Imprivata 10-K 11 Mar 15 2014 FY Annual report Financial data

Document_and_Entity_Informatio

Document and Entity Information (USD $)	12 Months Ended
In Millions, except Share data, unless otherwise specified	Dec. 31, 2014	Feb. 26, 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	IMPR
Entity Registrant Name	Imprivata Inc
Entity Central Index Key	1328015
Current Fiscal Year End Date	-19
Entity Well-known Seasoned Issuer	No
Entity Current Reporting Status	Yes
Entity Voluntary Filers	No
Entity Filer Category	Non-accelerated Filer
Entity Common Stock, Shares Outstanding		23,882,786
Entity Public Float			$144.50

Consolidated_Balance_Sheets

Consolidated Balance Sheets (USD $)	Dec. 31, 2014	Dec. 31, 2013
In Thousands, unless otherwise specified
Current assets:
Cash and cash equivalents	$78,524	$13,284
Accounts receivable, net of allowances	25,335	19,754
Prepaid expenses and other current assets	3,516	2,541
Total current assets	107,375	35,579
Property and equipment, net	7,640	6,682
Goodwill	1,560	1,560
Intangible assets, net	1,499	2,000
Other assets	105	649
Total assets	118,179	46,470
Current liabilities:
Accounts payable	2,498	3,586
Accrued expenses and other current liabilities	10,565	9,149
Current portion of capital lease obligations and long-term debt	625	313
Current portion of other long-term liabilities	288	249
Current portion of deferred revenue	33,120	25,084
Current portion of contingent purchase price liability	152
Total current liabilities	47,248	38,381
Deferred revenue, net of current portion	4,021	3,490
Capital lease obligations, long-term debt and royalty obligations, net of current portion	619	410
Other long-term liabilities, net of current portion	1,535	1,181
Contingent purchase price liability, net of current portion	480	1,008
Total liabilities	53,903	44,470
Commitments and contingencies (Note 10)
Redeemable convertible preferred stock, $0.001 par value, 0 and 20,956,426 shares authorized, issued and outstanding at December 31, 2014 and 2013, respectively		91,607
Stockholders' equity (deficit):
Undesignated preferred stock, $0.001 par value, 20,000,000 shares authorized;none issued at December 31, 2014
Common stock, $0.001 par value, 250,000,000 and 32,867,000 shares authorized at December 31, 2014 and 2013, respectively; 23,742,467, and 3,588,234, shares issued and outstanding at December 31, 2014 and 2013	24	4
Additional paid-in capital	171,903
Accumulated other comprehensive loss	-100	-145
Accumulated deficit	-107,551	-89,466
Total stockholders' equity (deficit)	64,276	-89,607
Total Liabilities, redeemable convertible preferred stock and stockholders' equity (deficit)	118,179	46,470
Redeemable Convertible Preferred Stock [Member]
Current liabilities:
Redeemable convertible preferred stock, $0.001 par value, 0 and 20,956,426 shares authorized, issued and outstanding at December 31, 2014 and 2013, respectively		$91,607

Consolidated_Balance_Sheets_Pa

Consolidated Balance Sheets (Parenthetical) (USD $)	Dec. 31, 2014	Dec. 31, 2013
Redeemable convertible preferred stock, outstanding		20,956,000
Undesignated preferred stock, par value	$0.00
Undesignated preferred stock, authorized	20,000,000	20,956,426
Undesignated preferred stock, issued	0	20,956,426
Common stock, par value	$0.00	$0.00
Common stock, authorized	250,000,000	32,867,000
Common stock, issued	23,742,467	3,588,234
Common stock, outstanding	23,742,467	3,588,234
Redeemable Convertible Preferred Stock [Member]
Redeemable convertible preferred stock, par value	$0.00	$0.00
Redeemable convertible preferred stock, authorized	0	20,956,426
Redeemable convertible preferred stock, issued	0	20,956,426
Redeemable convertible preferred stock, outstanding	0	20,956,426

Consolidated_Statements_of_Ope

Consolidated Statements of Operations (USD $)	12 Months Ended
In Thousands, except Per Share data, unless otherwise specified	Dec. 31, 2014	Dec. 31, 2013	Dec. 31, 2012
Revenue
Product	$52,164	$39,124	$29,992
Maintenance and services	44,815	31,987	24,032
Total revenue	96,979	71,111	54,024
Cost of Revenue
Product	12,310	7,849	6,855
Maintenance and services	17,678	11,020	6,563
Total cost of revenue	29,988	18,869	13,418
Gross Profit	66,991	52,242	40,606
Operating expenses
Research and development	25,781	19,609	12,322
Sales and marketing	45,003	30,538	22,473
General and administrative	12,052	7,619	4,564
Total operating expenses	82,836	57,766	39,359
(Loss) income from operations	-15,845	-5,524	1,247
Other income (expense)
Foreign currency exchange (loss) gain	-576	229	-77
Interest and other expense, net	-146	-120	-13
(Loss) income before income taxes	-16,567	-5,415	1,157
Income taxes	169	108	109
(Loss) net income	-16,736	-5,523	1,048
Accretion of redeemable convertible preferred stock	-2,442	-4,952	-4,957
Net loss attributable to common stockholders	($19,178)	($10,475)	($3,909)
Net loss per share attributable to common stockholders
Basic and diluted	($1.37)	($3.12)	($1.36)
Weighted average common shares outstanding used in computing net loss per share attributable to common stockholders
Basic and diluted	13,950	3,359	2,868

Consolidated_Statements_of_Com

Consolidated Statements of Comprehensive (Loss) Income (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) income	($16,736)	($5,523)	$1,048
Other comprehensive income (loss):
Foreign currency translation adjustments	45	-103	144
Comprehensive (loss) income	($16,691)	($5,626)	$1,192

Consolidated_Statement_of_Stoc

Consolidated Statement of Stockholders' Equity (Deficit) (USD $)	Total	Common Stock [Member]	Additional Paid-in Capital [Member]	Accumulated Other Comprehensive Income (Loss) [Member]	Accumulated Deficit [Member]
Beginning balance at Dec. 31, 2011	($77,431,000)	$3,000		($186,000)	($77,248,000)
Beginning balance, Shares at Dec. 31, 2011		2,682,000
Accretion of redeemable convertible preferred stock to redemption value	-4,957,000		-886,000		-4,071,000
Exercise of common stock options	436,000		436,000
Exercise of common stock options, Shares		438,000
Stock-based compensation expense	450,000		450,000
Net income	1,048,000				1,048,000
Other comprehensive income (loss)	144,000			144,000
Ending balance at Dec. 31, 2012	-80,310,000	3,000		-42,000	-80,271,000
Ending balance, Shares at Dec. 31, 2012		3,120,000
Accretion of redeemable convertible preferred stock to redemption value	-4,952,000		-1,280,000		-3,672,000
Exercise of common stock options	641,000	1,000	640,000
Exercise of common stock options, Shares	530,000	468,000
Stock-based compensation expense	640,000		640,000
Net income	-5,523,000				-5,523,000
Other comprehensive income (loss)	-103,000			-103,000
Ending balance at Dec. 31, 2013	-89,607,000	4,000		-145,000	-89,466,000
Ending balance, Shares at Dec. 31, 2013		3,588,000
Accretion of redeemable convertible preferred stock to redemption value	-2,442,000	0	-1,093,000		-1,349,000
Exercise of common stock options	567,000		567,000
Exercise of common stock options, Shares	302,000	324,000
Exercise of warrants, net	0	0	0	0	0
Exercise of warrants, net, Shares		109,000
Stock-based compensation expense	1,612,000	0	1,612,000
Issuance of common stock in connection with initial public offering, net of issuance costs	76,788,000	6,000	76,782,000
Issuance of common stock in connection with initial public offering, net of issuance costs, Shares		5,750,000
Conversion of redeemable convertible preferred stock into common stock	94,049,000	14,000	94,035,000
Conversion of redeemable convertible preferred stock into common stock, Shares	20,956,000	13,971,000
Net income	-16,736,000				-16,736,000
Other comprehensive income (loss)	45,000			45,000
Ending balance at Dec. 31, 2014	$64,276,000	$24,000	$171,903,000	($100,000)	($107,551,000)
Ending balance, Shares at Dec. 31, 2014		23,742,000

Consolidated_Statement_of_Stoc1

Consolidated Statement of Stockholders' Equity (Deficit) (Parenthetical) (USD $)	12 Months Ended
In Thousands, except Per Share data, unless otherwise specified	Dec. 31, 2014
Statement of Stockholders' Equity [Abstract]
Issuance costs	$3,425
Common stock, par value	$0.00

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 income (loss)	($16,736)	($5,523)	$1,048
Adjustments to reconcile net income (loss) to net cash used in operating activities:
Depreciation and amortization expense	3,075	2,397	1,082
Provision for doubtful accounts and sales allowance	99	61	84
Stock-based compensation	1,612	640	450
Loss on disposal of fixed assets	75	80	16
Change in value of contingent purchase price liability	-376	-877	-431
Changes in operating assets and liabilities
Accounts receivable	-5,680	-3,248	-5,534
Prepaid expenses and other current assets	-593	-1,124	-658
Other assets	-7	-6	-48
Deferred revenue	8,567	6,818	5,715
Accounts payable	-1,010	47	2,087
Accrued expenses and other current liabilities	2,689	1,836	592
Other liabilities	185	-353	1,679
Net cash (used in) provided by operating activities	-8,100	748	6,082
Cash flows from investing activities:
Purchases of property and equipment	-3,187	-3,413	-4,191
Restricted cash		97
Net cash used in investing activities	-3,187	-3,316	-4,191
Cash flows from financing activities:
Proceeds from initial public offering, net of underwriting discounts and commissions	80,213
Deferred offering costs	-3,405	-20
Repayments for capital lease obligations, long-term debt and other	-674	-317	-138
Increase in long-term debt			326
Proceeds from exercise of stock options	476	916	436
Net cash provided by financing activities	76,610	579	624
Effect of exchange rates on cash and cash equivalents	-83	-137	217
Net increase (decrease) in cash and cash equivalents	65,240	-2,126	2,732
Cash and cash equivalents, beginning of year	13,284	15,410	12,678
Cash and cash equivalents, end of year	78,524	13,284	15,410
Supplemental cash flow data
Interest paid in cash	107	51	7
Taxes paid in cash	106	156	123
Supplemental disclosures of non-cash investing and financing activities
Equipment purchases under capital leases	714	114	693
Property and equipment purchases included in accounts payable and accrued expenses	120	56	1,027
Accretion of preferred stock	$2,442	$4,952	$4,957

Organization_and_Business

Organization and Business	12 Months Ended
	Dec. 31, 2014
Accounting Policies [Abstract]
Organization and Business	1. Organization and business
	(a) Nature of business
	Imprivata, Inc. (the “Company”) provides authentication and access management technology solutions primarily for the healthcare industry. The Company’s flagship product Imprivata OneSign, is an integrated enterprise single sign-on, authentication management and workflow automation platform that addresses multiple security and productivity challenges faced by hospitals and other healthcare organizations. By enabling fast, secure access to healthcare information technology systems, the Company believes that its solutions save clinicians significant time to focus on patient care, increase their productivity and satisfaction, and help healthcare organizations comply with privacy and security regulations.
	The Company was incorporated in the State of Delaware in May 2001.
	On June 30, 2014, the Company completed its initial public offering (“IPO”) and is listed on the New York Stock Exchange (“NYSE”) under the ticker symbol IMPR.
	(b) Basis of presentation and principles of consolidation
	The accompanying consolidated financial statements have been prepared in accordance with accounting principles generally accepted in the United States of America (“U.S. GAAP”). The Company is subject to a number of risks. Principal among these risks are dependence on key individuals, competition from substitute products and larger companies, the successful development and marketing of its products, and recruitment of key personnel.
	Management believes the Company has sufficient cash and availability under its letter of credit to sustain operations through at least the next 12 months.
	The consolidated financial statements include the accounts of the Company and its wholly owned subsidiaries, Imprivata Securities Corporation and Imprivata International Limited, and its wholly owned subsidiary Imprivata UK Limited. All intercompany balances and transactions have been eliminated in consolidation.
	(c) Use of estimates
	The preparation of the Company’s consolidated financial statements in conformity with U.S. GAAP requires management to make estimates and assumptions that affect the reported amounts of assets and liabilities and disclosure of contingent assets and liabilities at the date of the financial statements and the reported amounts of revenue and expenses during the reporting period. Actual results could differ materially from the Company’s estimates. To the extent that there are material differences between these estimates and actual results, the Company’s financial condition or operating results will be affected. The Company bases its estimates on past experience and other assumptions that the Company believes are reasonable under the circumstances, and the Company evaluates these estimates on an ongoing basis. The most significant estimates relate to the timing and amounts of revenue recognized, deferred tax valuation allowances, valuation of contingent consideration, warranty obligations, uncollectible accounts and stock-based compensation.
	(d) Foreign currency
	The Company’s wholly owned subsidiary, Imprivata International, Inc., had one subsidiary (Imprivata UK Limited) and four branches operational during 2013. In the first quarter of 2014, the Company completed the closure of its UK branch. The subsidiary and branches use the local currency as the functional currency. The Company translates the assets and liabilities of its foreign operations into U.S. dollars based on the rates of exchange in effect as of the balance sheet date. Revenues and expenses are translated into U.S. dollars using average exchange rates for each period. The resulting adjustments from the translation process are included in accumulated other comprehensive (loss) income in the accompanying consolidated balance sheets.
	Certain transactions of the Company are settled in foreign currency, and are thus translated to U.S. dollars at the rate of exchange in effect at the end of each month. Gains (losses) resulting from the translation are included in foreign exchange gains (losses) in the accompanying consolidated statements of operations.

