Meru Networks (MERU) Inactive 10-K27 Feb 152014 FY Annual reportFinancial data

Company Profile

Document_and_Entity_Informatio

Document and Entity Information (USD $)	12 Months Ended
Document and Entity Information (USD $)	Dec. 31, 2014	Feb. 17, 2015	Jun. 30, 2014
Document And Entity Information [Abstract]
Document Type	10-K
Amendment Flag	FALSE
Document Period End Date	31-Dec-14
Document Fiscal Year Focus	2014
Document Fiscal Period Focus	FY
Trading Symbol	MERU
Entity Registrant Name	MERU NETWORKS INC
Entity Central Index Key	1167294
Current Fiscal Year End Date	-19
Entity Well-known Seasoned Issuer	No
Entity Current Reporting Status	Yes
Entity Voluntary Filers	No
Entity Filer Category	Accelerated Filer
Entity Common Stock, Shares Outstanding		24,258,800
Entity Public Float			$80,874,000

Consolidated_Balance_Sheets

Consolidated Balance Sheets (USD $)	Dec. 31, 2014	Dec. 31, 2013
In Thousands, unless otherwise specified	Dec. 31, 2014	Dec. 31, 2013
CURRENT ASSETS:
Cash and cash equivalents	$14,881	$30,938
Accounts receivable, net of allowance for doubtful accounts of $140 and $28 as of December 31, 2014 and 2013	11,891	17,088
Inventory	8,982	7,230
Prepaid expenses and other current assets	1,502	998
Total current assets	37,256	56,254
Property and equipment, net	1,879	2,451
Goodwill	1,658	1,658
Intangible assets, net		140
Other assets	1,937	1,934
TOTAL ASSETS	42,730	62,437
CURRENT LIABILITIES:
Accounts payable	7,902	6,139
Accrued liabilities	10,223	12,535
Long-term debt, current portion	2,803	3,718
Deferred revenue, current portion	12,781	13,730
Total current liabilities	33,709	36,122
Long-term debt, net of current portion		2,797
Deferred revenue, net of current portion	6,886	5,876
Other liabilities	38	1,387
Total liabilities	40,633	46,182
Commitments and contingencies (Note 12)
STOCKHOLDERS' EQUITY:
Preferred stock, $0.0005 par value - 5,000,000 authorized as of December 31, 2014 and December 31, 2013; no shares issued and outstanding as of December 31, 2014 and December 31, 2013
Common stock, $0.0005 par value - 150,000,000 shares authorized as of December 31, 2014 and December 31, 2013; 24,100,160 and 22,939,949 shares issued and outstanding as of December 31, 2014 and December 31, 2013	12	11
Additional paid-in capital	289,023	282,168
Accumulated other comprehensive loss	-688	-553
Accumulated deficit	-286,250	-265,371
Total stockholders' equity	2,097	16,255
TOTAL LIABILITIES AND STOCKHOLDERS' EQUITY	$42,730	$62,437

Consolidated_Balance_Sheets_Pa

Consolidated Balance Sheets (Parenthetical) (USD $)	Dec. 31, 2014	Dec. 31, 2013
In Thousands, except Share data, unless otherwise specified	Dec. 31, 2014	Dec. 31, 2013
Statement of Financial Position [Abstract]
Accounts receivable, allowance for doubtful accounts	$140	$28
Preferred stock, par value	$0.00	$0.00
Preferred stock, shares authorized	5,000,000	5,000,000
Preferred stock, shares issued	0	0
Preferred stock, shares outstanding	0	0
Common stock, par value	$0.00	$0.00
Common stock, shares authorized	150,000,000	150,000,000
Common stock, shares issued	24,100,160	22,939,949
Common stock, shares outstanding	24,100,160	22,939,949

Consolidated_Statements_of_Ope

Consolidated Statements of Operations (USD $)	12 Months Ended
In Thousands, except Share data, unless otherwise specified	Dec. 31, 2014		Dec. 31, 2013		Dec. 31, 2012
REVENUES:
Products	$71,950		$87,179		$80,770
Support and services	18,941		18,476		16,561
Ratable products and services			92		179
Total revenues	90,891		105,747		97,510
COSTS OF REVENUES:
Products	27,629		30,260		28,879
Support and services	7,472		7,148		6,463
Ratable products and services			47		103
Total costs of revenues	35,101	[1]	37,455	[1]	35,445	[1]
Gross margin	55,790		68,292		62,065
OPERATING EXPENSES:
Research and development	19,844	[1]	15,719	[1]	15,053	[1]
Sales and marketing	43,336	[1]	49,628	[1]	58,759	[1]
General and administrative	11,688	[1]	12,856	[1]	14,844	[1]
Litigation reserve					2,350
Total operating expenses	74,868		78,203		91,006
Loss from operations	-19,078		-9,911		-28,941
Interest expense, net	-1,242		-2,010		-1,656
Other income (expense), net	-40		-2		58
Loss before provision for income taxes	-20,360		-11,923		-30,539
Provision for income taxes	519		443		549
Net loss	($20,879)		($12,366)		($31,088)
Net loss per share of common stock:
Basic and diluted	($0.89)		($0.57)		($1.73)
Shares used in computing net loss per share of common stock:
Basic and diluted	23,525,868		21,800,236		17,968,034

[1]	Includes stock-based compensation expense

Consolidated_Statements_of_Ope1

Consolidated Statements of Operations (Parenthetical) (USD $)	12 Months Ended
In Thousands, unless otherwise specified	Dec. 31, 2014	Dec. 31, 2013	Dec. 31, 2012
Stock-based compensation expense	$1,300	$1,600	$3,500
Costs of Revenues [Member]
Stock-based compensation expense	353	301	320
Research and Development [Member]
Stock-based compensation expense	929	839	1,126
Sales and Marketing [Member]
Stock-based compensation expense	2,081	2,309	2,714
General and Administrative [Member]
Stock-based compensation expense	$2,384	$3,097	$3,389

Consolidated_Statements_of_Com

Consolidated Statements of Comprehensive Loss (USD $)	12 Months Ended
In Thousands, unless otherwise specified	Dec. 31, 2014	Dec. 31, 2013	Dec. 31, 2012
Statement of Comprehensive Income [Abstract]
Net loss	($20,879)	($12,366)	($31,088)
Other comprehensive loss, net of tax:
Foreign currency translation adjustment	-135	-255	-101
Other comprehensive loss, net of tax	-135	-255	-101
Comprehensive loss	($21,014)	($12,621)	($31,189)

Consolidated_Statements_of_Sto

Consolidated Statements of Stockholders' Equity (USD $)	Total	Common Stock [Member]	Additional Paid-in Capital [Member]	Accumulated Other Comprehensive Loss [Member]	Accumulated Deficit [Member]
In Thousands, except Share data, unless otherwise specified	Total	Common Stock [Member]	Additional Paid-in Capital [Member]	Accumulated Other Comprehensive Loss [Member]	Accumulated Deficit [Member]
Beginning balance at Dec. 31, 2011	$32,471	$9	$254,576	($197)	($221,917)
Beginning balance, shares at Dec. 31, 2011		17,674,552
Issuance of common stock warrants	384		384
Issuance of common stock under the employee stock purchase plan	566		566
Issuance of common stock under the employee stock purchase plan, shares		356,388
Issuance of common stock upon exercise of vested stock options and vesting of restricted stock, net of shares withheld for employee taxes	-188		-188
Issuance of common stock upon exercise of vested stock options and vesting of restricted stock, net of shares withheld for employee taxes, shares		433,028
Stock-based compensation	7,549		7,549
Net loss	-31,088				-31,088
Other comprehensive loss:
Foreign currency translation adjustment	-101			-101
Ending balance at Dec. 31, 2012	9,593	9	262,887	-298	-253,005
Ending balance, shares at Dec. 31, 2012		18,463,968
Issuance of common stock, net of offering costs of $1,226	12,574	2	12,572
Issuance of common stock, net of offering costs of $1,226, shares		3,450,000
Issuance of common stock under the employee stock purchase plan	786		786
Issuance of common stock under the employee stock purchase plan, shares		397,080
Issuance of common stock upon exercise of vested stock options and vesting of restricted stock, net of shares withheld for employee taxes	-13		-13
Issuance of common stock upon exercise of vested stock options and vesting of restricted stock, net of shares withheld for employee taxes, shares		628,901
Stock-based compensation	5,936		5,936
Net loss	-12,366				-12,366
Other comprehensive loss:
Foreign currency translation adjustment	-255			-255
Ending balance at Dec. 31, 2013	16,255	11	282,168	-553	-265,371
Ending balance, shares at Dec. 31, 2013		22,939,949
Issuance of common stock under the employee stock purchase plan	971		971
Issuance of common stock under the employee stock purchase plan, shares		344,350
Issuance of common stock upon exercise of vested stock options and vesting of restricted stock, net of shares withheld for employee taxes	-474	1	-475
Issuance of common stock upon exercise of vested stock options and vesting of restricted stock, net of shares withheld for employee taxes, shares		815,861
Stock-based compensation	6,359		6,359
Net loss	-20,879				-20,879
Other comprehensive loss:
Foreign currency translation adjustment	-135			-135
Ending balance at Dec. 31, 2014	$2,097	$12	$289,023	($688)	($286,250)
Ending balance, shares at Dec. 31, 2014		24,100,160

Consolidated_Statements_of_Sto1

Consolidated Statements of Stockholders' Equity (Parenthetical) (USD $)	12 Months Ended
In Thousands, unless otherwise specified	Dec. 31, 2013
Statement of Stockholders' Equity [Abstract]
Offering costs	$1,226

Consolidated_Statements_of_Cas

Consolidated Statements of Cash Flows (USD $)	12 Months Ended
In Thousands, unless otherwise specified	Dec. 31, 2014	Dec. 31, 2013	Dec. 31, 2012
CASH FLOWS FROM OPERATING ACTIVITIES:
Net loss	($20,879)	($12,366)	($31,088)
Adjustments to reconcile net loss to net cash used in operating activities:
Depreciation and amortization	1,553	1,551	1,211
Stock-based compensation	5,747	6,546	7,549
Accrued interest on long-term debt	555	839	631
Amortization of debt issuance costs	128	226	169
Loss on disposal of fixed assets	51
Net provision for (recovery of) bad debt	146	22	-10
Changes in operating assets and liabilities:
Accounts receivable, net	5,050	-2,089	-1,991
Inventory	-1,753	1,622	-2,304
Prepaid expenses and other assets	-532	-128	220
Accounts payable	1,758	3,112	-2,706
Accrued liabilities and other liabilities	-3,573	-995	903
Deferred revenue	61	1,315	2,045
Net cash used in operating activities	-11,688	-345	-25,371
CASH FLOWS FROM INVESTING ACTIVITIES:
Purchase of property and equipment	-909	-1,403	-1,942
Proceeds from maturities of short-term investments			5,000
Net cash paid in purchase of business			-300
Net cash (used in) provided by investing activities	-909	-1,403	2,758
CASH FLOWS FROM FINANCING ACTIVITIES:
Proceeds from the issuance of common stock, net of offering costs		12,574
Proceeds from long-term debt, net of issuance costs			11,489
Proceeds from employee stock purchase plan	971	786	566
Proceeds from exercise of stock options	497	255	74
Taxes paid related to net share settlement of equity awards	-971	-268	-262
Repayment of long-term debt	-3,840	-3,407	-1,578
Net cash (used in) provided by financing activities	-3,343	9,940	10,289
Effect of exchange rate changes on cash and cash equivalents	-117	-109	-80
NET (DECREASE) INCREASE IN CASH AND CASH EQUIVALENTS	-16,057	8,083	-12,404
CASH AND CASH EQUIVALENTS - Beginning of year	30,938	22,855	35,259
CASH AND CASH EQUIVALENTS - End of year	14,881	30,938	22,855
SUPPLEMENTAL DISCLOSURES OF CASH FLOW INFORMATION:
Cash paid for interest	626	1,045	659
Cash paid for income taxes	438	610	319
NONCASH INVESTING AND FINANCING ACTIVITIES:
Issuance of common stock warrants in connection with debt financing			$384

Business_and_Summary_of_Signif

Business and Summary of Significant Accounting Policies	12 Months Ended
Business and Summary of Significant Accounting Policies	Dec. 31, 2014
Accounting Policies [Abstract]
Business and Summary of Significant Accounting Policies	1. Business and Summary of Significant Accounting Policies
	Business — Meru Networks, Inc. (“Meru”) was incorporated in Delaware in January 2002. Meru and its wholly owned subsidiaries (collectively, the “Company”) develop and market a virtualized Wireless Local Area Network (“WLAN”) solution. The Company’s solution is built around its System Director Operating System which runs on its controllers and access points. The Company offers additional products designed to deliver network management, diagnostics and security. The Company also offers support services related to its products, professional services, and training. Products and services are sold through value added resellers, and distributors, as well as the Company’s sales force.
	Basis of Presentation — These consolidated financial statements have been prepared in accordance with accounting principles generally accepted in the United States (“GAAP”) and include the accounts of Meru and its wholly owned subsidiaries. The Company has wholly owned subsidiaries in India, Japan, Netherlands, Canada, Singapore, United Kingdom, Hong Kong, Germany and Sweden. These subsidiaries, except for the Netherland’s subsidiary, use their local currency as their functional currency. All intercompany transactions and balances have been eliminated. Certain reclassifications have been made to prior period amounts to conform to the current period presentation.
	Use of Estimates — The preparation of consolidated financial statements in conformity with GAAP requires management to make estimates and assumptions that affect the reported amounts of assets and liabilities at the date of the consolidated financial statements and the reported amounts of revenues and expenses during the reporting period. Such management estimates include litigation and settlement costs, other loss contingencies, sales returns and allowances, allowance for doubtful accounts, inventory valuation, reserve for warranty costs, valuation of deferred tax assets, stock-based compensation expense and fair value of warrants. The Company bases its estimates on historical experience and also on assumptions that it believes are reasonable. The Company assesses these estimates on a regular basis; however, actual results could materially differ from those estimates.
	Certain Significant Risks and Uncertainties — The Company is subject to certain risks and uncertainties that could have a material and adverse effect on the Company’s future financial position or results of operations. Many of these risks and uncertainties are described in “Risk Factors” in Part I, Item 1A of this Annual Report, which risks and uncertainties include, among others: the Company may experience fluctuations in its revenues and operating results, which makes it difficult to predict future results and which may cause its stock price to decline; the Company has a limited operating history; the Company could continue to incur operating losses throughout 2014; fluctuations in operating results could cause the price of the Company’s common stock to decline; the Company may be unable to raise additional funds or to do so on favorable terms; the Company competes in highly competitive markets and is subject to various competitive pressures; the Company may be unable to compete in a rapidly evolving market and to respond quickly and effectively to changing market requirements; the Company must hire, integrate and retain qualified personnel; the Company’s investments may not generate anticipated revenues; the Company’s products may contain defects or errors; the Company’s failure to provide high-quality support and services could have a material and adverse effect on its business and results of operations; the Company may be unable to increase market awareness of its brand and products and develop and expand its sales channels; the Company’s international operations subject the Company to additional risks; the Company’s failure to maintain effective systems of internal controls could affect the Company’s ability to produce accurate financial results; others may claim that the Company infringes their intellectual property rights; the Company may be unable to protect its intellectual property rights; the continued development of demand for wireless networks is uncertain; the Company’s sales cycle is long and unpredictable and subject to seasonal fluctuation; the Company’s revenues may decline as a result in changes in public funds of educational institutions; the Company may be unable to forecast customer demand accurately in making purchase decisions; average sales prices for the Company’s products may decline; gross margins for the Company’s products and services may vary; the Company relies on channel partners to generate a substantial majority of its revenues and these partners may fail to perform; the Company relies on third parties to manufacture its products and fulfill customer orders and the failure of these third parties to perform could have an adverse effect on the Company’s reputation and ability to manufacture and distribute products; and, the Company may be required comply with new or modified regulations or standards related to its products.
	Concentration of Supply Risk — The Company relies on third parties to manufacture its products, and depends on them for the supply and quality of its products. Quality or performance failures of the Company’s products or changes in its manufacturers’ financial or business condition could disrupt the Company’s ability to supply quality products to its customers and thereby have a material and adverse effect on its business and operating results. Some of the components and technologies used in the Company’s products are purchased and licensed from a single source or a limited number of sources. The loss of any of these suppliers may cause the Company to incur additional transition costs, result in delays in the manufacturing and delivery of its products, or cause it to carry excess or obsolete inventory and could cause it to redesign its products. The Company relies on third parties for the fulfillment of its customer orders, and the failure of these third parties to perform could have an adverse effect upon the Company’s reputation and its ability to distribute its products, which could adversely affect the Company’s business.
	Concentration of Credit Risk — Financial instruments that subject the Company to concentrations of credit risk consist primarily of cash, cash equivalents and accounts receivable. The Company maintains its cash and cash equivalents in fixed-income securities with financial institutions and invests in only high-quality credit instruments. Deposits held with banks may exceed the amount of insurance provided on such deposits.
	Credit risk with respect to accounts receivable in general is diversified due to the number of different entities comprising the Company’s customer base and their location throughout the world. The Company performs ongoing credit evaluations of its customers and generally does not require collateral on accounts receivable. The Company maintains reserves for estimated potential credit losses. As of December 31, 2014, three distributor customers accounted for 39% of the Company’s net accounts receivable. As of December 31, 2013, two distributor customers accounted for 53% of the Company’s net accounts receivable. As of December 31, 2014 and 2013, the allowance for doubtful accounts was $140,000 and $28,000, respectively.
	No end customer accounted for more than 10% of the Company’s net revenues in the years ended December 31, 2014, 2013 or 2012.The Company relies on its channel partners for end customer information. The Company’s channel partners representing greater than 10% of net revenues for the periods presented were as follows (in percentages):


			Years Ended December 31,
	Major Channel Partners		2014			2013			2012
	Westcon Group, Inc.			26	%		26	%		25	%
	Siracom, Inc.			15			14			19
	Scansource Catalyst, Inc.			11			14			13
	Ingram Micro, Inc.			*			18			11

	*	Less than 10%
	Cash Equivalents — The Company considers all highly liquid investments with a maturity of three months or less when purchased to be cash equivalents. Cash and cash equivalents may consist of cash on hand, balances with banks, and highly liquid investments in money market funds, commercial paper, government securities, certificates of deposit and corporate debt securities.

	Foreign Currency — The Company’s non-U.S. subsidiaries in India, Japan, Canada, Singapore, United Kingdom, Hong Kong, Germany and Sweden use the local currency as their functional currency. The assets and liabilities of the non-U.S. subsidiaries are, therefore, translated into U.S. dollars at exchange rates in effect at the balance sheet date, with the resulting translation adjustments recorded to a separate component of accumulated other comprehensive loss within stockholders’ equity. Income and expense accounts are translated at average exchange rates during the year. Transaction gains and losses were not material during the years ended December 31, 2014, 2013 and 2012.
	Inventory — Inventory is stated at the lower of cost or market value. Inventory is determined to be salable based on a demand forecast within a specific time horizon, generally eighteen months or less. Inventory in excess of salable amounts and inventory which is considered obsolete based upon changes in existing technology is written off. At the point of loss recognition, a new lower cost basis for that inventory is established and subsequent changes in facts and circumstances do not result in the restoration or increase in that new cost basis.
	Channel Inventory — Products shipped to certain distributors are considered channel inventory until acceptance provisions are met and return rights lapse. The Company includes channel inventory within inventory on the consolidated balance sheets.
	Advertising Costs — The Company expenses advertising costs as incurred. The Company incurred advertising costs of $53,000, $71,000 and $0.7 million during the years ended December 31, 2014, 2013 and 2012, which is included within sales and marketing expense on the consolidated statements of operations.
	Property and Equipment — Property and equipment, including leasehold improvements, is stated at cost less accumulated depreciation and amortization. Depreciation is computed using the straight-line method over the estimated useful lives of the assets, which is generally three to five years. Internal test units are transferred from inventory at the stated cost and are amortized over the estimated service life of one year from the date of transfer. Leasehold improvements are amortized over the shorter of the estimated useful life of the improvements or the lease term.
	Revenue Recognition — The Company’s revenues are derived primarily from hardware and software products and related support and services. The Company often enters into multiple deliverable arrangements and, as such, the elements of these arrangements are separated and valued based on their relative fair value. The majority of the Company’s products are networking communications hardware with embedded software components such that the software functions together with the hardware to provide the essential functionality of the product. Therefore, the Company’s hardware deliverables are considered to be non-software elements and are excluded from the scope of industry-specific software revenue recognition guidance. The Company’s products revenues also include revenues from the sale of stand-alone software products. Stand-alone software products may operate on the Company’s networking communications hardware, but are not considered essential to the functionality of the hardware. Sales of stand-alone software generally include a perpetual license to the Company’s software. Sales of stand-alone software continue to be subject to the industry-specific software revenue recognition guidance. Product support typically includes software updates on a when and if available basis, telephone and internet access to the Company’s technical support personnel and hardware support. Software updates provide customers with rights to unspecified software product upgrades and to maintenance releases and patches released during the term of the support period.
	Certain arrangements with multiple deliverables have stand-alone software elements that are subject to the existing software revenue recognition guidance along with non-software elements that are subject to the amended revenue accounting guidance. The revenue for these multiple deliverable arrangements is allocated to the stand-alone software elements as a group and to the non-software elements based on the relative selling prices of all of the elements in the arrangement using the fair value hierarchy in the amended revenue accounting guidance.

