Vocera Communications (VCRA) 10-K 12 Mar 15 2014 FY Annual report Financial data

Document_and_Entity_Informatio

Document and Entity Information Document (USD $)	12 Months Ended
In Millions, except Share data, unless otherwise specified	Dec. 31, 2014	Mar. 10, 2015	Jun. 30, 2014
Document and Entity Information [Abstract]
Entity Registrant Name	VOCERA COMMUNICATIONS, INC.
Entity Central Index Key	1129260
Document Type	10-K
Document Period End Date	31-Dec-14
Amendment Flag	FALSE
Document Fiscal Year Focus	2014
Document Fiscal Period Focus	FY
Current Fiscal Year End Date	-19
Entity Filer Category	Accelerated Filer
Entity Well-known Seasoned Issuer	No
Entity Current Reporting Status	Yes
Entity Voluntary Filers	No
Entity Common Stock, Shares Outstanding		25,687,696
Entity Public Float			$225

Consolidated_Balance_Sheets

Consolidated Balance Sheets (USD $)	Dec. 31, 2014	Dec. 31, 2013
In Thousands, unless otherwise specified
Current assets
Cash and cash equivalents	$22,615	$39,652
Short-term investments	93,646	88,024
Accounts receivable, net	18,008	23,543
Other receivables	694	882
Inventories	3,462	5,665
Prepaid expenses and other current assets	2,017	1,892
Total current assets	140,442	159,658
Property and equipment, net	5,122	5,365
Intangible assets, net	3,171	1,544
Goodwill	9,988	5,575
Other long-term assets	905	965
Total assets	159,628	173,107
Current liabilities
Accounts payable	1,913	3,531
Accrued payroll and other current liabilities	10,863	9,841
Deferred revenue, current	28,474	26,133
Total current liabilities	41,250	39,505
Deferred revenue, long-term	6,974	6,398
Other long-term liabilities	1,692	1,641
Total liabilities	49,916	47,544
Commitments and contingencies (Note 7)
Stockholders' equity
Preferred stock, $0.0003 par value - 5,000,000 shares authorized as of December 31, 2014 and December 31, 2013; zero shares issued and outstanding	0	0
Common stock, $0.0003 par value - 100,000,000 shares authorized as of December 31, 2014 and December 31, 2013; 25,644,010 and 24,967,140 shares issued and outstanding as of December 31, 2014 and December 31, 2013, respectively	8	7
Additional paid-in capital	202,515	189,966
Accumulated other comprehensive income	-81	23
Accumulated deficit	-92,730	-64,433
Total stockholders’ equity	109,712	125,563
Total liabilities and stockholders’ equity	$159,628	$173,107

Consolidated_Balance_Sheets_Pa

Consolidated Balance Sheets (Paranthetical) (USD $)	Dec. 31, 2014	Dec. 31, 2013
Liabilities, Convertible Preferred Stock and Stockholders' Deficit
Common stock, par value	$0.00	$0.00
Common stock, shares authorized	100,000,000	100,000,000
Common stock, shares issued	25,644,010	24,967,140
Common stock, shares outstanding	25,644,010	24,967,140
Preferred Stock
Liabilities, Convertible Preferred Stock and Stockholders' Deficit
Preferred stock, par value	$0.00	$0.00
Preferred stock, shares authorized	5,000,000	5,000,000
Preferred stock, shares issued	0	0
Preferred stock, shares outstanding	0	0

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	$51,095	$62,393	$65,028
Service	44,326	40,105	35,929
Total revenue	95,421	102,498	100,957
Cost of Revenue [Abstract]
Product	18,766	21,714	21,551
Service	18,470	16,595	15,070
Total cost of revenue	37,236	38,309	36,621
Gross profit	58,185	64,189	64,336
Operating expenses
Research and development	18,035	14,915	11,618
Sales and marketing	49,611	44,928	33,432
General and administrative	18,062	14,906	14,390
Restructuring Charges	556	0	0
Total operating expenses	86,264	74,749	59,440
(Loss) income from operations	-28,079	-10,560	4,896
Interest income	355	257	171
Interest expense	0	0	-84
Other expense, net	-249	-53	-1,463
(Loss) income before income taxes	-27,973	-10,356	3,520
Provision for income taxes	-324	-109	-627
Net (loss) income	-28,297	-10,465	2,893
Undistributed Earnings (Loss) Allocated to Participating Securities, Basic	0	0	1,366
Net (loss) income attributable to common stockholders	($28,297)	($10,465)	$1,527
Net (loss) income per share attributable to common stockholders
Basic and diluted	($1.12)	($0.43)	$0.08
Weighted average shares used to compute net income (loss) per share attributable to common stockholders
Basic	25,329	24,621	17,979
Diluted	25,329	24,621	20,608

Consolidated_Statements_of_Com

Consolidated Statements of Comprehensive Income (Loss) (USD $)	12 Months Ended
In Thousands, unless otherwise specified	Dec. 31, 2014	Dec. 31, 2013	Dec. 31, 2012
Net (loss) income	($28,297)	($10,465)	$2,893
Other comprehensive (loss) income, net:
Change in unrealized (loss) gain on investments, net of tax	-104	18	5
Comprehensive (loss) income	($28,401)	($10,447)	$2,898

Statements_of_Stockholders_Equ

Statements of Stockholders' Equity (Deficit) (USD $)	Total	IPO [Member]	Follow-on public stock offering [Member]	Common stock	Common stock	Common stock	Additional paid-in capital	Additional paid-in capital	Additional paid-in capital	Accumulated other comprehensive gain	Accumulated deficit	Restricted stock units	Restricted stock units	Restricted stock units	Cashless Exercise [Member]	Cash Exercise [Member]	Cash Exercise [Member]	Cash Exercise [Member]
In Thousands, except Share data, unless otherwise specified	USD ($)	USD ($)	USD ($)	USD ($)	IPO [Member]	Follow-on public stock offering [Member]	USD ($)	IPO [Member]	Follow-on public stock offering [Member]	USD ($)	USD ($)	USD ($)	Common stock	Additional paid-in capital	Common stock	USD ($)	Common stock	Additional paid-in capital
					USD ($)	USD ($)		USD ($)	USD ($)					USD ($)				USD ($)
Balance at Dec. 31, 2011	($49,399)			$1			$7,461			$0	($56,861)
Balance (shares) at Dec. 31, 2011				3,780,490
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Conversion of preferred stock into common stock (shares)				12,937,750
Conversion of preferred stock to common stock	53,356			4			53,352
Shares sold at public offering					5,000,000	1,337,500
Issuance of common stock in a public offering		70,535	35,975		2	0		70,533	35,975
Reclassification of preferred stock warrant liability into additional paid-in capital upon initial public offering	3,141						3,141
Exercise of stock options (shares)				1,073,732
Exercise of stock options	1,684						1,684
Vesting of early exercised stock options	307						307
Exercise of common stock warrants															78,487
Proceeds from Warrant Exercises	0
Issuance of restricted stock awards				24,152
Non-employee stock-based compensation expense	29						29
Employee stock-based compensation expense	4,203						4,203
Income tax benefits from employee stock plans	406						406
Repurchase of early exercised options (shares)				-2,755
Repurchase of early exercised options	-10						-10
Net loss	2,893										2,893
Other comprehensive income	5									5
Balance at Dec. 31, 2012	123,125			7			177,081			5	-53,968
Balance (shares) at Dec. 31, 2012				24,229,356
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Exercise of stock options (shares)				420,492
Exercise of stock options	1,657						1,657
Vested, Number of Shares													71,824
RSUs released and tax settlement												-703		-703
ESPP, Shares Purchased for Award				215,039
Stock Issued During Period, Value, Employee Stock Purchase Plan	2,993						2,993
Vesting of early exercised stock options	123						123
Exercise of common stock warrants																	34,142
Proceeds from Warrant Exercises	226															226		226
Employee stock-based compensation expense	8,667						8,667
Income tax benefits from employee stock plans	-64						-64
Repurchase of early exercised options (shares)				-3,713
Repurchase of early exercised options	-14						-14
Net loss	-10,465										-10,465
Other comprehensive income	18									18
Balance at Dec. 31, 2013	125,563			7			189,966			23	-64,433
Balance (shares) at Dec. 31, 2013				24,967,140
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Issuance of common stock in a public offering				1
Exercise of stock options (shares)				293,615
Exercise of stock options	1,097						1,096
Vested, Number of Shares												-327,562
RSUs released and tax settlement	-1,270													-1,270
ESPP, Shares Purchased for Award	160,936			160,936
Stock Issued During Period, Value, Employee Stock Purchase Plan	1,588						1,588
Vesting of early exercised stock options	54						54
Proceeds from Warrant Exercises	0
Issuance of restricted stock awards													225,149
Employee stock-based compensation expense	11,084						11,084
Repurchase of early exercised options (shares)				-2,830
Repurchase of early exercised options	-3						-3
Net loss	-28,297										-28,297
Other comprehensive income	-104									-104
Balance at Dec. 31, 2014	$109,712			$8			$202,515			($81)	($92,730)
Balance (shares) at Dec. 31, 2014				25,644,010