Summary_of_Significant_Account

Summary of Significant Accounting Policies	12 Months Ended
	Dec. 31, 2014
Accounting Policies [Abstract]
Summary of Significant Accounting Policies	2. Summary of significant accounting policies
	The accompanying consolidated financial statements reflect the application of certain significant accounting policies as described in this note and elsewhere in the footnotes.
	(a) Cash, cash equivalents and restricted cash
	Cash and cash equivalents
	The Company considers all highly liquid investments with a remaining maturity of 90 days or less at the date of purchase to be cash and cash equivalents. Cash and cash equivalents consist principally of deposit accounts and money market accounts at December 31, 2014, 2013 and 2012.
	Restricted cash
	During 2013, the Company was informed by the bank holding the LOC that the certificate of deposit was no longer required as collateral for the LOC. The certificate of deposit has been reclassified to cash and cash equivalents in the accompanying consolidated balance sheets and in the cash used in investing activities in the accompanying consolidated statements of cash flows as of December 31, 2013.
	(b) Reserve accounts
	Allowance for doubtful accounts and sales returns
	The allowance for doubtful accounts and sales returns is the Company’s best estimate of the amount of probable credit losses and returns in the Company’s existing accounts receivable. The Company determines the allowance for doubtful accounts and sales returns based on analysis of historical bad debts, customer concentrations, customer creditworthiness, credit history, return history and current economic trends. The Company reviews its allowances for doubtful accounts and sales returns quarterly. Past due balances over 90 days and specified other balances are reviewed individually for collectability. All other balances are reviewed on an aggregate basis. Account balances are written off against the allowance after all means of collection have been exhausted and the potential for recovery is considered remote. The Company does not sell its software with a right of return; however, the Company allows returns of hardware products in limited circumstances, primarily related to changes in configuration requirements. Significant judgments and estimates are made and used in connection with establishing allowances for doubtful accounts and sales returns in any accounting period and actual results may differ from these judgments and estimates. No significant differences from estimates have been experienced. The Company records adjustments to the allowance for doubtful accounts to general and administrative expense and adjustments to the allowance for sales returns as a reduction of revenue.
	Warranty reserves
	The Company maintains an allowance for warranty obligations that may be incurred under its limited warranty, which includes a hardware warranty of one year. Factors that affect the Company’s allowance for warranty obligations include the number of installed units currently under warranty, historical and anticipated rates of warranty claims on those units, and the cost per claim to satisfy the Company’s warranty obligation.
	(c) Property and equipment
	Property and equipment are recorded at cost. Depreciation and amortization are computed using the straight-line method over the estimated useful lives of the assets, which are three years. Leasehold improvements are amortized over the lesser of the term of the lease or the useful life of the asset. Repairs and maintenance costs are expensed as incurred, whereas major improvements are capitalized as additions to property and equipment.
	(d) Business combinations
	The Company allocates the fair value of the purchase consideration of its acquisitions to the tangible assets, liabilities, and intangible assets acquired, including in-process research and development (“IPR&D”), based on their estimated fair values. The excess of the fair value of purchase consideration over the fair values of these identifiable assets and liabilities is recorded as goodwill. IPR&D is initially capitalized at fair value as an intangible asset with an indefinite life and assessed for impairment thereafter. When a project underlying reported IPR&D is completed, the corresponding amount of IPR&D is reclassified as an amortizable purchased intangible asset and is amortized over the asset’s estimated useful life. Acquisition-related expenses are expensed as incurred.
	The allocation of the purchase price requires management to make significant estimates in determining the fair values of assets acquired and liabilities assumed, especially with respect to intangible assets. These estimates are based on information obtained from management of the acquired companies and historical experience. These estimates can include, but are not limited to, the cash flows that an asset is expected to generate in the future, and the cost savings expected to be derived from acquiring an asset. These estimates are inherently uncertain and unpredictable, and if different estimates were used, the purchase price for the acquisition could be allocated to the acquired assets and liabilities differently from the allocation that the Company has made. In addition, unanticipated events and circumstances may occur which may affect the accuracy or validity of such estimates. If such events occur, the Company may be required to record a charge against the value ascribed to an acquired asset or an increase in the amounts recorded for assumed liabilities.
	(e) Goodwill and purchased intangible assets
	Goodwill and purchased intangible assets with indefinite lives are not amortized, but tested for impairment on an annual basis in the fourth quarter and more frequently if events or changes in circumstances indicate that the asset may be impaired. The Company’s impairment tests are based on a single operating segment and reporting unit structure.
	In order to determine if Goodwill is impaired, a test is performed. The test involves a two-step process. The first step involves comparing the fair value of the Company’s reporting unit to its carrying value, including goodwill. If the carrying value of the reporting unit exceeds its fair value, the second step of the test is performed by comparing the carrying value of the goodwill in the reporting unit to its implied fair value. An impairment charge is recognized for the excess of the carrying value of goodwill over its implied fair value. There have been no impairment charges recorded.
	In order to determine if indefinite-lived intangible assets are impaired, the Company first performs a qualitative assessment to determine whether it is more likely than not that the asset may be impaired. If the qualitative assessment determines that it is more likely than not that an indefinite-lived intangible asset may be impaired, the quantitative impairment test is performed. The quantitative impairment test for an indefinite-lived intangible asset compares the fair value of the asset with its carrying amount. If the carrying amount of an intangible asset exceeds its fair value, an impairment loss is recognized for the excess. After an impairment loss is recognized, the carrying amount of the intangible asset is adjusted.
	Finite-lived intangible assets are carried at cost and amortized on a straight-line basis over their estimated useful lives, which is four to twelve years. The Company evaluates finite lived intangible assets for impairment by assessing the recoverability of these assets whenever adverse events or changes in circumstances or business climate indicate that expected undiscounted future cash flows related to such intangible assets may not be sufficient to support the net book value of such assets. An impairment charge is recognized in the period of identification to the extent the carrying amount of an asset exceeds the fair value of such asset.
	Significant judgments required in assessing the impairment of goodwill and intangible assets include the identification of reporting units, identifying whether events or changes in circumstances require an impairment assessment, estimating future cash flows, determining appropriate discount and growth rates and other assumptions. Changes in these estimates and assumptions could materially affect the determination of fair value as to whether an impairment exists and, if so, the amount of that impairment.
	(f) Long-lived assets
	Long-lived assets that are held and used by the Company are reviewed for impairment whenever events or changes in circumstances indicate that the carrying amount of the asset may not be recoverable. When such events occur, the Company compares the carrying amounts of the assets to their undiscounted expected future cash flows. If this comparison indicates that there is impairment, the amount of the impairment is determined as the difference between the carrying value and fair value.
	(g) Deferred offering costs
	The Company incurred approximately $3.4 million in costs related to its initial public offering. These offering expenses have been recorded as a reduction of the proceeds received on June 30, 2014, the closing of the Company’s IPO. There are deferred offering costs for the year ended December 31, 2013 of $532,000 included in Other assets in the accompanying balance sheet.
	(h) Revenue recognition
	The Company derives its revenue primarily from the licensing of software, as well as devices, maintenance and services. Revenue is recognized when persuasive evidence of an arrangement exists, delivery has occurred, the fee is fixed or determinable, and collection is considered probable. Product revenue is recognized upon shipment, assuming all other revenue recognition criteria have been met. Services are considered delivered as the work is performed and maintenance is considered delivered over the contractual maintenance term. The Company has a limited number of customers who purchase our software on a term basis and recognizes these sales ratably over the term.
	Sales of the Company’s software that are sold through resellers are recognized as revenue based on the same criteria as direct sales and upon identification of the end user. For sales through resellers, the reseller assumes the risk of collection from the end user and the Company does not offer a right of return or price protection to any of its resellers.
	When arrangements contain software and non-software elements, the Company allocates the arrangement consideration to the software and non-software elements. The fair value of the elements is determined utilizing vendor-specific objective evidence of fair value, or VSOE, when available, third party evidence or the best estimate of selling price when VSOE of fair value is not determinable. The Company is currently unable to establish VSOE of fair value or third party evidence for our software elements as a group. Therefore the best estimate of selling price for the software elements is determined by considering various factors including but not limited to the Company’s standard software maintenance rates, the historical selling price of these deliverables in similar transactions, and its standard pricing practices along with geographies and customer class. After determining fair value for each deliverable, the arrangement consideration is allocated between the software elements, as a group, and the non-software elements using the relative selling price method. The non-software elements are then recognized upon delivery and when all other revenue recognition criteria are met.
	For software arrangements or elements that contain multiple deliverables where VSOE of fair value exists for all undelivered elements such as maintenance and services, the Company recognizes revenue for the delivered elements using the residual method. VSOE of fair value is determined based upon the price charged when the same element is sold separately. VSOE of fair value of maintenance on user based licenses is based on the price customers are charged when they purchase maintenance separately from other products. Separate sales of maintenance occur when customers make the decision to renew their contracts in years subsequent to the initial maintenance term. The Company analyzes its separate sales based on the “bell-shaped” curve method to ensure that the separate sales are sufficiently concentrated around a specific point and within a narrow enough range to enable a reasonable estimate of fair value. VSOE of fair value of maintenance on enterprise licenses is based on separately stated renewal rates in the arrangement that are substantive.
	For software arrangements containing multiple deliverables where VSOE of fair value does not exist for all undelivered elements, the Company defers revenue for the delivered and undelivered elements until VSOE of fair value is established for the entire undelivered element or all of the elements have been delivered, unless the only undelivered element is delivered over time (e.g., maintenance) where it would record revenue ratably over the delivery period. The Company recognizes maintenance ratably over the term of the maintenance contract, generally 12 months. The Company recognizes revenue allocated to professional service elements, such as installation and training, as the services are performed based on VSOE of fair value for each service performed.
	(i) Deferred cost of goods sold
	Deferred costs of goods sold consist primarily of costs associated with physical appliances and devices that were shipped during the period for which the revenue recognition criteria have not yet been met. Deferred costs of goods sold were $78,000 and $459,000 for the years ended December 31, 2014 and 2013, respectively. The costs will be amortized to expense in conjunction with the recognition of the related deferred revenue. These costs are included in prepaid expenses and other current assets on the accompanying balance sheet.
	(j) Research and development and software development costs
	Research and development expenses consist primarily of salary and related expenses for the Company’s research and development staff, including benefits, bonuses and stock-based compensation; the cost of certain third-party contractor costs; and allocated overhead. Expenditures for research and development are expensed as incurred.
	Costs associated with the development of computer software for external sale are expensed prior to the establishment of technological feasibility of the software and capitalized thereafter until commercial release of the software. The Company has not historically incurred significant development costs after the establishment of technological feasibility, and as a result, no software development costs have been capitalized to date.
	(k) Shipping and handling costs
	Shipping and handling costs charged to customers are included in revenue and the associated expense is recorded in cost of products sold in the statements of operations for all periods presented.
	(l) Advertising costs
	Advertising costs are included in sales and marketing expense and are expensed as incurred. Advertising expenses were $194,000, $170,000 and $173,000 for the years ended December 31, 2014, 2013 and 2012, respectively.
	(m) Income taxes
	The Company uses the asset and liability method for accounting for income taxes. Under this method, deferred tax assets and liabilities are recorded based on differences between the financial reporting and tax bases of assets and liabilities and for loss and credit carryforwards. The Company measures deferred tax asset and liabilities using the enacted tax rates and laws that will be in effect when the Company expects the differences to reverse. The Company records a valuation allowance to reduce its deferred tax assets to the amount that is more likely than not to be realized. The Company reviews its deferred tax assets for recoverability with consideration for such factors as historical losses, projected future taxable income, prudent and feasible tax planning strategies and the expected timing of the reversals of existing temporary differences. The Company maintains a full valuation allowance against its U.S. net deferred tax assets as a result of the uncertainty regarding the realization of these assets in the future.
	The Company accounts for uncertain tax positions recognized in the consolidated financial statements by prescribing a more-likely-than-not threshold for financial statement recognition and measurement. Interest and penalties associated with such uncertain tax positions are classified as a component of income tax expense. The Company does not have any material unrecognized tax benefits or accrued interest and penalties at December 30, 2014, 2013 or 2012.
	(n) Stock-based compensation
	The Company measures compensation cost for equity awards at their fair value. The measurement date for stock awards granted to employees is generally the date of grant. The measurement date for nonemployee awards is the date services are completed or the award is earned. Stock-based compensation is recognized on a straight-line basis over the requisite service period, which generally is the vesting period. The estimation of stock awards that will ultimately vest requires judgment and to the extent that actual results or updated estimates differ from current estimates, such amounts will be recorded as a cumulative adjustment in the period during which estimates are revised. Actual results and future changes in estimates may differ substantially from current estimates. See Note 13 “Stock Award Plans and Stock-based Compensation” for discussion of the Company’s key assumptions included in determining the fair value of its equity awards at grant date.
	(o) Recent accounting guidance
	Accounting standards or updates recently adopted
	Effective January 1, 2014, the Company adopted Accounting Standards Update (“ASU”) No. 2013-11, “Presentation of a Liability for an Unrecognized Tax Benefit When a Net Operating Loss or Tax Credit”. The new guidance provides that a liability related to an unrecognized tax benefit would be presented as a reduction of a deferred tax asset for a net operating loss carryforward, a similar tax loss or a tax credit carryforward if such settlement is required or expected in the event the uncertain tax position is disallowed. The adoption of this update did not have a significant impact on the Company’s consolidated financial statements, as it required only enhanced disclosures.
	Accounting standards or updates not yet effective
	In May 2014, the Financial Accounting Standards Board (“FASB”) issued ASU No. 2014-09, “Revenue from Contracts with Customers” (Topic 606) (ASU 2014-09). ASU 2014-09 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. This new guidance is effective for annual reporting periods (including interim reporting periods within those periods) beginning after December 15, 2016; early adoption is not permitted. Entities have the option of using either a full retrospective or a modified approach to adopt the guidance. This update could impact the timing and amounts of revenue recognized. The Company is currently evaluating the effect that implementation of this update will have on its consolidated financial position and results of operations upon adoption.

Fair_Value_Measurements

Fair Value Measurements	12 Months Ended
	Dec. 31, 2014
Fair Value Disclosures [Abstract]
Fair Value Measurements	3. Fair value measurements
	Fair value is defined as the exchange price that would be received for an asset or paid to transfer a liability (an exit price) in the principal or most advantageous market for the asset or liability in an orderly transaction between market participants on the measurement date.
	(a) Fair value hierarchy
	The accounting guidance for fair value measurement requires an entity to maximize the use of observable inputs and minimize the use of unobservable inputs when measuring fair value. The standard establishes a fair value hierarchy based on the level of independent, objective evidence surrounding the inputs used to measure fair value. A financial instrument’s categorization within the fair value hierarchy is based upon the lowest level of input that is significant to the fair value measurement. The fair value hierarchy is as follows:
	Level 1 applies to assets or liabilities for which there are quoted prices in active markets for identical assets or liabilities.
	Level 2 applies to assets or liabilities for which there are inputs other than quoted prices that are observable for the asset or liability, such as quoted prices for similar assets or liabilities in active markets; quoted prices for identical assets or liabilities in markets with insufficient volume or infrequent transactions (less active markets); or model-derived valuations in which significant inputs are observable or can be derived principally from, or corroborated by, observable market data.
	Level 3 applies to assets or liabilities for which there are unobservable inputs to the valuation methodology that are significant to the measurement of the fair value of the assets or liabilities.
	(b) Assets and liabilities measured at fair value on a recurring basis
	The Company’s cash equivalents consist of money market funds recorded at cost, which approximates fair value measured based on quoted prices for assets traded in active markets. The contingent consideration liability is recorded at fair value determined using a probability weighted discounted cash flow model primarily based upon future revenue projections.
	The following table sets forth the Company’s assets and liabilities which are measured at fair value on a recurring basis by level within the fair value hierarchy:
			December 31, 2014 fair value measurements
	(in thousands)		Level 1			Level 2			Level 3			Total carrying
												value
	Assets
	Cash equivalents:
	Money and market funds		$	33,184								$	33,184
	Certificates of deposit						97						97
	Liabilities
	Contingent consideration									632			632
			December 31, 2013 fair value measurements
	(in thousands)		Level 1			Level 2			Level 3			Total carrying
												value
	Assets
	Cash equivalents:
	Money and market funds		$	8,478								$	8,478
	Certificates of deposit						97						97
	Liabilities
	Contingent consideration			—			—			1,008			1,008
	(c) Assets and liabilities measured on a non-recurring basis
	There were no fair value measurements on a non-recurring basis as of December 31, 2014, 2013 and 2012.
	(d) Level 3 fair value measurements
	The contingent liability associated with the acquisition of Validus is based on an earn-out capped at $9.8 million, to be paid based on revenue generated using the purchased intellectual property.
	The Company re-measures the fair value of the contingent liability at each balance sheet date based on the present value of forecasted revenues through December 31, 2016. The changes in the fair value are primarily due to the difference in actual revenue earned to date versus the initial projections and revisions to the timing and amount of forecasted future revenues.
	The resulting forecasted revenues were then discounted using a rate that reflects the uncertainty surrounding the expected outcomes, which the Company believes is appropriate and representative of a market participant assumption.
	The following table presents a reconciliation of the contingent liability measured at fair value using significant unobservable inputs, and the revaluation amount recorded in the Company’s consolidated statements of operations as a result of the change in fair value:
			Year ended December 31,
	(in thousands)		2014			2013
	Beginning balance		$	1,008		$	1,885
	Revaluation recognized in general and administrative expenses in the corresponding statements of operations			(376	)		(877	)
	Ending balance		$	632		$	1,008
	This following table presents the significant unobservable inputs used in the valuation of the contingent liability:
			Year ended December 31,
			2014			2013			2012
	Discount Rate			17	%		17%-23%(1)			23	%
	-1	The weighted-average discount rate for the year ended December 31, 2013 was 20%
	(e) Other financial instruments
	The carrying amounts reflected in the consolidated balance sheets for cash and cash equivalents (which are comprised primarily of deposit accounts), accounts receivable, prepaid expenses and other current assets, accounts payable and accrued expenses approximate fair value due to their short-term maturities.

Trade_Accounts_Receivable_Net_

Trade Accounts Receivable, Net of Allowances	12 Months Ended
	Dec. 31, 2014
Receivables [Abstract]
Trade Accounts Receivable, Net of Allowances	4. Trade accounts receivable, net of allowances
	Accounts receivable represent trade receivables from customers when the Company has invoiced for product, maintenance and/or professional services and it has not yet received payment.
	The following table presents the Company’s trade accounts receivable, net:
		December 31,
	(in thousands)	2014			2013
	Trade accounts receivable	$	25,695		$	20,015
	Allowance for doubtful accounts		(161	)		(161	)
	Allowance for sales returns		(199	)		(100	)
	Total allowance		(360	)		(261	)
	Trade accounts receivable, net	$	25,335		$	19,754
	The allowances for doubtful accounts and credit memos are summarized as follows:
	(in thousands)	Balance at			Increases			Balance at
		beginning			in reserves			end of period
		of period
	Allowance for doubtful accounts
	Year ended December 31, 2014	$	161			—		$	161
	Year ended December 31, 2013	$	100			61		$	161
	Year ended December 31, 2012	$	16			84		$	100
	(in thousands)	Balance at			Increase			Write-off /			Balance at
		beginning			in reserves			adjustments			end of period
		of period
	Allowance for sales returns
	Year ended December 31, 2014	$	100			99			—		$	199
	Year ended December 31, 2013	$	100			53			(53	)	$	100
	Year ended December 31, 2012	$	—			100			—		$	100

Property_and_Equipment

Property and Equipment	12 Months Ended
	Dec. 31, 2014
Property, Plant and Equipment [Abstract]
Property and Equipment	5. Property and equipment
	Property and equipment are stated at cost and depreciated using the straight-line method over the estimated useful lives of the related assets or in case of leasehold improvements the shorter of the asset life or lease term. Expenditures for maintenance and repairs are charged to expense as incurred, whereas major improvements are capitalized as additions to property and equipment.
	Property and equipment consisted of the following:
		Estimated
		useful life		December 31,
	(in thousands)	(years)		2014			2013
	Computer equipment an purchased software		3	$	4,397		$	3,525
	Furniture and fixtures		3		2,440			1,637
	Leasehold improvements		Shorter of		5,357			4,119
			useful life or
			lease term
	Construction in progress		—		—			243
	Total				12,194			9,524
	Less accumulated depreciation				(4,554	)		(2,842	)
	Property and equipment, net			$	7,640		$	6,682
	Depreciation expense for the years ended December 31, 2014, 2013 and 2012 was $2.6 million, $1.9 million and $645,000, respectively.

Goodwill_and_Purchased_Intangi

Goodwill and Purchased Intangible Assets	12 Months Ended
	Dec. 31, 2014
Goodwill and Intangible Assets Disclosure [Abstract]
Goodwill and Purchased Intangible Assets	6. Goodwill and purchased intangible assets
	(a) Goodwill
	The Company had $1.6 million of goodwill associated with the Validus Medical Systems, Inc. (“Validus”) acquisition at December 31, 2014 and 2013.
	The Company’s annual impairment test for goodwill resulted in no impairment charges during the years ended December 31, 2014, 2013 and 2012. The Company performs its annual impairment test during the fourth quarter of the fiscal year.
	(b) Purchased intangible assets
	The following table present details of the Company’s intangible assets acquired through business combinations:
	(in thousands)	Gross		Accumulated			Net
				amortization
	December 31, 2014
	Purchased intangible assets with finite lives:
	Intellectual Property	$	3,854	$	(2,374	)	$	1,480
	Trade Name		27		(8	)		19
	Total		3,881		(2,382	)		1,499
	December 31, 2013
	Purchased intangible assets with finite lives:
	Intellectual Property	$	3,854	$	(1,876	)	$	1,978
	Trade Name		27		(5	)		22
	Total	$	3,881	$	(1,881	)	$	2,000
	The following table presents the amortization expense of purchased intangible assets:
		Year ended, December 31,
	(in thousands)	2014		2013			2012
	Amortization of purchased intangible assets
	Cost of sales	$	223	$	242		$	159
	Operating expenses:
	General and administrative		278		279			279
	Total	$	501	$	521		$	438
	The estimated future amortization expense of purchased intangible assets with finite lives as of December 31, 2014 is as follows:
	(in thousands)	Amount
	2015	$	370
	2016		370
	2017		370
	2018		230
	2019		91
	2020		68
	Total	$	1,499
	No impairment charges for finite or indefinite-lived purchased intangible assets were recorded during 2014, 2013 or 2014.

Accrued_Expenses_and_Other_Cur

Accrued Expenses and Other Current Liabilities	12 Months Ended
	Dec. 31, 2014
Payables and Accruals [Abstract]
Accrued Expenses and Other Current Liabilities	7. Accrued expenses and other current liabilities
	The following table presents the details of the Company’s accrued expenses and other current liabilities:
			December 31,
	(in thousands)		2014		2013
	Accrued payroll and related		$	7,839	$	5,442
	Accrued taxes(1)			1,144		783
	Other accrued expenses			1,582		2,924
			$	10,565	$	9,149
	-1	Accrued taxes consist of accruals for foreign and state taxes, sales and use taxes, value added taxes due in foreign jurisdictions and franchise taxes.

Warranty_Obligations

Warranty Obligations	12 Months Ended
	Dec. 31, 2014
Guarantees [Abstract]
Warranty Obligations	8. Warranty obligations
	The Company maintains an allowance for warranty obligations that may be incurred under its limited warranty. Factors that affect the Company’s allowance for warranty obligations include the number of installed units currently under warranty, historical and anticipated rates of warranty claims on those units, and the cost per claim to satisfy the Company’s warranty obligation.
	The following table presents the details of the Company’s allowance for warranty obligations:
		December 31,
	(in thousands)	2014			2013
	Beginning balance	$	93		$	93
	Provision for estimated claims		5			21
	Adjustment to estimate		(51	)		—
	Settlement of claims		(7	)		(21	)
	Ending balance	$	40		$	93
	The warranty obligations are included in accrued expenses and other current liabilities in the consolidated balance sheets presented.