	For sales of stand-alone software, the Company uses the residual method to recognize revenue when an agreement includes one or more elements to be delivered at a future date and vendor specific objective evidence (“VSOE”) of all undelivered elements exists. The Company establishes VSOE for these arrangements based on sales of support services arrangements on a stand-alone basis. The normal pricing for multi-year support services arrangements is based on the normal price of a one year support services arrangement multiplied by the number of years of support services which is then adjusted for the time value of money and the decreased sales and fulfillment effort for support service periods of longer than one year. In the majority of the Company’s contracts, the only element that remains undelivered at the time of delivery of the software product is support services. Under the residual method, the fair value of the undelivered elements is deferred and the remaining portion of the contract fee is recognized as product revenues. If evidence of the fair value of one or more undelivered elements does not exist, all revenue is generally deferred and recognized when delivery of those elements occurs or when fair value can be established. When the undelivered element for which the Company does not have VSOE is support, revenue for the entire arrangement is bundled and recognized ratably over the support period.
	VSOE for elements of an arrangement is based upon the normal pricing and discounting practices for those services when sold separately. In determining VSOE, the Company requires that a substantial majority of the selling prices for an element falls within a reasonably narrow pricing range, generally evidenced by a substantial majority of such historical stand-alone transactions falling within a reasonably narrow range of the median rates.
	Third-party evidence (“TPE”) of selling price is determined based on competitor prices for similar deliverables when sold separately. However, the Company is typically not able to determine TPE for its products or services. Generally, the Company’s go-to-market strategy differs from that of its peers and the Company’s offerings contain a significant level of differentiation such that the comparable pricing of products with similar functionality cannot be obtained. Furthermore, the Company is unable to reliably determine the selling prices for similar products from competitors on a stand-alone basis. The Company establishes estimated selling prices (“ESP”) for support services based on its normal pricing and discounting practices for support services. This ESP analysis requires that a substantial majority of the support services selling prices fall within a reasonably narrow pricing range, which is typically broader than the range used to evidence VSOE. The Company believes that this is the price at which it would sell support services if support services were regularly sold on a stand-alone basis.
	When the Company is unable to establish the selling price of its non-software elements using VSOE or TPE, the Company uses ESP in its allocation of arrangement consideration. The objective of ESP is the estimated price at which the Company would transact a sale if the product or service were sold on a stand-alone basis. The Company determines ESP for a product or service by considering multiple factors including, but not limited to, pricing policies, internal costs, gross margin objectives and discount from the list prices.
	The Company regularly reviews VSOE and ESP and maintains internal controls over the establishment and updates of these estimates. There was no material impact during 2014, nor does the Company currently expect a material impact in the near term, from changes in VSOE or ESP.
	The Company recognizes revenues when all of the following have occurred: (1) the Company has entered into a legally binding arrangement with a customer; (2) delivery has occurred; (3) customer payment is deemed fixed or determinable and free of contingencies and significant uncertainties; and (4) collection is probable. The sales prices for the Company’s products are typically considered to be fixed or determinable at the inception of an arrangement. Delivery is considered to have occurred when product title has transferred to the customer, when the service or training has been provided, when software is delivered, or when the support period has lapsed. To the extent that agreements contain rights of return or acceptance provisions, revenues are deferred until the acceptance provisions or rights of return lapse.

	The majority of the Company’s sales are generated through its distributors. Revenues from distributors with return rights are recognized when the distributor reports that the product has been sold through, provided that all other revenue recognition criteria have been met. The Company obtains sell-through information from these distributors. For transactions with other distributors, the Company does not provide for rights of return and recognizes products revenues at the time of shipment, assuming all other revenue recognition criteria have been met. Sales to certain distributors were made pursuant to price discounts based on certain criteria, the Company accrues the estimated price discount as a reduction to both accounts receivable and net revenues.
	Revenues for support services are recognized on a straight-line basis over the support period, which typically ranges from one year to five years.
	Shipping charges billed to customers are included in products revenues and the related shipping costs are included in costs of products revenues.
	Impairment of Long-Lived Assets — The Company evaluates its long-lived assets for indicators of possible impairment when events or changes in circumstances indicate the carrying amount of an asset may not be recoverable. Impairment exists if the carrying amounts of such assets exceed the estimates of future net undiscounted cash flows expected to be generated by such assets. Should impairment exist, the impairment loss would be measured based on the excess carrying value of the asset over the asset’s estimated fair value. The Company has not incurred any impairment expense related to its long-lived assets during the years ended December 31, 2014, 2013 or 2012.
	Goodwill — Goodwill represents the excess of the purchase price over the fair value of the net tangible and identifiable intangible assets acquired in a business combination. The Company reviews goodwill for impairment on an annual basis or whenever events or changes in circumstances indicate the carrying value may not be recoverable. The Company first assesses qualitative factors to determine whether it is more likely than not that the fair value of a reporting unit is less than its carrying amount as a basis for determining whether it is necessary to perform the two-step quantitative goodwill impairment test. If, after assessing the totality of circumstances, an entity determines that it is more likely than not that the fair value of a reporting unit is less than its carrying amount, then it is required to perform the two-step impairment test. It does not require an entity to calculate the fair value of a reporting unit unless the entity determines that it is more likely than not that its fair value is less than its carrying value. However, an entity also has the option to bypass the qualitative assessment for any reporting unit in any period and proceed directly to performing the first step of the two-step goodwill impairment test. The Company has determined that it has a single reporting unit for purposes of performing its goodwill impairment test. As the Company uses the market approach to assess impairment, its common stock price is an important component of the fair value calculation. If the Company’s stock price continues to experience significant price and volume fluctuations, this will impact the fair value of the reporting unit and can lead to potential impairment in future periods. The Company performed its annual impairment test in June 2014 and determined that its goodwill was not impaired. As of December 31, 2014, the Company had not identified any factors that indicated there was an impairment of its goodwill and determined that no additional impairment analysis was then required.
	Fair Value of Financial Instruments — Due to their short-term nature, the carrying amounts of the Company’s financial instruments reported in the consolidated financial statements, which include cash, cash equivalents, accounts receivable, accounts payable and accrued liabilities approximate fair value. Based on borrowing rates currently available to the Company for loans with similar terms, the carrying value of the long-term debt approximates fair value.

	Income Taxes — As part of the process of preparing the Company’s consolidated financial statements, the Company is required to estimate its taxes in each of the jurisdictions in which it operates. The Company estimates actual current tax exposure together with assessing temporary differences resulting from differing treatment of items, such as accruals and allowances not currently deductible for tax purposes. These differences result in deferred tax assets and liabilities, which are included in the Company’s consolidated balance sheets. In general, deferred tax assets represent future tax benefits to be received when certain expenses previously recognized in the Company’s consolidated statements of operations become deductible expenses under applicable income tax laws or loss or credit carryforwards are utilized. Accordingly, realization of the Company’s deferred tax assets is dependent on future taxable income against which these deductions, losses, and credits can be utilized.
	The Company must assess the likelihood that the Company’s deferred tax assets will be recovered from future taxable income, and to the extent the Company believes that recovery is not likely, the Company establishes a valuation allowance. Management judgment is required in determining the Company’s provision for income taxes, deferred tax assets and liabilities, and any valuation allowance recorded against the net deferred tax assets. The Company recorded a full valuation allowance as of December 31, 2014, 2013 and 2012. Based on the available evidence, the Company believes it is more likely than not that it will not be able to utilize its deferred tax assets in the future. The Company intends to maintain valuation allowances until sufficient evidence exists to support the reversal of such valuation allowances. The Company makes estimates and judgments about its future taxable income that are based on assumptions that are consistent with its plans. Should the actual amounts differ from the Company’s estimates, the carrying value of the Company’s deferred tax assets could be materially impacted.
	The Company recognizes in the financial statements the impact of a tax position, if that position is more likely than not of being sustained on audit, based on the technical merits of the position. The Company’s policy is to recognize interest and penalties accrued on any unrecognized tax benefits as a component of income tax expense. The Company does not believe there are any tax positions for which it is reasonably possible that the total amounts of unrecognized tax benefits will significantly increase or decrease within 12 months of the reporting date.
	Stock-Based Compensation — Compensation costs related to employee stock awards that were either granted or modified during the years ended December 31, 2014, 2013 and 2012 are based on the fair value of the awards on the date of grant or modification, net of estimated forfeitures. The Company calculates the fair value of its restricted stock based on the fair market value on the date of grant. The Company determines the grant date fair value of its options and shares under its employee stock purchase plan using the Black-Scholes option-pricing model. The Company recognizes stock-based compensation expense on a straight-line basis over the vesting period of the respective option grants.
	Research and Development Costs — Research and development costs are expensed as incurred.
	Software Development Costs — The costs to develop software have not been capitalized as the Company believes its current software development process is essentially completed concurrent with the establishment of technological feasibility.
	Accounts Receivable — Trade accounts receivable are recorded at the invoiced amount, net of allowances for doubtful accounts. The allowance for doubtful accounts is based on the Company’s assessment of the collectibility of customer accounts. The Company regularly reviews the allowance by considering certain factors such as historical experience, credit quality, age of the accounts receivable balances, and current economic conditions that may affect a customer’s ability to pay. During the years ended December 31, 2014, 2013 and 2012, the Company recorded bad debt expense of $148,000, $30,000 and $44,000. The Company collected previously written-off bad debt expense of $2,000, $8,000 and $54,000 during the years ended December 31, 2014, 2013 and 2012. Write-offs of previously reserved bad debts were approximately $34,000, $8,000 and $110,000 during the years ended December 31, 2014, 2013 and 2012.
	Comprehensive Loss — Comprehensive loss is comprised of net loss and other comprehensive loss. For the Company, other comprehensive loss includes foreign currency translation adjustments. Total comprehensive loss for all periods presented has been disclosed in the consolidated statements of comprehensive loss.
	Warranty — The Company provides a warranty on products and estimated warranty costs are recorded during the period of sale. The Company establishes warranty reserves based on estimates of product warranty return rates and expected costs to repair or to replace the products under warranty. The Company’s accrual for anticipated warranty costs has declined primarily due to a decline in the historical volume of product returned under the warranty program. The warranty provision is recorded as a component of costs of products revenues in the condensed consolidated statements of operations.
	Accrued warranty, which is included in accrued liabilities on the consolidated balance sheets, is summarized for the years ended December 31, 2014, 2013 and 2012 as follows (in thousands):


			Years Ended December 31,
			2014			2013			2012
	Accrued warranty balance — beginning of period		$	1,345		$	870		$	662
	Warranty costs incurred			(104	)		(101	)		(182	)
	Provision for warranty for the period			218			576			390
	Adjustment to pre-existing warranties			(866	)		—			—

	Accrued warranty balance — end of period		$	593		$	1,345		$	870

Loss Contingencies — The Company is or has been subject to proceedings, lawsuits and other claims arising in the ordinary course of business. The Company evaluates contingent liabilities, including threatened or pending litigation, for potential losses. If the potential loss from any claim or legal proceedings is considered probable and the amount can be estimated, the Company accrues a liability for the estimated loss. Because of uncertainties related to these matters, accruals are based upon the best information available. For potential losses for which there is a reasonable possibility (meaning the likelihood is more than remote but less than probable) that a loss exists, the Company will disclose an estimate of the potential loss or range of such potential loss or include a statement that an estimate of the potential loss cannot be made. As additional information becomes available, the Company reassesses the potential liability related to pending claims and litigation and may revise its estimates, which could materially impact its consolidated financial statements.

Recently_Issued_Accounting_Pro

Recently Issued Accounting Pronouncements	12 Months Ended
Recently Issued Accounting Pronouncements	Dec. 31, 2014
Accounting Changes and Error Corrections [Abstract]
Recently Issued Accounting Pronouncements	2. Recently Issued Accounting Pronouncements
	In May 2014, the Financial Accounting Standards Board (“FASB”) issued their guidance on revenue from contracts with customers. The guidance outlines a single comprehensive model for entities to use in accounting for revenue arising from contracts with customers and supersedes most current revenue recognition guidance, including industry-specific guidance. The guidance also requires enhanced disclosures regarding the nature, amount, timing and uncertainty of revenue and cash flows arising from an entity’s contracts with customers. The guidance is effective for public entities for reporting periods beginning after December 15, 2016, and interim and annual reporting periods thereafter. Early adoption is not permitted for public entities. The Company is currently evaluating the impact of the amended guidance on its consolidated financial position, results of operations and cash flows.

	In June 2014, the FASB issued their guidance on accounting for share-based payments when the terms of an award provide that a performance target could be achieved after the requisite service period. The guidance requires that a performance target that affects vesting and that could be achieved after the requisite service period be treated as a performance condition. The guidance is effective for annual reporting periods, and interim periods within those years, beginning after December 15, 2015. Early adoption is permitted. The amendments may be applied prospectively to all awards granted or modified after the effective date or retrospectively to all awards with performance targets that are outstanding as of the beginning of the earliest annual period presented. The Company is currently evaluating the impact of the amended guidance on its consolidated financial statements.

Inventory

Inventory	12 Months Ended
Inventory	Dec. 31, 2014
Inventory Disclosure [Abstract]
Inventory	3. Inventory
	Inventory as of December 31, 2014 and 2013 is as follows (in thousands):


		December 31,		December 31,
		2014		2013
	Finished goods	$	8,521	$	6,692
	Channel inventory		461		538

	Inventory	$	8,982	$	7,230

Net_Loss_Per_Share_of_Common_S

Net Loss Per Share of Common Stock

12 Months Ended

Dec. 31, 2014

Earnings Per Share [Abstract]

Net Loss Per Share of Common Stock

4. Net Loss Per Share of Common Stock

The Company’s basic net loss per share of common stock is calculated by dividing the net loss attributable to common stockholders by the weighted-average number of shares of common stock outstanding for the period. The weighted-average number of shares of common stock used to calculate the Company’s basic net loss per share of common stock excludes stock awards prior to vesting and also those shares subject to repurchase related to stock options that were exercised prior to vesting as these shares are not deemed to be issued for accounting purposes until they vest. The diluted net loss per share of common stock is calculated by giving effect to all potential common stock equivalents outstanding for the period determined using the treasury-stock method. For purposes of the diluted shares outstanding calculation, restricted stock units, stock options to purchase common stock, common stock subject to repurchase, and warrants to purchase common stock are considered to be common stock equivalents. In periods in which the Company has reported a net loss, the common stock equivalents have been excluded from the calculation of diluted net loss per share of common stock as their effect is antidilutive under the treasury stock method.

The following outstanding shares of common stock and common stock equivalents were excluded from the computation of diluted net loss per share of common stock for the periods presented because including them would have been antidilutive:

Years Ended December 31,

2014

2013

2012

Stock awards and stock options to purchase common stock*

4,626,504

4,628,668

4,498,964

Common stock warrants

468,293

3,192,250

Includes 289,515, 195,370 and 171,070 shares, which were expected to be issued pursuant to the Company’s Employee Stock Purchase Plan as of December 31, 2014, 2013 and 2012, respectively, based on employee enrollment.

Cost_Reduction_Program

Cost Reduction Program	12 Months Ended
Cost Reduction Program	Dec. 31, 2014
Restructuring and Related Activities [Abstract]
Cost Reduction Program	5. Cost Reduction Program
	In January 2014, the Company commenced a realignment of its resources in accordance with the evolving demands of the business. While the Company continued to invest in research and development in an effort to enhance existing products as well as develop new products, it consolidated certain functions which resulted in a restructuring cost of $0.7 million for the year 2014. As part of the plan, the Company eliminated approximately 18 positions worldwide in its research and development, sales and marketing and general and administrative functions. The restructuring costs consist primarily of severance expenses. The affected employees departed by June 30, 2014. The Company recorded the restructuring expenses in the consolidated statements of operations as follows (in thousands):


		Year Ended
		December 31, 2014
	Research and development	$	43
	Sales and marketing		419
	General and administrative		223

	Total restructuring expenses	$	685

	The following table provides a summary of the restructuring activities included in accrued liabilities during the year 2014 (in thousands):


		Severance			Other Exit-			Total
		Severance			Related Costs			Total
	Balance at January 1, 2014	$	—		$	—		$	—
	Restructuring expenses		655			30			685
	Cash payments		(490	)		(13	)		(503	)
	Stock-based compensation		(147	)		—			(147	)

	Balance at December 31, 2014	$	18		$	17		$	35

	The restructuring costs include $147,000 of stock-based compensation expense resulting from the acceleration of vesting of 59,000 restricted stock units to two affected employees. The Company recorded a recovery of $50,000 due to adjustments to reduce accrued severance expenses during the year 2014.
	The balance at December 31, 2014 represents remaining estimated costs for activities that have been incurred, but have yet to be paid, as a result of the restructuring. Payments for the remaining $35,000 are expected to be paid by March 31, 2015.

Fair_Value_of_Financial_Instru

Fair Value of Financial Instruments

12 Months Ended

Dec. 31, 2014

Fair Value Disclosures [Abstract]

Fair Value of Financial Instruments

6. Fair Value of Financial Instruments

As a basis for determining the fair value of certain of the Company’s assets and liabilities, the Company established a three-tier value hierarchy which prioritizes the inputs used in measuring fair value as follows: (Level I) observable inputs such as quoted prices in active markets; (Level II) inputs other than the quoted prices in active markets that are observable either directly or indirectly; and (Level III) unobservable inputs in which there is little or no market data and that require the Company to develop its own assumptions. This hierarchy requires the Company to use observable market data, when available, and to minimize the use of unobservable inputs when determining fair value. The Company’s financial assets that are measured at fair value on a recurring basis consist of cash equivalents. The Company did not have any financial liabilities that are measured at fair value on a recurring basis as of December 31, 2014 and 2013.

Level I instrument valuations are obtained from quotes for transactions in active exchange markets involving identical assets. The Company’s cash equivalents are valued using market prices on active markets (Level I). Pricing is provided by third party sources of market information obtained through the Company’s investment advisors rather than models. The Company does not adjust for or apply any additional assumptions or estimates to the pricing information it receives from its advisors. The Company considers this the most reliable information available for the valuation of the securities. The Company had no transfers between Level I and Level II during the years ended December 31, 2014 and 2013.