Consolidated_Statements_of_Cas

Consolidated Statements of Cash Flows (USD $)	12 Months Ended
	Dec. 31, 2014	Dec. 31, 2013	Dec. 31, 2012
Cash flows from operating activities
Net (loss) income	($28,297,000)	($10,465,000)	$2,893,000
Depreciation, Depletion and Amortization	3,014,000	2,542,000	2,615,000
Adjustments to reconcile net income (loss) to net cash provided by operating activities:
Non-cash interest income	-7,000	-71,000	-18,000
Loss on disposal of property and equipment	77,000	0	27,000
Bad debt expense (recovery)	61,000	16,000	0
Inventory write-down	310,000	136,000	224,000
Change in lease-related performance liabilities	-595,000	-207,000	-3,000
Share-based Compensation	11,084,000	8,667,000	4,232,000
Excess tax benefits from employee stock plans	0	0	-325,000
Change in fair value of warrant liability	0	0	1,631,000
Changes in assets and liabilities
Accounts receivable	5,660,000	-1,861,000	-5,916,000
Increase (Decrease) in Other Receivables	188,000	-434,000	417,000
Inventories	1,894,000	-3,029,000	367,000
Prepaid expenses and other assets	-330,000	446,000	-1,348,000
Accounts payable	-1,678,000	690,000	-1,145,000
Increase (Decrease) in Other Operating Liabilities	1,100,000	-1,887,000	2,803,000
Deferred revenue	2,827,000	4,198,000	5,840,000
Net cash (used in) provided by operating activities	-4,692,000	-1,259,000	12,294,000
Cash flows from investing activities
Payment for purchase of property and equipment	-2,022,000	-3,770,000	-2,565,000
Payments to Acquire Businesses, Net of Cash Acquired	-6,950,000	0	0
Purchase of short-term investments	-112,299,000	-118,661,000	-104,869,000
Maturities of short-term investments	102,656,000	65,714,000	69,902,000
Sale of short-term investments	3,923,000	0	0
Changes in restricted cash	265,000	0	0
Net cash used in investing activities	-14,427,000	-56,717,000	-37,532,000
Cash flows from financing activities
Cash from lease-related performance obligations	635,000	847,000	1,114,000
Principal payment of borrowings	0	0	-8,333,000
Proceeds from initial public offering, net of offering costs	0	0	72,070,000
Proceeds from secondary public offering, net of offering costs	0	0	35,975,000
Payment for repurchase of common stock	-12,000	-14,000	-10,000
Excess tax benefits from employee stock plans	0	0	325,000
Proceeds from Issuance of Shares under Incentive and Share-based Compensation Plans, Excluding Stock Options	1,588,000	2,993,000	0
Proceeds from exercise of stock options	1,096,000	1,758,000	1,720,000
RSUs released and tax settlement	-1,225,000	-703,000	0
Proceeds from Warrant Exercises	0	226,000	0
Net cash provided by financing activities	2,082,000	5,107,000	102,861,000
Net (decrease) increase in cash and cash equivalents	-17,037,000	-52,869,000	77,623,000
Cash and cash equivalents at beginning of period	39,652,000	92,521,000	14,898,000
Cash and cash equivalents at end of period	22,615,000	39,652,000	92,521,000
Supplemental cash flow information
Cash paid for interest	0	0	91,000
Cash paid for income taxes	175,000	54,000	556,000
Supplemental disclosure of non-cash investing and financing activities
Property and equipment in accounts payable and accrued liabilities	$16,000	$104,000	$321,000