Debt

Debt	12 Months Ended
	Dec. 31, 2014
Debt Disclosure [Abstract]
Debt	9. Debt
	(a) Bank credit facility
	The Company has a revolving credit facility with a bank pursuant to a Loan and Security Agreement dated January 30, 2009 (the “Revolving Credit Facility”). In February 2014, the Company modified the revolving credit agreement that had expired in October 2013 and extended the maturity date to February 2015. The revolving credit agreement now provides for borrowings of up to $10.0 million based primarily on accounts receivable, and is subject to certain financial covenants requiring the Company to maintain minimum levels of liquidity. In February 2015, the Company amended the credit facility to extend its maturity to April 2015. Outstanding borrowings accrue interest at the Wall Street Journal published prime rate plus 0.75%. Substantially all of the assets of the Company are pledged as collateral.
	At December 31, 2014 and 2013, there was no outstanding balance under the revolving credit facility.
	In February 2015, the Company amended its revolving credit facility to extend the maturity through April 2015. The revolving credit facility was set to expire in February 2015.
	(b) Capital leases
	The Company is leasing certain equipment under capital leases payable through 2018. The capital lease arrangements bear interest at interest rates ranging between 1.5% and 8.4%. Assets under capital lease obligations totaled $1.5 million and $789,000 as of December 31, 2014 and 2013, respectively.
	Accumulated depreciation of leased assets was $721,000 and $276,000 for the years ended December 31, 2014 and 2013, respectively. Depreciation expense associated with capital leases totaled $443,000, $258,000 and $56,000 for the years ended December 31, 2014, 2013 and 2012, respectively.
	The future principal and interest payments under the capital lease obligations are as follows:
	(in thousands)	December 31,
		2014
	2015	$	453
	2016		373
	2017		194
	2018		6
	Total	$	1,026
	Less: interest		(49	)
	Total principal payments		977
	Less: current portion		(440	)
	Long-term portion	$	537
	Interest paid during the period	$	35
	(c) Term loans
	The Company purchases prepaid licenses and associated maintenance and finances these purchases with term loans. The following table outlines the Company’s term loans associated with the licenses and maintenance:
								December 31,
	(in thousands)	Term			Interest			2014			2013
		(in years)			Rate
	Balance-Beginning of Period							$	142		$	274
	Borrowings:
	Jan-14		2.5			6.5	%		387			—
	Principal Payments								(262	)		(132	)
	Balance- End of Period							$	267		$	142
	Reported as:
	Current								185			113
	Long-term								82			29
	Total							$	267		$	142
	Interest paid during the period							$	24		$	17
	The future principal and interest payments under the term loan are as follows:
	(in thousands)	December 31,
		2014
	2015	$	197
	2016		84
	Total	$	281
	Less: interest		(14	)
	Total principal payments	$	267

Commitments_and_Contingencies

Commitments and Contingencies	12 Months Ended
	Dec. 31, 2014
Commitments and Contingencies Disclosure [Abstract]
Commitments and Contingencies	10. Commitments and contingencies
	(a) Operating lease obligations
	Lexington, Massachusetts
	On March 2, 2012, the Company amended the lease for its corporate headquarters in Lexington, Massachusetts. The amended lease provides for expansion and relocation of the office to another building in the same office complex and was effective in September 2012; the Company began occupying the new office space in November 2012. The termination date specified in the amended lease is seven years after the relocation date. The lease may be terminated early, 60 months after the relocation date, subject to payment of a termination fee. The Company has amended its lease on multiple occasions to increase its leased space within the same office building. In April 2014, the Company amended its lease agreement and increased its leased space from 60,000 square feet to 72,000 square feet.
	On January 16, 2015, the Company amended its lease agreement for its corporate headquarters, to lease approximately 21,000 of additional square footage. The amendment increased the total square footage leased to approximately 93,000 and extended the term through December 2021. The additional rent expense is approximately $7.9 million and the landlord has agreed to contribute approximately $735,000 towards leasehold improvements.
	The Company received tenant improvement reimbursements totaling $1.9 million from the landlord for improvements made to its leased premises, of which $1.5 million was received in the fourth quarter of 2012, $198,000 was received in the first quarter of 2013 and $218,000 was received during the second quarter of 2014. The Company amortizes the tenant improvement liability over the remaining term of the lease as a reduction of rent expense. The tenant improvement liability is classified as other current and long-term liabilities in the consolidated balance sheets.
	Santa Cruz, California
	In September 2013, the Company entered into a lease for approximately 8,500 square feet of office space for its West Coast engineering office in Santa Cruz, California. The Lease terminates in 2018. The lease may be terminated early, 36 months after the relocation date, subject to payment of a termination fee.
	San Francisco, California
	The Company leases offices for research and development in San Francisco, California on a short-term basis. The leases terminate in July 2015.
	Uxbridge, England
	In August 2013, the Company revised its existing office service agreement to relocate its European headquarters, which is located in Uxbridge, England, into a different suite within the same building. The Company conducts sales, marketing, services and support activities for its European operations at this location. The lease terminates in 2015. The Company will occupy approximately 4,200 square feet beginning in the fourth quarter of 2013.
	Other operating leases
	The Company enters into operating lease agreements primarily for information technology equipment and short-term virtual offices in foreign locations.
	The future minimum lease payments under all operating lease agreements at December 31, 2014 are as follows:
	(in thousands)	Facility		Other		Total
		leases		operating
				leases
	2015	$	1,993	$	27	$	2,020
	2016		1,883		—		1,883
	2017		1,928		—		1,928
	2018		1,973		—		1,973
	2019		1,425		—		1,425
	Total	$	9,202	$	27	$	9,229
	Total rent expense for the years ended December 31, 2014, 2013 and 2012 was, $2.1 million, $1.4 million and $876,000 and, respectively.
	The Company recorded and $278,000, $249,000 and $21,000 of amortization expense related to the tenant improvement liability during the years ended December 31, 2014, 2013 and 2012, respectively. The amortization expense is recorded as a reduction of rent expense.
	(b) Litigation
	The Company is not presently a party to any litigation that it believes might have a material adverse effect on its business operations or financial statements.
	(c) Indemnifications
	As permitted under Delaware law, the Company’s Certificate of Incorporation and By Laws provide that the Company indemnify its stockholders, officers, directors, and partners, and each person controlling the stock held for certain events or occurrences that happen by reason of the relationship with or position held at the Company. The Company’s agreements with customers generally require the Company to indemnify the customer against claims in which the Company’s products infringe third-party patents, copyrights, or trademarks, and indemnify against product liability matters.
	As of December 31, 2014 and 2013, the Company had not experienced any material losses related to these indemnification obligations, and no material claims with respect thereto were outstanding. The Company does not expect significant claims related to these indemnification obligations and, consequently, concluded that the fair value of these obligations is negligible, and no related reserves were established.

Redeemable_Convertible_Preferr

Redeemable Convertible Preferred Stock and Stockholders' Equity (Deficit)	12 Months Ended
	Dec. 31, 2014
Equity [Abstract]
Redeemable Convertible Preferred Stock and Stockholders' Equity (Deficit)	11. Redeemable convertible preferred stock and stockholders’ equity (deficit)
	(a) Authorized and reserved capital
	At December 31, 2014, the Company is authorized to issue up to 270,000,000 shares of stock, consisting of 250,000,000 shares of common stock and 20,000,000 shares of Undesignated Preferred Stock. Of the 250,000,000 authorized shares of common stock, 3,709,156 shares are reserved for issuance upon the exercise of stock options.
	(b) Redeemable convertible preferred stock
	On June 30, 2014, upon the closing of the initial public offering of the Company’s common stock, 20,956,426 outstanding shares of redeemable convertible preferred stock were automatically converted into 13,970,934 shares of common stock.
	The changes in redeemable convertible preferred stock were as follows:
	(in thousands)		Series				Amount				Series				Amount				Series			Amount			Total			Amount
			A								B								C						Shares
			Shares								Shares								Shares
	Balance at January 1, 2013			11,200			$	43,806				5,438			$	20,300				4,318		$	22,549			20,956		$	86,655
	Accretion of redeemable convertible preferred stock to redemption value							2,250								1,200							1,502						4,952
	Balance at December 31, 2013			11,200				46,056				5,438				21,500				4,318			24,051			20,956			91,607
	Accretion of redeemable convertible preferred stock to redemption value							1,109								592							741						2,442
	Conversion of preferred stock into common stock			(11,200	)			(47,165	)			(5,438	)			(22,092	)			(4,318	)		(24,792	)		(20,956	)		(94,049	)
	Balance at December 31, 2014			—			$	—				—			$	—				—		$	—			—		$	—
	The following table summarizes the redeemable convertible preferred stock authorized, issued and outstanding at December 31, 2013:
	(in thousands, except price and		Date of Issuance		Price				Shares				Proceeds				Aggregated
	share data)								Authorized,								Liquidation
									Issued and								Preference
									Outstanding
	Series A		February 2002(1) - April 2005		$	2.0089				11,200,158			$	22,500			$	22,500
	Series B		Jan-06		$	2.2065				5,438,478				12,000				12,000
	Series C		December 2007 - March 2008		$	3.474				4,317,790				15,000				15,000
	Total									20,956,426			$	49,500			$	49,500
	-1	The financing was closed in two rounds, the first on February 22, 2002, for proceeds of $6.0 million, and the second on December 19, 2002, for proceeds of $7.5 million.
	The Series A, Series B, and Series C are collectively referred to as the “Preferred Stock.” The terms of the Preferred Stock include, but are not limited to, the following:
	Voting
	Each holder of Preferred Stock is entitled to the number of votes equal to the number of whole shares of common stock into which the shares of Preferred Stock held by such holder are convertible.
	Dividends
	Each share of Preferred Stock is entitled to receive dividends at the same rate as dividends are paid with respect to the common stock if, as, and when such dividends are declared by the Board of Directors. Dividends may be declared and paid on Preferred Stock from funds lawfully available, therefore, if, as, and when determined by the Board of Directors. Through December 31, 2014, no dividends have been declared.
	Conversion
	At the option of the holder, the Series A shares are convertible on a one-for-one basis into shares of common stock at an initial conversion price equal to $2.0089 per share, the Series B shares are convertible on a one-for-one basis into shares of common stock at an initial conversion price equal to $2.2065 per share, and the Series C shares are convertible on a one-for-one basis into shares of common stock at an initial conversion price equal to $3.474 per share, subject in each case to adjustment on account of any dilutive issuances.
	Preferred Stock shall automatically convert into common stock, at the then-applicable conversion rates, upon (1) the closing of a firm commitment underwritten initial public offering of the common stock in which the price per share to the public is at least three times the highest then-applicable conversion price of any shares of Preferred Stock or (2) written notice from the holders of at least 75% in voting power of the then-outstanding shares of Preferred Stock.
	Series A and Series B financings contained an automatic conversion clause, which could have been triggered by a holder not acquiring a pro rata portion of securities offered by the Company at a price per share less than the conversion price in effect just prior to a sale or issuance of Preferred Stock. Upon such occurrence, the Preferred Stock could have been converted into shares of Series A-1 and Series B-1 redeemable convertible preferred stock, which had certain subordinated rights to the Series A and Series B shares. As part of the Series C transaction, this clause was eliminated and no shares of Series A-1 or Series B-1 have been issued.
	Redemption
	On February 26, 2014, the holders of the Company’s Preferred Stock extended the redemption date from December 11, 2014, to any time on or after December 31, 2015. At the written election of holders of a majority of the outstanding shares of Preferred Stock made at any time on or after December 31, 2015 (the “Redemption Election”), the Company shall be required to redeem all of the outstanding shares of Preferred Stock in three equal annual installments. The first installment of such redemption shall occur on a date (the “First Redemption Date”) specified in the Redemption Election, which shall be not less than 90 days after the date of the Redemption Election, and the second and third installments of such redemption shall occur on the first and second anniversaries, respectively, of the First Redemption Date. The redemption price per share of Preferred Stock shall be equal to (1) $2.0089 per share for Series A Preferred Stock, $2.2065 per share for Series B Preferred Stock, and $3.474 per share for Series C Preferred Stock (each of such amounts as adjusted for any stock dividend, stock split, combination of shares, reclassification, or other similar event with respect to the applicable series of Preferred Stock), plus all dividends declared but unpaid on such share on the applicable redemption date, plus (2) an additional amount of 10% per annum from the date of issuance of such share of Preferred Stock.
	The Company was accreting the Preferred Stock to its redemption value through the earliest redemption date.
	Liquidation
	In the event of any voluntary or involuntary sale, liquidation, dissolution, or winding-up of the Company (including (1) certain mergers and consolidations involving a change in ownership of more than 50% of voting control and (2) the sale or transfer of all or substantially all of the assets of the Company, in each case, if the holders of a majority of the then-outstanding shares of Preferred Stock, voting together as a single class, elect to treat such transaction as a liquidation event), the holders of Preferred Stock shall be entitled to receive an amount equal to the greater of (1) $2.0089 per share for holders of Series A, $2.2065 per share for holders of Series B, and $3.474 per share for holders of Series C (as adjusted for any stock split, stock dividend, combination of shares, reclassification, or other similar event with respect to the Preferred Stock), plus all declared and unpaid dividends thereon to and including the date full payment shall be tendered to the holders of Preferred Stock, or (2) such amount per share of the applicable series of Preferred Stock as would have been payable had all shares been converted to common stock immediately prior to such liquidation. If, upon liquidation, dissolution, or winding-up of the Company, the assets of the Company are not sufficient to permit payment of the full liquidation preference of the Preferred Stock, the assets will be distributed ratably among the holders of the Preferred Stock on a pari passu basis in proportion to the full preferential amount each such holder is, otherwise, entitled to receive. After payment in full of the liquidation preference to the holders of the Preferred Stock, the remaining assets of the Company available for distribution shall be distributed among the holders of common stock ratably in proportion to the number of shares of common stock held by them.
	(c) Stock split
	In May 2014, the Company’s Board of Directors approved a 1-for-1.5 reverse stock split of the Company’s common stock. The reverse stock split became effective on May 30, 2014. Upon the effectiveness of the reverse stock split, (i) every 1.5 shares of outstanding common stock was combined into one share of common stock, (ii) the number of shares of common stock into which each outstanding warrant or option to purchase common stock is exercisable was proportionally decreased, (iii) the exercise price of each outstanding warrant or option to purchase common stock was proportionately increased, and (iv) the conversion ratio for each share of preferred stock outstanding was proportionately reduced. Unless otherwise indicated, all of the share numbers, share prices and exercise prices in these financial statements have been adjusted, on a retroactive basis, to reflect this 1-for-1.5 reverse stock split.
	(d) Accumulated other comprehensive (loss) income
	The following table presents the changes in accumulated other comprehensive income before taxes, as the tax effect is not material to the consolidated financial statements:
	(in thousands)		Foreign				Affected line item in the
			Currency				statement where net income
			Translation				is presented
			Adjustments
	Balance at January 1, 2013		$	(42	)
	Other comprehensive income			(108	)
	Amounts reclassified from accumulated other comprehensive income:
	Closure of foreign branches			5				Other income (expense)
	Net current-period other comprehensive loss			(103	)
	Balance at December 31, 2013			(145	)
	Other comprehensive income			(100	)
	Amounts reclassified from accumulated other comprehensive income:
	Closure of foreign branch			145				Other income (expense)
	Net current-period other comprehensive loss			45
	Balance at December 31, 2014		$	(100	)
	(e) Warrants
	In May 2014, the Company issued 108,853 shares of common stock upon the net exercise of warrants which were exercisable for 120,000 shares of common stock with the exercise price of $1.10 per share. The remaining 11,147 shares of common stock issuable upon exercise of the warrants were forfeited by the holders of such warrants as part of the net exercise.

Employee_Benefit_Plans

Employee Benefit Plans	12 Months Ended
	Dec. 31, 2014
Postemployment Benefits [Abstract]
Employee Benefit Plans	12. Employee benefit plans
	(a) Defined contribution plan
	United States
	The Company has a 401(k) plan whereby participating employees may defer a portion of their pretax earnings, not to exceed 50% of their total earnings. Employees must reach the age of 21 to be eligible to participate in the 401(k) plan. The Company may, at its discretion, make profit sharing or matching contributions. The Company made a $273,000 matching contribution to the 401(k) plan for the year-ended December 31, 2013 to the eligible employee’s accounts during the first quarter of 2014. Effective January 1, 2014, the Company increased the matching contribution to 50% of the contributions each employee makes to the plan, up to 6% of such employee’s compensation, per payroll period. The Company contributed $954,000 to the eligible employee’s accounts during the year ended December 31, 2014 payroll periods. Employer contributions vest over a four-year period commensurate with the employee’s hire date and years of service.
	International
	The Company has elected to make matching contributions of 3% to each eligible employee’s defined contribution pension plan in certain countries in which it operates. The Company contributed $61,000 to the eligible employee’s accounts during the year ended December 31, 2014.