As of December 31, 2014, the Company’s fair value hierarchy for its financial assets was as follows (in thousands):

December 31, 2014

Quoted Prices in Active

Significant Other

Significant

Total

Markets for Identical

Observable

Unobservable

Instruments

(Level I)

(Level II)

(Level III)

Fair Value

Assets:

Money market funds

9,085

—

9,085

As of December 31, 2013, the Company’s fair value hierarchy for its financial assets was as follows (in thousands):

December 31, 2013

Quoted Prices in Active

Significant Other

Significant

Total

Markets for Identical

Observable

Unobservable

Instruments

(Level I)

(Level II)

(Level III)

Fair Value

Assets:

Money market funds

15,084

—

15,084

Goodwill_and_Intangible_Assets

Goodwill and Intangible Assets	12 Months Ended
Goodwill and Intangible Assets	Dec. 31, 2014
Goodwill and Intangible Assets Disclosure [Abstract]
Goodwill and Intangible Assets	7. Goodwill and Intangible Assets
	On August 31, 2011, the Company acquired all of the outstanding shares of Identity Networks (“Identity”), a privately-owned provider of complete guest and device access management solutions located in the United Kingdom. The Company recorded $1.7 million goodwill as a consequence of that acquisition. Intangible assets acquired are accounted for based on the fair value of assets purchased and are amortized over the period in which economic benefit is estimated to be received.
	As of December 31, 2014, identifiable intangible assets were as follows (in thousands):


		As of December 31, 2014
		Estimated		Gross		Accumulated			Net
		Useful Life		Value		Amortization			Value
	Developed technology		3 years	$	630	$	(630	)	$	—

	Total			$	630	$	(630	)	$	—


	As of December 31, 2013, identifiable intangible assets were as follows (in thousands):


		As of December 31, 2013
		Estimated		Gross		Accumulated			Net
		Useful Life		Value		Amortization			Value
	Developed technology		3 years	$	630	$	(490	)	$	140
	Customer relationships		2 years		160		(160	)		—

	Total			$	790	$	(650	)	$	140

	The Company recorded amortization expense related to these identified intangible assets in the consolidated statements of operations as follows (in thousands):


		Years Ended December 31,
		2014		2013		2012
	Costs of products revenues	$	140	$	210	$	210
	Sales and marketing		—		53		80

	Total amortization expense	$	140	$	263	$	290

	As of December 31, 2014, the identifiable intangible assets were fully amortized.

Cost_Method_Investments

Cost Method Investments	12 Months Ended
Cost Method Investments	Dec. 31, 2014
Investments, Debt and Equity Securities [Abstract]
Cost Method Investments	8. Cost Method Investments
	During the year ended December 31, 2011, the Company invested $1.3 million in a company which is developing value-added applications that are designed to allow its customers to achieve greater benefit from wireless networks such as those offered by the Company. The investment of $1.3 million is included in other assets in the consolidated balance sheets as of December 31, 2014 and 2013. The investee was co-founded by Dr. Vaduvur Bharghavan, a co-founder of the Company who served as a member of the Company’s board of directors until May 2012.
	Equity investments, especially equity investments in private companies, are inherently risky. Many factors, including technical and product development challenges, market acceptance, competition, additional funding availability and the overall economy, could cause the investment to be impaired. The Company monitors the indicators of impairment of its investments. In the event that the fair value of an investment is below its carrying value and the impairment is other-than-temporary, the Company writes down the investment to its fair value. There were no indicators of impairment during the years ended December 30, 2014, 2013 and 2012. The Company has not elected to use the fair value method for this investment.

Property_and_Equipment_Net

Property and Equipment, Net	12 Months Ended
Property and Equipment, Net	Dec. 31, 2014
Property, Plant and Equipment [Abstract]
Property and Equipment, Net	9. Property and Equipment, net
	Property and equipment, net as of December 31, 2014 and 2013 is as follows (in thousands):


		December 31,			December 31,
		2014			2013
	Computer equipment	$	2,642		$	2,361
	Computer software		2,029			1,807
	Machine and equipment		2,154			1,882
	Furniture and fixtures		132			134
	Leasehold improvements		1,409			1,434

	Property and equipment, gross		8,366			7,618
	Less accumulated depreciation and amortization		(6,487	)		(5,167	)

	Property and equipment, net	$	1,879		$	2,451

	Depreciation and amortization expense for property and equipment was $1.4 million, $1.3 million and $0.9 million during the years ended December 31, 2014, 2013 and 2012.

Accrued_Liabilities

Accrued Liabilities	12 Months Ended
Accrued Liabilities	Dec. 31, 2014
Payables and Accruals [Abstract]
Accrued Liabilities	10. Accrued Liabilities
	Accrued liabilities as of December 31, 2014 and 2013 consist of the following (in thousands):


		December 31,		December 31,
		2014		2013
	Accrued compensation and benefits	$	2,167	$	4,422
	Accrual for loan maturity payment		1,832		—
	Accrued commissions		1,204		2,008
	Accrued inventory		951		522
	Reserve for product warranty		593		1,345
	Income tax payable		531		525
	Sales returns reserve		329		319
	Marketing		327		645
	Accrued employee stock purchase plan		179		214
	Accrued professional service fees		130		229
	Other		1,980		2,306

		$	10,223	$	12,535

Borrowings

Borrowings	12 Months Ended
Borrowings	Dec. 31, 2014
Debt Disclosure [Abstract]
Borrowings	11. Borrowings
	In June 2012, the Company entered into a loan and security agreement (the “VLL Agreement”), with Venture Lending and Leasing VI, Inc. (“VLL”), pursuant to which VLL made a term loan to the Company in the aggregate principal amount of $12 million. The Company received proceeds of $11.7 million, less issuance costs paid of $162,000. The VLL Agreement is collateralized by substantially all assets and intellectual property of the Company and contains various covenants that include limitations, among others, on the Company’s ability to incur additional indebtedness; its ability to acquire, merge or consolidate with other businesses; and its ability to pay dividends on its equity securities. As of December 31, 2014 and 2013, the Company was in compliance with all of its loan covenants.

	The VLL Agreement bears interest at an annual fixed rate of 12%, and is payable in 39 equal installments, including principal and interest, of $369,405 per month. In addition, the Company is required to make a payment of $2.0 million on the earlier of a change of control or September 1, 2015, which is the maturity date of the VLL Agreement. The Company recorded $0.5 million and $0.8 million as additional interest expense during the years ended December 31, 2014 and 2013, respectively, related to the $2.0 million payment. The Company will continue to accrue the balance of the $2.0 million cash payment over the remaining term of the loan using the effective interest rate method, unless a change of control occurs, at which time the full amount will become due and payable.
	The Company may voluntarily prepay all but not less than the total outstanding principal balance plus interest at any time, provided the Company is not then in default, subject to prepayment penalties. On or after January 1, 2014, if prepaid, a prepayment penalty in the amount of 80% of the remaining scheduled but unpaid interest through the maturity date will become due.
	In connection with the VLL Agreement, the Company issued Venture Lending & Leasing, LLC a warrant to purchase 468,293 shares of the Company’s common stock. The warrant was exercisable upon issuance, has an exercise price of $2.05 per share, and expires on June 1, 2017. Upon issuance, the relative fair value of the warrant was recorded as a debt discount on the consolidated balance sheets in the amount of $384,000. In addition, debt issuance costs of $162,000 were also recorded as a debt discount. The aggregate total of the debt discounts of $546,000 is being amortized to interest expense over the repayment period for the loan using the effective interest rate method. The Company recorded $128,000 and $226,000 to interest expense, net related to the debt discounts during the years ended December 31, 2014 and 2013, respectively. As of December 31, 2014, the remaining unamortized amount of the debt discounts was $24,000, which was classified as a current debt discount.
	The remaining principal payments for the Company’s long-term debt as of December 31, 2014 was $2.8 million.

Commitments_and_Contingencies

Commitments and Contingencies	12 Months Ended
Commitments and Contingencies	Dec. 31, 2014
Commitments and Contingencies Disclosure [Abstract]
Commitments and Contingencies	12. Commitments and Contingencies
	Legal Matters
	On April 13, 2012, the Company entered into a settlement, license and release agreement with Extricom Ltd. (“Extricom”). Pursuant to the agreement with Extricom, the Company and Extricom each agreed to provide one another with perpetual, fully paid up, non-exclusive worldwide licenses to each of our respective patent portfolios as of the settlement date. The Company and Extricom also agreed to release one another of certain claims based on infringement or alleged infringement of certain patent rights; including dismissal of the then-current litigation.
	In evaluating the accounting treatment for this transaction, the Company identified the following specific items the Company received from the Extricom Agreement: (1) release of past infringement claims and (2) a license to Extricom technology. The Company does not believe the Extricom license will provide future value as the Company does not plan to utilize the underlying technology in any future product development. In addition, the Extricom Agreement released and avoided certain litigation for the Company, but provided no other future benefits to the Company. Therefore, the Company expensed the full $2.4 million in the year ended December 31, 2012.
	Litigation — The Company is subject to various claims arising in the ordinary course of business. Although no assurance may be given, the Company believes that it is not presently a party to any litigation of which the outcome, if determined adversely, would individually or in the aggregate be reasonably expected to have a material and adverse effect on the business, operating results, cash flows or financial position of the Company. The Company records litigation accruals for legal matters which are both probable and estimable. For legal proceedings for which there is a reasonable possibility of loss (meaning those losses for which the likelihood is more than remote but less than probable), the Company has determined that it does not have material exposure, or it is unable to develop a range of reasonably possible losses.
	For an additional discussion of certain risks associated with legal proceedings, see the section entitled “Legal Proceedings” in Part I, Item 3 of this Annual Report on Form 10-K.
	Operating Leases — The Company leases approximately 44,000 square feet office space for its headquarters in Sunnyvale, California under a noncancelable operating lease that expires in March 2020. In addition, the Company leases approximately 35,000 square feet space for a research and development facility in Bangalore, India pursuant to an operating lease that expires in 2016, which was noncancelable prior to 2014. The Company has the option to renew the lease for an additional five years. The Company also leases office space for sales offices and test facilities in multiple locations around the world under noncancelable operating leases that expire at various dates. Commitments under these operating leases are as follows (in thousands):


		Operating Leases
	Fiscal Years:
	2015	$	989
	2016		1,204
	2017		1,110
	2018		1,144
	2019		1,178
	Thereafter		297

	Total	$	5,922

	Rent expense related to these noncancelable operating leases was $1.8 million, $1.8 million, and $2.1 million for the years ended December 31, 2014, 2013 and 2012. Rent expense is recognized on a straight-line basis over the term of the lease. Other commitments as of December 31, 2014 totaled approximately $6.9 million and consisted of inventory and other non-cancelable purchase obligations, which are due within the next 12 months.
	Indemnifications — Our customer agreements generally include certain provisions for indemnifying such customers against certain liabilities, including if our products infringe a third party’s intellectual property rights. From time to time, we receive requests for indemnification from our customers. We review these requests on a case-by-case basis and may choose to assume the defense of such litigation asserted against our customers. We have agreed in certain circumstances to indemnify certain suppliers and service providers in connection with liabilities they may incur in connection with the provision of services to us. To date, we have not incurred any material costs as a result of such indemnification provisions and we have not accrued any liabilities related to such obligations in the accompanying consolidated financial statements.
	In addition, our Bylaws provide that we shall indemnify our directors, officers, employees and agents to the extent such person becomes a party or is threatened to become a party to litigation or other proceedings arise by reason of their service to the Company, subject to certain limitations . In addition, we have entered into indemnification agreements or other contractual arrangements with current and former executive officers and directors of the Company which contain provisions that may require us, among other things, to indemnify such officers and directors against certain liabilities that may arise by reason of their status or service as directors or officers and to advance their expenses incurred as a result of any proceeding against them as to which they could be indemnified. The Company also maintains director and officer insurance, which may cover certain liabilities arising from its obligation to indemnify its directors and officers.
	In the event that one or more of these matters were to result in a claim against the Company, an adverse outcome, including a judgment or settlement, may cause a material adverse effect on the Company’s future business, operating results or financial condition. It is not possible to determine the maximum potential amount under these indemnification agreements due to the limited history of prior indemnification claims and the unique facts and circumstances involved in each particular agreement.
	From time to time, the Company may receive indemnification claims in the normal course of business. The Company does not believe it is party to any currently pending claims the outcome of which will have a material adverse effect on its operations or financial position.

Common_Stock

Common Stock	12 Months Ended
	Dec. 31, 2014
Equity [Abstract]
Common Stock	13. Common Stock
	Sale of Common Stock
	On February 27, 2013, the Company entered into an Underwriting Agreement (the “Underwriting Agreement”) with William Blair & Company, L.L.C (the “Underwriter”), pursuant to which the Company agreed to offer and sell 3,000,000 shares of its common stock with a par value of $0.0005 per share, at a price of $4.00 per share (the “Offering”). Under the terms of the Underwriting Agreement, the Company granted the Underwriters a 30-day option to purchase an additional 450,000 shares of the Company’s common stock to cover overallotments, which the Underwriter exercised on March 4, 2013. The Company completed the sale of 3,450,000 shares of its common stock and received $12.6 million in proceeds, net of underwriting discount, commission and other issuance costs, on March 4, 2013, which was the closing date of the Offering.
	Warrants for Common Stock
	The Company issued a warrant to purchase 468,293 shares of the Company’s common stock in connection with the VLL Agreement entered into in June 2012. The warrant was exercisable upon issuance, has an exercise price of $2.05 per share, and expires on June 1, 2017. Upon issuance, the Company determined the fair value using the Black-Scholes option-pricing model with the following assumptions:


		June 2012
	Dividend rate		0	%
	Risk-free interest rate		0.7	%
	Expected life (in years)		5
	Expected volatility		59.1	%
	The relative fair value of the warrant was recorded as a debt discount on the consolidated balance sheet in the amount of $384,000. As of December 31, 2014, this warrant has not been exercised and was still outstanding.
	In 2009, the Company issued warrants to purchase 4,007,432 shares of common stock. During 2010, the Company issued another warrant to purchase 36,582 shares of common stock. These common stock warrants are exercisable, have exercise prices ranging from $9.78 to $11.74 and expire in 2014. During the years ended 2011 and 2010, warrants to purchase 1,265,293 and 54,764 shares were exercised utilizing a cashless exercise provision. As a result, the Company issued 548,125 shares and 19,072 shares of common stock. There have been no exercises since 2011. The remaining warrants to purchase 2,723,957 shares of common stock expired unexercised on March 12, 2014.

Equity_Incentive_Plans

Equity Incentive Plans	12 Months Ended
Equity Incentive Plans	Dec. 31, 2014
Disclosure of Compensation Related Costs, Share-based Payments [Abstract]
Equity Incentive Plans	14. Equity Incentive Plans
	The Company’s equity incentive plans are broad-based retention programs. The plans are intended to attract talented employees, directors and non-employee consultants.
	2013 New Employee Stock Inducement Plan
	On June 6, 2013, the Company’s Board of Directors approved the Company’s 2013 New Employee Stock Inducement Plan (the “2013 Plan”), under which 500,000 shares of common stock were reserved for issuance. The 2013 Plan is designed to attract new employees by providing for awards in the form of restricted stock units, restricted stock awards, stock options (which shall be nonstatutory stock options) or stock appreciation rights. As of December 31, 2014, 315,000 shares of restricted stock units have been issued, of which 105,000 shares of restricted stock units vested during the year ended December 31, 2014. As of December 31, 2014, 185,000 shares of common stock were available for future issuance under the 2013 Plan.
	Inducement Plan and Agreement and Restricted Stock Unit Plan and Agreements with Chief Executive Officer
	In March 2012, the Company granted options to purchase 600,000 shares of common stock under the Inducement Stock Option Plan (the “2012 Plan”) and Agreement, 50,000 shares of restricted stock units under the Service-Based Restricted Stock Unit Plan and Agreement and 50,000 shares of restricted stock units under the Performance-Based Restricted Stock Unit Plan and Agreement, to Dr. Bami Bastani, Chief Executive Officer (“CEO”), as a material inducement to the acceptance of employment with the Company. The grants were approved by the Company’s board of directors, as specified under the Listing Rules of the Nasdaq Stock Market. The 50,000 shares of restricted stock units under the Performance-Based Restricted Stock Unit Plan were cancelled during 2014 while the 50,000 shares of restricted stock units under the Service-Based Restricted Stock Unit Plan and Agreement were fully vested as of December 31, 2014. As of December 31, 2014, options to purchase 600,000 shares of common stock were issued and outstanding under the Inducement Stock Option Plan.
	Stock Incentive Plans
	In March 2010, the Company’s board of directors and its stockholders approved the 2010 Stock Incentive Plan (the “2010 Plan”), effective upon the completion of the Company’s initial public offering (“IPO”) on April 6, 2010. The 2010 Plan provides for the granting of stock options, restricted stock, restricted stock units and stock appreciation rights. The number of shares reserved for issuance under the 2010 Plan is increased on the first day of each of the Company’s fiscal years by the lesser of 4% of the Company’s outstanding common stock on the last day of the immediately preceding fiscal year or the number of shares determined by the Company’s board of directors.
	The Company’s stock-based compensation expense was $5.7 million, $6.5 million and $7.5 million during the years ended December 31, 2014, 2013 and 2012, respectively.
	Determining Fair Value of Stock Options
	The fair value of stock options granted during the years ended December 31, 2014, 2013 and 2012 were determined by the Company using the methods and assumptions discussed below. Each of these inputs is subjective and generally requires significant judgment to determine.
	Valuation Method — The Company estimates the fair value of stock options granted using the Black-Scholes option-pricing model.

	Expected Term — The expected term represents the period that the Company’s stock-based awards are expected to be outstanding. The expected term is derived from historical data on employee exercises and post-vesting employment termination behavior taking into account the contractual life of the award.
	Expected Volatility — The expected volatility was calculated based on the historical stock volatilities of a peer group of publicly listed companies combined with the Company’s historical data over a period equal to the expected terms of the options as the Company did not have a sufficient trading history to use the volatility of its own common stock.
	Risk-Free Interest Rate — The risk-free interest rate is based on the U.S. Treasury yield curve in effect at the time of grant for zero coupon U.S. Treasury notes with maturities approximately equal to the option’s expected term.
	Expected Dividend — The Company has never paid dividends and currently does not expect to pay dividends.
	Forfeiture Rate — The Company estimates its forfeiture rate based on an analysis of its actual forfeitures and will continue to evaluate the adequacy of the forfeiture rate based on actual forfeiture experience, analysis of employee turnover, and other factors. The impact from a forfeiture rate adjustment will be recognized in full in the period of adjustment, and if the actual number of future forfeitures differs from that estimated by the Company, the Company may be required to record adjustments to stock-based compensation expense in future periods.
	Summary of Assumptions — The fair value of each employee stock option was estimated at the date of grant using a Black-Scholes option-pricing model, with the following weighted-average assumptions for grants of options during the years ended December 31, 2014, 2013 and 2012:


			Years Ended
			December 31,
			2014				2013				2012
	Dividend rate			0	%			0	%			0	%
	Risk-free interest rate			1.3	%			0.7	%			0.9	%
	Expected life (in years)			4				4.1				4.9
	Expected volatility			73.6	%			71.5	%			61.8	%
	The weighted-average grant date fair value of the Company’s stock options granted during the years ended December 31, 2014, 2013 and 2012 was $2.30, $1.94 and $2.88 per share. The aggregate grant date fair value of the Company’s stock options granted to employees for the years ended December 31, 2014, 2013 and 2012 was $23,000, $0.7 million and $6.8 million. The Company recognized stock-based compensation expense in the amount of $1.3 million, $1.6 million and $3.5 million for stock options in the years ended December 31, 2014, 2013 and 2012.

	A summary of the Company’s stock award activity for the years ended December 31, 2014, 2013 and 2012 is presented below:


			Shares				Number				Weighted-			Weighted-				Aggregate
			Available				of Stock Options				Average			Average				Intrinsic
			for Grant				Outstanding				Exercise			Remaining				Value
											Price			Contractual				(in thousands)
														Life (Years)
	Outstanding — January 1, 2012			1,312,029				3,140,283			$	9.04
	Additional options authorized			706,982				—				—
	Options granted*			(1,776,682	)			1,776,682				3.09
	Inducement option granted			—				600,000				4.62
	Restricted stock granted			(620,259	)			—				—
	Cancelled options**			1,939,838				(1,939,838	)			9.66
	Restricted stock returned			190,560				—				—
	Exercised options			—				(61,175	)			1.21

	Outstanding — December 31, 2012			1,752,468				3,515,952				5.07
	Additional options authorized			738,559				—				—
	Inducement shares authorized			500,000				—				—
	Options granted			(386,175	)			386,175				3.59
	Inducement restricted stock units granted			(315,000	)			—				—
	Restricted stock granted			(1,449,352	)			—				—
	Cancelled options			996,167				(996,167	)			5.7
	Restricted stock returned			396,136				—				—
	Exercised options			—				(72,382	)			3.53

	Outstanding — December 31, 2013			2,232,803				2,833,578				4.68
	Additional options authorized			917,598				—				—
	Options granted			(10,000	)			10,000				4.15
	Restricted stock granted			(1,632,971	)			—				—
	Cancelled options			350,679				(350,679	)			4.71
	Restricted stock returned			543,039				—				—
	Exercised options			—				(173,322	)			2.85

Outstanding — December 31, 2014			2,401,148				2,319,577			$	4.81			6.8			$	789

Vested and expected to vest — December 31, 2014							2,002,439			$	4.94			6.7			$	678
Vested — December 31, 2014							1,629,875			$	5.27			6.5			$	472

*	Includes options to purchase 692,682 shares of common stock, which were issued pursuant to the Company’s Exchange Offer program.
**	Includes options to purchase 960,443 shares of common stock, which were cancelled pursuant to the Company’s Exchange Offer program.
The aggregate intrinsic value of options exercised under the 2010 Plan was $0.2 million, $0.1 million and $0.1 million for the years ended December 31, 2014, 2013 and 2012, determined as of the date of option exercise.