The_Company_and_Summary_of_Sig

The Company and Summary of Significant Accounting Policies	12 Months Ended
	Dec. 31, 2014
Accounting Policies [Abstract]
The Company and Summary of Significant Accounting Policies	The Company and Summary of Significant Accounting Policies
	Background
	Vocera Communications, Inc. and its subsidiaries (the "Company”) is a provider of secure, integrated, intelligent communication solutions, focused on empowering mobile workers in healthcare, hospitality, energy, and other mission-critical mobile work environments, in the U.S. and internationally. The significant majority of the Company's business is generated from sales of its solutions in the healthcare market to help our customers improve patient safety and experience, and increase operational efficiency. As of December 31, 2014, the Company's solutions have been installed in more than 1,300 facilities worldwide.
	The Vocera Communication System, which includes an intelligent enterprise software platform, a lightweight, wearable, voice-controlled communication badge, and smartphone applications, enables users to connect instantly with other staff simply by saying the name, function or group name of the desired recipient. It also securely delivers text messages and alerts directly to and from smartphones, replacing legacy pagers.
	The Company was incorporated in Delaware on February 16, 2000. The Company formed wholly-owned subsidiaries Vocera Communications UK Ltd and Vocera Communications Australia Pty Ltd. in 2005, Vocera Hand-Off, Inc., Vocera Canada, Ltd. and ExperiaHealth, Inc. in 2010 and Vocera Communications India Private Ltd. in 2013. In August 2013, we merged Vocera Hand-Off Communications, Inc. and ExperiaHealth, Inc. into our parent company, Vocera Communications, Inc.
	Since its inception, the Company has incurred significant losses and, as of December 31, 2014, had an accumulated deficit of $92.7 million. The Company has funded its operations primarily with customer payments for its products and services, proceeds from the issuance of common stock in connection with its initial public offering ("IPO") and follow-on offering and, before the IPO, from the issuances of convertible preferred stock and from borrowings under its term loan facility and the utilization of its line of credit. As of December 31, 2014, the Company had cash, cash equivalents and short-term investments of $116.3 million.
	The Company believes that its existing sources of liquidity will satisfy its working capital and capital requirements for at least the next twelve months.
	Basis of presentation
	The consolidated financial statements include the accounts of Vocera Communications, Inc. and its wholly owned subsidiaries. All inter-company transactions and balances have been eliminated in consolidation. The accompanying notes are prepared in accordance with accounting principles generally accepted in the United States (GAAP).
	Use of estimates
	The preparation of financial statements in conformity with GAAP requires the Company 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 expense during the reporting periods. The estimates include, but are not limited to, revenue recognition, warranty reserves, inventory reserves, stock-based compensation expense, provisions for income taxes and contingencies. Actual results could differ from these estimates, and such differences could be material to the Company’s financial position and results of operations.
	Cash, cash equivalents and short-term investments
	The Company’s cash equivalents and short-term investments consist of money market funds, commercial paper, U.S. government agency notes, U.S. Treasury notes, municipal debt and corporate debt. These investments are classified as available-for-sale securities and are carried at fair value with the unrealized gains and losses reported as a component of stockholders’ equity. Management determines the appropriate classification of its investments at the time of purchase and re-evaluates the available-for-sale designations as of each balance sheet date. Investments with an original purchase maturity of less than three months are classified as cash equivalents, all those with longer maturities are classified as short-term investments, which are available-for-sale.
	Restricted cash
	Restricted cash was $0.1 million and $0.3 million at December 31, 2014 and 2013, respectively, the majority of which is security for a corporate travel card facility and credit card processing services. All restricted cash is classified as current, under prepaids and other current assets on the consolidated balance sheet, based on the underlying terms of the arrangements.
	Allowance for doubtful accounts
	The allowance for doubtful accounts reflects the Company’s best estimate of probable losses inherent in the Company’s receivables portfolio determined on the basis of historical experience, specific allowances for known troubled accounts and other currently available evidence. The Company has not experienced significant credit losses from its accounts receivable. The Company performs a regular review of its customers’ payment histories and associated credit risks as it does not require collateral from its customers.
	The following table presents the changes in the allowance for doubtful accounts:
			Years ended December 31,
	(in thousands)		2014			2013			2012
	Allowance—beginning of period		$	(6	)	$	—		$	—
	Provisions for bad debts		(53		)	(29		)	—
	Recoveries from bad debts		4			13			—
	Write-offs and other		2			10			—
	Allowance—end of period		$	(53	)	$	(6	)	$	—
	Inventories
	Inventories are valued at the lower of standard cost (which approximates actual cost on a first-in, first-out basis) or market (net realizable value or replacement cost). The Company assesses the valuation of inventory and periodically writes down the value for estimated excess and obsolete inventory based upon assumptions about future demand and market conditions.
	Concentration of credit risk and other risks and uncertainties
	Financial instruments that subject the Company to concentration of credit risk consist primarily of cash, cash equivalents and short-term investments. The Company’s cash and cash equivalents are primarily deposited with high quality financial institutions and in money market funds. Deposits at these institutions and funds may, at times, exceed federally insured limits. Management believes that these financial institutions and funds are financially sound and, accordingly, that minimal credit risk exists. The Company has not experienced any losses on its deposits of cash and cash equivalents. Marketable securities are stated at fair value, and accounted for as available-for-sale within short-term investments. The counterparties to the agreements relating to the Company’s investment securities consist of major corporations, financial institutions and government agencies of high credit standing.
	The primary hardware component of the Company’s products is currently manufactured by a third-party contractor in Mexico. A significant disruption in the operations of this contractor may impact the production of the Company’s products for a substantial period of time, which could harm the Company’s business, financial condition and results of operations.
	Concentration of credit risk with respect to trade accounts receivable is considered to be limited due to the diversity of the Company’s customer base and geographic sales areas. At December 31, 2014 and 2013, no customer accounted for 10% or more of accounts receivable. For the years ended December 31, 2014, 2013 and 2012, no customer represented 10% or more of revenue.
	Property and equipment
	Property and equipment are stated at cost and depreciated on a straight-line basis over the estimated useful economic lives of the assets. Assets generally have useful economic lives of three years except for leasehold improvements, which are amortized using the straight-line method over the shorter of the remaining lease term or the estimated useful life of the related assets. Purchased or developed software also generally has a three year useful economic life, except for major ERP implementations, for which the Company assumes a five year useful economic life. Upon retirement or sale, the cost and related accumulated depreciation and amortization are removed from the consolidated balance sheet and the resulting gain or loss is reflected in operations. Maintenance and repairs which are not considered improvements and do not extend the useful life of the assets are charged to operations as incurred.
	The Company periodically reviews property and equipment for impairment whenever events or changes in circumstances indicate that the carrying amount of an asset is impaired or the estimated useful lives are no longer appropriate. Fair value is estimated based on discounted future cash flows. If indicators of impairment exist and the undiscounted projected cash flows associated with such assets are less than the carrying amount of the asset, an impairment loss is recorded to write the asset down to its estimated fair values. To date, the Company has not recorded any impairment charges.
	Software development costs.
	For internal-use software, the Company capitalizes certain internal and external costs incurred in its acquisition and creation. Capitalized internal-use software is included in property and equipment when development is complete and is amortized on a straight-line basis over the estimated useful life of the related asset, generally three years, except that five years is assumed for major ERP implementations. Based on the authoritative guidance, costs incurred either before or after the period satisfying the capitalization criteria, together with costs incurred for training and maintenance, are expensed as incurred. For the years ended December 31, 2014, 2013 and 2012, the Company capitalized costs of $0.2 million, $2.1 million and $1.1 million, respectively.
	Goodwill and intangible assets
	The Company allocates the purchase price of any acquisitions to tangible assets and liabilities and identifiable intangible assets acquired. Any residual purchase price is recorded as goodwill.
	Goodwill
	Goodwill is tested for impairment at the reporting unit level at least annually as of September 30, or more often if events or changes in circumstances indicate the carrying value may not be recoverable. As of December 31, 2014, no changes in circumstances indicate that goodwill carrying values may not be recoverable. The Company has identified two operating segments (Product and Service) which management also considers to be reporting units.
	Intangible assets
	Intangible assets are amortized over their estimated useful lives. Upon completion of development, acquired in-process research and development assets are generally considered amortizable, finite-lived assets and are amortized over their estimated useful lives. Finite-lived intangible assets consist of customer relationships, developed technology, trademarks and non-compete agreements. The Company evaluates 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 is recognized in the period of identification to the extent the carrying amount of an asset exceeds the fair value of such asset. No impairment of intangible assets was recorded in 2014, 2013 or 2012.
	Convertible preferred stock
	Prior to the Company’s IPO, the Company had issued and outstanding six series of convertible preferred stock. In connection with the Company’s IPO, in April 2012, each share of then-outstanding preferred stock automatically converted into common stock. In the statement of shareholders' equity for the year ended December 31, 2012, this was recorded as non-cash conversion of $53.4 million from preferred stock to common stock.
	Revenue recognition
	The Company derives revenue from the sales of communication badges, smartphones, perpetual software licenses for software that is essential to the functionality of the communication badges, software maintenance, extended product warranty and professional services. The Company also derives revenue from the sale of licenses for software that is not essential to the functionality of the communication badges. Sales tax is excluded from reported total revenue.
	Revenue is recognized when all of the below criteria are met:
	•	there is persuasive evidence that an arrangement exists, in the form of a written contract, amendments to that contract, or purchase orders from a third party;
	•	delivery has occurred or services have been rendered;
	•	the price is fixed or determinable after evaluating the risk of concession; and
	•	collectability is reasonably assured based on customer creditworthiness and past history of collection.
	In arrangements with multiple deliverables, assuming all other revenue criteria are met, the Company recognizes revenue for individual delivered items if they have value to the customer on a standalone basis. The Company allocates arrangement consideration at the inception of the arrangement to all deliverables using the relative selling price method. This method requires us to determine the selling price at which each deliverable could be sold if it were sold regularly on a standalone basis. When available, we use vendor-specific objective evidence ("VSOE") of the selling price. VSOE represents the price charged for a deliverable when it is sold separately, or for a deliverable not yet being sold separately, the price established by management with the relevant authority. The Company has established VSOE of the selling price for our post-installation technical support services and professional services. When VSOE of selling price is not available, third-party evidence ("TPE") of selling price for similar products and services is acceptable; however, our offerings and market strategy differ from those of our competitors, such that the Company cannot obtain sufficient comparable information about third parties' prices. If neither VSOE nor TPE are available, the Company uses its best estimates of selling prices ("BESP"). The Company determines BESP considering factors such as market conditions, sales channels, internal costs and product margin objectives and pricing practices. The Company regularly reviews and update our VSOE and BESP information.
	The relative selling price method allocates total arrangement consideration proportionally to each deliverable on the basis of its estimated selling price. In addition, the amount recognized for any delivered items cannot exceed that which is contingent upon delivery of any remaining items in the arrangement.
	A typical sales arrangement involves multiple elements, such as sales of communication badges, perpetual software licenses, professional services and maintenance services which entitle customers to unspecified upgrades, bug fixes, patch releases and telephone support. Revenue from the sale of communication badges and perpetual software licenses is recognized upon shipment or delivery at the customers’ premises as the contractual provisions governing sales of these products do not include any provisions regarding acceptance, performance or general right of return or cancellation or termination provisions adversely affecting revenue recognition. Revenue from the sale of maintenance services on software licenses is recognized over the period during which the services are provided, which is generally one year. Revenue from professional services is recognized either on a fixed fee basis based on milestones or on a time and materials basis as the services are provided, both of which generally take place over a period of two to twelve weeks.
	For non-essential software arrangements with multiple-deliverables, including license, professional services and maintenance, the Company recognizes license revenue using the residual method of accounting pursuant to relevant software revenue recognition guidance. Under the residual method, revenue is recognized when VSOE for fair value exists for all of the undelivered elements in the arrangement, but does not exist for one or more of the delivered elements in the arrangement. If evidence of fair value cannot be established for the undelivered elements, all of the revenue is deferred until evidence of fair value can be established, or until the items for which evidence of fair value cannot be established are delivered. For maintenance and certain professional services, the Company has established VSOE. The Company's revenue arrangements do not include a general right of return relative to the delivered products.
	Revenue from sales-type leases
	A portion of the Company's sales are made through multi-year lease agreements with customers. When these arrangements are considered sales-type leases, upon delivery of leased products to customers, the Company recognizes revenue for such products in an amount equal to the net present value of the minimum lease payments. Unearned income is recognized as part of product revenue under the effective interest method. The Company recognizes revenue related to certain executory costs, including maintenance and extended warranty, ratable over the term of the underlying arrangements. The Company recognizes revenue related to battery refresh executory costs when such executory costs are incurred.
	Proceeds from transfers of sales-type leases to third-party financial companies are allocated between the net investment in sales-type leases and the executory cost component for remaining service obligations based on relative present value. The difference between the amount of proceeds allocated to the net investment in lease and the carrying value of the net investment in lease is included in product revenue. Proceeds allocated to the executory cost component are accounted for as financing liabilities.
	For the year ended December 31, 2014, the Company transferred $1.4 million of lease receivables, recording an immaterial net loss and $0.6 million of new financing liabilities for future performance of executory service obligations. For the year ended December 31, 2013, the Company transferred $2.2 million of lease receivables, recording an immaterial net gain and $0.8 million of new financing liabilities for future performance of executory service obligations.
	For lease receivables retained as of December 31, 2014 and 2013, the Company recorded $0.9 million and $1.4 million, respectively, of net investment in sales-type leases, equivalent to the minimum lease payments for the delivered product.
	Commissions expense
	Sales commissions are recorded as sales and marketing expense and accrued as a current liability as orders are recorded; thus no contract acquisition costs are capitalized.
	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.
Research and development expenditures
Research and development costs are charged to operations as incurred. Software development costs incurred prior to the establishment of technological feasibility are included in research and development and are expensed as incurred. After technological feasibility is established, material software development costs up to general availability of the software will be capitalized and amortized on a straight-line basis over the estimated product life, or based on the ratio of current revenues to total projected product revenues, whichever is greater. To date, the time between the establishment of technological feasibility and general availability has been very short and therefore no significant costs have been incurred. Accordingly, the Company has not capitalized any software development costs.
Advertising costs
Advertising costs are included in sales and marketing expense and are expensed as incurred. Advertising costs for the years ended December 31, 2014, 2013 and 2012 were immaterial.
Product warranties
The Company offers warranties on certain products and records a liability for the estimated future costs associated with warranty claims, which is based upon historical experience and the Company’s estimate of the level of future costs. The Company provides for the estimated costs of hardware warranties at the time the related revenue is recognized. Costs are estimated based on historical and projected product failure rates, historical and projected repair costs, and knowledge of specific product failures (if any). The specific hardware warranty includes parts and labor over a period generally ranging from one to three years. The Company provides no warranty for software. The Company regularly re-evaluates its estimates to assess the adequacy of the recorded warranty liabilities and adjust the amounts as necessary. Warranty costs are reflected in the consolidated statement of operations as cost of sales.
Stock-based compensation
For options granted to employees, stock-based compensation is measured at grant date based on the fair value of the award and is expensed on a straight-line basis over the requisite service period. The Company determines the grant date fair value of the options using the Black-Scholes option-pricing model. Restricted stock awards and restricted stock units, first awarded in 2012, result in compensation expense, and are recognized on a straight-line basis over the requisite service period, based on the award date closing stock price. Equity instruments issued to non-employees are recorded at their fair value on the measurement date and are subject to periodic adjustment as the underlying equity instruments vest. The fair value of options granted to non-employees is amortized over the vesting period, on a straight-line basis.
For stock options issued to employees and non-employees with specific performance criteria, the Company makes a determination at each balance sheet date whether the performance criteria are probable of being achieved. Compensation expense is recognized until such time as the performance criteria are met or when it is probable that the criteria will not be met.
The Company will only recognize a tax benefit from stock-based awards in additional paid-in capital if an incremental tax benefit is realized after all other tax attributes currently available to the Company have been utilized. In addition, the Company has elected to account for the indirect effects of stock-based awards on other tax attributes, such as the research tax credit, through its statement of operations.
Income taxes
The Company uses the asset and liability method of accounting for income taxes. Under this method, the Company records deferred income taxes based on temporary differences between the financial reporting and tax bases of assets and liabilities and use enacted tax rates and laws that the Company expects will be in effect when they recover those assets or settle those liabilities, as the case may be, to measure those taxes. In cases where the expiration date of tax carryforwards or the projected operating results indicate that realization is not likely, the Company provides for a valuation allowance. Valuation allowances are established when necessary to reduce deferred tax assets to the amounts expected to be realized.
The Company has deferred tax assets, resulting from net operating losses, research and development credits and temporary differences that may reduce taxable income in future periods. A valuation allowance is required when it is more likely than not that all or a portion of a deferred tax asset will not be realized. In assessing the need for a valuation allowance, the Company estimates future taxable income, considering the feasibility of ongoing tax-planning strategies and the realizability of tax loss carryforwards. Valuation allowances related to deferred tax assets can be impacted by changes in tax laws, changes in statutory tax rates and future taxable income levels. If the Company were to determine that it would be able to realize its deferred tax assets in the future in excess of the net carrying amounts, it would decrease the recorded valuation allowance through an increase to income in the period in which that determination is made. Due to the history of losses the Company has generated in the past, the Company believes that it is not more likely than not that all of the deferred tax assets in the U.S. and Canada can be realized as of December 31, 2014 and 2013, respectively. Accordingly, the Company has recorded a full valuation allowance on its deferred tax assets for these years.
At December 31, 2014, the Company had a valuation allowance against net deferred tax assets of $30.1 million.
There is inherent uncertainty in evaluating the sustainability of the income tax positions the Company takes on its tax returns. The Company assesses its income tax positions and records tax benefits for all years subject to examination based upon management’s evaluation of the facts, circumstances and information available at the reporting date. For those tax positions where it is more likely than not that a tax benefit will be sustained, the Company has recorded the highest amount of tax benefit with a greater than 50% likelihood of being realized upon ultimate settlement with a taxing authority that has full knowledge of all relevant information. For those income tax positions where it is not more likely than not that a tax benefit will be realizable, no tax benefit has been recognized in the financial statements.
The Company includes interest and penalties with income taxes in the accompanying statement of operations. All of the Company’s net operating losses and research credit carryforwards prior to 2014 are subject to tax authority adjustment and all years after 2010 are still subject to tax authority examinations. The Company is currently not subject to any income tax audit examinations by tax authorities in any jurisdictions including U.S. federal, state and local or foreign countries.
Foreign currency translation
The functional currency of the Company’s foreign subsidiaries is the U.S. dollar.  Accordingly, monetary assets and liabilities in non-functional currency of these subsidiaries are remeasured using exchange rates in effect at the end of the period. Revenues and costs in local currency are remeasured using average exchange rates for the period, except for costs related to those consolidated balance sheet items that are remeasured using historical exchange rates. The resulting remeasurement gains and losses are included in the Company’s consolidated statements of operations. Translation gains and losses have not been significant to date.
Segments
Operating segments are components of an enterprise for which separate financial information is available and is evaluated regularly by the Company’s chief operating decision maker in deciding how to allocate resources and in assessing performance. The Company’s chief operating decision maker is the Chief Executive Officer. The Company has two operating segments which are both reportable business segments: (i) Product; and (ii) Service. See Note 9 for further analysis of the Company's determined operating segments.
Comprehensive income (loss)
For the years ended December 31, 2014, 2013 and 2012, the Company had nominal unrealized gains on available-for-sale securities. There were no other components within other comprehensive income for the years ended December 31, 2014, 2013 or 2012.
Related party transactions
During the years ended December 31, 2014, 2013 and 2012, the Company billed a related party, the University of Chicago Medical Center (UCMC), $0.3 million, $0.5 million and $0.5 million, respectively, for consulting services and technology solutions. One of the Company's board members is the President of UCMC. These transactions were recorded at arms-length prices. During the year ended December 31, 2013, the Company billed a related party, the Hewlett-Packard Company, approximately $9,200 for software and support, at arms’ length prices. Through July of 2013, John N. McMullen, one of the Company’s directors, served as Treasurer & Senior Vice President at Hewlett-Packard. There were no material related party transactions for Hewlett-Packard in the year ended December 31, 2012.
Recent accounting pronouncements
In May 2014, the FASB together with the International Accounting Standards Board issued converged guidance for revenue recognition that will replace most existing guidance, eliminate industry-specific guidance and provide a unified model for determining how and when revenue from contracts with customers should be recognized. Under the new guidance, an entity should recognize revenue to depict the transfer of promised goods or services to customers in an amount that reflects the consideration to which the entity expects to be entitled in exchange for those goods or services. The standard will also introduce additional disclosures, changes in asset and liability accounting, and changes in gain/loss recognition for asset transfers unrelated to customer transactions.
The Company’s effective date for this standard will be the first quarter of 2017; early application is not permitted. Two methods of transition are provided: a full retrospective approach, with certain practical expedients allowed, and a cumulative effect method, with balance sheet adjustment as of January 1, 2017. The Company is evaluating the effect the new standard will have on its consolidated financial statements and related disclosures. The Company has not yet selected a transition method nor has it determined the future effect of the standard on its financial position or results of operations.