Stock_Award_Plans_and_Stock_Ba

Stock Award Plans and Stock Based Compensation	12 Months Ended
	Dec. 31, 2014
Disclosure of Compensation Related Costs, Share-based Payments [Abstract]
Stock Award Plans and Stock Based Compensation	13. Stock award plans and stock based compensation
	(a) Equity incentive plan
	In May 2014, the Company’s 2014 Stock Option and Incentive Plan (“2014 Plan”), was adopted by the Company’s board of directors and approved by its stockholders and became effective in June 2014. The 2014 Plan replaces the Amended and Restated 2002 Stock Option and Incentive Plan (“2002 Plan”) as the Company’s board of directors has determined not to make additional awards under the 2002 Plan. The 2014 Plan allows the compensation committee to make equity-based incentive awards to the Company’s officers, employees, directors and other key persons (including consultants).
	Stock options expire no later than 10 years from the date of grant and generally vest over a period of four years. At the discretion of the Board of Directors, certain option grants may be immediately exercisable but subject to a right to repurchase, at cost, pursuant to the vesting schedule of the individual grant.
	At December 31, 2014, there were 2,347,615 shares available for future grant under the 2014 Plan.
	(b) Employee stock purchase plan
	In May 2014, the Company’s board of directors adopted and its stockholders approved the Employee Stock Purchase Plan (“ESPP”). Each employee who is a participant in the ESPP may purchase shares by authorizing payroll deductions of his or her base compensation during an offering period. Unless the participating employee has previously withdrawn from the offering, his or her accumulated payroll deductions will be used to purchase ordinary shares on the last business day of the offering period at a price equal to 85% of the fair market value of the common stock on the first business day or the last business day of the offering period, whichever is lower. The initial ESPP offering period began on June 25, 2014 and ends on February 28, 2015. All subsequent offering periods will be for six months and begin on March 1st and September 1st of each year.
	At December 31, 2014, there were 448,000 shares available for future grant under the ESPP.
	(c) Early exercise of stock options
	The Company issues stock option agreements generally to Company executives and members of the Board of Directors, which may permit options to be exercised at any time. The Company may also include an early exercise provision for incentive stock option agreements at its discretion. The unvested shares of common stock exercised are subject to the Company’s right to repurchase at the original exercise price upon termination of employment or other relationship.
	During 2013, 74,375 stock options were exercised prior to vesting for an aggregate purchase price of $321,000. The weighted average grant-date fair value of these options was $1.92.
	At December 31, 2014 and 2013, a total of 40,202 and 62,706 shares of unvested stock options exercised were subject to repurchase at an aggregate price of $184,000 and $275,000, respectively. These amounts are recorded as accrued and other current liabilities in the Company’s consolidated balance sheets and will be reclassified to equity as the Company’s repurchase right lapses.
	During the year ended December 31, 2014 and 2013, 22,504 and 11,669 stock options associated with the early exercise vested, respectively.
	(d) Valuation of share-based compensation
	Prior to June 25, 2014, the Company’s common stock was not publically traded, the Company granted stock options to employees at an exercise price deemed by the Board of Directors to be equal to the fair market value of the common stock on the date of grant. The fair market value of the common stock prior to June 25, 2014 has been determined by the Board of Directors at each stock option measurement date based on a variety of different factors, including, but not limited to, the results obtained from independent third-party appraisals, the Company’s financial position and historical financial performance, the status of technological development within the Company, the composition and ability of the current engineering and management team, an evaluation of the Company’s competition, the current climate in the marketplace, the illiquid nature of the common stock, arm’s-length sales of the Company’s capital stock (including redeemable convertible preferred stock), the effect of the rights and preferences of the preferred shareholders, and the prospects for a liquidity event, among others.
	All stock option grants on or after June 25, 2014 use the Company’s closing market price on the date of grant as the exercise price.
	The Company utilizes the Black-Scholes option-pricing model to estimate the fair value of stock options awarded to employees and rights to acquire stock under the ESPP plan, which requires several key assumptions to be made.
	Weighted average assumptions used to apply this model were as follows:
			Year ended December 31,
			2014			2013			2012
	Risk-free interest rate(1)			1.88	%		1.49	%		0.87	%
	Expected term (years)(2)			6.04			6.03			6.02
	Expected dividend yield(3)			—	%		—	%		—	%
	Expected volatility of underlying stock(4)			54	%		52	%		46	%
	Weighted average assumptions used to estimate the fair value of the rights to acquire stock under the ESPP plan during the initial offering period were as follows:
			Year ended
			December 31,
			2014
	Risk-free interest rate(1)			0.08	%
	Expected term (years)(2)			0.68
	Expected dividend yield(3)			—	%
	Expected volatility of underlying stock(4)			40	%
	-1	Risk-free interest rate—the yield on zero-coupon U.S. Treasury securities with maturities similar to the expected term of the award being valued is used as the risk-free interest rate.
	-2	Expected term—the expected term for stock options granted based on a review of the period that the Company’s stock option awards are expected to be outstanding and is calculated using the simplified method, which represents the average of the contractual term of the options and the weighted-average vesting period of the options. The Company uses the simplified method because it does not have sufficient historical option exercise data to provide a reasonable basis upon which to estimate the expected term.
	-3	Expected dividend yield—the expected dividend yield was not considered in the option pricing formula since the Company has not declared dividends and does not expect to pay dividends in the foreseeable future.
	-4	Expected volatility—the Company is responsible for estimating volatility. The Company has been a private company and does not have relevant historical data to develop its volatility assumptions and, therefore, analyzed the volatility of several public peer companies to support the assumptions used in its calculations for the periods presented.
	The amount of stock-based compensation recognized is based on the value of the portion of the awards that are ultimately expected to vest. The Company estimates forfeitures at the time of grant and revises them, if necessary, in subsequent periods if actual forfeitures differ from those estimates. The term “forfeitures” is distinct from “cancellations” or “expirations” and represents only the unvested portion of the surrendered stock-based award. Based on a historical analysis, a forfeiture rate of 9%, 13% and 13% per year, including executive officer awards, was applied to stock-based awards for the years ended December 31, 2014, 2013 and 2012, respectively.
	(e) Summary of share-based compensation expense
	The Company uses the straight-line attribution method to recognize expense for stock-based awards such that the expense associated with awards is evenly recognized throughout the period.
	Stock-based compensation included in costs and operating expenses related to the awards of stock options and the employee stock purchase plan are as follows:
			Year ended December 31,
	(in thousands)		2014			2013			2012
	Cost of maintenance and professional services		$	138		$	50		$	7
	Research and development			500			263			207
	Sales and marketing			532			137			171
	General and administrative			442			190			65
	Total		$	1,612		$	640		$	450
	At December 31, 2014 there was $4.0 million of unrecognized compensation expense related to non-vested employee stock awards that is expected to be recognized over a weighted-average amortization period of 3.0 years.
	(f) Stock option awards
	Stock option activity is as follows:
	(in thousands, except per share data)		Number			Weighted			Weighted			Aggregate
			of			average			average			intrinsic
			shares			exercise			remaining			value
						price			contractual
									life (in
									years)
	Outstanding, January 1, 2013			3,477		$	1.55					$	10,737
	Granted			993			6.8
	Exercised			(530	)		1.73
	Forfeited			(133	)		3.14
	Expired			(30	)		0.32
	Outstanding, December 31, 2013			3,777		$	2.86					$	23,491
	Granted			332			12.95
	Exercised			(302	)		1.58
Forfeited			(77	)		4.61
Expired			(21	)		0.74
Outstanding December 31, 2014			3,709		$	3.84			6.04		$	34,206
Exercisable, December 31,2014			2,961		$	2.63			5.36		$	30,697
Vested or expected to vest, December 31, 2014			3,615		$	3.73			5.97		$	33,733
The following table summarizes information relating to options granted and exercised:
		Year ended December 31,
(in thousands, except per share data)		2014			2013			2012
Weighted average fair value per share of options granted		$	6.75		$	3.43		$	1.4
Aggregate intrinsic value of options exercised		$	2,989		$	1,685		$	1,007
Fair value of options vested		$	1,338		$	553		$	540
Cash proceeds received upon exercise		$	476		$	916		$	436
The aggregate intrinsic value is calculated as the difference, if any, between the fair value of the underlying stock on the date the award is exercised and the per-share price an employee paid to exercise the award.
(g) Restricted common stock
During 2007, the Company issued 45,724 shares of restricted common stock to an officer at a purchase price of $1.10 per share in exchange for a nominal cash payment and a promissory note of $50,000. The note bears no interest and has partial recourse to employee assets for up to 50% of the value of the note. The promissory note is collateralized by the underlying shares of common stock and due within 10 days of sale of the shares or five years from the date of issuance. As of December 31 2013, there were no unvested shares that were purchased pursuant to this promissory note, and no repayments had occurred. During the three months ended March 31, 2014 the note was repaid.
No compensation expense was recorded in the years ended December 31, 2014 and 2013.

Income_Taxes

Income Taxes	12 Months Ended
	Dec. 31, 2014
Income Tax Disclosure [Abstract]
Income Taxes	14. Income taxes
	(Loss) income before the provision for income taxes consists of the following:
		December 31,
	(in thousands)	2014			2013			2012
	United States	$	(16,913	)	$	(5,838	)	$	816
	Foreign		346			423			341
	Total	$	(16,567	)	$	(5,415	)	$	1,157
	The provision for income taxes in the accompanying consolidated financial statements consists of the following:
		December 31,
	(in thousands)	2014			2013			2012
	Current income tax provision:
	Federal	$	—		$	—		$	—
	State		40			—			13
	Foreign		129			108			96
	Total current income tax provision		169			108			109
	Deferred income tax provision:
	Federal		—			—			—
	State		—			—			—
	Foreign		—			—			—
	Total deferred income tax provision		—			—			—
	Total income tax provision	$	169		$	108		$	109
	A reconciliation of the U.S. statutory tax rate to the Company’s effective tax rate is as follows:
		December 31,
		2014			2013			2012
	Tax due at statutory rate		34	%		34	%		34	%
	State income taxes, net of federal tax benefit		(0.2	%)		—	%		1.1	%
	Foreign income taxes		0.3	%		(0.9	%)		8	%
	Meals & entertainment		(0.4	%)		(1.1	%)		13.5	%
	Stock compensation		(2.1	%)		(1.9	%)		4.6	%
	Fines & penalties		—	%		(0.3	%)		1.2	%
	Tax credits		7.3	%		26.8	%		(17.3	%)
	Change in valuation allowance		(39.9	%)		(58.5	%)		(36.0	%)
	Effective tax rate		(1.0	%)		(1.9	%)		9.1	%
	The Company’s effective tax rate differs from the statutory rate each year primarily due to the jurisdictional mix of earnings (profits are earned in foreign jurisdictions and taxed at rates different than the U.S. statutory tax rate), the valuation allowance maintained against the net U.S. deferred tax assets and the impact of permanent differences (primarily related to non-deductible expenses and U.S. research and development credits). Most of the Company’s foreign operations are treated as branches for US tax filings. As a result, their income is included in the parent Company’s US federal income tax return and is also taxed in their local jurisdictions. Included in the foreign income taxes reconciling item in the above table is the rate differential from the U.S. federal statutory rate of 34% for the non-branch subsidiaries as well as foreign income also subject to U.S. tax, less the foreign tax credit, if any, allowed in the current year.
	Net deferred tax assets (liabilities) consisted of the following:
		December 31,
	(in thousands)	2014			2013
	Net operating loss carryforwards	$	18,235		$	11,919
	Tax credit carryforwards		5,134			3,814
	Start-up and research and development capitalized expenditures		1,806			2,674
	Deferred revenue		1,325			1,590
	Other temporary differences		1,858			3,297
	Gross deferred assets		28,358			23,294
	Valuation allowance		(27,490	)		(21,410	)
	Deferred tax assets, net		868			1,884
	Depreciation		(333	)		(1,463	)
	Other temporary differences		(535	)		(421	)
	Gross deferred tax liabilities		(868	)		(1,884	)
	Net deferred tax asset (liability)	$	—		$	—
	In assessing the ability to realize the net deferred tax assets, management considers various factors including taxable income in carryback years, future reversals of existing taxable temporary differences, tax planning strategies and projections of future taxable income, to determine whether it is more likely than not that some portion or all of the net deferred tax assets will not be realized. Based upon the Company’s historical and forecasted future U.S. losses, the Company has determined that the uncertainty regarding the realization of these assets is sufficient to warrant the need for a full valuation allowance against its net deferred tax assets. The net increases in the valuation allowance of approximately $6.1 million and $3.4 million from 2013 to 2014 and 2012 to 2013, respectively, principally relate to an increase in the Company’s U.S. net operating loss and tax credit carryforward deferred tax assets against which a full valuation allowance is maintained.
	As of December 31, 2014 and 2013, the Company had U.S. federal net operating loss carryforwards of approximately $54.4 million and $36.6 million, respectively and U.S. state net operating loss carryforwards of approximately $42.1 million and $15.5 million, respectively. These net operating loss carryforwards expire at various dates through 2034. As of December 31, 2014 and 2013, the Company had U.S. federal and state tax credit carryforwards available of approximately $6.0 million and $4.5 million, respectively. These tax credit carryforwards expire at various dates through 2034.
	Included in the net operating losses, the Company has U.S. federal and state net operating losses of approximately $3.8 million and $3.3 million at December 31, 2014 and December 31, 2013, respectively, resulting from the exercise of employee stock options. These net operating losses have been excluded from the above deferred tax table. In accordance with ASC Topic 740, Income Taxes, and ASC Topic 718, “Compensation—Stock Compensation”, recognition of these assets would occur upon utilization of these deferred tax assets to reduce taxes payable and would result in a credit to additional paid-in capital within stockholders’ equity rather than the provision for income taxes.
	Under Sections 382 and 383 of the Internal Revenue Code of 1986, as amended, or the Code, if a corporation undergoes an ‘‘ownership change,’’ the corporation’s ability to use its pre-change net operating loss carryforwards and other pre-change tax attributes, such as research tax credits, to offset its post-change income and taxes may be limited. In general, an ‘‘ownership change’’ generally occurs if there is a cumulative change in our ownership by ‘‘5-percent shareholders’’ that exceeds 50 percentage points over a rolling three-year period. Similar rules may apply under state tax laws. We may have experienced an ownership change in the past and may experience ownership changes in the future as a result of this issuance or future transactions in our stock, some of which may be outside our control. As a result, if we earn net taxable income, our ability to use our pre-change net operating loss carryforwards, or other pre-change tax attributes, to offset U.S. federal and state taxable income and taxes may be subject to significant limitations.
	On January 1, 2009, the Company adopted ASC 740-10, “Income Taxes”. The Company had no uncertain positions or unrecorded liabilities for uncertain tax positions upon adoption and the adoption did not have an impact on the Company’s balance sheet or retained earnings. As of December 31, 2014, 2013 and 2012, the Company had no recorded liabilities for uncertain tax positions.
	Interest and penalty charges, if any, related to uncertain tax positions would be classified as income tax expense in the accompanying consolidated statements of operations. As of December 31, 2014, 2013 and 2012, the Company had no accrued interest or penalties related to uncertain tax positions.
	The Company is subject to taxation in the United States, Belgium, the United Kingdom, Italy, the Netherlands and Singapore. At December 31, 2013, domestic tax years from 2011 through 2014 and foreign tax years from 2006 through 2014 remain open to examination by the taxing authorities. In addition, all of the Company’s U.S. net operating loss carryforwards may be subject to adjustments by taxing authorities in future years in which they are utilized.
	Income taxes have not been provided on certain undistributed earnings of foreign subsidiaries of approximately $558,000 because such earnings are considered to be indefinitely reinvested in the business. The undistributed earnings are primarily utilized to fund working capital requirements. The amount of income taxes payable on the earnings that are indefinitely reinvested in foreign operations are immaterial.

Computation_of_Net_Loss_Per_Sh

Computation of Net Loss Per Share	12 Months Ended
	Dec. 31, 2014
Earnings Per Share [Abstract]
Computation of Net Loss Per Share	15. Computation of net loss per share
	The Company calculates basic and diluted net loss per common share by dividing the net loss adjusted for the accretion on the redeemable convertible preferred stock by the weighted average number of common shares outstanding during the period. The Company has excluded all potentially dilutive shares, which include redeemable convertible preferred stock, warrant for common stock, common stock subject to repurchase and outstanding common stock options, from the weighted average number of common shares outstanding as their inclusion in the computation for all periods would be anti-dilutive due to net losses. The Company’s redeemable convertible preferred stock are participating securities as defined under the authoritative guidance, but are excluded from the earnings per share calculation as they do not have an obligation to share or fund in the Company’s net losses.
	The components of net loss per share are as follows:
		For the Year Ended December 31,
	(in thousands, except per share data)	2014			2013			2012
	Numerator:
	Net (loss) income	$	(16,736	)	$	(5,523	)	$	1,048
	Accretion of preferred stock		(2,442	)		(4,952	)		(4,957	)
	Net loss attributable to common stockholders		(19,178	)		(10,475	)		(3,909	)
	Denominator:
	Weighted average common shares outstanding used in computing basic and diluted net loss per common share		13,950			3,359			2,868
	Net loss per share, basic and diluted	$	(1.37	)	$	(3.12	)	$	(1.36	)
	The following common stock equivalents were excluded from the computation of diluted net loss per share attributable to common stockholders because they had an antidilutive impact:
		For the Year Ended December 31,
	(in thousands)	2014			2013			2012
	Options to purchase common stock		3,709			3,777			3,477
	Common stock subject to repurchase		40			63			—
	Warrants		—			120			120
	Convertible preferred stock		—			13,971			13,971
	Total		3,749			17,931			17,568

Segment_and_Geographic_Informa

Segment and Geographic Information	12 Months Ended
	Dec. 31, 2014
Segment Reporting [Abstract]
Segment and Geographic Information	16. Segment and geographic information
	Operating segments are defined as components of an enterprise about which separate financial information is available that is evaluated regularly by the chief operating decision maker (“CODM”) in deciding how to allocate resources and in assessing performance.
	The Company develops healthcare information technology security solutions and provides professional services, maintenance, and training related to its licensed software delivered on appliances. The Company derives substantially all of its revenue from the sale and support of one group of similar products and services— licensed software on delivered appliances for authentication and access management in the healthcare market. The Company’s CODM is its Chief Executive Officer. To assess performance, the Company’s CODM reviews financial information on a consolidated basis.
	The Company views its operations and manages its business as one operating segment—healthcare information technology solutions. The Company derived its revenues from the following geographic areas:
		Year ended December 31,
	(in thousands)	2014		2013		2012
	United States	$	76,159	$	56,371	$	42,269
	United Kingdom		5,241		4,093		3,813
	Rest of world		15,579		10,647		7,942
	Total	$	96,979	$	71,111	$	54,024
	Long-lived assets related to the Company’s U.S. and international operations were as follows:
		December 31,
	(in thousands)	2014		2013
	United States	$	7,562	$	6,546
	United Kingdom		78		136
	Rest of world		—		—
	Total	$	7,640	$	6,682

Concentration_of_Risk_and_OffB

Concentration of Risk and Off-Balance Sheet Risk	12 Months Ended
	Dec. 31, 2014
Risks and Uncertainties [Abstract]
Concentration of Risk and Off-Balance Sheet Risk	17. Concentration of risk and off-balance sheet risk
	Financial instruments that subject the Company to significant concentrations of credit risk consist primarily of cash and cash equivalents and accounts receivable. The Company maintains substantially all of its cash and cash equivalents in institutional money market mutual funds. The fund provides daily liquidity and invests in a portfolio of short-term money market instruments. To manage accounts receivable credit risk, the Company continuously evaluates the creditworthiness of its customers and reseller and maintains allowances for potential credit losses.
	No customers or resellers accounted for 10% or more of revenues for the year ended December 31, 2014. One reseller accounted for 10% or more of revenues in each of the years ended December 31, 2013 and 2012, respectively.
	No customers or resellers accounted for 10% or more of accounts receivable at December 31, 2014 and 2013, respectively.
	The Company does not have any off-balance sheet arrangements and did not have any such arrangements during years ended December 31, 2014, 2013 and 2012.

Related_Party_Transactions

Related Party Transactions	12 Months Ended
	Dec. 31, 2014
Related Party Transactions [Abstract]
Related Party Transactions	18. Related party transactions
	As a result of the acquisition of Validus, the Company has recorded a contingent liability for the earn-out associated with the acquisition, which if revenues associated with the intellectual property exceed $1.7 million; an amount will be due to the former Validus CEO, who is an employee of the Company, but who is not a director, executive officer or five percent holder of the Company’s equity securities. As of December 31, 2014 and 2013, the Company has recorded a contingent liability of $632,000 and $1.0 million, respectively. There have been no payments made from the inception of the liability through December 31, 2014.

Quarterly_Financial_Informatio

Quarterly Financial Information (Unaudited)	12 Months Ended
	Dec. 31, 2014
Quarterly Financial Information Disclosure [Abstract]
Quarterly Financial Information (Unaudited)	19. Quarterly financial information (unaudited)
			Three months ended
	(in thousands)		Dec. 31,			Sept. 30,			June 30,			March 31,
			2014			2014			2014			2014
	Revenues		$	29,028		$	25,278		$	23,233		$	19,440
	Gross profit			20,908			16,638			16,358			13,087
	Net loss			(1,663	)		(4,454	)		(3,552	)		(7,067	)
	Net loss attributable to common shareholders, basic and diluted (1)(2)		$	(0.07	)	$	(0.19	)	$	(1.08	)	$	(2.29	)
			Three months ended
			Dec. 31,			Sept. 30,			June 30,			March 31,
			2013			2013			2013			2013
	Revenues		$	21,634		$	17,907		$	17,315		$	14,255
	Gross profit			15,213			13,375			13,214			10,440
	Net loss			(3,259	)		(650	)		(84	)		(1,530	)
	Net loss attributable to common shareholders, basic and diluted (1)(2)		$	(1.26	)	$	(0.54	)	$	(0.41	)	$	(0.59	)
	-1	Net loss attributable to common shareholders includes accretion of preferred stock for all periods presented through the IPO closing date of June 30, 2014.
	-2	Net loss per share for the four quarters of each fiscal year may not sum to the total for the fiscal year due to the different number of shares outstanding during each period.