Additional information regarding the Company’s stock options outstanding and vested as of December 31, 2014 is summarized below:


		Options Outstanding										Options Vested and
		Options Outstanding										Exercisable
						Weighted-Average		Weighted-							Weighted-
						Remaining		Average							Average
						Contractual Life		Exercise							Exercise
Exercise Prices		Shares				(Years)		Price per Share				Shares			Price per Share
$0.91 - $2.17			230,235			7.2		$	1.66				136,600		$	1.64
$2.18 - $4.33			888,673			7.7		$	3.44				530,717		$	3.44
$4.34 - $6.50			835,834			6.9		$	4.83				604,501		$	4.84
$6.51 - $8.67			246,709			4.5		$	7.9				241,331		$	7.92
$8.68 - $19.51			118,126			3.9		$	14.68				116,726		$	14.66

			2,319,577			6.8		$	4.81				1,629,875		$	5.27

As of December 31, 2014, total compensation cost related to unvested stock-based awards granted to employees, but not yet recognized, was $6.8 million, net of estimated forfeitures. This cost will be amortized on a straight-line basis over a weighted-average remaining period of 1.9 years and will be adjusted for subsequent changes in estimated forfeitures. Future option grants will increase the amount of compensation expense that will be recorded.
Exchange Offer — On July 26, 2012, the Company commenced an offer to eligible employees to exchange certain options to purchase shares of the Company’s common stock outstanding on July 26, 2012, which had an exercise price greater than $2.00 per share (the “Eligible Options”), that were granted under the Company’s 2002 Stock Incentive Plan or the 2010 Plan and that do not vest upon the achievement of certain performance criteria for new nonqualified stock options to be granted under the 2010 Plan (the “New Options”) following the expiration of the offer. The Company’s CEO and its non-employee directors were not eligible to participate in the offer. Eligible Options tendered were exchanged for an equal number of New Options, except that certain eligible officers received a lesser number of New Options, depending on the exercise price of the Eligible Options tendered. Options to purchase 960,443 shares of common stock (the “Exchanged Options”) were cancelled and exchanged for options to purchase 692,682 shares of common stock with a new vesting schedule of 25% vest after the first year of service, and ratably monthly over the remaining 36 months contingent upon the employment with the Company on the date of vest. The offer expired on August 22, 2012. The New Options were granted following the expiration of the offer with an exercise price of $3.40 per share, the closing price of the Company’s stock as reported by the Nasdaq Global Market on August 23, 2012. This modification resulted in an incremental charge of $0.5 million being amortized over the 4-year service period of the New Options in addition to the unamortized expense related to the Exchanged Options.
Restricted Stock Awards and Restricted Stock Units — The Company has issued restricted stock awards (“RSAs”) and restricted stock units (“RSUs”) to employees and members of the board of directors. These restricted shares have vesting periods ranging from three months to four years from the date of issuance and vesting is subject to the recipient continuing to provide service to the Company for the duration of the vesting period. In addition, the vesting of some RSUs is performance based and the vesting of those RSUs is subject to the achievement of specific performance metrics in addition to continued service.
During the year ended December 31, 2014, the Company issued 1,632,971 RSUs, which were issued from the 2010 Plan. During the year ended December 31, 2013, the Company issued 1,764,352 RSUs, of which 315,000 RSUs were issued from the 2013 Plan and 1,449,352 RSUs were issued from the 2010 Plan. The Company recognized stock-based compensation in the amount of $4.0 million, $4.4 million, $3.6 million for RSAs and RSUs awarded in the years ended December 31, 2014, 2013 and 2012, respectively.
A summary of the Company’s RSA activity for the years ended December 31, 2014, 2013 and 2012 is presented below:


		Number				Weighted				Aggregate
		of Restricted				Average Grant				Intrinsic
		Stock Awards				Date Fair				Value
		Outstanding				Value				(in thousands)
Outstanding — January 1, 2012			3,600			$	13.73			$	14
Restricted stock awards granted			—				—
Restricted stock awards released			(1,200	)			13.73
Restricted stock awards forfeited			—				—

Outstanding — December 31, 2012			2,400				13.73				6
Restricted stock awards granted			—				—
Restricted stock awards released			(1,200	)			13.73
Restricted stock awards forfeited			(1,200	)			13.73

Outstanding — December 31, 2013			—				—				—
Restricted stock awards granted			—				—
Restricted stock awards released			—				—
Restricted stock awards forfeited			—				—

Outstanding — December 31, 2014			—			$	—			$	—

A summary of the Company’s RSU activity for the years ended December 31, 2014, 2013 and 2012 is presented below:


		Number				Weighted				Aggregate
		of Restricted				Average Grant				Intrinsic
		Stock Units				Date Fair				Value
		Outstanding				Value				(in thousands)
Outstanding — January 1, 2012			645,685			$	12.24			$	2,667
Restricted stock units granted			720,259				3.93
Restricted stock units released			(448,327	)			7.78
Restricted stock units forfeited			(108,075	)			12.26

Outstanding — December 31, 2012			809,542				7.32				2,145
Restricted stock units granted			1,764,352				3.91
Restricted stock units released			(624,896	)			5.68
Restricted stock units forfeited			(349,278	)			6.27

Outstanding — December 31, 2013			1,599,720				4.43				6,895
Restricted stock units granted			1,632,971				4.2
Restricted stock units released			(887,744	)			4.64
Restricted stock units forfeited			(327,535	)			4.2

Outstanding — December 31, 2014			2,017,412			$	4.13			$	7,571

The majority of the RSUs that vested in the years ended December 31, 2014, 2013 and 2012 were net-share settled such that the Company withheld shares with value equivalent to the employees’ minimum statutory obligation for the applicable income and other employment taxes, and remitted the cash to the appropriate taxing authorities. The total shares withheld were based on the value of the RSUs on their vesting date as determined by the Company’s closing stock price. These net-share settlements had the effect of share repurchases by the Company as they reduced and retired the number of shares that would have otherwise been issued as a result of the vesting and did not represent an expense to the Company. For the year ended December 31, 2014, 887,744 shares of restricted stock units vested with an intrinsic value of approximately $3.5 million, and the Company withheld 245,205 shares to satisfy approximately $1.0 million of employees’ minimum tax obligation on the vested restricted stock units. For the year ended December 31, 2013, 624,896 shares of restricted stock units vested with an intrinsic value of approximately $2.3 million, and the Company withheld 69,577 shares to satisfy approximately $0.3 million of employees’ minimum tax obligation on the vested restricted stock units.
Employee Stock Purchase Plan — In March 2010, the Company’s board of directors approved the 2010 Employee Stock Purchase Plan (“ESPP”). The price of the common stock purchased under the ESPP shall be the lower of 85% of the market value of the Company’s common stock at the beginning of the offering period or 85% of the market value of the Company’s common stock on the last trading day of the applicable offering period. On the first day of each of the Company’s fiscal years, beginning on January 1, 2011, additional shares equal to the lesser of 1% of the outstanding shares of the Company on such date or a lesser amount determined by the Company’s board of directors will be reserved for issuance under the ESPP; provided, however, that no annual increase shall be added after March 30, 2020.
The Company calculated the compensation expense for the ESPP using the Black-Scholes option-pricing model with the following weighted-average assumptions during the years ended December 31, 2014, 2013 and 2012:


		Years Ended December 31,
		2014				2013				2012
Dividend rate			0	%			0	%			0	%
Risk-free interest rate			0.1	%			0.1	%			0.2	%
Expected life (in years)			0.8				0.8				0.7
Expected volatility			47.3	%			84.4	%			89.7	%
The Company recognized compensation expense related to the ESPP in the amount of $0.4 million, $0.5 and $0.4 million for the years ended December 31, 2014, 2013 and 2012. The Company issued 344,350 shares of common stock for $1.0 million, 397,080 shares of common stock for $0.8 million and 356,388 shares of common stock for $0.6 million for the years ended December 31, 2014, 2013 and 2012, respectively. The Company had 115,658 shares of its common stock available for future issuance under the ESPP as of December 31, 2014.

Income_Taxes

Income Taxes	12 Months Ended
Income Taxes	Dec. 31, 2014
Income Tax Disclosure [Abstract]
Income Taxes	15. Income Taxes
	The Company’s loss before provision for income taxes for the years ended December 31, 2014, 2013 and 2012 is as follows (in thousands):


			Years ended December 31,
			2014				2013			2012
	Domestic		$	(22,263	)		$	(13,724	)	$	(32,502	)
	International			1,903				1,801			1,963

	Loss before provision for income taxes		$	(20,360	)		$	(11,923	)	$	(30,539	)


	The components of the provision for income taxes for the years ended December 31, 2014, 2013 and 2012 are as follows (in thousands):


			Years ended December 31,
			2014				2013			2012
	Current
	Federal		$	—			$	—		$	—
	State			11				(2	)		25
	Foreign			508				445			524

	Total current			519				443			549

	Deferred
	Federal			—				—			—
	State			—				—			—
	Foreign			—				—			—

	Total deferred			—				—			—

	Total provision for income taxes		$	519			$	443		$	549

	Reconciliations of the statutory federal income tax to the Company’s effective tax for the years ended December 31, 2014, 2013 and 2012 are as follows (in thousands):


			Years ended December 31,
			2014				2013			2012
	Tax at statutory federal rate		$	(6,923	)		$	(4,054	)	$	(10,383	)
	State tax — net of federal benefit			(449	)			(275	)		(1,553	)
	Nondeductible expenses			775				790			1,279
	Foreign income rate differential			(138	)			(635	)		(698	)
	Foreign tax			444				413			486
	Credits			(957	)			(631	)		(347	)
	Change in state apportionment			83				1,774			—
	Other			547				866			(596	)
	Valuation allowance changes affecting the tax provision			7,137				2,195			12,361

	Provision for income taxes		$	519			$	443		$	549

	Net deferred tax assets as of December 31, 2014 and 2013 consist of the following (in thousands):


			December 31,				December 31,
			2014				2013
	Deferred tax assets:
	Depreciation and amortization		$	12,081			$	11,298
	Accruals and other			14,598				14,876
	Research and other credits			6,925				5,968
	Net operating loss carryforward			59,541				53,867

	Gross deferred tax asset			93,145				86,009
	Valuation allowance			(93,145	)			(86,009	)

Net deferred tax assets		$	—			$	—


A valuation allowance is provided when it is more likely than not that the deferred tax assets will not be realized. The Company has established a valuation allowance to offset net deferred tax assets at December 31, 2014 due to the uncertainty of realizing future tax benefits from its net operating loss carryforwards and other deferred tax assets.
The valuation allowance increased by $7.1 million, $2.2 million, and $12.4 million during the years ended December 31, 2014, 2013, and 2012.
At December 31, 2014, the Company has federal and state net operating loss carryforwards of approximately $163.8 million and $119.9 million, respectively, beginning to expire in 2022 and 2015, respectively.
As of December 31, 2014 the Company has federal and state research credit carryovers of approximately $4.5 million and $5.0 million, respectively, expiring beginning in 2022 for federal. California credits will carryforward indefinitely.
As of December 31, 2014, the Company has a foreign tax credit carryover of $1.1 million expiring beginning in 2018.
Internal Revenue Code section 382 places a limitation (the “Section 382 Limitation”) on the amount of taxable income can be offset by net operating (“NOL”) carryforwards after a change in control (generally greater than 50% change in ownership) of a loss corporation. California has similar rules. The Company’s capitalization described herein may have resulted in such a change. Generally, after a control change, a loss corporation cannot deduct NOL carryfowards in excess of the Section 382 Limitation.
The foreign subsidiaries are subject to cost-plus model based on their operating expenses. The Company has funded these subsidiaries since incorporation and the foreign companies have not repatriated any earnings nor does it intend to. The Company has not reflected income taxes that would be payable on unremitted foreign earnings of the controlled foreign corporations because such earnings are intended to be permanently reinvested in those countries.
The Company has made no provision for U.S. income taxes on undistributed earnings of certain foreign subsidiaries because it is the Company’s intention to permanently reinvest such earnings in its foreign subsidiaries. If such earnings were distributed, the Company would be subject to approximately $0.9 million additional U.S. tax expense.
Uncertain Tax Positions
The Company files income tax returns in the U.S. federal jurisdiction and various state and foreign jurisdictions. The Company’s tax years for 2002 and forward are subject to examination by the U.S. tax authorities and various state tax authorities. These years are open due to net operating losses and tax credits unutilized from such years. The Company’s tax years for December 31, 2006 and forward are subject to examination by the major foreign taxing jurisdictions in which the Company is subject to tax.
As of December 31, 2014, the Company had $2.6 million of cumulative unrecognized tax benefits of which $0.2 million has an effect on the Company’s effective tax rate.

A reconciliation of the beginning and ending unrecognized tax benefit amounts since adoption is as follows (in thousands):


Balance at January 1, 2012		$	1,949
Increase related to 2012 tax position			134

Balance at December 31, 2012			2,083
Increase related to 2013 tax position			241

Balance at December 31, 2013			2,324
Increase related to 2014 tax position			296

Balance at December 31, 2014		$	2,620

Employee_Benefit_Plan

Employee Benefit Plan	12 Months Ended
Employee Benefit Plan	Dec. 31, 2014
Compensation and Retirement Disclosure [Abstract]
Employee Benefit Plan	16. Employee Benefit Plan
Employee Benefit Plan	The Company has established a 401(k) tax-deferred savings plan (the “401(k) Plan”) which permits participants to make contributions by salary deduction pursuant to Section 401(k) of the Internal Revenue Code. The Company is responsible for administrative costs of the 401(k) Plan and has made no contributions to the 401(k) Plan since inception.

RelatedParty_Transactions

Related-Party Transactions	12 Months Ended
Related-Party Transactions	Dec. 31, 2014
Related Party Transactions [Abstract]
Related-Party Transactions	17. Related-Party Transactions
Related-Party Transactions	The Company has a reseller in Japan that was a related party by virtue of its ownership of shares of the Company’s stock during fiscal years 2014, 2013 and 2012. However, as of the third quarter of 2014, this reseller is no longer a related party due to the fact that it no longer owns shares of the Company’s stock. The total revenue from this former related party amounted to $0.8 million, $0.6 million and $0.7 million for the years ended December 31, 2014, 2013 and 2012. Accounts receivable from the reseller was $5,000 as of December 31, 2013.

Information_about_Geographic_A

Information about Geographic Areas	12 Months Ended
Information about Geographic Areas	Dec. 31, 2014
Segment Reporting [Abstract]
Information about Geographic Areas	18. Information about Geographic Areas
	The Company considers operating segments to be components of the Company in which separate financial information is available that is evaluated regularly by the Company’s chief operating decision maker, or decision making group, in deciding how to allocate resources and in assessing performance. The chief operating decision maker for the Company is the CEO. The CEO reviews financial information presented on a consolidated basis, accompanied by information about revenue by geographic region, for purposes of allocating resources and evaluating financial performance. The Company has one business activity and there are no segment managers who are held accountable for operations, operating results or plans for levels or components below the consolidated unit level. Accordingly, the Company has determined that it has a single reporting segment and operating unit structure which is the development and marketing of wireless infrastructure solutions.

	Revenues
	Revenues by geography are based on the billing address of the customer. The following table sets forth revenue by geographic area (in thousands):


		Years ended December 31,
		2014		2013		2012
	United States	$	43,975	$	57,961	$	50,443
	United Kingdom		18,539		19,676		21,476
	Rest of EMEA		10,702		11,176		11,077
	Rest of Americas		7,057		7,273		5,373
	Asia Pacific		10,618		9,661		9,141

	Total	$	90,891	$	105,747	$	97,510

	Long-Lived Assets
	The following table sets forth long-lived assets by geographic area (in thousands):


		December 31,		December 31,
		2014		2013
	United States	$	1,144	$	1,390
	India		721		1,055
	United Kingdom		13		—
	Japan		1		6

	Total	$	1,879	$	2,451

Subsequent_Events

Subsequent Events	12 Months Ended
Subsequent Events	Dec. 31, 2014
Subsequent Events [Abstract]
Subsequent Events	19. Subsequent Events
	On January 6, 2015, the Company announced a plan of reorganization (the “Restructuring”) pursuant to which, among other things, employees will be terminated under a plan of termination. The Company currently estimates recording restructuring charges of approximately $1.5 million to $2.0 million in the first quarter of 2015 in connection with the Restructuring relating to one-time employee termination benefits, including severance benefits and other employee termination expenses, and other one-time items. In order to further preserve existing cash, a portion of the severance benefits may be paid with stock in the form of accelerated vesting of outstanding restricted stock units. In connection with the efforts to streamline its business structure with the Restructuring, the Company expects to reduce worldwide headcount by approximately 10%. The majority of these reductions were effective by January 9, 2015.
	The Company further announced that it had retained Deutsche Bank as its exclusive financial advisor to explore strategic options, including, but not limited to, strategic partnering of its technology and possible sale or merger of the Company. There can be no assurance that the Company’s exploration of strategic options will result in a transaction. The Company has not set a timetable for the completion of this process and does not intend to disclose further developments unless and until its Board of Directors approves a specific action or otherwise concludes the review of strategic options.

Schedule_II_Valuation_and_Qual

Schedule II - Valuation and Qualifying Accounts	12 Months Ended
Schedule II - Valuation and Qualifying Accounts	Dec. 31, 2014
Valuation and Qualifying Accounts [Abstract]
Schedule II - Valuation and Qualifying Accounts	SCHEDULE II—VALUATION AND QUALIFYING ACCOUNTS


		Years Ended December 31,
		2014			2013			2012
		(in thousands)
	Allowance for Doubtful Accounts:
	Beginning balance	$	28		$	14		$	134
	Charged to costs and expenses		148			30			44
	Recovery of bad debt		(2	)		(8	)		(54	)
	Bad debt write-offs		(34	)		(8	)		(110	)

	Ending balance	$	140		$	28		$	14

Business_and_Summary_of_Signif1

Business and Summary of Significant Accounting Policies (Policies)

12 Months Ended

Dec. 31, 2014

Accounting Policies [Abstract]

Basis of Presentation

Basis of Presentation — These consolidated financial statements have been prepared in accordance with accounting principles generally accepted in the United States (“GAAP”) and include the accounts of Meru and its wholly owned subsidiaries. The Company has wholly owned subsidiaries in India, Japan, Netherlands, Canada, Singapore, United Kingdom, Hong Kong, Germany and Sweden. These subsidiaries, except for the Netherland’s subsidiary, use their local currency as their functional currency. All intercompany transactions and balances have been eliminated. Certain reclassifications have been made to prior period amounts to conform to the current period presentation.

Use of Estimates

Use of Estimates — The preparation of consolidated financial statements in conformity with GAAP requires management to make estimates and assumptions that affect the reported amounts of assets and liabilities at the date of the consolidated financial statements and the reported amounts of revenues and expenses during the reporting period. Such management estimates include litigation and settlement costs, other loss contingencies, sales returns and allowances, allowance for doubtful accounts, inventory valuation, reserve for warranty costs, valuation of deferred tax assets, stock-based compensation expense and fair value of warrants. The Company bases its estimates on historical experience and also on assumptions that it believes are reasonable. The Company assesses these estimates on a regular basis; however, actual results could materially differ from those estimates.