Fair_value_of_financial_instru

Fair value of financial instruments	12 Months Ended
	Dec. 31, 2014
Fair Value Disclosures [Abstract]
Fair value of financial instruments	Fair value of financial instruments
	The carrying values of the Company’s cash and cash equivalents and short-term investments approximate their fair value due to their short-term nature. As a basis for determining the fair value of its assets and liabilities, the Company established a three-tier fair value hierarchy which prioritizes the inputs used in measuring fair value as follows: (Level 1) observable inputs such as quoted prices in active markets; (Level 2) inputs other than the quoted prices in active markets that are observable either directly or indirectly; and (Level 3) unobservable inputs in which there is little or no market data which requires the Company to develop its own assumptions. This hierarchy requires the Company to use observable market data, when available, and to minimize the use of unobservable inputs when determining fair value. For the years ended December 31, 2014, 2013 and 2012 there have been no transfers between Level 1 and Level 2 fair value instruments and no transfers in or out of Level 3.
	The Company's money market funds are classified within Level 1 of the fair value hierarchy because they are valued using quoted market prices. The fair value of the Company's Level 2 fixed income securities are obtained from independent pricing services, which may use quoted market prices for identical or comparable instruments or model-driven valuations using observable market data or other inputs corroborated by observable market data. The Company does not have any financial instruments which are valued using Level 3 inputs.
	The table below summarizes the Company’s assets that are measured at fair value on a recurring basis, by level, within the fair value hierarchy as of December 31, 2014 and 2013, respectively. There were no liabilities measured at fair value on a recurring basis for these dates.
		31-Dec-14						31-Dec-13
	(in thousands)	Level 1		Level 2		Total		Level 1		Level 2		Total
	Assets
	Money market funds	$	7,795	$	—	$	7,795	$	22,991	$	—	$	22,991
	Commercial paper	—		3,225		3,225		—		900		900
	U.S. government agency securities	—		5,955		5,955		—		11,279		11,279
	U.S. Treasury securities	—		4,043		4,043		—		5,235		5,235
	Municipal debt securities	—		3,924		3,924		—		4,765		4,765
	Corporate debt securities	—		82,517		82,517		—		67,055		67,055
	Total assets measured at fair value	$	7,795	$	99,664	$	107,459	$	22,991	$	89,234	$	112,225
	The financial accounts that are not subject to recurring fair value measurement include trade and other receivables, prepaid expenses and other current assets, total current liabilities and deferred revenues, both current and long-term. Due to their short maturities, the carrying amounts of these accounts approximate their fair values.