Organization_and_Business_Poli

Organization and Business (Policies)	12 Months Ended
	Dec. 31, 2014
Accounting Policies [Abstract]
Basis of presentation and principles of consolidation	(b) Basis of presentation and principles of consolidation
	The accompanying consolidated financial statements have been prepared in accordance with accounting principles generally accepted in the United States of America (“U.S. GAAP”). The Company is subject to a number of risks. Principal among these risks are dependence on key individuals, competition from substitute products and larger companies, the successful development and marketing of its products, and recruitment of key personnel.
	Management believes the Company has sufficient cash and availability under its letter of credit to sustain operations through at least the next 12 months.
	The consolidated financial statements include the accounts of the Company and its wholly owned subsidiaries, Imprivata Securities Corporation and Imprivata International Limited, and its wholly owned subsidiary Imprivata UK Limited. All intercompany balances and transactions have been eliminated in consolidation.
Use of estimates	(c) Use of estimates
	The preparation of the Company’s consolidated financial statements in conformity with U.S. GAAP requires management to make estimates and assumptions that affect the reported amounts of assets and liabilities and disclosure of contingent assets and liabilities at the date of the financial statements and the reported amounts of revenue and expenses during the reporting period. Actual results could differ materially from the Company’s estimates. To the extent that there are material differences between these estimates and actual results, the Company’s financial condition or operating results will be affected. The Company bases its estimates on past experience and other assumptions that the Company believes are reasonable under the circumstances, and the Company evaluates these estimates on an ongoing basis. The most significant estimates relate to the timing and amounts of revenue recognized, deferred tax valuation allowances, valuation of contingent consideration, warranty obligations, uncollectible accounts and stock-based compensation.
Foreign currency	(d) Foreign currency
	The Company’s wholly owned subsidiary, Imprivata International, Inc., had one subsidiary (Imprivata UK Limited) and four branches operational during 2013. In the first quarter of 2014, the Company completed the closure of its UK branch. The subsidiary and branches use the local currency as the functional currency. The Company translates the assets and liabilities of its foreign operations into U.S. dollars based on the rates of exchange in effect as of the balance sheet date. Revenues and expenses are translated into U.S. dollars using average exchange rates for each period. The resulting adjustments from the translation process are included in accumulated other comprehensive (loss) income in the accompanying consolidated balance sheets.
	Certain transactions of the Company are settled in foreign currency, and are thus translated to U.S. dollars at the rate of exchange in effect at the end of each month. Gains (losses) resulting from the translation are included in foreign exchange gains (losses) in the accompanying consolidated statements of operations.
Cash, cash equivalents and restricted cash	(a) Cash, cash equivalents and restricted cash
	Cash and cash equivalents
	The Company considers all highly liquid investments with a remaining maturity of 90 days or less at the date of purchase to be cash and cash equivalents. Cash and cash equivalents consist principally of deposit accounts and money market accounts at December 31, 2014, 2013 and 2012.
	Restricted cash
	During 2013, the Company was informed by the bank holding the LOC that the certificate of deposit was no longer required as collateral for the LOC. The certificate of deposit has been reclassified to cash and cash equivalents in the accompanying consolidated balance sheets and in the cash used in investing activities in the accompanying consolidated statements of cash flows as of December 31, 2013.
Reserve accounts	(b) Reserve accounts
	Allowance for doubtful accounts and sales returns
	The allowance for doubtful accounts and sales returns is the Company’s best estimate of the amount of probable credit losses and returns in the Company’s existing accounts receivable. The Company determines the allowance for doubtful accounts and sales returns based on analysis of historical bad debts, customer concentrations, customer creditworthiness, credit history, return history and current economic trends. The Company reviews its allowances for doubtful accounts and sales returns quarterly. Past due balances over 90 days and specified other balances are reviewed individually for collectability. All other balances are reviewed on an aggregate basis. Account balances are written off against the allowance after all means of collection have been exhausted and the potential for recovery is considered remote. The Company does not sell its software with a right of return; however, the Company allows returns of hardware products in limited circumstances, primarily related to changes in configuration requirements. Significant judgments and estimates are made and used in connection with establishing allowances for doubtful accounts and sales returns in any accounting period and actual results may differ from these judgments and estimates. No significant differences from estimates have been experienced. The Company records adjustments to the allowance for doubtful accounts to general and administrative expense and adjustments to the allowance for sales returns as a reduction of revenue.
	Warranty reserves
	The Company maintains an allowance for warranty obligations that may be incurred under its limited warranty, which includes a hardware warranty of one year. Factors that affect the Company’s allowance for warranty obligations include the number of installed units currently under warranty, historical and anticipated rates of warranty claims on those units, and the cost per claim to satisfy the Company’s warranty obligation.
Property and equipment	(c) Property and equipment
	Property and equipment are recorded at cost. Depreciation and amortization are computed using the straight-line method over the estimated useful lives of the assets, which are three years. Leasehold improvements are amortized over the lesser of the term of the lease or the useful life of the asset. Repairs and maintenance costs are expensed as incurred, whereas major improvements are capitalized as additions to property and equipment.
Business combinations	(d) Business combinations
	The Company allocates the fair value of the purchase consideration of its acquisitions to the tangible assets, liabilities, and intangible assets acquired, including in-process research and development (“IPR&D”), based on their estimated fair values. The excess of the fair value of purchase consideration over the fair values of these identifiable assets and liabilities is recorded as goodwill. IPR&D is initially capitalized at fair value as an intangible asset with an indefinite life and assessed for impairment thereafter. When a project underlying reported IPR&D is completed, the corresponding amount of IPR&D is reclassified as an amortizable purchased intangible asset and is amortized over the asset’s estimated useful life. Acquisition-related expenses are expensed as incurred.
	The allocation of the purchase price requires management to make significant estimates in determining the fair values of assets acquired and liabilities assumed, especially with respect to intangible assets. These estimates are based on information obtained from management of the acquired companies and historical experience. These estimates can include, but are not limited to, the cash flows that an asset is expected to generate in the future, and the cost savings expected to be derived from acquiring an asset. These estimates are inherently uncertain and unpredictable, and if different estimates were used, the purchase price for the acquisition could be allocated to the acquired assets and liabilities differently from the allocation that the Company has made. In addition, unanticipated events and circumstances may occur which may affect the accuracy or validity of such estimates. If such events occur, the Company may be required to record a charge against the value ascribed to an acquired asset or an increase in the amounts recorded for assumed liabilities.
Goodwill and purchased intangible assets	(e) Goodwill and purchased intangible assets
	Goodwill and purchased intangible assets with indefinite lives are not amortized, but tested for impairment on an annual basis in the fourth quarter and more frequently if events or changes in circumstances indicate that the asset may be impaired. The Company’s impairment tests are based on a single operating segment and reporting unit structure.
	In order to determine if Goodwill is impaired, a test is performed. The test involves a two-step process. The first step involves comparing the fair value of the Company’s reporting unit to its carrying value, including goodwill. If the carrying value of the reporting unit exceeds its fair value, the second step of the test is performed by comparing the carrying value of the goodwill in the reporting unit to its implied fair value. An impairment charge is recognized for the excess of the carrying value of goodwill over its implied fair value. There have been no impairment charges recorded.
	In order to determine if indefinite-lived intangible assets are impaired, the Company first performs a qualitative assessment to determine whether it is more likely than not that the asset may be impaired. If the qualitative assessment determines that it is more likely than not that an indefinite-lived intangible asset may be impaired, the quantitative impairment test is performed. The quantitative impairment test for an indefinite-lived intangible asset compares the fair value of the asset with its carrying amount. If the carrying amount of an intangible asset exceeds its fair value, an impairment loss is recognized for the excess. After an impairment loss is recognized, the carrying amount of the intangible asset is adjusted.
	Finite-lived intangible assets are carried at cost and amortized on a straight-line basis over their estimated useful lives, which is four to twelve years. The Company evaluates finite lived intangible assets for impairment by assessing the recoverability of these assets whenever adverse events or changes in circumstances or business climate indicate that expected undiscounted future cash flows related to such intangible assets may not be sufficient to support the net book value of such assets. An impairment charge is recognized in the period of identification to the extent the carrying amount of an asset exceeds the fair value of such asset.
	Significant judgments required in assessing the impairment of goodwill and intangible assets include the identification of reporting units, identifying whether events or changes in circumstances require an impairment assessment, estimating future cash flows, determining appropriate discount and growth rates and other assumptions. Changes in these estimates and assumptions could materially affect the determination of fair value as to whether an impairment exists and, if so, the amount of that impairment.
Long-lived assets	(f) Long-lived assets
	Long-lived assets that are held and used by the Company are reviewed for impairment whenever events or changes in circumstances indicate that the carrying amount of the asset may not be recoverable. When such events occur, the Company compares the carrying amounts of the assets to their undiscounted expected future cash flows. If this comparison indicates that there is impairment, the amount of the impairment is determined as the difference between the carrying value and fair value.
Deferred offering costs	(g) Deferred offering costs
	The Company incurred approximately $3.4 million in costs related to its initial public offering. These offering expenses have been recorded as a reduction of the proceeds received on June 30, 2014, the closing of the Company’s IPO. There are deferred offering costs for the year ended December 31, 2013 of $532,000 included in Other assets in the accompanying balance sheet.
Revenue recognition	(h) Revenue recognition
	The Company derives its revenue primarily from the licensing of software, as well as devices, maintenance and services. Revenue is recognized when persuasive evidence of an arrangement exists, delivery has occurred, the fee is fixed or determinable, and collection is considered probable. Product revenue is recognized upon shipment, assuming all other revenue recognition criteria have been met. Services are considered delivered as the work is performed and maintenance is considered delivered over the contractual maintenance term. The Company has a limited number of customers who purchase our software on a term basis and recognizes these sales ratably over the term.
	Sales of the Company’s software that are sold through resellers are recognized as revenue based on the same criteria as direct sales and upon identification of the end user. For sales through resellers, the reseller assumes the risk of collection from the end user and the Company does not offer a right of return or price protection to any of its resellers.
	When arrangements contain software and non-software elements, the Company allocates the arrangement consideration to the software and non-software elements. The fair value of the elements is determined utilizing vendor-specific objective evidence of fair value, or VSOE, when available, third party evidence or the best estimate of selling price when VSOE of fair value is not determinable. The Company is currently unable to establish VSOE of fair value or third party evidence for our software elements as a group. Therefore the best estimate of selling price for the software elements is determined by considering various factors including but not limited to the Company’s standard software maintenance rates, the historical selling price of these deliverables in similar transactions, and its standard pricing practices along with geographies and customer class. After determining fair value for each deliverable, the arrangement consideration is allocated between the software elements, as a group, and the non-software elements using the relative selling price method. The non-software elements are then recognized upon delivery and when all other revenue recognition criteria are met.
	For software arrangements or elements that contain multiple deliverables where VSOE of fair value exists for all undelivered elements such as maintenance and services, the Company recognizes revenue for the delivered elements using the residual method. VSOE of fair value is determined based upon the price charged when the same element is sold separately. VSOE of fair value of maintenance on user based licenses is based on the price customers are charged when they purchase maintenance separately from other products. Separate sales of maintenance occur when customers make the decision to renew their contracts in years subsequent to the initial maintenance term. The Company analyzes its separate sales based on the “bell-shaped” curve method to ensure that the separate sales are sufficiently concentrated around a specific point and within a narrow enough range to enable a reasonable estimate of fair value. VSOE of fair value of maintenance on enterprise licenses is based on separately stated renewal rates in the arrangement that are substantive.
	For software arrangements containing multiple deliverables where VSOE of fair value does not exist for all undelivered elements, the Company defers revenue for the delivered and undelivered elements until VSOE of fair value is established for the entire undelivered element or all of the elements have been delivered, unless the only undelivered element is delivered over time (e.g., maintenance) where it would record revenue ratably over the delivery period. The Company recognizes maintenance ratably over the term of the maintenance contract, generally 12 months. The Company recognizes revenue allocated to professional service elements, such as installation and training, as the services are performed based on VSOE of fair value for each service performed.
Deferred cost of goods sold	(i) Deferred cost of goods sold
	Deferred costs of goods sold consist primarily of costs associated with physical appliances and devices that were shipped during the period for which the revenue recognition criteria have not yet been met. Deferred costs of goods sold were $78,000 and $459,000 for the years ended December 31, 2014 and 2013, respectively. The costs will be amortized to expense in conjunction with the recognition of the related deferred revenue. These costs are included in prepaid expenses and other current assets on the accompanying balance sheet.
Research and development and software development costs	(j) Research and development and software development costs
	Research and development expenses consist primarily of salary and related expenses for the Company’s research and development staff, including benefits, bonuses and stock-based compensation; the cost of certain third-party contractor costs; and allocated overhead. Expenditures for research and development are expensed as incurred.
	Costs associated with the development of computer software for external sale are expensed prior to the establishment of technological feasibility of the software and capitalized thereafter until commercial release of the software. The Company has not historically incurred significant development costs after the establishment of technological feasibility, and as a result, no software development costs have been capitalized to date.
Shipping and handling costs	(k) Shipping and handling costs
	Shipping and handling costs charged to customers are included in revenue and the associated expense is recorded in cost of products sold in the statements of operations for all periods presented.
Advertising costs	(l) Advertising costs
	Advertising costs are included in sales and marketing expense and are expensed as incurred. Advertising expenses were $194,000, $170,000 and $173,000 for the years ended December 31, 2014, 2013 and 2012, respectively.
Income taxes	(m) Income taxes
	The Company uses the asset and liability method for accounting for income taxes. Under this method, deferred tax assets and liabilities are recorded based on differences between the financial reporting and tax bases of assets and liabilities and for loss and credit carryforwards. The Company measures deferred tax asset and liabilities using the enacted tax rates and laws that will be in effect when the Company expects the differences to reverse. The Company records a valuation allowance to reduce its deferred tax assets to the amount that is more likely than not to be realized. The Company reviews its deferred tax assets for recoverability with consideration for such factors as historical losses, projected future taxable income, prudent and feasible tax planning strategies and the expected timing of the reversals of existing temporary differences. The Company maintains a full valuation allowance against its U.S. net deferred tax assets as a result of the uncertainty regarding the realization of these assets in the future.
	The Company accounts for uncertain tax positions recognized in the consolidated financial statements by prescribing a more-likely-than-not threshold for financial statement recognition and measurement. Interest and penalties associated with such uncertain tax positions are classified as a component of income tax expense. The Company does not have any material unrecognized tax benefits or accrued interest and penalties at December 30, 2014, 2013 or 2012.
Stock-based compensation	(n) Stock-based compensation
	The Company measures compensation cost for equity awards at their fair value. The measurement date for stock awards granted to employees is generally the date of grant. The measurement date for nonemployee awards is the date services are completed or the award is earned. Stock-based compensation is recognized on a straight-line basis over the requisite service period, which generally is the vesting period. The estimation of stock awards that will ultimately vest requires judgment and to the extent that actual results or updated estimates differ from current estimates, such amounts will be recorded as a cumulative adjustment in the period during which estimates are revised. Actual results and future changes in estimates may differ substantially from current estimates. See Note 13 “Stock Award Plans and Stock-based Compensation” for discussion of the Company’s key assumptions included in determining the fair value of its equity awards at grant date.
Recent accounting guidance	(o) Recent accounting guidance
	Accounting standards or updates recently adopted
	Effective January 1, 2014, the Company adopted Accounting Standards Update (“ASU”) No. 2013-11, “Presentation of a Liability for an Unrecognized Tax Benefit When a Net Operating Loss or Tax Credit”. The new guidance provides that a liability related to an unrecognized tax benefit would be presented as a reduction of a deferred tax asset for a net operating loss carryforward, a similar tax loss or a tax credit carryforward if such settlement is required or expected in the event the uncertain tax position is disallowed. The adoption of this update did not have a significant impact on the Company’s consolidated financial statements, as it required only enhanced disclosures.
	Accounting standards or updates not yet effective
	In May 2014, the Financial Accounting Standards Board (“FASB”) issued ASU No. 2014-09, “Revenue from Contracts with Customers” (Topic 606) (ASU 2014-09). ASU 2014-09 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. This new guidance is effective for annual reporting periods (including interim reporting periods within those periods) beginning after December 15, 2016; early adoption is not permitted. Entities have the option of using either a full retrospective or a modified approach to adopt the guidance. This update could impact the timing and amounts of revenue recognized. The Company is currently evaluating the effect that implementation of this update will have on its consolidated financial position and results of operations upon adoption.

Fair_Value_Measurements_Tables

Fair Value Measurements (Tables)	12 Months Ended
	Dec. 31, 2014
Fair Value Disclosures [Abstract]
Assets and Liabilities Measured at Fair Value on Recurring Basis	The following table sets forth the Company’s assets and liabilities which are measured at fair value on a recurring basis by level within the fair value hierarchy:
			December 31, 2014 fair value measurements
	(in thousands)		Level 1			Level 2				Level 3		Total carrying
												value
	Assets
	Cash equivalents:
	Money and market funds		$	33,184								$	33,184
	Certificates of deposit						97						97
	Liabilities
	Contingent consideration										632		632
			December 31, 2013 fair value measurements
	(in thousands)		Level 1			Level 2				Level 3		Total carrying
												value
	Assets
	Cash equivalents:
	Money and market funds		$	8,478								$	8,478
	Certificates of deposit						97						97
	Liabilities
	Contingent consideration			—			—				1,008		1,008
	(c) Assets and liabilities measured on a non-recurring basis
Reconciliation of Contingent Liability Measured at Fair Value	The following table presents a reconciliation of the contingent liability measured at fair value using significant unobservable inputs, and the revaluation amount recorded in the Company’s consolidated statements of operations as a result of the change in fair value:
			Year ended December 31,
	(in thousands)		2014			2013
	Beginning balance		$	1,008		$	1,885
	Revaluation recognized in general and administrative expenses in the corresponding statements of operations			(376	)		(877	)
	Ending balance		$	632		$	1,008
Significant Unobservable Inputs Used in Valuation of Contingent Liability	This following table presents the significant unobservable inputs used in the valuation of the contingent liability:
			Year ended December 31,
			2014			2013		2012
	Discount Rate			17	%	17%-23%(1)			23	%
	-1	The weighted-average discount rate for the year ended December 31, 2013 was 20%

Trade_Accounts_Receivable_Net_1

Trade Accounts Receivable, Net of Allowances (Tables)	12 Months Ended
	Dec. 31, 2014
Receivables [Abstract]
Trade Accounts Receivable, Net	The following table presents the Company’s trade accounts receivable, net:
		December 31,
	(in thousands)	2014			2013
	Trade accounts receivable	$	25,695		$	20,015
	Allowance for doubtful accounts		(161	)		(161	)
	Allowance for sales returns		(199	)		(100	)
	Total allowance		(360	)		(261	)
	Trade accounts receivable, net	$	25,335		$	19,754
Allowances for Doubtful Accounts and Credit Memos	The allowances for doubtful accounts and credit memos are summarized as follows:
	(in thousands)	Balance at			Increases			Balance at
		beginning			in reserves			end of period
		of period
	Allowance for doubtful accounts
	Year ended December 31, 2014	$	161			0		$	161
	Year ended December 31, 2013	$	100			61		$	161
	Year ended December 31, 2012	$	16			84		$	100
	(in thousands)	Balance at			Increase			Write-off /			Balance at
		beginning			in reserves			adjustments			end of period
		of period
	Allowance for sales returns
	Year ended December 31, 2014	$	100			99			0		$	199
	Year ended December 31, 2013	$	100			53			(53	)	$	100
	Year ended December 31, 2012	$	—			100			—		$	100

Property_and_Equipment_Tables

Property and Equipment (Tables)	12 Months Ended
	Dec. 31, 2014
Property, Plant and Equipment [Abstract]
Schedule of Property and Equipment	Property and equipment consisted of the following:
		Estimated
		useful life		December 31,
	(in thousands)	(years)		2014			2013
	Computer equipment an purchased software		3	$	4,397		$	3,525
	Furniture and fixtures		3		2,440			1,637
	Leasehold improvements		Shorter of		5,357			4,119
			useful life or
			lease term
	Construction in progress		—		—			243
	Total				12,194			9,524
	Less accumulated depreciation				(4,554	)		(2,842	)
	Property and equipment, net			$	7,640		$	6,682

Goodwill_and_Purchased_Intangi1

Goodwill and Purchased Intangible Assets (Tables)	12 Months Ended
	Dec. 31, 2014
Goodwill and Intangible Assets Disclosure [Abstract]
Schedule of Intangible Assets	The following table present details of the Company’s intangible assets acquired through business combinations:
	(in thousands)	Gross		Accumulated			Net
				amortization
	December 31, 2014
	Purchased intangible assets with finite lives:
	Intellectual Property	$	3,854	$	(2,374	)	$	1,480
	Trade Name		27		(8	)		19
	Total		3,881		(2,382	)		1,499
	December 31, 2013
	Purchased intangible assets with finite lives:
	Intellectual Property	$	3,854	$	(1,876	)	$	1,978
	Trade Name		27		(5	)		22
	Total	$	3,881	$	(1,881	)	$	2,000
Schedule of Amortization Expense of Purchased Intangible Assets	The following table presents the amortization expense of purchased intangible assets:
		Year ended, December 31,
	(in thousands)	2014		2013			2012
	Amortization of purchased intangible assets
	Cost of sales	$	223	$	242		$	159
	Operating expenses:
	General and administrative		278		279			279
	Total	$	501	$	521		$	438
Schedule of Amortization Expense of Purchased Intangible Assets with Finite Lives	The estimated future amortization expense of purchased intangible assets with finite lives as of December 31, 2014 is as follows:
	(in thousands)	Amount
	2015	$	370
	2016		370
	2017		370
	2018		230
	2019		91
	2020		68
	Total	$	1,499

Accrued_Expenses_and_Other_Cur1

Accrued Expenses and Other Current Liabilities (Tables)	12 Months Ended
	Dec. 31, 2014
Payables and Accruals [Abstract]
Summary of Accrued Expenses and Other Current Liabilities	The following table presents the details of the Company’s accrued expenses and other current liabilities:
			December 31,
	(in thousands)		2014		2013
	Accrued payroll and related		$	7,839	$	5,442
	Accrued taxes(1)			1,144		783
	Other accrued expenses			1,582		2,924
			$	10,565	$	9,149
	-1	Accrued taxes consist of accruals for foreign and state taxes, sales and use taxes, value added taxes due in foreign jurisdictions and franchise taxes.