Certain Significant Risks and Uncertainties

Certain Significant Risks and Uncertainties — The Company is subject to certain risks and uncertainties that could have a material and adverse effect on the Company’s future financial position or results of operations. Many of these risks and uncertainties are described in “Risk Factors” in Part I, Item 1A of this Annual Report, which risks and uncertainties include, among others: the Company may experience fluctuations in its revenues and operating results, which makes it difficult to predict future results and which may cause its stock price to decline; the Company has a limited operating history; the Company could continue to incur operating losses throughout 2014; fluctuations in operating results could cause the price of the Company’s common stock to decline; the Company may be unable to raise additional funds or to do so on favorable terms; the Company competes in highly competitive markets and is subject to various competitive pressures; the Company may be unable to compete in a rapidly evolving market and to respond quickly and effectively to changing market requirements; the Company must hire, integrate and retain qualified personnel; the Company’s investments may not generate anticipated revenues; the Company’s products may contain defects or errors; the Company’s failure to provide high-quality support and services could have a material and adverse effect on its business and results of operations; the Company may be unable to increase market awareness of its brand and products and develop and expand its sales channels; the Company’s international operations subject the Company to additional risks; the Company’s failure to maintain effective systems of internal controls could affect the Company’s ability to produce accurate financial results; others may claim that the Company infringes their intellectual property rights; the Company may be unable to protect its intellectual property rights; the continued development of demand for wireless networks is uncertain; the Company’s sales cycle is long and unpredictable and subject to seasonal fluctuation; the Company’s revenues may decline as a result in changes in public funds of educational institutions; the Company may be unable to forecast customer demand accurately in making purchase decisions; average sales prices for the Company’s products may decline; gross margins for the Company’s products and services may vary; the Company relies on channel partners to generate a substantial majority of its revenues and these partners may fail to perform; the Company relies on third parties to manufacture its products and fulfill customer orders and the failure of these third parties to perform could have an adverse effect on the Company’s reputation and ability to manufacture and distribute products; and, the Company may be required comply with new or modified regulations or standards related to its products.

Concentration of Supply Risk

Concentration of Supply Risk — The Company relies on third parties to manufacture its products, and depends on them for the supply and quality of its products. Quality or performance failures of the Company’s products or changes in its manufacturers’ financial or business condition could disrupt the Company’s ability to supply quality products to its customers and thereby have a material and adverse effect on its business and operating results. Some of the components and technologies used in the Company’s products are purchased and licensed from a single source or a limited number of sources. The loss of any of these suppliers may cause the Company to incur additional transition costs, result in delays in the manufacturing and delivery of its products, or cause it to carry excess or obsolete inventory and could cause it to redesign its products. The Company relies on third parties for the fulfillment of its customer orders, and the failure of these third parties to perform could have an adverse effect upon the Company’s reputation and its ability to distribute its products, which could adversely affect the Company’s business.

Concentration of Credit Risk

Concentration of Credit Risk — Financial instruments that subject the Company to concentrations of credit risk consist primarily of cash, cash equivalents and accounts receivable. The Company maintains its cash and cash equivalents in fixed-income securities with financial institutions and invests in only high-quality credit instruments. Deposits held with banks may exceed the amount of insurance provided on such deposits.

Credit risk with respect to accounts receivable in general is diversified due to the number of different entities comprising the Company’s customer base and their location throughout the world. The Company performs ongoing credit evaluations of its customers and generally does not require collateral on accounts receivable. The Company maintains reserves for estimated potential credit losses. As of December 31, 2014, three distributor customers accounted for 39% of the Company’s net accounts receivable. As of December 31, 2013, two distributor customers accounted for 53% of the Company’s net accounts receivable. As of December 31, 2014 and 2013, the allowance for doubtful accounts was $140,000 and $28,000, respectively.

No end customer accounted for more than 10% of the Company’s net revenues in the years ended December 31, 2014, 2013 or 2012.The Company relies on its channel partners for end customer information. The Company’s channel partners representing greater than 10% of net revenues for the periods presented were as follows (in percentages):

Years Ended December 31,

Major Channel Partners

2014

2013

2012

Westcon Group, Inc.

Siracom, Inc.

Scansource Catalyst, Inc.

Ingram Micro, Inc.

Less than 10%

Cash Equivalents

Cash Equivalents — The Company considers all highly liquid investments with a maturity of three months or less when purchased to be cash equivalents. Cash and cash equivalents may consist of cash on hand, balances with banks, and highly liquid investments in money market funds, commercial paper, government securities, certificates of deposit and corporate debt securities.

Foreign Currency

Foreign Currency — The Company’s non-U.S. subsidiaries in India, Japan, Canada, Singapore, United Kingdom, Hong Kong, Germany and Sweden use the local currency as their functional currency. The assets and liabilities of the non-U.S. subsidiaries are, therefore, translated into U.S. dollars at exchange rates in effect at the balance sheet date, with the resulting translation adjustments recorded to a separate component of accumulated other comprehensive loss within stockholders’ equity. Income and expense accounts are translated at average exchange rates during the year. Transaction gains and losses were not material during the years ended December 31, 2014, 2013 and 2012.

Inventory

Inventory — Inventory is stated at the lower of cost or market value. Inventory is determined to be salable based on a demand forecast within a specific time horizon, generally eighteen months or less. Inventory in excess of salable amounts and inventory which is considered obsolete based upon changes in existing technology is written off. At the point of loss recognition, a new lower cost basis for that inventory is established and subsequent changes in facts and circumstances do not result in the restoration or increase in that new cost basis.

Channel Inventory

Channel Inventory — Products shipped to certain distributors are considered channel inventory until acceptance provisions are met and return rights lapse. The Company includes channel inventory within inventory on the consolidated balance sheets.

Advertising Costs

Advertising Costs — The Company expenses advertising costs as incurred. The Company incurred advertising costs of $53,000, $71,000 and $0.7 million during the years ended December 31, 2014, 2013 and 2012, which is included within sales and marketing expense on the consolidated statements of operations.

Property and Equipment

Property and Equipment — Property and equipment, including leasehold improvements, is stated at cost less accumulated depreciation and amortization. Depreciation is computed using the straight-line method over the estimated useful lives of the assets, which is generally three to five years. Internal test units are transferred from inventory at the stated cost and are amortized over the estimated service life of one year from the date of transfer. Leasehold improvements are amortized over the shorter of the estimated useful life of the improvements or the lease term.

Revenue Recognition

Revenue Recognition — The Company’s revenues are derived primarily from hardware and software products and related support and services. The Company often enters into multiple deliverable arrangements and, as such, the elements of these arrangements are separated and valued based on their relative fair value. The majority of the Company’s products are networking communications hardware with embedded software components such that the software functions together with the hardware to provide the essential functionality of the product. Therefore, the Company’s hardware deliverables are considered to be non-software elements and are excluded from the scope of industry-specific software revenue recognition guidance. The Company’s products revenues also include revenues from the sale of stand-alone software products. Stand-alone software products may operate on the Company’s networking communications hardware, but are not considered essential to the functionality of the hardware. Sales of stand-alone software generally include a perpetual license to the Company’s software. Sales of stand-alone software continue to be subject to the industry-specific software revenue recognition guidance. Product support typically includes software updates on a when and if available basis, telephone and internet access to the Company’s technical support personnel and hardware support. Software updates provide customers with rights to unspecified software product upgrades and to maintenance releases and patches released during the term of the support period.

Certain arrangements with multiple deliverables have stand-alone software elements that are subject to the existing software revenue recognition guidance along with non-software elements that are subject to the amended revenue accounting guidance. The revenue for these multiple deliverable arrangements is allocated to the stand-alone software elements as a group and to the non-software elements based on the relative selling prices of all of the elements in the arrangement using the fair value hierarchy in the amended revenue accounting guidance.

For sales of stand-alone software, the Company uses the residual method to recognize revenue when an agreement includes one or more elements to be delivered at a future date and vendor specific objective evidence (“VSOE”) of all undelivered elements exists. The Company establishes VSOE for these arrangements based on sales of support services arrangements on a stand-alone basis. The normal pricing for multi-year support services arrangements is based on the normal price of a one year support services arrangement multiplied by the number of years of support services which is then adjusted for the time value of money and the decreased sales and fulfillment effort for support service periods of longer than one year. In the majority of the Company’s contracts, the only element that remains undelivered at the time of delivery of the software product is support services. Under the residual method, the fair value of the undelivered elements is deferred and the remaining portion of the contract fee is recognized as product revenues. If evidence of the fair value of one or more undelivered elements does not exist, all revenue is generally deferred and recognized when delivery of those elements occurs or when fair value can be established. When the undelivered element for which the Company does not have VSOE is support, revenue for the entire arrangement is bundled and recognized ratably over the support period.

VSOE for elements of an arrangement is based upon the normal pricing and discounting practices for those services when sold separately. In determining VSOE, the Company requires that a substantial majority of the selling prices for an element falls within a reasonably narrow pricing range, generally evidenced by a substantial majority of such historical stand-alone transactions falling within a reasonably narrow range of the median rates.

Third-party evidence (“TPE”) of selling price is determined based on competitor prices for similar deliverables when sold separately. However, the Company is typically not able to determine TPE for its products or services. Generally, the Company’s go-to-market strategy differs from that of its peers and the Company’s offerings contain a significant level of differentiation such that the comparable pricing of products with similar functionality cannot be obtained. Furthermore, the Company is unable to reliably determine the selling prices for similar products from competitors on a stand-alone basis. The Company establishes estimated selling prices (“ESP”) for support services based on its normal pricing and discounting practices for support services. This ESP analysis requires that a substantial majority of the support services selling prices fall within a reasonably narrow pricing range, which is typically broader than the range used to evidence VSOE. The Company believes that this is the price at which it would sell support services if support services were regularly sold on a stand-alone basis.

When the Company is unable to establish the selling price of its non-software elements using VSOE or TPE, the Company uses ESP in its allocation of arrangement consideration. The objective of ESP is the estimated price at which the Company would transact a sale if the product or service were sold on a stand-alone basis. The Company determines ESP for a product or service by considering multiple factors including, but not limited to, pricing policies, internal costs, gross margin objectives and discount from the list prices.

The Company regularly reviews VSOE and ESP and maintains internal controls over the establishment and updates of these estimates. There was no material impact during 2014, nor does the Company currently expect a material impact in the near term, from changes in VSOE or ESP.

The Company recognizes revenues when all of the following have occurred: (1) the Company has entered into a legally binding arrangement with a customer; (2) delivery has occurred; (3) customer payment is deemed fixed or determinable and free of contingencies and significant uncertainties; and (4) collection is probable. The sales prices for the Company’s products are typically considered to be fixed or determinable at the inception of an arrangement. Delivery is considered to have occurred when product title has transferred to the customer, when the service or training has been provided, when software is delivered, or when the support period has lapsed. To the extent that agreements contain rights of return or acceptance provisions, revenues are deferred until the acceptance provisions or rights of return lapse.

The majority of the Company’s sales are generated through its distributors. Revenues from distributors with return rights are recognized when the distributor reports that the product has been sold through, provided that all other revenue recognition criteria have been met. The Company obtains sell-through information from these distributors. For transactions with other distributors, the Company does not provide for rights of return and recognizes products revenues at the time of shipment, assuming all other revenue recognition criteria have been met. Sales to certain distributors were made pursuant to price discounts based on certain criteria, the Company accrues the estimated price discount as a reduction to both accounts receivable and net revenues.

Revenues for support services are recognized on a straight-line basis over the support period, which typically ranges from one year to five years.

Shipping charges billed to customers are included in products revenues and the related shipping costs are included in costs of products revenues.

Impairment of Long-Lived Assets

Impairment of Long-Lived Assets — The Company evaluates its long-lived assets for indicators of possible impairment when events or changes in circumstances indicate the carrying amount of an asset may not be recoverable. Impairment exists if the carrying amounts of such assets exceed the estimates of future net undiscounted cash flows expected to be generated by such assets. Should impairment exist, the impairment loss would be measured based on the excess carrying value of the asset over the asset’s estimated fair value. The Company has not incurred any impairment expense related to its long-lived assets during the years ended December 31, 2014, 2013 or 2012.

Goodwill

Goodwill — Goodwill represents the excess of the purchase price over the fair value of the net tangible and identifiable intangible assets acquired in a business combination. The Company reviews goodwill for impairment on an annual basis or whenever events or changes in circumstances indicate the carrying value may not be recoverable. The Company first assesses qualitative factors to determine whether it is more likely than not that the fair value of a reporting unit is less than its carrying amount as a basis for determining whether it is necessary to perform the two-step quantitative goodwill impairment test. If, after assessing the totality of circumstances, an entity determines that it is more likely than not that the fair value of a reporting unit is less than its carrying amount, then it is required to perform the two-step impairment test. It does not require an entity to calculate the fair value of a reporting unit unless the entity determines that it is more likely than not that its fair value is less than its carrying value. However, an entity also has the option to bypass the qualitative assessment for any reporting unit in any period and proceed directly to performing the first step of the two-step goodwill impairment test. The Company has determined that it has a single reporting unit for purposes of performing its goodwill impairment test. As the Company uses the market approach to assess impairment, its common stock price is an important component of the fair value calculation. If the Company’s stock price continues to experience significant price and volume fluctuations, this will impact the fair value of the reporting unit and can lead to potential impairment in future periods. The Company performed its annual impairment test in June 2014 and determined that its goodwill was not impaired. As of December 31, 2014, the Company had not identified any factors that indicated there was an impairment of its goodwill and determined that no additional impairment analysis was then required.

Fair Value of Financial Instruments

Fair Value of Financial Instruments — Due to their short-term nature, the carrying amounts of the Company’s financial instruments reported in the consolidated financial statements, which include cash, cash equivalents, accounts receivable, accounts payable and accrued liabilities approximate fair value. Based on borrowing rates currently available to the Company for loans with similar terms, the carrying value of the long-term debt approximates fair value.

Income Taxes

Income Taxes — As part of the process of preparing the Company’s consolidated financial statements, the Company is required to estimate its taxes in each of the jurisdictions in which it operates. The Company estimates actual current tax exposure together with assessing temporary differences resulting from differing treatment of items, such as accruals and allowances not currently deductible for tax purposes. These differences result in deferred tax assets and liabilities, which are included in the Company’s consolidated balance sheets. In general, deferred tax assets represent future tax benefits to be received when certain expenses previously recognized in the Company’s consolidated statements of operations become deductible expenses under applicable income tax laws or loss or credit carryforwards are utilized. Accordingly, realization of the Company’s deferred tax assets is dependent on future taxable income against which these deductions, losses, and credits can be utilized.

The Company must assess the likelihood that the Company’s deferred tax assets will be recovered from future taxable income, and to the extent the Company believes that recovery is not likely, the Company establishes a valuation allowance. Management judgment is required in determining the Company’s provision for income taxes, deferred tax assets and liabilities, and any valuation allowance recorded against the net deferred tax assets. The Company recorded a full valuation allowance as of December 31, 2014, 2013 and 2012. Based on the available evidence, the Company believes it is more likely than not that it will not be able to utilize its deferred tax assets in the future. The Company intends to maintain valuation allowances until sufficient evidence exists to support the reversal of such valuation allowances. The Company makes estimates and judgments about its future taxable income that are based on assumptions that are consistent with its plans. Should the actual amounts differ from the Company’s estimates, the carrying value of the Company’s deferred tax assets could be materially impacted.

The Company recognizes in the financial statements the impact of a tax position, if that position is more likely than not of being sustained on audit, based on the technical merits of the position. The Company’s policy is to recognize interest and penalties accrued on any unrecognized tax benefits as a component of income tax expense. The Company does not believe there are any tax positions for which it is reasonably possible that the total amounts of unrecognized tax benefits will significantly increase or decrease within 12 months of the reporting date.

Stock-Based Compensation

Stock-Based Compensation — Compensation costs related to employee stock awards that were either granted or modified during the years ended December 31, 2014, 2013 and 2012 are based on the fair value of the awards on the date of grant or modification, net of estimated forfeitures. The Company calculates the fair value of its restricted stock based on the fair market value on the date of grant. The Company determines the grant date fair value of its options and shares under its employee stock purchase plan using the Black-Scholes option-pricing model. The Company recognizes stock-based compensation expense on a straight-line basis over the vesting period of the respective option grants.

Research and Development Costs

Research and Development Costs — Research and development costs are expensed as incurred.

Software Development Costs

Software Development Costs — The costs to develop software have not been capitalized as the Company believes its current software development process is essentially completed concurrent with the establishment of technological feasibility.

Accounts Receivable

Accounts Receivable — Trade accounts receivable are recorded at the invoiced amount, net of allowances for doubtful accounts. The allowance for doubtful accounts is based on the Company’s assessment of the collectibility of customer accounts. The Company regularly reviews the allowance by considering certain factors such as historical experience, credit quality, age of the accounts receivable balances, and current economic conditions that may affect a customer’s ability to pay. During the years ended December 31, 2014, 2013 and 2012, the Company recorded bad debt expense of $148,000, $30,000 and $44,000. The Company collected previously written-off bad debt expense of $2,000, $8,000 and $54,000 during the years ended December 31, 2014, 2013 and 2012. Write-offs of previously reserved bad debts were approximately $34,000, $8,000 and $110,000 during the years ended December 31, 2014, 2013 and 2012.

Comprehensive Loss

Comprehensive Loss — Comprehensive loss is comprised of net loss and other comprehensive loss. For the Company, other comprehensive loss includes foreign currency translation adjustments. Total comprehensive loss for all periods presented has been disclosed in the consolidated statements of comprehensive loss.

Warranty

Warranty — The Company provides a warranty on products and estimated warranty costs are recorded during the period of sale. The Company establishes warranty reserves based on estimates of product warranty return rates and expected costs to repair or to replace the products under warranty. The Company’s accrual for anticipated warranty costs has declined primarily due to a decline in the historical volume of product returned under the warranty program. The warranty provision is recorded as a component of costs of products revenues in the condensed consolidated statements of operations.

Accrued warranty, which is included in accrued liabilities on the consolidated balance sheets, is summarized for the years ended December 31, 2014, 2013 and 2012 as follows (in thousands):

Years Ended December 31,

2014

2013

2012

Accrued warranty balance — beginning of period

1,345

870

662

Warranty costs incurred

(104

)

(101

)

(182

)

Provision for warranty for the period

218

576

390

Adjustment to pre-existing warranties

(866

)

—

Accrued warranty balance — end of period

593

1,345

870

Loss Contingencies

Loss Contingencies — The Company is or has been subject to proceedings, lawsuits and other claims arising in the ordinary course of business. The Company evaluates contingent liabilities, including threatened or pending litigation, for potential losses. If the potential loss from any claim or legal proceedings is considered probable and the amount can be estimated, the Company accrues a liability for the estimated loss. Because of uncertainties related to these matters, accruals are based upon the best information available. For potential losses for which there is a reasonable possibility (meaning the likelihood is more than remote but less than probable) that a loss exists, the Company will disclose an estimate of the potential loss or range of such potential loss or include a statement that an estimate of the potential loss cannot be made. As additional information becomes available, the Company reassesses the potential liability related to pending claims and litigation and may revise its estimates, which could materially impact its consolidated financial statements.

Recently Issued Accounting Pronouncements

2. Recently Issued Accounting Pronouncements

In May 2014, the Financial Accounting Standards Board (“FASB”) issued their guidance on revenue from contracts with customers. The guidance outlines a single comprehensive model for entities to use in accounting for revenue arising from contracts with customers and supersedes most current revenue recognition guidance, including industry-specific guidance. The guidance also requires enhanced disclosures regarding the nature, amount, timing and uncertainty of revenue and cash flows arising from an entity’s contracts with customers. The guidance is effective for public entities for reporting periods beginning after December 15, 2016, and interim and annual reporting periods thereafter. Early adoption is not permitted for public entities. The Company is currently evaluating the impact of the amended guidance on its consolidated financial position, results of operations and cash flows.

In June 2014, the FASB issued their guidance on accounting for share-based payments when the terms of an award provide that a performance target could be achieved after the requisite service period. The guidance requires that a performance target that affects vesting and that could be achieved after the requisite service period be treated as a performance condition. The guidance is effective for annual reporting periods, and interim periods within those years, beginning after December 15, 2015. Early adoption is permitted. The amendments may be applied prospectively to all awards granted or modified after the effective date or retrospectively to all awards with performance targets that are outstanding as of the beginning of the earliest annual period presented. The Company is currently evaluating the impact of the amended guidance on its consolidated financial statements.

Net Loss Per Share of Common Stock

Fair Value of Financial Instruments

Cost Method Investments

Equity investments, especially equity investments in private companies, are inherently risky. Many factors, including technical and product development challenges, market acceptance, competition, additional funding availability and the overall economy, could cause the investment to be impaired. The Company monitors the indicators of impairment of its investments. In the event that the fair value of an investment is below its carrying value and the impairment is other-than-temporary, the Company writes down the investment to its fair value.

