]	'		'	'		'
Restructuring Cost and Reserve [Line Items]	'		'	'		'
Additions	'		'	1,888	[1]	'
Utilization	'		'	-1,026	[1]	'
Ending Balance	$862	[1]	'	$862	[1]	'
[1]	The reserve is recorded in the Condensed Consolidated Balance Sheets under "Accrued liabilities."