Warranty_Obligations_Tables

Warranty Obligations (Tables)	12 Months Ended
	Dec. 31, 2014
Guarantees [Abstract]
Summary of Allowance for Warranty Obligations	The following table presents the details of the Company’s allowance for warranty obligations:
		December 31,
	(in thousands)	2014			2013
	Beginning balance	$	93		$	93
	Provision for estimated claims		5			21
	Adjustment to estimate		(51	)		—
	Settlement of claims		(7	)		(21	)
	Ending balance	$	40		$	93

Debt_Tables

Debt (Tables)	12 Months Ended
	Dec. 31, 2014
Debt Disclosure [Abstract]
Summary of Future Principal and Interest Payments Under the Capital Lease Obligations	The future principal and interest payments under the capital lease obligations are as follows:
	(in thousands)	December 31,
		2014
	2015	$	453
	2016		373
	2017		194
	2018		6
	Total	$	1,026
	Less: interest		(49	)
	Total principal payments		977
	Less: current portion		(440	)
	Long-term portion	$	537
	Interest paid during the period	$	35
Summary of Term Loan Associated with Licenses and Maintenance	The following table outlines the Company’s term loans associated with the licenses and maintenance:
								December 31,
	(in thousands)	Term			Interest			2014			2013
		(in years)			Rate
	Balance-Beginning of Period							$	142		$	274
	Borrowings:
	Jan-14		2.5			6.5	%		387			—
	Principal Payments								(262	)		(132	)
	Balance- End of Period							$	267		$	142
	Reported as:
	Current								185			113
	Long-term								82			29
	Total							$	267		$	142
	Interest paid during the period							$	24		$	17
Schedule of Future Principal and Interest Payments Under the Term Loan	The future principal and interest payments under the term loan are as follows:
	(in thousands)	December 31,
		2014
	2015	$	197
	2016		84
	Total	$	281
	Less: interest		(14	)
	Total principal payments	$	267

Commitments_and_Contingencies_

Commitments and Contingencies (Tables)	12 Months Ended
	Dec. 31, 2014
Commitments and Contingencies Disclosure [Abstract]
Schedule of Future Minimum Lease Payments Under Operating Lease Agreements	The future minimum lease payments under all operating lease agreements at December 31, 2014 are as follows:
	(in thousands)	Facility		Other		Total
		leases		operating
				leases
	2015	$	1,993	$	27	$	2,020
	2016		1,883		—		1,883
	2017		1,928		—		1,928
	2018		1,973		—		1,973
	2019		1,425		—		1,425
	Total	$	9,202	$	27	$	9,229

Redeemable_Convertible_Preferr1

Redeemable Convertible Preferred Stock and Stockholders' Equity (Deficit) (Tables)	12 Months Ended
	Dec. 31, 2014
Equity [Abstract]
Summary of Changes in Redeemable Convertible Preferred Stock	The changes in redeemable convertible preferred stock were as follows:
	(in thousands)		Series				Amount				Series				Amount				Series			Amount			Total			Amount
			A								B								C						Shares
			Shares								Shares								Shares
	Balance at January 1, 2013			11,200			$	43,806				5,438			$	20,300				4,318		$	22,549			20,956		$	86,655
	Accretion of redeemable convertible preferred stock to redemption value							2,250								1,200							1,502						4,952
	Balance at December 31, 2013			11,200				46,056				5,438				21,500				4,318			24,051			20,956			91,607
	Accretion of redeemable convertible preferred stock to redemption value							1,109								592							741						2,442
	Conversion of preferred stock into common stock			(11,200	)			(47,165	)			(5,438	)			(22,092	)			(4,318	)		(24,792	)		(20,956	)		(94,049	)
	Balance at December 31, 2014			—			$	—				—			$	—				—		$	—			—		$	—
Schedule of Redeemable Convertible Preferred Stock and Stockholders' Deficit	The following table summarizes the redeemable convertible preferred stock authorized, issued and outstanding at December 31, 2013:
	(in thousands, except price and		Date of Issuance		Price				Shares				Proceeds				Aggregated
	share data)								Authorized,								Liquidation
									Issued and								Preference
									Outstanding
	Series A		February 2002(1) - April 2005		$	2.0089				11,200,158			$	22,500			$	22,500
	Series B		Jan-06		$	2.2065				5,438,478				12,000				12,000
	Series C		December 2007 - March 2008		$	3.474				4,317,790				15,000				15,000
	Total									20,956,426			$	49,500			$	49,500
	-1	The financing was closed in two rounds, the first on February 22, 2002, for proceeds of $6.0 million, and the second on December 19, 2002, for proceeds of $7.5 million.
Schedule of Changes in Accumulated Other Comprehensive Income Before Taxes	The following table presents the changes in accumulated other comprehensive income before taxes, as the tax effect is not material to the consolidated financial statements:
	(in thousands)		Foreign				Affected line item in the
			Currency				statement where net
			Translation				income is presented
			Adjustments
	Balance at January 1, 2013		$	(42	)
	Other comprehensive income			(108	)
	Amounts reclassified from accumulated other comprehensive income:
	Closure of foreign branches			5			Other income (expense)
	Net current-period other comprehensive loss			(103	)
	Balance at December 31, 2013			(145	)
	Other comprehensive income			(100	)
	Amounts reclassified from accumulated other comprehensive income:
	Closure of foreign branch			145			Other income (expense)
	Net current-period other comprehensive loss			45
	Balance at December 31, 2014		$	(100	)

Stock_Award_Plans_and_Stock_Ba1

Stock Award Plans and Stock Based Compensation (Tables)	12 Months Ended
	Dec. 31, 2014
Disclosure of Compensation Related Costs, Share-based Payments [Abstract]
Schedule of Estimated Weighted-Average Assumptions Used in Calculation of Fair Value of Options Granted and Rights to Acquire Stock Under ESPP	Weighted average assumptions used to apply this model were as follows:
			Year ended December 31,
			2014			2013			2012
	Risk-free interest rate(1)			1.88	%		1.49	%		0.87	%
	Expected term (years)(2)			6.04			6.03			6.02
	Expected dividend yield(3)			—	%		—	%		—	%
	Expected volatility of underlying stock(4)			54	%		52	%		46	%
	Weighted average assumptions used to estimate the fair value of the rights to acquire stock under the ESPP plan during the initial offering period were as follows:
			Year ended
			December 31,
			2014
	Risk-free interest rate(1)			0.08	%
	Expected term (years)(2)			0.68
	Expected dividend yield(3)			—	%
	Expected volatility of underlying stock(4)			40	%
	-1	Risk-free interest rate—the yield on zero-coupon U.S. Treasury securities with maturities similar to the expected term of the award being valued is used as the risk-free interest rate.
	-2	Expected term—the expected term for stock options granted based on a review of the period that the Company’s stock option awards are expected to be outstanding and is calculated using the simplified method, which represents the average of the contractual term of the options and the weighted-average vesting period of the options. The Company uses the simplified method because it does not have sufficient historical option exercise data to provide a reasonable basis upon which to estimate the expected term.
	-3	Expected dividend yield—the expected dividend yield was not considered in the option pricing formula since the Company has not declared dividends and does not expect to pay dividends in the foreseeable future.
	-4	Expected volatility—the Company is responsible for estimating volatility. The Company has been a private company and does not have relevant historical data to develop its volatility assumptions and, therefore, analyzed the volatility of several public peer companies to support the assumptions used in its calculations for the periods presented.
Schedule of Stock-Based Compensation Expense	Stock-based compensation included in costs and operating expenses related to the awards of stock options and the employee stock purchase plan are as follows:
			Year ended December 31,
	(in thousands)		2014			2013			2012
	Cost of maintenance and professional services		$	138		$	50		$	7
	Research and development			500			263			207
	Sales and marketing			532			137			171
	General and administrative			442			190			65
	Total		$	1,612		$	640		$	450
Schedule of Stock Option Activity	Stock option activity is as follows:
	(in thousands, except per share data)		Number			Weighted			Weighted			Aggregate
			of			average			average			intrinsic
			shares			exercise			remaining			value
						price			contractual
									life (in
									years)
	Outstanding, January 1, 2013			3,477		$	1.55					$	10,737
	Granted			993			6.8
	Exercised			(530	)		1.73
	Forfeited			(133	)		3.14
	Expired			(30	)		0.32
	Outstanding, December 31, 2013			3,777		$	2.86					$	23,491
	Granted			332			12.95
	Exercised			(302	)		1.58
	Forfeited			(77	)		4.61
	Expired			(21	)		0.74
	Outstanding December 31, 2014			3,709		$	3.84			6.04		$	34,206
	Exercisable, December 31,2014			2,961		$	2.63			5.36		$	30,697
	Vested or expected to vest, December 31, 2014			3,615		$	3.73			5.97		$	33,733
Summary of Information Relating to Options Granted and Exercised	The following table summarizes information relating to options granted and exercised:
			Year ended December 31,
	(in thousands, except per share data)		2014			2013			2012
	Weighted average fair value per share of options granted		$	6.75		$	3.43		$	1.4
	Aggregate intrinsic value of options exercised		$	2,989		$	1,685		$	1,007
	Fair value of options vested		$	1,338		$	553		$	540
	Cash proceeds received upon exercise		$	476		$	916		$	436

Income_Taxes_Tables

Income Taxes (Tables)	12 Months Ended
	Dec. 31, 2014
Income Tax Disclosure [Abstract]
Schedule of (Loss) Income Before Provision for Income Taxes	(Loss) income before the provision for income taxes consists of the following:
		December 31,
	(in thousands)	2014			2013			2012
	United States	$	(16,913	)	$	(5,838	)	$	816
	Foreign		346			423			341
	Total	$	(16,567	)	$	(5,415	)	$	1,157
Summary of Provisions for Income Taxes	The provision for income taxes in the accompanying consolidated financial statements consists of the following:
		December 31,
	(in thousands)	2014			2013			2012
	Current income tax provision:
	Federal	$	—		$	—		$	—
	State		40			—			13
	Foreign		129			108			96
	Total current income tax provision		169			108			109
	Deferred income tax provision:
	Federal		—			—			—
	State		—			—			—
	Foreign		—			—			—
	Total deferred income tax provision		—			—			—
	Total income tax provision	$	169		$	108		$	109
Reconciliation of Federal Income Tax Rate	A reconciliation of the U.S. statutory tax rate to the Company’s effective tax rate is as follows:
		December 31,
		2014			2013			2012
	Tax due at statutory rate		34	%		34	%		34	%
	State income taxes, net of federal tax benefit		(0.2	%)		—	%		1.1	%
	Foreign income taxes		0.3	%		(0.9	%)		8	%
	Meals & entertainment		(0.4	%)		(1.1	%)		13.5	%
	Stock compensation		(2.1	%)		(1.9	%)		4.6	%
	Fines & penalties		—	%		(0.3	%)		1.2	%
	Tax credits		7.3	%		26.8	%		(17.3	%)
	Change in valuation allowance		(39.9	%)		(58.5	%)		(36.0	%)
	Effective tax rate		(1.0	%)		(1.9	%)		9.1	%
Schedule of Deferred Tax Assets (Liabilities)	Net deferred tax assets (liabilities) consisted of the following:
		December 31,
	(in thousands)	2014			2013
	Net operating loss carryforwards	$	18,235		$	11,919
	Tax credit carryforwards		5,134			3,814
	Start-up and research and development capitalized expenditures		1,806			2,674
	Deferred revenue		1,325			1,590
	Other temporary differences		1,858			3,297
	Gross deferred assets		28,358			23,294
	Valuation allowance		(27,490	)		(21,410	)
	Deferred tax assets, net		868			1,884
	Depreciation		(333	)		(1,463	)
	Other temporary differences		(535	)		(421	)
	Gross deferred tax liabilities		(868	)		(1,884	)
	Net deferred tax asset (liability)	$	—		$	—

Computation_of_Net_Loss_Per_Sh1

Computation of Net Loss Per Share (Tables)	12 Months Ended
	Dec. 31, 2014
Earnings Per Share [Abstract]
Summary of Components of Net Loss per Share	The components of net loss per share are as follows:
		For the Year Ended December 31,
	(in thousands, except per share data)	2014			2013			2012
	Numerator:
	Net (loss) income	$	(16,736	)	$	(5,523	)	$	1,048
	Accretion of preferred stock		(2,442	)		(4,952	)		(4,957	)
	Net loss attributable to common stockholders		(19,178	)		(10,475	)		(3,909	)
	Denominator:
	Weighted average common shares outstanding used in computing basic and diluted net loss per common share		13,950			3,359			2,868
	Net loss per share, basic and diluted	$	(1.37	)	$	(3.12	)	$	(1.36	)
Summary of Common Stock Equivalents Excluded from Computation of Diluted Net Loss per Share	The following common stock equivalents were excluded from the computation of diluted net loss per share attributable to common stockholders because they had an antidilutive impact:
		For the Year Ended December 31,
	(in thousands)	2014			2013			2012
	Options to purchase common stock		3,709			3,777			3,477
	Common stock subject to repurchase		40			63			—
	Warrants		—			120			120
	Convertible preferred stock		—			13,971			13,971
	Total		3,749			17,931			17,568

Segment_and_Geographic_Informa1

Segment and Geographic Information (Tables)	12 Months Ended
	Dec. 31, 2014
Segment Reporting [Abstract]
Schedule of Derived Revenues	The Company derived its revenues from the following geographic areas:
		Year ended December 31,
	(in thousands)	2014		2013		2012
	United States	$	76,159	$	56,371	$	42,269
	United Kingdom		5,241		4,093		3,813
	Rest of world		15,579		10,647		7,942
	Total	$	96,979	$	71,111	$	54,024
Summary of Long lived Assets Related to Segment Information	Long-lived assets related to the Company’s U.S. and international operations were as follows:
		December 31,
	(in thousands)	2014		2013
	United States	$	7,562	$	6,546
	United Kingdom		78		136
	Rest of world		—		—
	Total	$	7,640	$	6,682

Quarterly_Financial_Informatio1

Quarterly Financial Information (Unaudited) (Tables)	12 Months Ended
	Dec. 31, 2014
Quarterly Financial Information Disclosure [Abstract]
Quarterly Financial Information	Three months ended
	(in thousands)		Dec. 31,			Sept. 30,			June 30,			March 31,
			2014			2014			2014			2014
	Revenues		$	29,028		$	25,278		$	23,233		$	19,440
	Gross profit			20,908			16,638			16,358			13,087
	Net loss			(1,663	)		(4,454	)		(3,552	)		(7,067	)
	Net loss attributable to common shareholders, basic and diluted (1)(2)		$	(0.07	)	$	(0.19	)	$	(1.08	)	$	(2.29	)
			Three months ended
			Dec. 31,			Sept. 30,			June 30,			March 31,
			2013			2013			2013			2013
	Revenues		$	21,634		$	17,907		$	17,315		$	14,255
	Gross profit			15,213			13,375			13,214			10,440
	Net loss			(3,259	)		(650	)		(84	)		(1,530	)
	Net loss attributable to common shareholders, basic and diluted (1)(2)		$	(1.26	)	$	(0.54	)	$	(0.41	)	$	(0.59	)
	-1	Net loss attributable to common shareholders includes accretion of preferred stock for all periods presented through the IPO closing date of June 30, 2014.
	-2	Net loss per share for the four quarters of each fiscal year may not sum to the total for the fiscal year due to the different number of shares outstanding during each period.