Information about Geographic Areas

The Company considers operating segments to be components of the Company in which separate financial information is available that is evaluated regularly by the Company’s chief operating decision maker, or decision making group, in deciding how to allocate resources and in assessing performance. The chief operating decision maker for the Company is the CEO. The CEO reviews financial information presented on a consolidated basis, accompanied by information about revenue by geographic region, for purposes of allocating resources and evaluating financial performance. The Company has one business activity and there are no segment managers who are held accountable for operations, operating results or plans for levels or components below the consolidated unit level. Accordingly, the Company has determined that it has a single reporting segment and operating unit structure which is the development and marketing of wireless infrastructure solutions.

Business_and_Summary_of_Signif2

Business and Summary of Significant Accounting Policies (Tables)	12 Months Ended
	Dec. 31, 2014
Accounting Policies [Abstract]
Schedule of Company's Channel Partners Representing Greater than 10% of Net Revenues	The Company’s channel partners representing greater than 10% of net revenues for the periods presented were as follows (in percentages):


			Years Ended December 31,
	Major Channel Partners		2014			2013			2012
	Westcon Group, Inc.			26	%		26	%		25	%
	Siracom, Inc.			15			14			19
	Scansource Catalyst, Inc.			11			14			13
	Ingram Micro, Inc.			*			18			11

	*	Less than 10%
Schedule of Accrued Warranty	Accrued warranty, which is included in accrued liabilities on the consolidated balance sheets, is summarized for the years ended December 31, 2014, 2013 and 2012 as follows (in thousands):


			Years Ended December 31,
			2014			2013			2012
	Accrued warranty balance — beginning of period		$	1,345		$	870		$	662
	Warranty costs incurred			(104	)		(101	)		(182	)
	Provision for warranty for the period			218			576			390
	Adjustment to pre-existing warranties			(866	)		—			—

	Accrued warranty balance — end of period		$	593		$	1,345		$	870

Inventory_Tables

Inventory (Tables)	12 Months Ended
Inventory (Tables)	Dec. 31, 2014
Inventory Disclosure [Abstract]
Schedule of Inventory	Inventory as of December 31, 2014 and 2013 is as follows (in thousands):


		December 31,		December 31,
		2014		2013
	Finished goods	$	8,521	$	6,692
	Channel inventory		461		538

	Inventory	$	8,982	$	7,230

Net_Loss_Per_Share_of_Common_S1

Net Loss Per Share of Common Stock (Tables)	12 Months Ended
Net Loss Per Share of Common Stock (Tables)	Dec. 31, 2014
Earnings Per Share [Abstract]
Schedule of Outstanding Shares of Common Stock and Common Stock Equivalents Excluded from Computation of Diluted Net Loss per Share of Common Stock	The following outstanding shares of common stock and common stock equivalents were excluded from the computation of diluted net loss per share of common stock for the periods presented because including them would have been antidilutive:


			Years Ended December 31,
			2014		2013		2012
	Stock awards and stock options to purchase common stock*			4,626,504		4,628,668		4,498,964
	Common stock warrants			468,293		3,192,250		3,192,250

	*	Includes 289,515, 195,370 and 171,070 shares, which were expected to be issued pursuant to the Company’s Employee Stock Purchase Plan as of December 31, 2014, 2013 and 2012, respectively, based on employee enrollment.

Cost_Reduction_Program_Tables

Cost Reduction Program (Tables)	12 Months Ended
Cost Reduction Program (Tables)	Dec. 31, 2014
Restructuring and Related Activities [Abstract]
Schedule of Restructuring Expenses	The Company recorded the restructuring expenses in the consolidated statements of operations as follows (in thousands):


		Year Ended
		December 31, 2014
	Research and development	$	43
	Sales and marketing		419
	General and administrative		223

	Total restructuring expenses	$	685

Summary of the Restructuring Activities Included in Accrued Liabilities	The following table provides a summary of the restructuring activities included in accrued liabilities during the year 2014 (in thousands):


		Severance			Other Exit-			Total
		Severance			Related Costs			Total
	Balance at January 1, 2014	$	—		$	—		$	—
	Restructuring expenses		655			30			685
	Cash payments		(490	)		(13	)		(503	)
	Stock-based compensation		(147	)		—			(147	)

	Balance at December 31, 2014	$	18		$	17		$	35

Fair_Value_of_Financial_Instru1

Fair Value of Financial Instruments (Tables)

12 Months Ended

Dec. 31, 2014

Fair Value Disclosures [Abstract]

Schedule of Fair Value of Financial Assets

As of December 31, 2014, the Company’s fair value hierarchy for its financial assets was as follows (in thousands):

December 31, 2014

Quoted Prices in Active

Significant Other

Significant

Total

Markets for Identical

Observable

Unobservable

Instruments

(Level I)

(Level II)

(Level III)

Fair Value

Assets:

Money market funds

9,085

—

9,085

As of December 31, 2013, the Company’s fair value hierarchy for its financial assets was as follows (in thousands):

December 31, 2013

Quoted Prices in Active

Significant Other

Significant

Total

Markets for Identical

Observable

Unobservable

Instruments

(Level I)

(Level II)

(Level III)

Fair Value

Assets:

Money market funds

15,084

—

15,084

Goodwill_and_Intangible_Assets1

Goodwill and Intangible Assets (Tables)	12 Months Ended
Goodwill and Intangible Assets (Tables)	Dec. 31, 2014
Goodwill and Intangible Assets Disclosure [Abstract]
Schedule of Identifiable Intangible Assets	As of December 31, 2014, identifiable intangible assets were as follows (in thousands):


		As of December 31, 2014
		Estimated		Gross		Accumulated			Net
		Useful Life		Value		Amortization			Value
	Developed technology		3 years	$	630	$	(630	)	$	—

	Total			$	630	$	(630	)	$	—


	As of December 31, 2013, identifiable intangible assets were as follows (in thousands):


		As of December 31, 2013
		Estimated		Gross		Accumulated			Net
		Useful Life		Value		Amortization			Value
	Developed technology		3 years	$	630	$	(490	)	$	140
	Customer relationships		2 years		160		(160	)		—

	Total			$	790	$	(650	)	$	140

Schedule of Amortization Expense Related to Identified Intangible Assets	The Company recorded amortization expense related to these identified intangible assets in the consolidated statements of operations as follows (in thousands):


		Years Ended December 31,
		2014		2013		2012
	Costs of products revenues	$	140	$	210	$	210
	Sales and marketing		—		53		80

	Total amortization expense	$	140	$	263	$	290

Property_and_Equipment_Net_Tab

Property and Equipment, Net (Tables)	12 Months Ended
Property and Equipment, Net (Tables)	Dec. 31, 2014
Property, Plant and Equipment [Abstract]
Schedule of Property and Equipment, Net	Property and equipment, net as of December 31, 2014 and 2013 is as follows (in thousands):


		December 31,			December 31,
		2014			2013
	Computer equipment	$	2,642		$	2,361
	Computer software		2,029			1,807
	Machine and equipment		2,154			1,882
	Furniture and fixtures		132			134
	Leasehold improvements		1,409			1,434

	Property and equipment, gross		8,366			7,618
	Less accumulated depreciation and amortization		(6,487	)		(5,167	)

	Property and equipment, net	$	1,879		$	2,451

Accrued_Liabilities_Tables

Accrued Liabilities (Tables)	12 Months Ended
Accrued Liabilities (Tables)	Dec. 31, 2014
Payables and Accruals [Abstract]
Schedule of Accrued Liabilities	Accrued liabilities as of December 31, 2014 and 2013 consist of the following (in thousands):


		December 31,		December 31,
		2014		2013
	Accrued compensation and benefits	$	2,167	$	4,422
	Accrual for loan maturity payment		1,832		—
	Accrued commissions		1,204		2,008
	Accrued inventory		951		522
	Reserve for product warranty		593		1,345
	Income tax payable		531		525
	Sales returns reserve		329		319
	Marketing		327		645
	Accrued employee stock purchase plan		179		214
	Accrued professional service fees		130		229
	Other		1,980		2,306

		$	10,223	$	12,535

Commitments_and_Contingencies_

Commitments and Contingencies (Tables)	12 Months Ended
Commitments and Contingencies (Tables)	Dec. 31, 2014
Commitments and Contingencies Disclosure [Abstract]
Schedule of Commitments Under Operating Leases	Commitments under these operating leases are as follows (in thousands):


		Operating Leases
	Fiscal Years:
	2015	$	989
	2016		1,204
	2017		1,110
	2018		1,144
	2019		1,178
	Thereafter		297

	Total	$	5,922

Common_Stock_Tables

Common Stock (Tables)	12 Months Ended
Common Stock (Tables)	Dec. 31, 2014
Equity [Abstract]
Schedule of Assumptions Used to Determine Fair Value of Warrants	Upon issuance, the Company determined the fair value using the Black-Scholes option-pricing model with the following assumptions:


		June 2012
	Dividend rate		0	%
	Risk-free interest rate		0.7	%
	Expected life (in years)		5
	Expected volatility		59.1	%

Equity_Incentive_Plans_Tables

Equity Incentive Plans (Tables)	12 Months Ended
Equity Incentive Plans (Tables)	Dec. 31, 2014
Disclosure of Compensation Related Costs, Share-based Payments [Abstract]
Schedule of Weighted-Average Assumptions Used to Estimate Fair Value of Each Employee Stock Option	The fair value of each employee stock option was estimated at the date of grant using a Black-Scholes option-pricing model, with the following weighted-average assumptions for grants of options during the years ended December 31, 2014, 2013 and 2012:


			Years Ended
			December 31,
			2014			2013				2012
	Dividend rate			0	%		0	%			0	%
	Risk-free interest rate			1.3	%		0.7	%			0.9	%
	Expected life (in years)			4			4.1				4.9
	Expected volatility			73.6	%		71.5	%			61.8	%
Summary of Stock Award Activity	A summary of the Company’s stock award activity for the years ended December 31, 2014, 2013 and 2012 is presented below:


			Shares			Number				Weighted-				Weighted-				Aggregate
			Available			of Stock Options				Average				Average				Intrinsic
			for Grant			Outstanding				Exercise				Remaining				Value
										Price				Contractual				(in thousands)
														Life (Years)
	Outstanding — January 1, 2012			1,312,029			3,140,283			$	9.04
	Additional options authorized			706,982			—				—
	Options granted*			(1,776,682	)		1,776,682				3.09
	Inducement option granted			—			600,000				4.62
	Restricted stock granted			(620,259	)		—				—
	Cancelled options**			1,939,838			(1,939,838	)			9.66
	Restricted stock returned			190,560			—				—
	Exercised options			—			(61,175	)			1.21

	Outstanding — December 31, 2012			1,752,468			3,515,952				5.07
	Additional options authorized			738,559			—				—
	Inducement shares authorized			500,000			—				—
	Options granted			(386,175	)		386,175				3.59
	Inducement restricted stock units granted			(315,000	)		—				—
	Restricted stock granted			(1,449,352	)		—				—
	Cancelled options			996,167			(996,167	)			5.7
	Restricted stock returned			396,136			—				—
	Exercised options			—			(72,382	)			3.53

	Outstanding — December 31, 2013			2,232,803			2,833,578				4.68
	Additional options authorized			917,598			—				—
	Options granted			(10,000	)		10,000				4.15
	Restricted stock granted			(1,632,971	)		—				—
	Cancelled options			350,679			(350,679	)			4.71
	Restricted stock returned			543,039			—				—
	Exercised options			—			(173,322	)			2.85

	Outstanding — December 31, 2014			2,401,148			2,319,577			$	4.81				6.8			$	789

	Vested and expected to vest — December 31, 2014						2,002,439			$	4.94				6.7			$	678
	Vested — December 31, 2014						1,629,875			$	5.27				6.5			$	472

	*	Includes options to purchase 692,682 shares of common stock, which were issued pursuant to the Company’s Exchange Offer program.
	**	Includes options to purchase 960,443 shares of common stock, which were cancelled pursuant to the Company’s Exchange Offer program.
Schedule of Additional Information Regarding Company's Stock Options Outstanding and Vested	Additional information regarding the Company’s stock options outstanding and vested as of December 31, 2014 is summarized below:


			Options Outstanding									Options Vested and
			Options Outstanding									Exercisable
						Weighted-Average		Weighted-								Weighted-
						Remaining		Average								Average
						Contractual Life		Exercise								Exercise
	Exercise Prices		Shares			(Years)		Price per Share				Shares				Price per Share
	$0.91 - $2.17			230,235		7.2		$	1.66				136,600			$	1.64
	$2.18 - $4.33			888,673		7.7		$	3.44				530,717			$	3.44
	$4.34 - $6.50			835,834		6.9		$	4.83				604,501			$	4.84
	$6.51 - $8.67			246,709		4.5		$	7.9				241,331			$	7.92
	$8.68 - $19.51			118,126		3.9		$	14.68				116,726			$	14.66

				2,319,577		6.8		$	4.81				1,629,875			$	5.27

Summary of RSA Activity	A summary of the Company’s RSA activity for the years ended December 31, 2014, 2013 and 2012 is presented below:


			Number			Weighted				Aggregate
			of Restricted			Average Grant				Intrinsic
			Stock Awards			Date Fair				Value
			Outstanding			Value				(in thousands)
	Outstanding — January 1, 2012			3,600		$	13.73			$	14
	Restricted stock awards granted			—			—
	Restricted stock awards released			(1,200	)		13.73
	Restricted stock awards forfeited			—			—

	Outstanding — December 31, 2012			2,400			13.73				6
	Restricted stock awards granted			—			—
	Restricted stock awards released			(1,200	)		13.73
	Restricted stock awards forfeited			(1,200	)		13.73

	Outstanding — December 31, 2013			—			—				—
	Restricted stock awards granted			—			—
	Restricted stock awards released			—			—
	Restricted stock awards forfeited			—			—

	Outstanding — December 31, 2014			—		$	—			$	—

Summary of RSU Activity	A summary of the Company’s RSU activity for the years ended December 31, 2014, 2013 and 2012 is presented below:


			Number			Weighted				Aggregate
			of Restricted			Average Grant				Intrinsic
			Stock Units			Date Fair				Value
			Outstanding			Value				(in thousands)
	Outstanding — January 1, 2012			645,685		$	12.24			$	2,667
	Restricted stock units granted			720,259			3.93
	Restricted stock units released			(448,327	)		7.78
	Restricted stock units forfeited			(108,075	)		12.26

	Outstanding — December 31, 2012			809,542			7.32				2,145
	Restricted stock units granted			1,764,352			3.91
	Restricted stock units released			(624,896	)		5.68
	Restricted stock units forfeited			(349,278	)		6.27

	Outstanding — December 31, 2013			1,599,720			4.43				6,895
	Restricted stock units granted			1,632,971			4.2
	Restricted stock units released			(887,744	)		4.64
	Restricted stock units forfeited			(327,535	)		4.2

	Outstanding — December 31, 2014			2,017,412		$	4.13			$	7,571

Schedule of Weighted-Average Assumptions Used to Calculate Compensation Expense for ESPP	The Company calculated the compensation expense for the ESPP using the Black-Scholes option-pricing model with the following weighted-average assumptions during the years ended December 31, 2014, 2013 and 2012:


			Years Ended December 31,
			2014			2013				2012
	Dividend rate			0	%		0	%			0	%
	Risk-free interest rate			0.1	%		0.1	%			0.2	%
	Expected life (in years)			0.8			0.8				0.7
	Expected volatility			47.3	%		84.4	%			89.7	%

Income_Taxes_Tables

Income Taxes (Tables)	12 Months Ended
Income Taxes (Tables)	Dec. 31, 2014
Income Tax Disclosure [Abstract]
Schedule of Loss Before Provision for Income Taxes	The Company’s loss before provision for income taxes for the years ended December 31, 2014, 2013 and 2012 is as follows (in thousands):


		Years ended December 31,
		2014			2013			2012
	Domestic	$	(22,263	)	$	(13,724	)	$	(32,502	)
	International		1,903			1,801			1,963

	Loss before provision for income taxes	$	(20,360	)	$	(11,923	)	$	(30,539	)

Schedule of Components of Provision for Income Taxes	The components of the provision for income taxes for the years ended December 31, 2014, 2013 and 2012 are as follows (in thousands):


		Years ended December 31,
		2014			2013			2012
	Current
	Federal	$	—		$	—		$	—
	State		11			(2	)		25
	Foreign		508			445			524

	Total current		519			443			549

	Deferred
	Federal		—			—			—
	State		—			—			—
	Foreign		—			—			—

	Total deferred		—			—			—

	Total provision for income taxes	$	519		$	443		$	549

Schedule of Reconciliations of Statutory Federal Income Tax to Effective Tax	Reconciliations of the statutory federal income tax to the Company’s effective tax for the years ended December 31, 2014, 2013 and 2012 are as follows (in thousands):


		Years ended December 31,
		2014			2013			2012
	Tax at statutory federal rate	$	(6,923	)	$	(4,054	)	$	(10,383	)
	State tax — net of federal benefit		(449	)		(275	)		(1,553	)
	Nondeductible expenses		775			790			1,279
	Foreign income rate differential		(138	)		(635	)		(698	)
	Foreign tax		444			413			486
	Credits		(957	)		(631	)		(347	)
	Change in state apportionment		83			1,774			—
	Other		547			866			(596	)
	Valuation allowance changes affecting the tax provision		7,137			2,195			12,361

	Provision for income taxes	$	519		$	443		$	549

Schedule of Net Deferred Tax Assets	Net deferred tax assets as of December 31, 2014 and 2013 consist of the following (in thousands):


		December 31,			December 31,
		2014			2013
	Deferred tax assets:
	Depreciation and amortization	$	12,081		$	11,298
	Accruals and other		14,598			14,876
	Research and other credits		6,925			5,968
	Net operating loss carryforward		59,541			53,867

	Gross deferred tax asset		93,145			86,009
	Valuation allowance		(93,145	)		(86,009	)

	Net deferred tax assets	$	—		$	—

Schedule of Reconciliation of Beginning and Ending Unrecognized Tax Benefit Amounts	A reconciliation of the beginning and ending unrecognized tax benefit amounts since adoption is as follows (in thousands):


	Balance at January 1, 2012	$	1,949
	Increase related to 2012 tax position		134

	Balance at December 31, 2012		2,083
	Increase related to 2013 tax position		241

	Balance at December 31, 2013		2,324
	Increase related to 2014 tax position		296

	Balance at December 31, 2014	$	2,620

Information_about_Geographic_A1

Information about Geographic Areas (Tables)	12 Months Ended
Information about Geographic Areas (Tables)	Dec. 31, 2014
Segment Reporting [Abstract]
Schedule of Revenues and Long-lived Assets by Geographic Area	The following table sets forth revenue by geographic area (in thousands):


		Years ended December 31,
		2014		2013		2012
	United States	$	43,975	$	57,961	$	50,443
	United Kingdom		18,539		19,676		21,476
	Rest of EMEA		10,702		11,176		11,077
	Rest of Americas		7,057		7,273		5,373
	Asia Pacific		10,618		9,661		9,141

	Total	$	90,891	$	105,747	$	97,510

	Long-Lived Assets
	The following table sets forth long-lived assets by geographic area (in thousands):


		December 31,		December 31,
		2014		2013
	United States	$	1,144	$	1,390
	India		721		1,055
	United Kingdom		13		—
	Japan		1		6

	Total	$	1,879	$	2,451

Business_and_Summary_of_Signif3

Business and Summary of Significant Accounting Policies - Additional Information 1 (Detail) (USD $)	12 Months Ended
In Thousands, unless otherwise specified	Dec. 31, 2014	Dec. 31, 2013	Dec. 31, 2012
	Customer	Customer	Customer
Concentration Risk [Line Items]
Allowance for doubtful accounts	140	28
Accounts Receivable [Member] \| Concentration of Credit Risk [Member] \| Distributor Customers [Member]
Concentration Risk [Line Items]
Number of significant customers	3	2
Concentration risk, percentage	39.00%	53.00%
Net Revenues [Member] \| Minimum [Member]
Concentration Risk [Line Items]
Number of significant customers	0	0	0
Concentration risk, percentage	10.00%	10.00%	10.00%