Cash_Cash_Equivalents_and_Shor

Cash, Cash Equivalents and Short-term Investments	12 Months Ended
	Dec. 31, 2014
Cash and Cash Equivalents [Abstract]
Cash, Cash Equivalents, and Short-term Investments	Cash, Cash Equivalents and Short-Term Investments
	The following tables display gross unrealized gains and gross unrealized losses for cash, cash equivalents and available-for-sale investments for the periods presented:
		As of December 31, 2014
	(in thousands)	Amortized		Unrealized		Unrealized			Fair
		Cost		Gains		Losses			value
	Cash and cash equivalents:
	Demand deposits and other cash	$	8,802	$	—	$	—		$	8,802
	Money market funds	7,795		—		—			7,795
	Commercial paper	1,365		—		—			1,365
	U.S. government agency securities	100		—		—			100
	Corporate debt securities	4,553		—		—			4,553
	Total cash and cash equivalents	22,615		—		—			22,615
	Short-Term Investments:
	Commercial paper	1,860		—		—			1,860
	U.S. government agency securities	5,856		1		(2		)	5,855
	U.S. Treasury securities	4,042		1		—			4,043
	Municipal debt securities	3,922		2		—			3,924
	Corporate debt securities	78,044		5		(85		)	77,964
	Total short-term investments	93,724		9		(87		)	93,646
	Total cash, cash equivalents and short-term investments	$	116,339	$	9	$	(87	)	$	116,261
		As of December 31, 2013
	(in thousands)	Amortized Cost		Unrealized Gains		Unrealized Losses			Fair value
	Cash and cash equivalents:
	Demand deposits and other cash	$	15,451	$	—	$	—		$	15,451
	Money market funds	22,991		—		—			22,991
	Commercial paper	150		—		—			150
	Corporate debt securities	1,060		—		—			1,060
	Total cash and cash equivalents	39,652		—		—			39,652
	Short-Term Investments:
	Commercial paper	750		—		—			750
	U.S. government agency securities	11,275		5		(1		)	11,279
	U.S. Treasury securities	5,233		2		—			5,235
	Municipal debt securities	4,758		7		—			4,765
	Corporate debt securities	65,982		20		(7		)	65,995
	Total short-term investments	87,998		34		(8		)	88,024
	Total cash, cash equivalents and short-term investments	$	127,650	$	34	$	(8	)	$	127,676
	The Company has determined that the unrealized losses on its short-term investments as of December 31, 2014 and 2013 do not constitute an "other than temporary impairment". The unrealized losses for the short-term investments as of December 31, 2014 and 2013 have all been in a continuous unrealized loss position for less than twelve months. The Company’s conclusion of no “other than temporary impairment” is based on the high credit quality of the securities, their short remaining maturity (less than five months, weighted average) and the Company’s intent and ability to hold such loss securities until maturity.
	Classification of the cash, cash equivalent and short-term investments by contractual maturity was as follows:
	(in thousands)	One year or shorter		Between 1 and 2 years		Total
	Balances as of December 31, 2014
	Cash and cash equivalents (1)	$	22,615	$	—	$	22,615
	Short-term investments	76,917		16,729		93,646
	Cash, cash equivalents and short-term investments	99,532		16,729		116,261
	Balances as of December 31, 2013
	Cash and cash equivalents (1)	$	39,652	$	—	$	39,652
	Short-term investments	71,464		16,560		88,024
	Cash, cash equivalents and short-term investments	$	111,116	$	16,560	$	127,676
	(1) Includes demand deposits and other cash, money market funds and other cash equivalent securities, all with 0-90 day maturity at purchase.
	All the above tables exclude restricted cash, primarily held in certificates of deposit, of $0.1 million and $0.3 million as of December 31, 2014 and December 31, 2013, respectively, which is classified in prepaids and other current assets on the consolidated balance sheet.

Income_loss_per_share

Income (loss) per share	12 Months Ended
	Dec. 31, 2014
Earnings Per Share [Abstract]
Income (loss) per share	Income (loss) per share
	For the year ended December 31, 2012, basic and diluted net income per common share is presented in conformity with the two-class method required for participating securities. Immediately prior to the completion of the Company’s IPO on April 2, 2012, holders of Series A through Series F preferred stock were each entitled to receive non-cumulative dividends at the annual rate of 8% per share per annum, respectively, payable prior and in preference to any dividends on any shares of the Company’s common stock. In the event a dividend is paid on common stock, the holders of preferred stock were entitled to a proportionate share of any such dividend as if they were holders of common stock (on an as-if converted basis). The holders of the preferred stock did not have a contractual obligation to share in the losses of the Company. The Company considered its preferred stock to be participating securities. Additionally, the Company considers shares issued upon the early exercise of options subject to repurchase and unvested restricted shares to be participating securities as the holders of these shares have a nonforfeitable right to dividends. In accordance with the two-class method, earnings allocated to these participating securities and the related number of outstanding shares of the participating securities, which include contractual participation rights in undistributed earnings, have been excluded from the computation of basic and diluted net income per common share.
	Under the two-class method, net income attributable to common stockholders is determined by allocating undistributed earnings, calculated as net income less income attributable to participating securities between common stock and participating securities. In computing diluted net income attributable to common stockholders for calculation of diluted net income per share, undistributed earnings are re-allocated to reflect the potential impact of dilutive securities. Basic net income per common share is computed by dividing the net income attributable to common stockholders by the weighted-average number of common shares outstanding during the period. All participating securities are excluded from basic weighted-average common shares outstanding. Diluted net income per share attributable to common stockholders is computed by dividing the net income attributable to common stockholders for calculation of diluted net income per share by the weighted-average number of common shares outstanding, including potential dilutive common shares assuming the dilutive effect of outstanding stock options using the treasury stock method.
	For the year ended December 31, 2013 and 2014, the two-class method is not applicable due to the net loss, which must be attributed entirely to the common shareholders. Additionally, as of December 31, 2014 and 2013, there are only 2,364 and 26,463, respectively of participating securities, consisting of repurchasable shares issued from early exercise of options and unvested restricted shares, so that the future effect of participating securities would generally be immaterial, even in years with net income.
	The following table presents the calculation of basic and diluted net income (loss) per share:
		Years ended December 31,
	(in thousands, except for share and per share amounts)	2014				2013			2012
	Numerator:
	Net (loss) income	$	(28,297	)		$	(10,465	)	$	2,893
	Less: undistributed earnings attributable to participating securities	—				—			(1,366		)
	Net (loss) income attributable to common stockholders	$	(28,297	)		$	(10,465	)	$	1,527
	Reallocation of undistributed earnings attributable to participating securities	—				—			32
	Net (loss) income attributable to common stockholders for diluted net (loss) income per share	$	(28,297	)		$	(10,465	)	$	1,559
	Denominator:
	Weighted-average shares used to compute basic net income (loss) per common share	25,329				24,621			17,979
	Effect of potentially dilutive securities:
	Employee stock options and restricted stock units	—				—			2,547
	Stock warrants	—				—			82
	Weighted average shares used to compute diluted income (loss) per common share	25,329				24,621			20,608
	Net (loss) income per share
	Net (loss) income per common share - basic and diluted	($1.12)				($0.43)			$0.08
	For the years ended December 31, 2014, 2013 and 2012, the following securities were not included in the calculation of diluted shares outstanding as the effect would have been anti-dilutive:
		As of December 31,
	(in thousands)	2014			2013			2012
	Options to purchase common stock	3,573			3,335			367
	Common stock subject to repurchase	5			25			—
	Warrants to purchase common stock	44			44			—
	Restricted stock units	981			623			25
	Restricted stock awards	—			12			—