Organization_and_business_Addi

Organization and business - Additional Information (Detail)	12 Months Ended
	Dec. 31, 2014	Dec. 31, 2013
		Subsidiary
		Branches
Organization, Consolidation and Presentation of Financial Statements [Abstract]
Incorporated state	Delaware
Month and Year of incorporation	2001-05
Cash availability, term	12 months
Number of subsidiary		1
Number of branches		4

Summary_of_Significant_Account1

Summary of Significant Accounting Policies - Additional Information (Detail) (USD $)	12 Months Ended
	Dec. 31, 2014	Dec. 31, 2013	Dec. 31, 2012
Schedule Of Summary Of Significant Accounting Policies [Line Items]
Due day of allowances for doubtful accounts	90 days
Warranty period of hardware	1 year
Estimated useful lives of assets	3 years
Impairment charges recorded for goodwill	$0
Deferred cost of goods sold	78,000	459,000
Advertising expenses	194,000	170,000	173,000
Initial Public Offering [Member]
Schedule Of Summary Of Significant Accounting Policies [Line Items]
Cost relate initial public offering	$3,400,000	$532,000
Minimum [Member]
Schedule Of Summary Of Significant Accounting Policies [Line Items]
Period of finite-lived intangible assets	4 years
Maximum [Member]
Schedule Of Summary Of Significant Accounting Policies [Line Items]
Period of finite-lived intangible assets	12 years

Fair_value_measurements_Assets

Fair value measurements - Assets and Liabilities Measured at Fair Value on Recurring Basis (Detail) (USD $)	Dec. 31, 2014	Dec. 31, 2013
In Thousands, unless otherwise specified
Money Market Funds [Member]
Assets
Cash equivalents fair value on a recurring	$33,184	$8,478
Certificates of Deposit [Member]
Assets
Cash equivalents fair value on a recurring	97	97
Contingent Consideration [Member]
Liabilities
Contingent consideration	632	1,008
Level 1 [Member] | Money Market Funds [Member]
Assets
Cash equivalents fair value on a recurring	33,184	8,478
Level 2 [Member] | Certificates of Deposit [Member]
Assets
Cash equivalents fair value on a recurring	97	97
Level 3 [Member] | Contingent Consideration [Member]
Liabilities
Contingent consideration	$632	$1,008

Fair_value_measurements_Additi

Fair value measurements - Additional Information (Detail) (USD $)	Dec. 31, 2014	Dec. 31, 2013	Dec. 31, 2012
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Contingent liability	$632,000	$1,000,000
Fair Value, Measurements, Non-recurring [Member]
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Fair value measurements on a non-recurring basis	0	0	0
Validus Medical Systems [Member]
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Contingent liability	$9,800,000

Fair_value_measurements_Reconc

Fair value measurements - Reconciliation of Contingent Liability Measured at Fair Value (Detail) (USD $)	12 Months Ended
In Thousands, unless otherwise specified	Dec. 31, 2014	Dec. 31, 2013
Business Acquisition, Contingent Consideration [Line Items]
Ending balance	$632	$1,000
Level 3 [Member]
Business Acquisition, Contingent Consideration [Line Items]
Beginning balance	1,008	1,885
Revaluation recognized in general and administrative expenses in the corresponding statements of operations	-376	-877
Ending balance	$632	$1,008

Fair_value_measurements_Signif

Fair value measurements - Significant Unobservable Inputs Used in Valuation of Contingent Liability (Detail)	12 Months Ended
	Dec. 31, 2013	Dec. 31, 2014	Dec. 31, 2012
Fair Value Inputs, Assets, Quantitative Information [Line Items]
Discount Rate	20.00%
Level 3 [Member]
Fair Value Inputs, Assets, Quantitative Information [Line Items]
Discount Rate		17.00%	23.00%
Level 3 [Member] | Minimum [Member]
Fair Value Inputs, Assets, Quantitative Information [Line Items]
Discount Rate	17.00%
Level 3 [Member] | Maximum [Member]
Fair Value Inputs, Assets, Quantitative Information [Line Items]
Discount Rate	23.00%

Fair_value_measurements_Signif1

Fair value measurements - Significant Unobservable Inputs Used in Valuation of Contingent Liability (Parenthetical) (Detail)	12 Months Ended
	Dec. 31, 2013
Debt Instrument Fair Value Carrying Value [Abstract]
Weighted-average discount rate	20.00%

Trade_Accounts_Receivable_Net_2

Trade Accounts Receivable, Net of Allowances - Trade Accounts Receivable, Net (Detail) (USD $)	12 Months Ended
In Thousands, unless otherwise specified	Dec. 31, 2014	Dec. 31, 2013	Dec. 31, 2012	Dec. 31, 2011
Accounts, Notes, Loans and Financing Receivable [Line Items]
Allowance for doubtful accounts	($161)	($161)	($100)	($16)
Trade Accounts Receivable [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Trade accounts receivable	25,695	20,015
Allowance for doubtful accounts	-161	-161
Allowance for sales returns	-199	-100
Total allowance	-360	-261
Trade accounts receivable, net	$25,335	$19,754

Trade_Accounts_Receivable_Net_3

Trade Accounts Receivable, Net of Allowances - Allowances for Doubtful Accounts and Credit Memos (Detail) (USD $)	12 Months Ended
In Thousands, unless otherwise specified	Dec. 31, 2014	Dec. 31, 2013	Dec. 31, 2012
Receivables [Abstract]
Allowance for doubtful accounts, Balance at beginning of period	$161	$100	$16
Allowance for doubtful accounts, Increases in reserves		61	84
Allowance for doubtful accounts, Balance at end of period	161	161	100
Allowance for sales returns, Balance at beginning of period	100	100
Allowance for sales returns, Increase in reserves	99	53	100
Allowance for sales returns, Write-off / adjustments		-53
Allowance for sales returns, Balance at end of period	$199	$100	$100

Property_and_Equipment_Schedul

Property and Equipment - Schedule of Property and Equipment (Detail) (USD $)	12 Months Ended
In Thousands, unless otherwise specified	Dec. 31, 2014	Dec. 31, 2013
Property, Plant and Equipment [Line Items]
Property and equipment,gross	$12,194	$9,524
Less accumulated depreciation	-4,554	-2,842
Property and equipment, net	7,640	6,682
Estimated useful life	3 years
Computer Equipment [Member]
Property, Plant and Equipment [Line Items]
Property and equipment,gross	4,397	3,525
Estimated useful life	3 years
Furniture and Fixtures [Member]
Property, Plant and Equipment [Line Items]
Property and equipment,gross	2,440	1,637
Estimated useful life	3 years
Leasehold Improvements [Member]
Property, Plant and Equipment [Line Items]
Property and equipment,gross	5,357	4,119
Estimated useful life	Shorter of useful life or lease term
Construction in Progress [Member]
Property, Plant and Equipment [Line Items]
Property and equipment,gross	$0	$243

Property_and_Equipment_Additio

Property and Equipment - Additional Information (Detail) (USD $)	12 Months Ended
	Dec. 31, 2014	Dec. 31, 2013	Dec. 31, 2012
Property, Plant and Equipment [Abstract]
Depreciation expense	$2,600,000	$1,900,000	$645,000

Goodwill_and_Purchased_Intangi2

Goodwill and Purchased Intangible Assets - Additional Information (Detail) (USD $)	12 Months Ended
	Dec. 31, 2014	Dec. 31, 2013	Dec. 31, 2012
Finite-Lived Intangible Assets [Line Items]
Value of goodwill acquired	$1,560,000	$1,560,000
Annual impairment charges	0	0	0
Validus Medical Systems [Member]
Finite-Lived Intangible Assets [Line Items]
Value of goodwill acquired	1,600,000	1,600,000
Impairment charges for finite and indefinite-lived intangible assets	$0	$0	$0

Goodwill_and_Purchased_Intangi3

Goodwill and Purchased Intangible Assets - Schedule of Intangible Assets (Detail) (USD $)	Dec. 31, 2014	Dec. 31, 2013
In Thousands, unless otherwise specified
Finite-Lived Intangible Assets [Line Items]
Gross	$3,881	$3,881
Accumulated amortization	-2,382	-1,881
Net	1,499	2,000
Intellectual Property [Member]
Finite-Lived Intangible Assets [Line Items]
Gross	3,854	3,854
Accumulated amortization	-2,374	-1,876
Net	1,480	1,978
Trade Name [Member]
Finite-Lived Intangible Assets [Line Items]
Gross	27	27
Accumulated amortization	-8	-5
Net	$19	$22

Goodwill_and_Purchased_Intangi4

Goodwill and Purchased Intangible Assets - Schedule of Amortization Expense of Purchased Intangible Assets (Detail) (USD $)	12 Months Ended
In Thousands, unless otherwise specified	Dec. 31, 2014	Dec. 31, 2013	Dec. 31, 2012
Finite-Lived Intangible Assets [Line Items]
Amortization of purchased intangible assets	$501	$521	$438
Cost of Sales [Member]
Finite-Lived Intangible Assets [Line Items]
Amortization of purchased intangible assets	223	242	159
General and Administrative [Member]
Finite-Lived Intangible Assets [Line Items]
Amortization of purchased intangible assets	$278	$279	$279

Goodwill_and_Purchased_Intangi5

Goodwill and Purchased Intangible Assets - Schedule of Amortization Expense of Purchased Intangible Assets with Finite Lives (Detail) (USD $)	Dec. 31, 2014	Dec. 31, 2013
In Thousands, unless otherwise specified
Goodwill and Intangible Assets Disclosure [Abstract]
2015	$370
2016	370
2017	370
2018	230
2019	91
2020	68
Net	$1,499	$2,000

Accrued_Expenses_and_Other_Cur2

Accrued Expenses and Other Current Liabilities - Summary of Accrued Expenses and Other Current Liabilities (Detail) (USD $)	Dec. 31, 2014	Dec. 31, 2013
In Thousands, unless otherwise specified
Payables and Accruals [Abstract]
Accrued payroll and related	$7,839	$5,442
Accrued taxes	1,144	783
Other accrued expenses	1,582	2,924
Total	$10,565	$9,149

Warranty_Obligations_Summary_o

Warranty Obligations - Summary of Allowance for Warranty Obligations (Detail) (USD $)	12 Months Ended
In Thousands, unless otherwise specified	Dec. 31, 2014	Dec. 31, 2013
Guarantees [Abstract]
Beginning balance	$93	$93
Provision for estimated claims	5	21
Adjustment to estimate	-51
Settlement of claims	-7	-21
Ending balance	$40	$93

Debt_Additional_Information_De

Debt - Additional Information (Detail) (USD $)	12 Months Ended
	Dec. 31, 2014	Dec. 31, 2013	Dec. 31, 2012
Line of Credit Facility [Line Items]
Maturity date description	In February 2015, the Company amended its revolving credit facility to extend the maturity through April 2015. The revolving credit facility was set to expire in February 2015.
Assets under capital lease obligations	$1,500,000	$789,000
Accumulated depreciation of leased assets	721,000	276,000
Depreciation expense associated with capital leases	2,600,000	1,900,000	645,000
Minimum [Member]
Line of Credit Facility [Line Items]
Capital lease interest rate	1.50%
Maximum [Member]
Line of Credit Facility [Line Items]
Capital lease interest rate	8.40%
Revolving Credit Facility [Member]
Line of Credit Facility [Line Items]
Credit facility maturity date	28-Feb-15
Borrowings on accounts receivable	10,000,000
Outstanding borrowings, interest rate	0.75%
Outstanding borrowings, interest rate, description	Prime rate plus 0.75%
Extended maturity date for the debt instrument	30-Apr-15
Maturity date for the debt instrument	28-Feb-15
Outstanding revolving credit facility	0	0
Capital Leases [Member]
Line of Credit Facility [Line Items]
Depreciation expense associated with capital leases	$443,000	$258,000	$56,000

Debt_Summary_of_Future_Princip

Debt - Summary of Future Principal and Interest Payments Under the Capital Lease Obligations (Detail) (USD $)	12 Months Ended
In Thousands, unless otherwise specified	Dec. 31, 2014
Capital Leases, Future Minimum Payments Due, Rolling Maturity [Abstract]
2015	$453
2016	373
2017	194
2018	6
Total	1,026
Less: interest	-49
Total principal payments	977
Less: current portion	-440
Long-term portion	537
Interest paid during the period	$35

Debt_Summary_of_Term_Loan_Asso

Debt - Summary of Term Loan Associated with Licenses and Maintenance (Detail) (USD $)	12 Months Ended
	Dec. 31, 2014	Dec. 31, 2013	Dec. 31, 2007
Debt Instrument [Line Items]
Borrowings: January 2014			$50,000
Reported as: Current	288,000	249,000
Term Loans [Member]
Debt Instrument [Line Items]
Balance-Beginning of Period	142,000	274,000
Borrowings: January 2014	387,000
Principal Payments	-262,000	-132,000
Balance- End of Period	267,000	142,000
Reported as: Current	185,000	113,000
Reported as: Long-term	82,000	29,000
Total	267,000	142,000
Interest paid during the period	$24,000	$17,000
Term (in years)	2 years 6 months
Interest Rate	6.50%

Debt_Schedule_of_Future_Princi

Debt - Schedule of Future Principal and Interest Payments Under the Term Loan (Detail) (Term Loans [Member], USD $)	Dec. 31, 2014	Dec. 31, 2013	Dec. 31, 2012
In Thousands, unless otherwise specified
Term Loans [Member]
Debt Instrument [Line Items]
2015	$197
2016	84
Total	281
Total	281
Less: interest	-14
Total principal payments	$267	$142	$274

Commitments_and_Contingencies_1

Commitments and Contingencies - Additional Information (Detail) (USD $)	3 Months Ended			12 Months Ended			0 Months Ended	1 Months Ended
	Jun. 30, 2014	Mar. 31, 2013	Dec. 31, 2012	Dec. 31, 2014	Dec. 31, 2013	Dec. 31, 2012	Jan. 16, 2015	Sep. 30, 2013
								sqft
Leases Disclosure [Line Items]
Tenant reimbursement from landlord for leased premises	$218,000	$198,000	$1,500,000	$1,900,000
Rent expense				2,100,000	1,400,000	876,000
Amortization expense related to tenant improvement liability				278,000	249,000	21,000
Subsequent Event [Member]
Leases Disclosure [Line Items]
Additional rent expense							7,900,000
Landlord contribution for leasehold improvement							$735,000
Lease agreement amendment							16-Jan-15
Santa Cruz County California [Member]
Leases Disclosure [Line Items]
Operating lease termination period				36 months
Operating lease office space								8,500
Operating lease termination year				2018
England [Member]
Leases Disclosure [Line Items]
Operating lease office space square feet					4,200
Operating lease termination year				2015
Massachusetts [Member] | Subsequent Event [Member]
Leases Disclosure [Line Items]
Operating lease office space square feet							93,000
Massachusetts [Member] | Subsequent Event [Member] | Amendment To Lease Agreement [Member]
Leases Disclosure [Line Items]
Operating lease office space square feet							21,000
Maximum [Member] | Massachusetts [Member]
Leases Disclosure [Line Items]
Operating lease termination period				7 years
Operating lease office space square feet				72,000
Minimum [Member] | Massachusetts [Member]
Leases Disclosure [Line Items]
Operating lease termination period				60 months
Operating lease office space square feet				60,000

Commitments_and_Contingencies_2

Commitments and Contingencies - Schedule of Future Minimum Lease Payments under Operating Lease Agreements (Detail) (USD $)	Dec. 31, 2014
In Thousands, unless otherwise specified
Operating Leases Future Minimum Payments Due [Line Items]
2015	$2,020
2016	1,883
2017	1,928
2018	1,973
2019	1,425
Total	9,229
Facility Leases [Member]
Operating Leases Future Minimum Payments Due [Line Items]
2015	1,993
2016	1,883
2017	1,928
2018	1,973
2019	1,425
Total	9,202
Other Operating Leases [Member]
Operating Leases Future Minimum Payments Due [Line Items]
2015	27
Total	$27

Redeemable_Convertible_Preferr2

Redeemable Convertible Preferred Stock and Stockholders' Equity (Deficit) - Additional Information (Detail) (USD $)	0 Months Ended		1 Months Ended	12 Months Ended	1 Months Ended
	31-May-14	Mar. 31, 2014	31-May-14	Dec. 31, 2014	Jun. 30, 2014	Dec. 31, 2013
Temporary Equity [Line Items]
Common stock, authorized				250,000,000		32,867,000
Undesignated preferred stock, authorized				20,000,000		20,956,426
Shares reserved, exercise of stock options				3,709,156
Preferred stock shares outstanding						20,956,426
Dividends declared on preferred stock		$0
Description on conversion of preferred stock				Preferred Stock shall automatically convert into common stock, at the then-applicable conversion rates, upon (1) the closing of a firm commitment underwritten initial public offering of the common stock in which the price per share to the public is at least three times the highest then-applicable conversion price of any shares of Preferred Stock or (2) written notice from the holders of at least 75% in voting power of the then-outstanding shares of Preferred Stock.
Preferred stock redemption date description				On February 26, 2014, the holders of the Company's Preferred Stock extended the redemption date from December 11, 2014, to any time on or after December 31, 2015.
Percentage added to redemption price				10.00%
Mergers and consolidations involving change in ownership of voting control				50.00%
Reverse stock split conversion ratio	1.5
Reverse stock split, description	In May 2014, the Company's Board of Directors approved a 1-for-1.5 reverse stock split of the Company's common stock. The reverse stock split became effective on May 30, 2014.
Aggregate shares of common stock upon the net exercise of warrants			108,853
Aggregate shares of common stock, exercisable			120,000
Warrants, exercise price	$1.10		$1.10
Aggregate shares of common stock issuable upon exercise, warrants were forfeited			11,147
Redeemable Convertible Preferred Stock [Member]
Temporary Equity [Line Items]
Preferred stock shares outstanding					20,956,426
Conversion of preferred stock into common stock					13,970,934
Series A [Member]
Temporary Equity [Line Items]
Undesignated preferred stock, authorized						11,200,158
Preferred stock shares outstanding						11,200,158
Preferred stock, conversion price				2.0089
Preferred stock, redemption price				2.0089
Preferred Stock, liquidation price				2.0089
Series B [Member]
Temporary Equity [Line Items]
Undesignated preferred stock, authorized						5,438,478
Preferred stock shares outstanding						5,438,478
Preferred stock, conversion price				2.2065
Preferred stock, redemption price				2.2065
Preferred Stock, liquidation price				2.2065
Series C [Member]
Temporary Equity [Line Items]
Undesignated preferred stock, authorized						4,317,790
Preferred stock shares outstanding						4,317,790
Preferred stock, conversion price				3.474
Preferred stock, redemption price				3.474
Preferred Stock, liquidation price				3.474
Maximum [Member]
Temporary Equity [Line Items]
Shares authorized to issue				270,000,000
Minimum [Member]
Temporary Equity [Line Items]
Preferred Stock Conversion Basis Voting Percentage				75.00%
Period before first installment of redemption				90 days

Redeemable_Convertible_Preferr3

Redeemable Convertible Preferred Stock and Stockholders' Equity (Deficit) - Summary of Changes in Redeemable Convertible Preferred Stock (Detail) (USD $)	12 Months Ended
In Thousands, except Share data, unless otherwise specified	Dec. 31, 2014	Dec. 31, 2013
Temporary Equity [Line Items]
Beginning balance	$91,607	$86,655
Beginning balance, Shares	20,956,000	20,956,000
Accretion of redeemable convertible preferred stock to redemption value	2,442	4,952
Conversion of preferred stock into common stock	-94,049
Conversion of preferred stock into common stock, Shares	-20,956,000
Ending balance		91,607
Ending balance, Shares		20,956,000
Series A [Member]
Temporary Equity [Line Items]
Beginning balance	46,056	43,806
Beginning balance, Shares	11,200,000	11,200,000
Accretion of redeemable convertible preferred stock to redemption value	1,109	2,250
Conversion of preferred stock into common stock	-47,165
Conversion of preferred stock into common stock, Shares	-11,200,000
Ending balance		46,056
Ending balance, Shares		11,200,000
Series B [Member]
Temporary Equity [Line Items]
Beginning balance	21,500	20,300
Beginning balance, Shares	5,438,000	5,438,000
Accretion of redeemable convertible preferred stock to redemption value	592	1,200
Conversion of preferred stock into common stock	-22,092
Conversion of preferred stock into common stock, Shares	-5,438,000
Ending balance		21,500
Ending balance, Shares		5,438,000
Series C [Member]
Temporary Equity [Line Items]
Beginning balance	24,051	22,549
Beginning balance, Shares	4,318,000	4,318,000
Accretion of redeemable convertible preferred stock to redemption value	741	1,502
Conversion of preferred stock into common stock	-24,792
Conversion of preferred stock into common stock, Shares	-4,318,000
Ending balance		$24,051
Ending balance, Shares		4,318,000