Business_and_Summary_of_Signif4

Business and Summary of Significant Accounting Policies - Schedule of Company's Channel Partners Representing Greater than 10% of Net Revenues (Detail) (Net Revenues [Member], Concentration of Credit Risk [Member])	12 Months Ended
	Dec. 31, 2014	Dec. 31, 2013	Dec. 31, 2012
Westcon Group Inc. [Member]
Concentration Risk [Line Items]
Concentration risk, percentage	26.00%	26.00%	25.00%
Siracom, Inc. [Member]
Concentration Risk [Line Items]
Concentration risk, percentage	15.00%	14.00%	19.00%
Scansource Catalyst, Inc. [Member]
Concentration Risk [Line Items]
Concentration risk, percentage	11.00%	14.00%	13.00%
Ingram Micro Inc. [Member]
Concentration Risk [Line Items]
Concentration risk, percentage		18.00%	11.00%

Business_and_Summary_of_Signif5

Business and Summary of Significant Accounting Policies - Schedule of Company's Channel Partners Representing Greater than 10% of Net Revenues (Parenthetical) (Detail) (Concentration of Credit Risk [Member], Ingram Micro Inc. [Member], Net Revenues [Member])	12 Months Ended
	Dec. 31, 2013	Dec. 31, 2012	Dec. 31, 2014
Concentration Risk [Line Items]
Concentration risk, percentage	18.00%	11.00%
Maximum [Member]
Concentration Risk [Line Items]
Concentration risk, percentage			10.00%

Business_and_Summary_of_Signif6

Business and Summary of Significant Accounting Policies - Additional Information 2 (Detail) (USD $)	12 Months Ended
	Dec. 31, 2014	Dec. 31, 2013	Dec. 31, 2012
Accounting Policies [Abstract]
Cash equivalents maturity	Three months or less
Maximum salable period	18 months
Advertising expense	$53,000	$71,000	$700,000
Bad debt expense	148,000	30,000	44,000
Collection of previously written-off bad debt expense	2,000	8,000	54,000
Write-offs of previously reserved debts	$34,000	$8,000	$110,000

Business_and_Summary_of_Signif7

Business and Summary of Significant Accounting Policies - Additional Information 3 (Detail) (USD $)	12 Months Ended
	Dec. 31, 2014	Dec. 31, 2013	Dec. 31, 2012
Property, Plant and Equipment [Line Items]
Estimated service life of internal test units transferred from inventory	1 year
Impairment expenses on long-lived assets	$0	$0	$0
Minimum [Member]
Property, Plant and Equipment [Line Items]
Estimated useful lives	3 years
Maximum [Member]
Property, Plant and Equipment [Line Items]
Estimated useful lives	5 years

Business_and_Summary_of_Signif8

Business and Summary of Significant Accounting Policies - Additional Information 4 (Detail)	12 Months Ended
	Dec. 31, 2014
Minimum [Member]
Revenue Recognition, Multiple-deliverable Arrangements [Line Items]
Period for recognition of revenues for support services	1 year
Maximum [Member]
Revenue Recognition, Multiple-deliverable Arrangements [Line Items]
Period for recognition of revenues for support services	5 years

Business_and_Summary_of_Signif9

Business and Summary of Significant Accounting Policies - Schedule of Accrued Warranty (Detail) (USD $)	12 Months Ended
In Thousands, unless otherwise specified	Dec. 31, 2014	Dec. 31, 2013	Dec. 31, 2012
Product Warranties Disclosures [Abstract]
Accrued warranty balance - beginning of period	$1,345	$870	$662
Warranty costs incurred	-104	-101	-182
Provision for warranty for the period	218	576	390
Adjustment to pre-existing warranties	-866
Accrued warranty balance - end of period	$593	$1,345	$870

Inventory_Schedule_of_Inventor

Inventory - Schedule of Inventory (Detail) (USD $)	Dec. 31, 2014	Dec. 31, 2013
In Thousands, unless otherwise specified	Dec. 31, 2014	Dec. 31, 2013
Inventory Disclosure [Abstract]
Finished goods	$8,521	$6,692
Channel inventory	461	538
Inventory	$8,982	$7,230

Net_Loss_Per_Share_of_Common_S2

Net Loss Per Share of Common Stock - Schedule of Outstanding Shares of Common Stock and Common Stock Equivalents Excluded from Computation of Diluted Net Loss Per Share of Common Stock (Detail)	12 Months Ended
	Dec. 31, 2014	Dec. 31, 2013	Dec. 31, 2012
Stock Awards and Stock Options to Purchase Common Stock [Member]
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items]
Shares excluded from the computation of diluted net loss per share of common stock	4,626,504	4,628,668	4,498,964
Common Stock Warrants [Member]
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items]
Shares excluded from the computation of diluted net loss per share of common stock	468,293	3,192,250	3,192,250

Net_Loss_Per_Share_of_Common_S3

Net Loss Per Share of Common Stock - Schedule of Outstanding Shares of Common Stock and Common Stock Equivalents Excluded from Computation of Diluted Net Loss Per Share of Common Stock (Parenthetical) (Detail) (Employee Stock Purchase Plan [Member])	12 Months Ended
	Dec. 31, 2014	Dec. 31, 2013	Dec. 31, 2012
Employee Stock Purchase Plan [Member]
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items]
Shares excluded from the computation of diluted net loss per share of common stock	289,515	195,370	171,070

Cost_Reduction_Program_Additio

Cost Reduction Program - Additional Information (Detail) (USD $)	12 Months Ended
	Dec. 31, 2014
	Positions
Restructuring Cost and Reserve [Line Items]
Restructuring cost	$685,000
Number of positions eliminated	18
Stock-based compensation expense related to restructuring	147,000
Remaining estimated costs	35,000
Expected payment date of remaining estimated costs	31-Mar-15
Restricted Stock Units [Member]
Restructuring Cost and Reserve [Line Items]
Accelerated vesting of restricted stock units	59,000
Number of employee affected	2
Severance [Member]
Restructuring Cost and Reserve [Line Items]
Restructuring cost	655,000
Stock-based compensation expense related to restructuring	147,000
Adjustments to reduce a accrued expenses	$50,000

Cost_Reduction_Program_Schedul

Cost Reduction Program - Schedule of Restructuring Expenses (Detail) (USD $)	12 Months Ended
In Thousands, unless otherwise specified	Dec. 31, 2014
Restructuring Cost and Reserve [Line Items]
Total restructuring expenses	$685
Research and Development [Member]
Restructuring Cost and Reserve [Line Items]
Total restructuring expenses	43
Sales and Marketing [Member]
Restructuring Cost and Reserve [Line Items]
Total restructuring expenses	419
General and Administrative [Member]
Restructuring Cost and Reserve [Line Items]
Total restructuring expenses	$223

Cost_Reduction_Program_Summary

Cost Reduction Program - Summary of the Restructuring Activities Included in Accrued Liabilities (Detail) (USD $)	12 Months Ended
In Thousands, unless otherwise specified	Dec. 31, 2014
Restructuring Cost and Reserve [Line Items]
Beginning balance	$0
Restructuring expenses	685
Cash payments	-503
Stock-based compensation	-147
Ending balance	35
Severance [Member]
Restructuring Cost and Reserve [Line Items]
Beginning balance	0
Restructuring expenses	655
Cash payments	-490
Stock-based compensation	-147
Ending balance	18
Other Exit- Related Costs [Member]
Restructuring Cost and Reserve [Line Items]
Beginning balance	0
Restructuring expenses	30
Cash payments	-13
Ending balance	$17

Fair_Value_of_Financial_Instru2

Fair Value of Financial Instruments - Additional Information (Detail) (USD $)	Dec. 31, 2014	Dec. 31, 2013
Fair Value Disclosures [Abstract]
Financial liabilities that are measured at fair value on a recurring basis	$0	$0
Fair value assets transfers between Level I to Level II	0	0
Fair value assets transfers between Level II to Level I	$0	$0

Fair_Value_of_Financial_Instru3

Fair Value of Financial Instruments - Schedule of Fair Value of Financial Assets (Detail) (Recurring [Member], Money Market Funds [Member], USD $)	Dec. 31, 2014	Dec. 31, 2013
In Thousands, unless otherwise specified	Dec. 31, 2014	Dec. 31, 2013
Quoted Prices in Active Markets for Identical Instruments (Level 1) [Member]
Assets:
Fair value of financial assets	$9,085	$15,084
Total Fair Value [Member]
Assets:
Fair value of financial assets	$9,085	$15,084

Goodwill_and_Intangible_Assets2

Goodwill and Intangible Assets - Additional Information (Detail) (USD $)	Dec. 31, 2014	Dec. 31, 2013
In Thousands, unless otherwise specified	Dec. 31, 2014	Dec. 31, 2013
Goodwill and Intangible Assets Disclosure [Abstract]
Goodwill	$1,658	$1,658

Goodwill_and_Intangible_Assets3

Goodwill and Intangible Assets - Schedule of Identifiable Intangible Assets (Detail) (USD $)	12 Months Ended
In Thousands, unless otherwise specified	Dec. 31, 2014	Dec. 31, 2013
Acquired Finite-Lived Intangible Assets [Line Items]
Gross Value	$630	$790
Accumulated Amortization	-630	-650
Net Value		140
Developed Technology [Member]
Acquired Finite-Lived Intangible Assets [Line Items]
Estimated Useful Life	3 years	3 years
Gross Value	630	630
Accumulated Amortization	-630	-490
Net Value		140
Customer Relationships [Member]
Acquired Finite-Lived Intangible Assets [Line Items]
Estimated Useful Life		2 years
Gross Value		160
Accumulated Amortization		($160)

Goodwill_and_Intangible_Assets4

Goodwill and Intangible Assets - Schedule of Amortization Expense Related to Identified Intangible Assets (Detail) (USD $)	12 Months Ended
In Thousands, unless otherwise specified	Dec. 31, 2014	Dec. 31, 2013	Dec. 31, 2012
Acquired Finite-Lived Intangible Assets [Line Items]
Total amortization expense	$140	$263	$290
Costs of Revenues [Member]
Acquired Finite-Lived Intangible Assets [Line Items]
Total amortization expense	140	210	210
Sales and Marketing [Member]
Acquired Finite-Lived Intangible Assets [Line Items]
Total amortization expense		$53	$80

Cost_Method_Investments_Additi

Cost Method Investments - Additional Information (Detail) (USD $)	12 Months Ended
	Dec. 31, 2014	Dec. 31, 2013	Dec. 31, 2012	Dec. 31, 2011
Schedule of Cost-method Investments [Line Items]
Investment amount included in other assets	$1,300,000	$1,300,000
Cost method investments, impairment	0	0	0
Private Company Co-Founded by Dr. Vaduvur Bharghavan [Member]
Schedule of Cost-method Investments [Line Items]
Amount invested in a company co-founded by Dr. Vaduvur Bharghavan				$1,300,000

Property_and_Equipment_Net_Sch

Property and Equipment, Net - Schedule of Property and Equipment, Net (Detail) (USD $)	Dec. 31, 2014	Dec. 31, 2013
In Thousands, unless otherwise specified	Dec. 31, 2014	Dec. 31, 2013
Property, Plant and Equipment [Line Items]
Property and equipment, gross	$8,366	$7,618
Less accumulated depreciation and amortization	-6,487	-5,167
Property and equipment, net	1,879	2,451
Computer Equipment [Member]
Property, Plant and Equipment [Line Items]
Property and equipment, gross	2,642	2,361
Computer Software [Member]
Property, Plant and Equipment [Line Items]
Property and equipment, gross	2,029	1,807
Machine and Equipment [Member]
Property, Plant and Equipment [Line Items]
Property and equipment, gross	2,154	1,882
Furniture and Fixtures [Member]
Property, Plant and Equipment [Line Items]
Property and equipment, gross	132	134
Leasehold Improvements [Member]
Property, Plant and Equipment [Line Items]
Property and equipment, gross	$1,409	$1,434

Property_and_Equipment_Net_Add

Property and Equipment, Net - Additional Information (Detail) (USD $)	12 Months Ended
In Millions, unless otherwise specified	Dec. 31, 2014	Dec. 31, 2013	Dec. 31, 2012
Property, Plant and Equipment [Abstract]
Depreciation and amortization expense	$1.40	$1.30	$0.90

Accrued_Liabilities_Schedule_o

Accrued Liabilities - Schedule of Accrued Liabilities (Detail) (USD $)	Dec. 31, 2014	Dec. 31, 2013	Dec. 31, 2012	Dec. 31, 2011
In Thousands, unless otherwise specified	Dec. 31, 2014	Dec. 31, 2013	Dec. 31, 2012	Dec. 31, 2011
Payables and Accruals [Abstract]
Accrued compensation and benefits	$2,167	$4,422
Accrual for loan maturity payment	1,832
Accrued commissions	1,204	2,008
Accrued inventory	951	522
Reserve for product warranty	593	1,345	870	662
Income tax payable	531	525
Sales returns reserve	329	319
Marketing	327	645
Accrued employee stock purchase plan	179	214
Accrued professional service fees	130	229
Other	1,980	2,306
Accrued liabilities	$10,223	$12,535

Borrowings_Additional_Informat

Borrowings - Additional Information (Detail) (USD $)	1 Months Ended	12 Months Ended
	Jun. 30, 2012	Dec. 31, 2014	Dec. 31, 2013
	Jun. 30, 2012	Installment	Dec. 31, 2013
Debt Instrument [Line Items]
Long-term debt, current portion		$2,803,000	$3,718,000
Long-Term Debt [Member]
Debt Instrument [Line Items]
Amount of debt financing	12,000,000
Gross proceeds from long-term debt	11,700,000
Debt issuance costs	162,000	162,000
Fixed interest rate		12.00%
Number of equal installments		39
Monthly payments for both principal and interest		369,405
Additional payment required to be made at the earlier occurrence of change of control or maturity date of VLL agreement		2,000,000
Additional interest expense		500,000	800,000
Debt instrument, maturity date		1-Sep-15
Number of securities that can be purchased from warrants issued		468,293
Exercise price of warrant, per share		$2.05
Fair value of warrant recorded as debt discount		384,000
Aggregate debt discounts		546,000
Net interest expense, related to the debt discounts		128,000	226,000
Unamortized discounts		$24,000
Warrant expiration date		1-Jun-17
Long-Term Debt [Member] \| Period on or After January 1, 2014 [Member]
Debt Instrument [Line Items]
Prepayment penalty		80.00%

Commitments_and_Contingencies_1

Commitments and Contingencies - Additional Information (Detail) (USD $)	12 Months Ended
	Dec. 31, 2014	Dec. 31, 2013	Dec. 31, 2012
Loss Contingencies [Line Items]
Amount expensed by the entity			$2,350,000
Additional number of years for which lease can be renewed	5 years
Rent expense related to noncancelable operating leases	1,800,000	1,800,000	2,100,000
Other commitments consisting of inventory and other non-cancelable purchase obligations	6,900,000
Office Space Leased for Headquarters [Member]
Loss Contingencies [Line Items]
Area leased	44,000
Operating lease expiration period	2020-03
Space for Research and Development Facility [Member]
Loss Contingencies [Line Items]
Area leased	35,000
Operating lease expiration year	2016
Extricom Ltd [Member]
Loss Contingencies [Line Items]
Amount expensed by the entity			$2,400,000

Commitments_and_Contingencies_2

Commitments and Contingencies - Schedule of Commitments Under Operating Leases (Detail) (USD $)	Dec. 31, 2014
In Thousands, unless otherwise specified	Dec. 31, 2014
Fiscal Years:
2015	$989
2016	1,204
2017	1,110
2018	1,144
2019	1,178
Thereafter	297
Total	$5,922

Common_Stock_Additional_Inform

Common Stock - Additional Information (Detail) (USD $)	12 Months Ended	0 Months Ended		12 Months Ended			36 Months Ended
Common Stock - Additional Information (Detail) (USD $)	Dec. 31, 2013	Mar. 04, 2013	Feb. 27, 2013	Dec. 31, 2014	Dec. 31, 2011	Dec. 31, 2010	Dec. 31, 2014	Jun. 30, 2012	Mar. 12, 2014	Dec. 31, 2009
Class of Warrant or Right [Line Items]
Common stock, par value	$0.00			0.0005			0.0005
Proceeds from issuance of common stock, net of underwriting discount, commission and other issuance costs	$12,574,000
Underwriting Agreement [Member]
Class of Warrant or Right [Line Items]
Number of common stock shares the Company agreed to sell due to underwriting agreement			3,000,000
Common stock, par value			$0.00
Common stock price per share			$4
Period granted to underwriter for purchase of additional shares			30 days
Common stock issued to underwriter under an over-allotment option			450,000
Sale of common stock to underwriter		3,450,000
Proceeds from issuance of common stock, net of underwriting discount, commission and other issuance costs		12,600,000
Common Stock Warrant Issued in Connection with VLL Agreement [Member]
Class of Warrant or Right [Line Items]
Number of securities that can be purchased from warrants issued								468,293
Exercise price of warrants								$2.05
Warrant expiration date				1-Jun-17
Fair value of warrant recorded as debt discount								$384,000
Common Stock Warrant [Member]
Class of Warrant or Right [Line Items]
Number of securities that can be purchased from warrants issued						36,582				4,007,432
Number of warrants to purchase shares exercised					1,265,293	54,764	0
Warrant expiry date				2014
Shares issued upon exercise of warrants					548,125	19,072
Warrants outstanding									2,723,957
Common stock warrant expired unexercised date				12-Mar-14
Common Stock Warrant [Member] \| Minimum [Member]
Class of Warrant or Right [Line Items]
Exercise price of warrants				9.78			9.78
Common Stock Warrant [Member] \| Maximum [Member]
Class of Warrant or Right [Line Items]
Exercise price of warrants				11.74			11.74

Common_Stock_Schedule_of_Assum

Common Stock - Schedule of Assumptions Used to Determine Fair Value of Warrants (Detail)	1 Months Ended
	Jun. 30, 2012
Warrants and Rights Note Disclosure [Abstract]
Dividend rate	0.00%
Risk-free interest rate	0.70%
Expected life (in years)	5 years
Expected volatility	59.10%

Equity_Incentive_Plans_Additio

Equity Incentive Plans - Additional Information (Detail) (USD $)	12 Months Ended			0 Months Ended		1 Months Ended
	Dec. 31, 2014	Dec. 31, 2013	Dec. 31, 2012	Jul. 26, 2012	Aug. 23, 2012	Mar. 31, 2012	Dec. 31, 2011	Jun. 26, 2012	Jun. 06, 2013
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Outstanding at the end of the period	2,401,148	2,232,803	1,752,468				1,312,029
Stock-based compensation expense	$5,747,000	$6,546,000	$7,549,000
Weighted average grant date fair value of the stock options granted	$2.30	$1.94	$2.88
Aggregate grant date fair value	23,000	700,000	6,800,000
Stock-based compensation expense	1,300,000	1,600,000	3,500,000
Total compensation cost related to unvested stock-based awards not yet recognized	6,800,000
Weighted-average remaining period to amortize compensation cost not yet recognized	1 year 10 months 24 days
Stock Options [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Options granted	10,000	386,175	1,776,682
Options outstanding	2,319,577	2,833,578	3,515,952				3,140,283
Exercise price	$2.85	$3.53	$1.21
Restricted Stock Units [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Number of restricted stock units issued	1,632,971	1,764,352	720,259
Number of restricted stock units fully vested	887,744	624,896	448,327
Eligible Options [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Options to purchase shares of common stock (the "Exchanged Options") were cancelled and exchanged under tender offer				960,443
Eligible Options [Member] \| Minimum [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Exercise price to be eligible for tender offer (in dollars per share)								$2
New Option [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Options granted				692,682
Percentage of options vesting after the first year of service				25.00%
Remaining vesting period of options				36 months
Exercise price					$3.40
Incremental charge due to modification					500,000
Amortization period of incremental charge					4 years
2013 Plan [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Shares of common stock reserved for future issuance									500,000
Number of restricted stock units issued	315,000
Number of restricted stock units fully vested	105,000
Outstanding at the end of the period	185,000
2013 Plan [Member] \| Restricted Stock Units [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Number of restricted stock units issued		315,000
CEO Inducement Plan and Agreement [Member] \| Stock Options [Member] \| Dr. Bami Bastani, CEO [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Options granted						600,000
Service-Based Restricted Stock Unit Plan and Agreement [Member] \| Restricted Stock Units [Member] \| Dr. Bami Bastani, CEO [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Number of restricted stock units fully vested	50,000
Shares granted						50,000
Performance-Based Restricted Stock Unit Plan and Agreement [Member] \| Restricted Stock Units [Member] \| Dr. Bami Bastani, CEO [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Shares granted						50,000
Number of restricted stock units cancelled	50,000
Inducement Stock Option Plan [Member] \| Stock Options [Member] \| Dr. Bami Bastani, CEO [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Options outstanding	600,000
2010 Plan [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Maximum increase in the number of shares reserved for issuance on the first day of each of the company's fiscal years	4.00%
Aggregate intrinsic value of options exercised	$200,000	$100,000	$100,000
2010 Plan [Member] \| Restricted Stock Units [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Number of restricted stock units issued	1,632,971	1,449,352