Goodwill_and_intangible_assets

Goodwill and intangible assets	12 Months Ended
	Dec. 31, 2014
Goodwill and Intangible Assets Disclosure [Abstract]
Goodwill and intangible assets	Goodwill and intangible assets
	Goodwill
	The Company had $10.0 million and $5.6 million of goodwill as of December 31, 2014 and 2013, respectively. The additions to goodwill during the year ended December 31, 2014 of $4.4 million were based on the purchase price allocations of the acquisitions completed during 2014 (See Note 11). Goodwill is tested for impairment at the reporting unit level at least annually or more often if events or changes in circumstances indicate the carrying value may not be recoverable. The Company has two reporting units: Product and Service; as of December 31, 2014 all of the Company's goodwill resides in the Product reporting unit. The Company performed the annual required test of impairment of goodwill as of September 30, 2014 by performing Step 1 under authoritative accounting guidance. The Company’s annual impairment test indicated that the fair value exceeded the carrying value for each of its reporting units. For both 2013 and 2012, the Company used the qualitative assessment permitted under authoritative accounting guidance. Among the qualitative factors considered were changes since the prior impairment in the following: industry and competitive environment, business strategy, product mix, buyer and supplier bargaining power, potential market size, consistency in operating margins and cash flows, change in reporting unit / product life cycle stage and earnings quality and sustainability. No impairment was recorded in 2014, 2013 or 2012. As of December 31, 2014, no changes in circumstances indicate that goodwill carrying values may not be recoverable.
	Intangible assets
	The fair values for acquired intangible assets were determined by management with consideration of, in part, valuations performed by independent valuation specialists. Acquisition-related intangible assets are amortized over the life of the assets on an accelerated basis that approximates the expected economic benefit of the assets. This assumption results in amortization that is higher in earlier periods of the useful life. To date there has been no impairment of the Company's intangible assets. The estimated useful lives and carrying value of acquired intangible assets are as follows:
				December 31, 2014						December 31, 2013
	(in thousands)	Weighted average		Gross		Accumulated		Net		Gross		Accumulated		Net
		useful life		carrying		amortization		carrying		carrying		amortization		carrying
		(years)		amount				amount		amount				amount
	Intangible assets:
	Customer relationships	7 to 9		$	2,520	$	1,722	$	798	$	2,350	$	1,449	$	901
	Developed technology	4 to 7		$	2,710	$	1,693	$	1,017	$	1,880	$	1,264	$	616
	Trademarks	4 to 7		$	110	$	63	$	47	$	70	$	43	$	27
	Non-compete Agreements	2 to 4		460		91		369		70		70		—
	Intangible assets - finite life			$	5,800	$	3,569	$	2,231	$	4,370	$	2,826	$	1,544
	In-process R&D	n/a		$	940	$	—	$	940	$	—	$	—	$	—
	Intangible assets, net book value			$	6,740	$	3,569	$	3,171	$	4,370	$	2,826	$	1,544
	Amortization of intangible assets was $0.8 million, $0.7 million and $0.9 million for the years ended December 31, 2014, 2013 and 2012, respectively.
	Amortization of acquired intangible assets is reflected in the cost of revenues for developed technology and in operating expenses for the other intangibles. The estimated future amortization of acquired intangible assets as of December 31, 2014 was as follows:
	(in thousands)	Future amortization
	2015	727
	2016	562
	2017	394
	2018	275
	2019	229
	Thereafter	44
	Future amortization expense	$	2,231

Balance_Sheet_Components

Balance Sheet Components	12 Months Ended
	Dec. 31, 2014
Balance Sheet Components [Abstract]
Balance Sheet Components	Consolidated balance sheet components
	Inventories
			December 31,
	(in thousands)		2014				2013
	Raw materials		$	759			$	806
	Finished goods		2,703				4,859
	Total inventories		$	3,462			$	5,665
	Property and equipment, net
			December 31,
	(in thousands)		2014				2013
	Computer equipment and software		$	8,772			$	7,345
	Furniture, fixtures and equipment		962				924
	Leasehold improvements		2,298				2,125
	Manufacturing tools and equipment		3,795				3,081
	Construction in process		122				555
	Property and equipment, at cost		15,949				14,030
	Less: Accumulated depreciation		(10,827		)		(8,665		)
	Property and equipment, net		$	5,122			$	5,365
	Depreciation and amortization expense for property and equipment for the years ended December 31, 2014, 2013 and 2012 was $2.2 million, $1.8 million and $1.7 million, respectively.
	Net investment in sales-type leases
	The Company has sales-type leases with terms of 1.25 to 4 years. Sales-type lease receivables are collateralized by the underlying equipment. The components of our net investment in sales-type leases are as follows:
		December 31,
	(in thousands)	2014				2013
	Net minimum lease payments to be received	$	1,882			$	2,597
	Less: Unearned interest income and executory revenue portion	(962		)		(1,167		)
	Net investment in sales-type leases	920				1,430
	Less: Current portion	(564		)		(620		)
	Non-current net investment in sales-type leases	$	356			$	810
	There were no allowances for doubtful accounts on these leases as of December 31, 2014 and 2013. There is no guaranteed or unguaranteed residual value on the leased equipment. The current and non-current net investments in sales-types leases are reported as components of the consolidated balance sheet captions "other receivables" and "other long-term assets", respectively.
	The minimum lease payments expected for future years under sales-type leases as of December 31, 2014 were as follows:
	(in thousands)	Future lease payments
	2015	$	877
	2016	705
	2017	291
	2018	9
	Thereafter	—
	Total	$	1,882
	Accrued payroll, restructuring and other current liabilities
			December 31,
	(in thousands)		2014				2013
	Payroll and related expenses		$	7,009			$	5,065
	Accrued payables		1,715				2,259
	Deferred rent, current portion		299				490
	Lease financing, current portion		645				528
	Product warranty		497				840
	Customer prepayments		283				281
	Sales and use tax payable		293				259
	Other		122				119
	Total accrued payroll and other current liabilities		$	10,863			$	9,841
	Included in payroll and related expenses above is $0.2 million of accrued severance-related restructuring charges that will be paid by March 31, 2015. During the fourth quarter of 2014, the Company initiated a restructuring plan which resulted in $0.7 million of severance charges, of which $0.1 million was recorded to cost of revenue and $0.6 million was recorded to operating expenses.
	The Company provides for the estimated costs of hardware warranties at the time the related revenue is recognized. Costs are estimated based on historical and projected product failure rates, historical and projected repair costs, and knowledge of specific product failures (if any). The specific hardware warranty includes parts and labor over a period generally ranging from one to three years. The Company provides no warranty for software. The Company regularly re-evaluates its estimates to assess the adequacy of the recorded warranty liabilities and adjust the amounts as necessary.
	A reconciliation of the changes in the Company’s warranty reserve for the years ended December 31, 2014, 2013 and 2012 is as follows:
			Years ended December 31,
	(in thousands)		2014				2013			2012
	Warranty balance at the beginning of the period		$	840			$	297		$	983
	Warranty expense accrued for shipments during the period		723				1,185			540
	Changes in estimate related to pre-existing warranties		(68		)		536			(242		)
	Warranty settlements made		(998		)		(1,178		)	(984		)
	Warranty balance at the end of the period		$	497			$	840		$	297