Redeemable_Convertible_Preferr4

Redeemable Convertible Preferred Stock and Stockholders' Equity (Deficit) - Schedule of Redeemable Convertible Preferred Stock and Stockholders' Deficit (Detail) (USD $)	0 Months Ended		12 Months Ended
In Thousands, except Share data, unless otherwise specified	Dec. 19, 2002	Feb. 22, 2002	Dec. 31, 2013	Dec. 31, 2014
Stockholders Equity Common And Preferred Shares [Line Items]
Price				$0.00
Shares Authorized			20,956,426	20,000,000
Shares Issued			20,956,426	0
Shares Outstanding			20,956,426
Proceeds	$7,500	$6,000	$49,500
Aggregated Liquidation Preference			49,500
Series A [Member]
Stockholders Equity Common And Preferred Shares [Line Items]
Price			$2.01
Shares Authorized			11,200,158
Shares Issued			11,200,158
Shares Outstanding			11,200,158
Proceeds			22,500
Aggregated Liquidation Preference			22,500
Series B [Member]
Stockholders Equity Common And Preferred Shares [Line Items]
Date				1/31/06
Price			$2.21
Shares Authorized			5,438,478
Shares Issued			5,438,478
Shares Outstanding			5,438,478
Proceeds			12,000
Aggregated Liquidation Preference			12,000
Series C [Member]
Stockholders Equity Common And Preferred Shares [Line Items]
Price			$3.47
Shares Authorized			4,317,790
Shares Issued			4,317,790
Shares Outstanding			4,317,790
Proceeds			15,000
Aggregated Liquidation Preference			$15,000
Minimum [Member] | Series A [Member]
Stockholders Equity Common And Preferred Shares [Line Items]
Date				2/28/02
Minimum [Member] | Series C [Member]
Stockholders Equity Common And Preferred Shares [Line Items]
Date				12/31/07
Maximum [Member] | Series A [Member]
Stockholders Equity Common And Preferred Shares [Line Items]
Date				4/30/05
Maximum [Member] | Series C [Member]
Stockholders Equity Common And Preferred Shares [Line Items]
Date				3/31/08

Redeemable_Convertible_Preferr5

Redeemable Convertible Preferred Stock and Stockholders' Equity (Deficit) - Schedule of Redeemable Convertible Preferred Stock and Stockholders' Deficit (Parenthetical) (Detail) (USD $)	0 Months Ended		12 Months Ended
In Thousands, unless otherwise specified	Dec. 19, 2002	Feb. 22, 2002	Dec. 31, 2013
Disclosure of Compensation Related Costs, Share-based Payments [Abstract]
Financial proceeds	$7,500	$6,000	$49,500

Redeemable_Convertible_Preferr6

Redeemable Convertible Preferred Stock and Stockholders' Equity (Deficit) - Schedule of Changes in Accumulated Other Comprehensive Income Before Taxes (Detail) (USD $)	12 Months Ended
In Thousands, unless otherwise specified	Dec. 31, 2014	Dec. 31, 2013	Dec. 31, 2012
Accumulated Other Comprehensive Income (Loss) [Line Items]
Beginning balance	($145)	($42)
Other comprehensive income	-100	-108
Amounts reclassified from accumulated other comprehensive income:
Other income (expense)	-146	-120	-13
Net current-period other comprehensive loss	45	-103	144
Ending balance	-100	-145	-42
Reclassification out of Accumulated Other Comprehensive Income [Member] | Closure of Foreign Branch [Member]
Amounts reclassified from accumulated other comprehensive income:
Other income (expense)	$145	$5

Employee_Benefit_Plans_Additio

Employee Benefit Plans - Additional Information (Detail) (USD $)	12 Months Ended
	Dec. 31, 2014	Dec. 31, 2013
Defined Contribution Plan Disclosure [Line Items]
Employer contributions vesting period	4 years
United States [Member]
Defined Contribution Plan Disclosure [Line Items]
Maximum contribution limit made by the employee from their total earnings	50.00%
Matching contribution percentage limit	50.00%
Matching contribution limit of employee's compensation	6.00%
Contribution to 401(K) plan	$954,000	$273,000
Employer contributions vesting period	4 years
Maximum age for employee for participating 401(k) plans	21 years
International [Member]
Defined Contribution Plan Disclosure [Line Items]
Matching contribution percentage limit	3.00%
Contribution to 401(K) plan	$61,000

Stock_Award_Plans_and_Stock_Ba2

Stock Award Plans and Stock Based Compensation - Additional Information (Detail) (USD $)	1 Months Ended	12 Months Ended
	31-May-14	Dec. 31, 2014	Dec. 31, 2013	Dec. 31, 2012	Dec. 31, 2007
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Stock options expiration period		10 years
Stock options vesting period		4 years
Common stock, capital shares reserved for future instance		3,709,156
Employee stock purchase plan fair market value of the common stock	85.00%
Stock option exercised, shares		302,000	530,000
Stock option exercised, value		$567,000	$641,000	$436,000
Share based compensation unvested stock options		40,202	62,706
Share based compensation stock options repurchase		184,000	275,000
Stock option associated with early exercise vested		3,615,000
Percentage of forfeiture rate		9.00%	13.00%	13.00%
Unrecognized compensation expense		4,000,000
Weighted-average amortization period		3 years
Restricted common stock, shares issued					45,724
Restricted common stock, purchase price					$1.10
Amount of promissory note purchased					50,000
Recourse percentage of promissory note					50.00%
Due period for repayment on sale of shares					10 days
Due period for repayment of promissory note					5 years
Compensation expense		0	0
2014 Stock Option and Incentive Plan [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Common stock, capital shares reserved for future instance		2,347,615
Employee Stock Purchase Plan [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Common stock, capital shares reserved for future instance		448,000
Employee Stock Option [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Stock option exercised, shares			74,375
Stock option exercised, value			$321,000
Weighted average grant date fair value of stock option			$1.92
Stock option associated with early exercise vested		22,504	11,669

Stock_Award_Plans_and_Stock_Ba3

Stock Award Plans and Stock Based Compensation - Schedule of Estimated Weighted-Average Assumptions Used in Calculation of Fair Value of Options Granted and Rights to Acquire Stock Under ESPP (Detail)	12 Months Ended
	Dec. 31, 2014	Dec. 31, 2013	Dec. 31, 2012
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Risk-free interest rate	1.88%	1.49%	0.87%
Expected term (years)	6 years 15 days	6 years 11 days	6 years 7 days
Expected dividend yield	0.00%	0.00%	0.00%
Expected volatility of underlying stock	54.00%	52.00%	46.00%
Employee Stock Purchase Plan [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Risk-free interest rate	0.08%
Expected term (years)	8 months 5 days
Expected dividend yield	0.00%
Expected volatility of underlying stock	40.00%

Stock_Award_Plans_and_Stock_Ba4

Stock Award Plans and Stock Based Compensation - Schedule of Stock-Based Compensation Expense (Detail) (USD $)	12 Months Ended
In Thousands, unless otherwise specified	Dec. 31, 2014	Dec. 31, 2013	Dec. 31, 2012
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Stock-based compensation expense	$1,612	$640	$450
Cost of Maintenance and Professional Services [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Stock-based compensation expense	138	50	7
Research and Development [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Stock-based compensation expense	500	263	207
Sales and Marketing [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Stock-based compensation expense	532	137	171
General and Administrative [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Stock-based compensation expense	$442	$190	$65

Stock_Award_Plans_and_Stock_Ba5

Stock Award Plans and Stock Based Compensation - Schedule of Stock Option Activity (Detail) (USD $)	12 Months Ended
In Thousands, except Per Share data, unless otherwise specified	Dec. 31, 2014	Dec. 31, 2013
Disclosure of Compensation Related Costs, Share-based Payments [Abstract]
Number of shares, Outstanding, Beginning balance	3,777	3,477
Number of shares, Granted	332	993
Number of shares, Exercised	-302	-530
Number of shares, Forfeited	-77	-133
Number of shares, Expired	-21	-30
Number of shares, Outstanding, Ending balance	3,709	3,777
Weighted average exercise price, Outstanding, Beginning balance	$2.86	$1.55
Number of shares, Exercisable, Ending balance	2,961
Weighted average exercise price, Granted	$12.95	$6.80
Number of shares, vested or expected to vest, Ending balance	3,615
Weighted average exercise price, Exercised	$1.58	$1.73
Weighted average exercise price, Forfeited	$4.61	$3.14
Weighted average exercise price, Expired	$0.74	$0.32
Weighted average exercise price outstanding ending balance	$3.84	$2.86
Aggregate intrinsic value outstanding, Beginning balance	$23,491	$10,737
Weighted average exercise price, Outstanding, Ending balance	$2.63
Aggregate intrinsic value outstanding, Ending balance	34,206	23,491
Weighted average exercise price, Vested or expected to vest, Ending balance	$3.73
Aggregate intrinsic value, Exercisable	30,697
Weighted average remaining contractual life (in years), Outstanding	6 years 15 days
Aggregate intrinsic value, Vested or expected to vest	$33,733
Weighted average remaining contractual life (in years), Exercisable	5 years 4 months 10 days
Weighted average remaining contractual life (in years), Vested or expected to vest	5 years 11 months 19 days

Stock_Award_Plans_and_Stock_Ba6

Stock Award Plans and Stock Based Compensation - Summary of Information Relating to Options Granted and Exercised (Detail) (USD $)	12 Months Ended
In Thousands, except Per Share data, unless otherwise specified	Dec. 31, 2014	Dec. 31, 2013	Dec. 31, 2012
Disclosure of Compensation Related Costs, Share-based Payments [Abstract]
Weighted average fair value per share of options granted	$6.75	$3.43	$1.40
Aggregate intrinsic value of options exercised	$2,989	$1,685	$1,007
Fair value of options vested	1,338	553	540
Cash proceeds received upon exercise	$476	$916	$436

Income_Taxes_Schedule_of_Loss_

Income Taxes - Schedule of (Loss) Income 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]
(Loss) income before the provision for income taxes	($16,913)	($5,838)	$816
(Loss) income before the provision for income taxes	346	423	341
(Loss) income before income taxes	($16,567)	($5,415)	$1,157

Income_Taxes_Summary_of_provis

Income Taxes - Summary of provisions for Income Taxes (Detail) (USD $)	12 Months Ended
In Thousands, unless otherwise specified	Dec. 31, 2014	Dec. 31, 2013	Dec. 31, 2012
Current income tax provision:
Federal	$0	$0	$0
State	40		13
Foreign	129	108	96
Total current income tax provision	169	108	109
Deferred income tax provision:
Federal	0	0	0
State	0	0	0
Foreign	0	0	0
Total deferred income tax provision	0	0	0
Total income tax provision	$169	$108	$109

Income_Taxes_Reconciliation_of

Income Taxes - Reconciliation of Federal Income Tax Rate (Detail)	12 Months Ended
	Dec. 31, 2014	Dec. 31, 2013	Dec. 31, 2012
Income Tax Disclosure [Abstract]
Tax due at statutory rate	34.00%	34.00%	34.00%
State income taxes, net of federal tax benefit	-0.20%		1.10%
Foreign income taxes	0.30%	-0.90%	8.00%
Meals & entertainment	-0.40%	-1.10%	13.50%
Stock compensation	-2.10%	-1.90%	4.60%
Fines & penalties		-0.30%	1.20%
Tax credits	7.30%	26.80%	-17.30%
Change in valuation allowance	-39.90%	-58.50%	-36.00%
Effective tax rate	-1.00%	-1.90%	9.10%

Income_Taxes_Additional_Inform

Income Taxes - Additional Information (Detail) (USD $)	12 Months Ended
	Dec. 31, 2014	Dec. 31, 2013	Dec. 31, 2012
Income Tax Examination [Line Items]
US federal statutory rate foreign income	34.00%	34.00%	34.00%
Increases in valuation allowance	$6,100,000	$3,400,000
Federal operating loss carry forwards, Net	54,400,000	36,600,000
State operating loss carry forwards ,Net	42,100,000	15,500,000
Tax credit carry forwards	5,134,000	3,814,000
Tax credit carry forward expiration	2034
Operating loss carry forwards expiration	2034
Ownership change description	In general, an ''ownership change'' generally occurs if there is a cumulative change in our ownership by ''5-percent shareholders'' that exceeds 50 percentage points over a rolling three-year period
Uncertain tax positions, interest and penalties accrued	0	0	0
Income tax yet to be provided on certain undistributed earning of foreign subsidiaries	558,000
Employee Stock Option [Member]
Income Tax Examination [Line Items]
Federal operating loss carry forwards, Net	3,800,000	3,800,000
State operating loss carry forwards ,Net	3,300,000	3,300,000
U.S. Federal Tax Rate [Member]
Income Tax Examination [Line Items]
Tax credit carry forwards	6,000,000
U.S. Federal Tax Rate [Member] | Earliest Tax Year [Member]
Income Tax Examination [Line Items]
Tax years remain open to examination		2011
U.S. Federal Tax Rate [Member] | Latest Tax Year [Member]
Income Tax Examination [Line Items]
Tax years remain open to examination		2014
State Tax Rate [Member]
Income Tax Examination [Line Items]
Tax credit carry forwards		$4,500,000
Foreign Tax Authority [Member] | Earliest Tax Year [Member]
Income Tax Examination [Line Items]
Tax years remain open to examination		2006
Foreign Tax Authority [Member] | Latest Tax Year [Member]
Income Tax Examination [Line Items]
Tax years remain open to examination		2014

Income_Taxes_Schedule_of_Defer

Income Taxes - Schedule of Deferred Tax Assets (Liabilities) (Detail) (USD $)	Dec. 31, 2014	Dec. 31, 2013
In Thousands, unless otherwise specified
Income Tax Disclosure [Abstract]
Net operating loss carryforwards	$18,235	$11,919
Tax credit carry forwards	5,134	3,814
Start-up and research and development capitalized expenditures	1,806	2,674
Deferred revenue	1,325	1,590
Other temporary differences	1,858	3,297
Gross deferred assets	28,358	23,294
Valuation allowance	-27,490	-21,410
Deferred tax assets, net	868	1,884
Depreciation	-333	-1,463
Other temporary differences	-535	-421
Gross deferred tax liabilities	-868	-1,884
Net deferred tax asset (liability)	$0	$0

Computation_of_Net_Loss_Per_Sh2

Computation of Net Loss Per Share - Summary of Components of Net Loss per Share (Detail) (USD $)	3 Months Ended								12 Months Ended
In Thousands, except Per Share data, unless otherwise specified	Dec. 31, 2014	Sep. 30, 2014	Jun. 30, 2014	Mar. 31, 2014	Dec. 31, 2013	Sep. 30, 2013	Jun. 30, 2013	Mar. 31, 2013	Dec. 31, 2014	Dec. 31, 2013	Dec. 31, 2012
Numerator:
Net (loss) income	($1,663)	($4,454)	($3,552)	($7,067)	($3,259)	($650)	($84)	($1,530)	($16,736)	($5,523)	$1,048
Accretion of redeemable convertible preferred stock to redemption value									-2,442	-4,952	-4,957
Net loss attributable to common stockholders									($19,178)	($10,475)	($3,909)
Denominator:
Weighted average common shares outstanding used in computing basic and diluted net loss per common share									13,950	3,359	2,868
Net loss per share, basic and diluted	($0.07)	($0.19)	($1.08)	($2.29)	($1.26)	($0.54)	($0.41)	($0.59)	($1.37)	($3.12)	($1.36)

Computation_of_Net_Loss_Per_Sh3

Computation of Net Loss Per Share - Summary of Common Stock Equivalents Excluded from Computation of Diluted Net Loss per Share (Detail)	12 Months Ended
In Thousands, unless otherwise specified	Dec. 31, 2014	Dec. 31, 2013	Dec. 31, 2012
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items]
Antidilutive securities excluded from computation of diluted net loss per share	3,749	17,931	17,568
Options to Purchase Common Stock [Member]
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items]
Antidilutive securities excluded from computation of diluted net loss per share	3,709	3,777	3,477
Common Stock Subject to Repurchase [Member]
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items]
Antidilutive securities excluded from computation of diluted net loss per share	40	63
Warrants [Member]
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items]
Antidilutive securities excluded from computation of diluted net loss per share		120	120
Convertible Preferred Stock [Member]
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items]
Antidilutive securities excluded from computation of diluted net loss per share		13,971	13,971

Segment_and_Geographic_Informa2

Segment and Geographic Information - Schedule of Derived Revenues (Detail) (USD $)	3 Months Ended								12 Months Ended
In Thousands, unless otherwise specified	Dec. 31, 2014	Sep. 30, 2014	Jun. 30, 2014	Mar. 31, 2014	Dec. 31, 2013	Sep. 30, 2013	Jun. 30, 2013	Mar. 31, 2013	Dec. 31, 2014	Dec. 31, 2013	Dec. 31, 2012
Segment Reporting Disclosure [Line Items]
Revenues	$29,028	$25,278	$23,233	$19,440	$21,634	$17,907	$17,315	$14,255	$96,979	$71,111	$54,024
United States [Member]
Segment Reporting Disclosure [Line Items]
Revenues									76,159	56,371	42,269
England [Member]
Segment Reporting Disclosure [Line Items]
Revenues									5,241	4,093	3,813
Rest Of World [Member]
Segment Reporting Disclosure [Line Items]
Revenues									$15,579	$10,647	$7,942

Segment_and_Geographic_Informa3

Segment and Geographic Information - Summary of Long lived Assets Related to Segment Information (Detail) (USD $)	Dec. 31, 2014	Dec. 31, 2013
In Thousands, unless otherwise specified
Geographic Information [Line Items]
Long live assets	$7,640	$6,682
United States [Member]
Geographic Information [Line Items]
Long live assets	7,562	6,546
England [Member]
Geographic Information [Line Items]
Long live assets	$78	$136

Concentration_of_Risk_and_OffB1

Concentration of Risk and Off-Balance Sheet Risk - Additional Information (Detail)	12 Months Ended
	Dec. 31, 2014	Dec. 31, 2013	Dec. 31, 2012
	Customer	Customer	Customer
Revenues [Member]
Concentration Risk [Line Items]
Number of customers or resellers accounted for 10% or more of revenues or accounts receivable	0	1	1
Accounts Receivable [Member]
Concentration Risk [Line Items]
Number of customers or resellers accounted for 10% or more of revenues or accounts receivable	0	0

Related_Party_Transactions_Add

Related Party Transactions - Additional Information (Detail) (USD $)	12 Months Ended
	Dec. 31, 2014	Dec. 31, 2013
Related Party Transaction [Line Items]
Due to related party, Description	If revenues associated with the intellectual property exceed $1.7 million; an amount will be due to the former Validus CEO, who is an employee of the Company, but who is not a director, executive officer or five percent holder of the Company's equity securities.
Contingent liability	$632,000	$1,000,000
Payments made to related party	0
Minimum [Member]
Related Party Transaction [Line Items]
Revenues associated with intellectual property	$1,700,000

Quarterly_Financial_Informatio2

Quarterly Financial Information (Unaudited) - Quarterly Financial Information (Detail) (USD $)	3 Months Ended								12 Months Ended
In Thousands, except Per Share data, unless otherwise specified	Dec. 31, 2014	Sep. 30, 2014	Jun. 30, 2014	Mar. 31, 2014	Dec. 31, 2013	Sep. 30, 2013	Jun. 30, 2013	Mar. 31, 2013	Dec. 31, 2014	Dec. 31, 2013	Dec. 31, 2012
Quarterly Financial Information Disclosure [Abstract]
Revenues	$29,028	$25,278	$23,233	$19,440	$21,634	$17,907	$17,315	$14,255	$96,979	$71,111	$54,024
Gross profit	20,908	16,638	16,358	13,087	15,213	13,375	13,214	10,440	66,991	52,242	40,606
Net loss	($1,663)	($4,454)	($3,552)	($7,067)	($3,259)	($650)	($84)	($1,530)	($16,736)	($5,523)	$1,048
Net loss attributable to common shareholders, basic and diluted	($0.07)	($0.19)	($1.08)	($2.29)	($1.26)	($0.54)	($0.41)	($0.59)	($1.37)	($3.12)	($1.36)