Equity_Incentive_Plans_Schedul

Equity Incentive Plans - Schedule of Weighted-Average Assumptions Used to Estimate Fair Value of Each Employee Stock Option (Detail) (Stock Options [Member])	12 Months Ended
	Dec. 31, 2014	Dec. 31, 2013	Dec. 31, 2012
Stock Options [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Dividend rate	0.00%	0.00%	0.00%
Risk-free interest rate	1.30%	0.70%	0.90%
Expected life (in years)	4 years	4 years 1 month 6 days	4 years 10 months 24 days
Expected volatility	73.60%	71.50%	61.80%

Equity_Incentive_Plans_Summary

Equity Incentive Plans - Summary of Stock Award Activity (Detail) (USD $)	12 Months Ended
In Thousands, except Share data, unless otherwise specified	Dec. 31, 2014	Dec. 31, 2013	Dec. 31, 2012
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Beginning balance, Shares Available for Grant	2,232,803	1,752,468	1,312,029
Additional options authorized, Shares Available for Grant	917,598	738,559	706,982
Options granted, Shares Available for Grant	-10,000	-386,175	-1,776,682
Restricted stock granted, Shares Available for Grant	-1,632,971	-1,449,352	-620,259
Cancelled options, Shares Available for Grant	350,679	996,167	1,939,838
Restricted stock returned, Shares Available for Grant	543,039	396,136	190,560
Exercised options, Shares Available for Grant	0	0	0
Ending balance, Shares Available for Grant	2,401,148	2,232,803	1,752,468
Inducement shares authorized, Shares Available for Grant		500,000
Inducement restricted stock units granted, Shares Available for Grant		-315,000
Stock Options [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Beginning balance, Number of Stock Options Outstanding	2,833,578	3,515,952	3,140,283
Options granted, Number of Stock Options Outstanding	10,000	386,175	1,776,682
Inducement option granted, Number of Stock Options Outstanding			600,000
Cancelled options, Number of Stock Options Outstanding	-350,679	-996,167	-1,939,838
Exercised options, Number of Stock Options Outstanding	-173,322	-72,382	-61,175
Ending balance, Number of Stock Options Outstanding	2,319,577	2,833,578	3,515,952
Vested and expected to vest at the end of the period, Number of Stock Options Outstanding	2,002,439
Vested at the end of the period, Number of Stock Options Outstanding	1,629,875
Beginning balance, Weighted- Average Exercise Price	4.68	5.07	9.04
Options granted, Weighted- Average Exercise Price	4.15	3.59	3.09
Inducement option granted, Weighted- Average Exercise Price			4.62
Cancelled options, Weighted- Average Exercise Price	4.71	5.7	9.66
Exercised options, Weighted- Average Exercise Price	2.85	3.53	1.21
Ending balance, Weighted- Average Exercise Price	4.81	4.68	5.07
Vested and expected to vest at the end of the period, Weighted- Average Exercise Price	4.94
Vested at the end of the period, Weighted- Average Exercise Price	5.27
Weighted- Average Remaining Contractual Life (Years)	6 years 9 months 18 days
Vested and expected to vest at the end of the period, Weighted Average Remaining Contractual Life (Years)	6 years 8 months 12 days
Vested at the end of the period, Weighted-Average Remaining Contractual Life (Years)	6 years 6 months
Aggregate Intrinsic Value	789
Vested and expected to vest at the end of the period, Aggregate Intrinsic Value	678
Vested at the end of the period, Aggregate Intrinsic Value	472

Equity_Incentive_Plans_Summary1

Equity Incentive Plans - Summary of Stock Award Activity (Parenthetical) (Detail)	12 Months Ended
	Dec. 31, 2012
Disclosure of Compensation Related Costs, Share-based Payments [Abstract]
Options issued to purchase common stock under Exchange Offer Program	692,682
Options cancelled to purchase common stock under Exchange Offer Program	960,443

Equity_Incentive_Plans_Schedul1

Equity Incentive Plans - Schedule of Additional Information Regarding Company's Stock Options Outstanding and Vested (Detail) (USD $)	12 Months Ended
	Dec. 31, 2014
Share-based Compensation, Shares Authorized under Stock Option Plans, Exercise Price Range [Line Items]
Options Outstanding, Shares	2,319,577
Weighted-Average Remaining Contractual Life (Years)	6 years 9 months 18 days
Weighted-Average Exercise Price per Share	$4.81
Options Vested and Exercisable, Shares	1,629,875
Weighted-Average Exercise Price per Share	$5.27
Exercise Prices $0.91 - $2.17 [Member]
Share-based Compensation, Shares Authorized under Stock Option Plans, Exercise Price Range [Line Items]
Exercise Prices, low end of the range	$0.91
Exercise Prices, high end of the range	$2.17
Options Outstanding, Shares	230,235
Weighted-Average Remaining Contractual Life (Years)	7 years 2 months 12 days
Weighted-Average Exercise Price per Share	$1.66
Options Vested and Exercisable, Shares	136,600
Weighted-Average Exercise Price per Share	$1.64
Exercise Prices $2.18 - $4.33 [Member]
Share-based Compensation, Shares Authorized under Stock Option Plans, Exercise Price Range [Line Items]
Exercise Prices, low end of the range	$2.18
Exercise Prices, high end of the range	$4.33
Options Outstanding, Shares	888,673
Weighted-Average Remaining Contractual Life (Years)	7 years 8 months 12 days
Weighted-Average Exercise Price per Share	$3.44
Options Vested and Exercisable, Shares	530,717
Weighted-Average Exercise Price per Share	$3.44
Exercise Prices $4.34 - $6.50 [Member]
Share-based Compensation, Shares Authorized under Stock Option Plans, Exercise Price Range [Line Items]
Exercise Prices, low end of the range	$4.34
Exercise Prices, high end of the range	$6.50
Options Outstanding, Shares	835,834
Weighted-Average Remaining Contractual Life (Years)	6 years 10 months 24 days
Weighted-Average Exercise Price per Share	$4.83
Options Vested and Exercisable, Shares	604,501
Weighted-Average Exercise Price per Share	$4.84
Exercise Prices $6.51 - $8.67 [Member]
Share-based Compensation, Shares Authorized under Stock Option Plans, Exercise Price Range [Line Items]
Exercise Prices, low end of the range	$6.51
Exercise Prices, high end of the range	$8.67
Options Outstanding, Shares	246,709
Weighted-Average Remaining Contractual Life (Years)	4 years 6 months
Weighted-Average Exercise Price per Share	$7.90
Options Vested and Exercisable, Shares	241,331
Weighted-Average Exercise Price per Share	$7.92
Exercise Prices $8.68 - $19.51 [Member]
Share-based Compensation, Shares Authorized under Stock Option Plans, Exercise Price Range [Line Items]
Exercise Prices, low end of the range	$8.68
Exercise Prices, high end of the range	$19.51
Options Outstanding, Shares	118,126
Weighted-Average Remaining Contractual Life (Years)	3 years 10 months 24 days
Weighted-Average Exercise Price per Share	$14.68
Options Vested and Exercisable, Shares	116,726
Weighted-Average Exercise Price per Share	$14.66

Equity_Incentive_Plans_Additio1

Equity Incentive Plans - Additional Information 1 (Detail) (USD $)	12 Months Ended
	Dec. 31, 2014	Dec. 31, 2013	Dec. 31, 2012	Dec. 31, 2011
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Stock-based compensation expense	$1,300,000	$1,600,000	$3,500,000
Amount withheld to satisfy employees' minimum tax obligation on the vested restricted stock units	971,000	268,000	262,000
Issuance of common stock under the employee stock purchase plan	971,000	786,000	566,000
Shares of common stock available for future issuance	2,401,148	2,232,803	1,752,468	1,312,029
2010 Plan [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Maximum increase in the number of shares reserved for issuance on the first day of each of the company's fiscal years	4.00%
2013 Plan [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Issued	315,000
Released, Number of Restricted Stock Units Outstanding	105,000
Shares of common stock available for future issuance	185,000
Employee Stock Purchase Plan [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Stock-based compensation expense	400,000	500,000	400,000
Purchase price as a percentage of the market value of the common stock over a specified period	85.00%
Maximum increase in the number of shares reserved for issuance on the first day of each of the company's fiscal years	1.00%
Issuance of common stock	344,350	397,080	356,388
Issuance of common stock under the employee stock purchase plan	1,000,000	800,000	600,000
Shares of common stock available for future issuance	115,658
Restricted Stock Awards and Restricted Stock Units [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Stock-based compensation expense	4,000,000	4,400,000	3,600,000
Restricted Stock Awards and Restricted Stock Units [Member] \| Minimum [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Vesting period	3 months
Restricted Stock Awards and Restricted Stock Units [Member] \| Maximum [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Vesting period	4 years
Restricted Stock Units [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Issued	1,632,971	1,764,352	720,259
Released, Number of Restricted Stock Units Outstanding	887,744	624,896	448,327
Intrinsic value restricted stock units vested	3,500,000	2,300,000
Shares withheld to satisfy employees' minimum tax obligation on the vested restricted stock units	245,205	69,577
Amount withheld to satisfy employees' minimum tax obligation on the vested restricted stock units	$1,000,000	$300,000
Restricted Stock Units [Member] \| 2010 Plan [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Issued	1,632,971	1,449,352
Restricted Stock Units [Member] \| 2013 Plan [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Issued		315,000

Equity_Incentive_Plans_Summary2

Equity Incentive Plans - Summary of RSA Activity (Detail) (Restricted Stock Awards [Member], USD $)	12 Months Ended
In Thousands, except Share data, unless otherwise specified	Dec. 31, 2014	Dec. 31, 2013	Dec. 31, 2012
Restricted Stock Awards [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Balance at beginning of period		2,400	3,600
Granted, Number of Restricted Stock Awards Outstanding	0	0	0
Released, Number of Restricted Stock Awards Outstanding		-1,200	-1,200
Forfeited, Number of Restricted Stock Awards Outstanding		-1,200
Balance at end of period			2,400
Balance at beginning of period, Weighted Average Grant Date Fair Value		$13.73	$13.73
Granted, Weighted Average Grant Date Fair Value	$0	$0	$0
Released, Weighted Average Grant Date Fair Value		$13.73	$13.73
Forfeited, Weighted Average Grant Date Fair Value		$13.73
Balance at end of period, Weighted Average Grant Date Fair Value			$13.73
Balance at beginning of period, Aggregate Intrinsic Value		$6	$14
Balance at end of period, Aggregate Intrinsic Value			$6

Equity_Incentive_Plans_Summary3

Equity Incentive Plans - Summary of RSU Activity (Detail) (Restricted Stock Units [Member], USD $)	12 Months Ended
In Thousands, except Share data, unless otherwise specified	Dec. 31, 2014	Dec. 31, 2013	Dec. 31, 2012
Restricted Stock Units [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Balance at beginning of period	1,599,720	809,542	645,685
Granted, Number of Restricted Stock Units Outstanding	1,632,971	1,764,352	720,259
Released, Number of Restricted Stock Units Outstanding	-887,744	-624,896	-448,327
Forfeited, Number of Restricted Stock Units Outstanding	-327,535	-349,278	-108,075
Balance at end of period	2,017,412	1,599,720	809,542
Balance at beginning of period, Weighted Average Grant Date Fair Value	$4.43	$7.32	$12.24
Granted, Weighted Average Grant Date Fair Value	$4.20	$3.91	$3.93
Released, Weighted Average Grant Date Fair Value	$4.64	$5.68	$7.78
Forfeited, Weighted Average Grant Date Fair Value	$4.20	$6.27	$12.26
Balance at end of period, Weighted Average Grant Date Fair Value	$4.13	$4.43	$7.32
Balance at beginning of period, Aggregate Intrinsic Value	$6,895	$2,145	$2,667
Balance at end of period, Aggregate Intrinsic Value	$7,571	$6,895	$2,145

Equity_Incentive_Plans_Schedul2

Equity Incentive Plans - Schedule of Weighted-Average Assumptions Used to Calculate Compensation Expense for ESPP (Detail) (Employee Stock Purchase Plan [Member])	12 Months Ended
	Dec. 31, 2014	Dec. 31, 2013	Dec. 31, 2012
Employee Stock Purchase Plan [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Dividend rate	0.00%	0.00%	0.00%
Risk-free interest rate	0.10%	0.10%	0.20%
Expected life (in years)	9 months 18 days	9 months 18 days	8 months 12 days
Expected volatility	47.30%	84.40%	89.70%

Income_Taxes_Schedule_of_Loss_

Income Taxes - Schedule of Loss Before Provision for Income Taxes (Detail) (USD $)	12 Months Ended
In Thousands, unless otherwise specified	Dec. 31, 2014	Dec. 31, 2013	Dec. 31, 2012
Income Tax Disclosure [Abstract]
Domestic	($22,263)	($13,724)	($32,502)
International	1,903	1,801	1,963
Loss before provision for income taxes	($20,360)	($11,923)	($30,539)

Income_Taxes_Schedule_of_Compo

Income Taxes - Schedule of Components of Provision for Income Taxes (Detail) (USD $)	12 Months Ended
In Thousands, unless otherwise specified	Dec. 31, 2014	Dec. 31, 2013	Dec. 31, 2012
Current
Federal	$0	$0	$0
State	11	-2	25
Foreign	508	445	524
Total current	519	443	549
Deferred
Federal	0	0	0
State	0	0	0
Foreign	0	0	0
Total deferred	0	0	0
Total provision for income taxes	$519	$443	$549

Income_Taxes_Schedule_of_Recon

Income Taxes - Schedule of Reconciliations of Statutory Federal Income Tax to Effective Tax (Detail) (USD $)	12 Months Ended
In Thousands, unless otherwise specified	Dec. 31, 2014	Dec. 31, 2013	Dec. 31, 2012
Income Tax Disclosure [Abstract]
Tax at statutory federal rate	($6,923)	($4,054)	($10,383)
State tax - net of federal benefit	-449	-275	-1,553
Nondeductible expenses	775	790	1,279
Foreign income rate differential	-138	-635	-698
Foreign tax	444	413	486
Credits	-957	-631	-347
Change in state apportionment	83	1,774
Other	547	866	-596
Valuation allowance changes affecting the tax provision	7,137	2,195	12,361
Total provision for income taxes	$519	$443	$549

Income_Taxes_Schedule_of_Net_D

Income Taxes - Schedule of Net Deferred Tax Assets (Detail) (USD $)	Dec. 31, 2014	Dec. 31, 2013
In Thousands, unless otherwise specified	Dec. 31, 2014	Dec. 31, 2013
Deferred tax assets:
Depreciation and amortization	$12,081	$11,298
Accruals and other	14,598	14,876
Research and other credits	6,925	5,968
Net operating loss carryforward	59,541	53,867
Gross deferred tax asset	93,145	86,009
Valuation allowance	-93,145	-86,009
Net deferred tax assets	$0	$0

Income_Taxes_Additional_Inform

Income Taxes - Additional Information (Detail) (USD $)	12 Months Ended
Income Taxes - Additional Information (Detail) (USD $)	Dec. 31, 2014	Dec. 31, 2013	Dec. 31, 2012	Dec. 31, 2011
Tax Credit Carryforward [Line Items]
Increase in valuation allowance	$7,100,000	$2,200,000	$12,400,000
Minimum cumulative change in ownership percentage	50.00%
Additional tax expense	900,000
Unrecognized tax benefits	2,620,000	2,324,000	2,083,000	1,949,000
Unrecognized tax benefits that would impact on effective tax rate	200,000
Federal [Member]
Tax Credit Carryforward [Line Items]
Net operating loss carryforwards	163,800,000
Federal [Member] \| Research [Member]
Tax Credit Carryforward [Line Items]
Amount of credit carryovers	4,500,000
State [Member]
Tax Credit Carryforward [Line Items]
Net operating loss carryforwards	119,900,000
State [Member] \| Research [Member]
Tax Credit Carryforward [Line Items]
Amount of credit carryovers	5,000,000
Foreign [Member]
Tax Credit Carryforward [Line Items]
Amount of credit carryovers	$1,100,000

Income_Taxes_Schedule_of_Recon1

Income Taxes - Schedule of Reconciliation of Beginning and Ending Unrecognized Tax Benefit Amounts (Detail) (USD $)	12 Months Ended
In Thousands, unless otherwise specified	Dec. 31, 2014	Dec. 31, 2013	Dec. 31, 2012
Income Tax Disclosure [Abstract]
Balance at the beginning of the period	$2,324	$2,083	$1,949
Increase related to current period tax positions	296	241	134
Balance at the end of the period	$2,620	$2,324	$2,083

Employee_Benefit_Plan_Addition

Employee Benefit Plan - Additional Information (Detail) (USD $)	12 Months Ended
	Dec. 31, 2014
Compensation and Retirement Disclosure [Abstract]
Contributions to 401(k) Plan	$0

RelatedParty_Transactions_Addi

Related-Party Transactions - Additional Information (Detail) (Reseller [Member], Japan [Member], USD $)	12 Months Ended
	Dec. 31, 2014	Dec. 31, 2013	Dec. 31, 2012
Reseller [Member] \| Japan [Member]
Related Party Transaction [Line Items]
Revenue from related party	$800,000	$600,000	$700,000
Accounts receivable from related party		$5,000

Information_about_Geographic_A2

Information about Geographic Areas - Additional Information (Detail)	12 Months Ended
	Dec. 31, 2014
	Segment
Segment Reporting [Abstract]
Number of business activities	1

Information_about_Geographic_A3

Information about Geographic Areas - Schedule of Revenues and Long-lived Assets by Geographic Area (Detail) (USD $)	12 Months Ended
In Thousands, unless otherwise specified	Dec. 31, 2014	Dec. 31, 2013	Dec. 31, 2012
Revenues from External Customers and Long-Lived Assets [Line Items]
Revenue	$90,891	$105,747	$97,510
Long-lived assets	1,879	2,451
United States [Member]
Revenues from External Customers and Long-Lived Assets [Line Items]
Revenue	43,975	57,961	50,443
Long-lived assets	1,144	1,390
United Kingdom [Member]
Revenues from External Customers and Long-Lived Assets [Line Items]
Revenue	18,539	19,676	21,476
Long-lived assets	13
Rest of EMEA [Member]
Revenues from External Customers and Long-Lived Assets [Line Items]
Revenue	10,702	11,176	11,077
Rest of Americas [Member]
Revenues from External Customers and Long-Lived Assets [Line Items]
Revenue	7,057	7,273	5,373
Asia Pacific [Member]
Revenues from External Customers and Long-Lived Assets [Line Items]
Revenue	10,618	9,661	9,141
India [Member]
Revenues from External Customers and Long-Lived Assets [Line Items]
Long-lived assets	721	1,055
Japan [Member]
Revenues from External Customers and Long-Lived Assets [Line Items]
Long-lived assets	$1	$6

Subsequent_Events_Additional_I

Subsequent Events - Additional Information (Detail) (USD $)	12 Months Ended
In Millions, unless otherwise specified	Dec. 31, 2014	Jan. 09, 2015	Mar. 31, 2015
Subsequent Event [Line Items]
Plan of reorganization, announcement date	6-Jan-15
Subsequent Events [Member]
Subsequent Event [Line Items]
Expected reduction in worldwide headcount, percentage		10.00%
Scenario Forecast [Member] \| Minimum [Member]
Subsequent Event [Line Items]
Estimated restructuring charges			$1.50
Scenario Forecast [Member] \| Maximum [Member]
Subsequent Event [Line Items]
Estimated restructuring charges			$2

Schedule_II_Valuation_and_Qual1

Schedule II - Valuation and Qualifying Accounts (Detail) (USD $)	12 Months Ended
In Thousands, unless otherwise specified	Dec. 31, 2014	Dec. 31, 2013	Dec. 31, 2012
Allowance for Doubtful Accounts:
Beginning balance	$28	$14	$134
Charged to costs and expenses	148	30	44
Recovery of bad debt	-2	-8	-54
Bad debt write-offs	-34	-8	-110
Ending balance	$140	$28	$14