Commitments

Commitments	12 Months Ended
	Dec. 31, 2014
Commitments and Contingencies Disclosure [Abstract]
Commitments	Commitments and contingencies
	Non-cancelable purchase commitments
	The Company enters into non-cancelable purchase commitments with its third-party manufacturer whereby the Company is required to purchase any inventory held by the third-party manufacturer that have been purchased by them based on confirmed orders from the Company. As of December 31, 2014 and 2013, approximately $1.9 million and $3.1 million, respectively, of raw material inventory was purchased and held by the third-party manufacturer which was subject to such purchase requirements.
	Leases
	The Company leases office space for its headquarters and subsidiaries under non-cancelable operating leases, which will expire between May 2015 and December 2017. The San Jose, California headquarters lease ends March 31, 2016, with a single three-year extension option at rates approximating then-fair market value. Total rent expense for the years ended December 31, 2014, 2013 and 2012 was $2.0 million, $2.0 million and $1.9 million, respectively. The Company recognizes rent expense on a straight-line basis over the lease period, and has accrued for rent expense incurred but not paid.
	Future minimum lease payments at December 31, 2014 under non-cancelable operating leases are as follows:
	(in thousands)	Operating
		leases
	2015	1,764
	2016	610
	2017	107
	Total minimum lease payments	$	2,481
	Indemnifications
	The Company undertakes, in the ordinary course of business, to (i) defend customers and other parties from certain third-party claims associated with allegations of trade secret misappropriation, infringement of copyright, patent or other intellectual property right, or tortious damage to persons or property and (ii) indemnify and hold harmless such parties from certain resulting damages, costs and other liabilities. The term of these undertakings may be perpetual and the maximum potential liability of the Company under certain of these undertakings is not determinable. Based on its historical experience, the Company believes the liability associated with these undertakings is minimal.
	The Company has entered into indemnification agreements with its directors and officers that may require the Company to indemnify its directors and officers against liabilities that may arise by reason of their status or service as directors or officers, other than liabilities arising from willful misconduct of the individual. The Company currently has directors and officers insurance. As there has been no significant history of losses, no expense accrual has been made.
	Securities Litigation
	On August 1 and 21, 2013, two putative securities class action suits were filed in the United States District Court for the Northern District of California against the Company and certain of its officers, its board of directors, a former director and the underwriters for the Company's initial public offering.  On November 20, 2013, the court consolidated the actions as In re Vocera Communications, Inc. Securities Litigation and appointed Lead Plaintiffs.  Lead Plaintiffs filed their consolidated complaint on September 19, 2014.   The consolidated complaint names certain current and former officers and directors and the underwriters for the Company's initial public offering and secondary offering and alleges claims under Sections 11, 12(a)(2) and 15 of the Securities Act and Section 10(b) and 20(a) of the Exchange Act based on allegedly false and materially misleading statements and omissions in the registration statement for the Company's initial public offering and secondary offering and in communications regarding its business and financial results. The suit is purportedly brought on behalf of purchasers of the Company's securities between March 28, 2012 and May 2, 2013, and seeks compensatory damages, rescission, fees and costs, as well as other relief.  On November 3, 2014 Defendants moved to dismiss the consolidated complaint. On January 15, 2015, the Court denied Defendants' motion to dismiss the Exchange Act claims, but granted with leave to amend Defendants' motion to dismiss the Securities Act claims. The time for Lead Plaintiffs to amend the consolidated complaint has not yet passed.
	Due to the inherent uncertainties of litigation, the Company cannot accurately predict the ultimate outcome of this matter. The Company is unable at this time to determine whether the outcome of the litigation would have a material impact on its results of operations, financial condition or cash flow. The Company has not established any reserve for any potential liability relating to this lawsuit because this contingency is not considered probable and reasonably estimable.
	From time to time, the Company may be involved in other lawsuits, claims, investigations and proceedings, consisting of intellectual property, commercial, employment and other matters which arise in the ordinary course of business.

Common_stock

Common stock	12 Months Ended
	Dec. 31, 2014
Disclosure of Compensation Related Costs, Share-based Payments [Abstract]
Common Stock	Common Stock and Share-based Compensation
	The Company’s certificate of incorporation, as amended, authorizes the Company to issue 100 million shares of $0.0003 par value common stock.
	At December 31, 2014, the Company has reserved shares for issuance of common stock as follows:
		Common Shares
	Reserved under stock option plans	622,343
	Warrants to purchase common stock	44,491
	Total reserved for issuance	666,834
	Incentive stock option plans
	The Company has three equity incentive plans: the 2000 Stock Option Plan (the “2000 Plan”), the 2006 Stock Option Plan (the “2006 Plan”) and the 2012 Stock Option Plan (the “2012 Plan”). On March 26, 2012, all shares that were reserved under the 2006 Plan but not subject to outstanding awards became available for grant under the 2012 Plan. No additional shares will be issued under the 2006 Plan. The 2000 Plan terminated in March 2010 and no additional shares will be issued under this plan. All options currently outstanding under the 2000 Plan and the 2006 Plan continue to be governed by the terms and conditions of those plans. Under the 2012 Plan, the Company has the ability to issue incentive stock options (“ISOs”), stock appreciation rights, restricted stock, restricted stock units (“RSUs”), performance awards and stock bonuses. The ISOs will be granted at a price per share not less than the fair value at date of grant. Options granted to new hires generally vest over a 4-year period with 25% vesting at the end of one year and the remaining vest monthly thereafter, options granted as merit awards generally vest monthly over a four-year period. Options granted generally are exercisable up to 10 years. As of December 31, 2014, there were 622,343 shares remaining available for future issuance under the 2012 Plan.
	Early exercise of stock options
	The Company typically allows employees to exercise options granted under the 2000 and 2006 Plans prior to vesting. The unvested shares are subject to the Company’s repurchase right at the original purchase price. The proceeds initially are recorded as an accrued liability from the early exercise of stock options and reclassified to common stock as the Company’s repurchase right lapses. At December 31, 2014, 2013 and 2012, there were unvested shares in the amount of 2,358, 14,360 and 48,260, respectively, which were subject to repurchase at an aggregate price of $12,000, $0.1 million and $0.2 million, respectively.
	Stock Option Activity
	The following table summarizes the combined stock option activity under the 2000 Plan, the 2006 Plan and the 2012 Plan and non-plan stock option agreements:
			Options outstanding
			Number			Weighted			Weighted		Aggregate
			of options			average			average		intrinsic
						exercise			remaining		value
						price			contractual term
									(in years)		(in thousands)
	Outstanding at December 31, 2013		3,287,207			$	9.62		6.45		$	24,880
	Options granted		1,055,949			11.54
	Options exercised		(293,615	)		3.73
	Options canceled		(630,917	)		14.59
	Outstanding at December 31, 2014		3,418,624			$	9.8		6.24		$	12,167
	Options vested and expected to vest as of December 31, 2014		3,318,085			$	9.72		6.15		$	12,100
	Options vested and exercisable as of December 31, 2014		2,076,366			$	7.35		4.49		$	11,346
	At December 31, 2014, there was $6.4 million of unrecognized net compensation cost related to options which is expected to be recognized over a weighted-average period of 2.8 years
	During the year ended December 31, 2014, the Company modified 35,528 outstanding restricted stock units and 84,758 stock options to allow for continued vesting of the awards pursuant to the terms of consulting arrangements entered into with the Company’s former Chief Financial Officer and Executive Chairman.  The stock-based compensation expense recognized during the period and remaining unamortized stock-based compensation expense as of December 31, 2014 for the awards were not material and will be fully recognized by June 30, 2015, the quarter in which the consulting arrangements are expected to terminate.  The share amounts and related compensation expense are included in the options and RSU tables below, as well as in the income statement allocation table. The Company did not grant non-employee options in year ended December 31, 2013.
	Using the Black-Scholes option-pricing model, the weighted-average grant-date fair value of options granted to employees during the years ended December 31, 2014, 2013 and 2012 was $4.77 per share, $7.34 per share and $10.19 per share, respectively. Further information regarding the value of employee options vested and exercised during the years ended December 31, 2014, 2013 and 2012 is set forth below.
			Years ended December 31,
	(in thousands)		2014				2013			2012
	Intrinsic value of options exercised during period		$	2,997			$	5,896		$	24,846
	The Company uses the Black-Scholes option-pricing model to calculate the fair value of stock options on their grant date. This model requires the following major inputs: the estimated fair value of the underlying common stock, the expected term of the option, the expected volatility of the underlying common stock over the expected life of the option, the risk-free interest rate and expected dividend yield. The following assumptions were used for each respective period for employee stock-based compensation:
			Years ended December 31,
			2014		2013		2012
	Expected Term (in years)		5.41 - 5.45		5.38 - 5.43		5.23 - 5.60
	Volatility		41.4% - 48.2%		46.7% - 48.1%		47.9% - 48.7%
	Risk-free interest rate		1.59% - 1.78%		0.81% - 1.80%		0.72% - 1.03%
	Dividend yield		0.00%		0.00%		0.00%
	The computation of expected term is based on the historical exercise and forfeiture behavior of the Company’s employees, giving consideration to the contractual terms of the stock-based awards, vesting schedules and expectations of future employee behavior. For the expected term so determined, the risk-free rate is the U.S. Treasury Rate for that term on the grant date. The Company's expected common stock price volatility is based on the historical volatility of a peer group of publicly-traded companies, using the same expected term. The peer group was selected based on industry and market capitalization data. The Company assumes the dividend yield to be zero, as the Company has never declared or paid dividends and does not expect to do so in the foreseeable future.
	Employee Stock Purchase Plan
	In March 2012, the Company's board of directors and stockholders approved the 2012 Employee Stock Purchase Plan (ESPP). The ESPP allows eligible employees to purchase shares of the Company's common stock at a discount through payroll deductions of up to 15% of their eligible compensation, subject to any plan limitations. The ESPP provides for six-month offering periods, except for the first offering period which was for 11 months. Additionally, in April 2013, the Company's compensation committee determined that following the February 15, 2013 six-month offering period, the next offering period under the ESPP would last for three months (commencing August 15, 2013 and expiring on November 14, 2013) and, following the expiration of such offering period, offering periods thereafter will commence on November 15, 2013, and May 15, 2014 and so on, each consisting of a single six-month purchase period.
	At the end of each offering period, employees are able to purchase shares at 85% of the lower of the fair market value of the Company's common stock on the first trading day of the offering period or on the last day of the offering period. During the year ended December 31, 2014 and 2013, employees purchased 160,936 and 215,039 shares, respectively, of common stock at an average purchase price of $9.87 and $13.92, respectively. As of December 31, 2014, 282,655 shares remained available for future issuance under the ESPP.
	The Company uses the Black-Scholes option-pricing model to calculate the fair value of periodic ESPP offerings on their offer date. The following assumptions were used for each respective period for the ESPP:
			Years ended December 31,
			2014		2013		2012
	Expected Term (in years)		0.5		0.25 - 0.50		0.50 - 0.88
	Volatility		35.9% - 57.7%		33.3% - 36.0%		43.2% - 50.0%
	Risk-free interest rate		0.05% - 0.10%		0.05% - 0.13%		0.14% - 0.18%
	Dividend yield		0.00%		0.00%		0.00%
	Restricted Stock Awards and Restricted Stock Units
	In 2012, the Company began incorporating restricted stock awards and RSUs as an element of its compensation plans. In February 2012, the Company granted certain of its directors restricted stock awards that vest 50% on the first anniversary of the grant, and 50% on the second anniversary of the grant. In May 2012, the Company granted certain employees RSUs, which vest one third on the first anniversary of the grant, one third on the second anniversary of the grant and one third upon the third anniversary of the grant.
	A summary of the restricted stock activity for the year ended December 31, 2014 is presented below:
			Restricted Stock Awards						Restricted Stock Units
			Number of shares			Weighted Average Grant Date Fair Value per Share			Number of shares			Weighted Average Grant Date Fair Value per Share
	Outstanding at December 31, 2013		12,076			$	12.42		755,271			$	19.24
	Granted		—			—			823,554			11.64
	Vested		(12,076	)		12.42			(327,562	)		19.11
	Forfeited		—			—			(188,673	)		16.97
	Outstanding at December 31, 2014		—			$	—		1,062,590			$	13.79
	At December 31, 2014, there was no remaining unrecognized net compensation cost related to restricted stock awards. At December 31, 2014, there was $9.7 million of unrecognized net compensation cost related to RSUs, which is expected to be recognized over a weighted-average period of 1.9 years.
	Allocation of Stock-Based Compensation Expense
	Stock-based compensation expense is recognized based on a straight-line amortization method over the respective vesting period of the award and has been reduced for estimated forfeitures. The Company estimated the expected forfeiture rate based on its historical experience, considering voluntary termination behaviors, trends of actual award forfeitures, and other events that will impact the forfeiture rate. To the extent the Company’s actual forfeiture rate is different from the estimate, the stock-based compensation expense is adjusted accordingly.
	The following table presents the stock-based compensation allocation of expense (both for employees and non-employees):
		Years ended December 31,
(in thousands)		2014				2013			2012
Cost of revenue		$	1,178			$	967		$	421
Research and development		1,056				861			449
Sales and marketing		4,111				2,942			1,262
General and administrative		4,739				3,897			2,100
Total stock-based compensation		$	11,084			$	8,667		$	4,232
Exercise of common stock warrants
Prior to the April 2012 IPO, outstanding warrants to purchase preferred stock were classified as liabilities, which were adjusted to fair value at each reporting period until the earlier of their exercise or expiration or the completion of a liquidation event, including the completion of an initial public offering, at which time the preferred stock warrant liability automatically converted into a warrant to purchase shares of common stock and was reclassified to stockholders’ equity (deficit). The Company recorded an expense in other income (expense), net of $1.6 million for the year ended December 31, 2012, respectively, to reflect the change in the fair value of the outstanding preferred stock warrants. Since April 2012, the converted common stock warrants are classified within stockholder's equity (deficit).

Segments

Segments	12 Months Ended
	Dec. 31, 2014
Segment Reporting [Abstract]
Segments	Segments
	The Company has two operating segments which are both reportable segments: (i) Product; and (ii) Service, which are comprised of the Company’s and its wholly-owned subsidiaries’ results from operations. 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), or decision making group, in deciding how to allocate resources and in assessing performance. The Company’s CODM is its Chief Executive Officer.
	The CODM regularly receives information related to revenue, cost of revenue, and gross profit for each operating segment, and uses this information to assess performance and make resource allocation decisions. All other financial information, including operating expenses and assets, is prepared and reviewed by the CODM on a consolidated basis.
	Assets are not a measure used to assess the performance of the Company by the CODM, therefore the Company does not report assets by segment internally or in its financial statements.
	The following table presents a summary of the operating segments:
		Years ended December 31,
	(in thousands)	2014			2013			2012
	Revenue
	Product	$	51,095		$	62,393		$	65,028
	Service	44,326			40,105			35,929
	Total revenue	95,421			102,498			100,957
	Cost of revenue
	Product	18,766			21,714			21,551
	Service	18,470			16,595			15,070
	Total cost of revenue	37,236			38,309			36,621
	Gross profit
	Product	32,329			40,679			43,477
	Service	25,856			23,510			20,859
	Total gross profit	58,185			64,189			64,336
	Operating expenses	86,264			74,749			59,440
	Interest income (expense), net and other	106			204			(1,376		)
	(Loss) income before income taxes	$	(27,973	)	$	(10,356	)	$	3,520
	The following tables present the Company’s revenue by product line, as well as revenue and long-lived assets by geographic region.
		Years ended December 31,
	(in thousands)	2014			2013			2012
	Revenue
	Product
	Device	$	37,455		$	46,636		$	47,725
	Software	13,640			15,757			17,303
	Total product	51,095			62,393			65,028
	Service
	Maintenance and support	35,353			31,559			26,237
	Professional services and training	8,973			8,546			9,692
	Total service	44,326			40,105			35,929
	Total revenue	$	95,421		$	102,498		$	100,957
	The Company’s revenue by geographic region, based on customer location, is summarized as follows:
		Years ended December 31,
	(in thousands)	2014			2013			2012
	Revenue
	United States	$	86,007		$	91,763		$	90,108
	International	9,414			10,735			10,849
	Total revenue	$	95,421		$	102,498		$	100,957
	The Company’s tangible long-lived assets by geographic region, consisting of net property and equipment, are summarized as follows:
		December 31,
	(in thousands)	2014			2013			2012
	Property and equipment, net
	United States	$	4,852		$	5,249		$	3,465
	International	270			116			166
	Total property and equipment, net	$	5,122		$	5,365		$	3,631

Income_Taxes

Income Taxes	12 Months Ended
	Dec. 31, 2014
Income Tax Disclosure [Abstract]
Income Taxes	Income taxes
	The components of (loss) income before income taxes are as follows:
		Years ended December 31,
	(in thousands)	2014			2013			2012
	United States	$	(28,442	)	$	(10,812	)	$	3,205
	International	469			456			315
	Total (loss) income before income taxes	$	(27,973	)	$	(10,356	)	$	3,520
	The components of the provision for income taxes are as follows:
		Years ended December 31,
	(in thousands)	2014			2013			2012
	Current
	Federal	$	—		$	—		$	7
	State	14			(40		)	512
	Foreign	204			74			38
		218			34			557
	Deferred
	Federal	134			60			60
	State	(4		)	4			10
	Foreign	(24		)	11			—
		106			75			70
	Total income tax provision	$	324		$	109		$	627
	The Company had an effective tax rate of (1.2)%, (1.1)% and 17.8% for the years ended December 31, 2014, 2013 and 2012, respectively.
	Reconciliation of the provision for income taxes at the statutory rate to the Company’s provision for income tax is as follows:
		Years ended December 31,
	(in thousands)	2014			2013			2012
	U.S. federal (tax benefit) provision at statutory rate	$	(9,511	)	$	(3,567	)	$	1,197
	State (tax benefit) income taxes, net of federal benefit	(895		)	(338		)	151
	Foreign income taxes at rates other than the US rate	43			(28		)	(10		)
	Stock-based compensation	763			549			397
	Change in valuation allowance	10,203			3,911			(1,494		)
	Non-deductible warrant expense	—			—			625
	Research and development credits	(466		)	(527		)	(220		)
	Other	187			109			(19		)
	Total	$	324		$	109		$	627
	Deferred income taxes reflect the net tax effects of temporary differences between the carrying amounts of assets and liabilities for financial reporting purposes and the amounts used for income tax purposes. The following table presents the significant components of the Company’s deferred tax assets and liabilities for the periods presented:
		As of December 31,
	(in thousands)	2014			2013
	Deferred tax assets
	Net operating loss carryforward	$	19,190		$	11,873
	Research and development credits	3,360			2,809
	Depreciation and amortization	650			288
	Reserves and accruals	6,900			6,060
	Total deferred tax assets	30,100			21,030
	Valuation allowance	(30,072		)	(21,030		)
	Net deferred tax assets	28			—
	Deferred tax liabilities	(352		)	(216		)
	Net deferred tax liabilities	$	(324	)	$	(216	)
	The Company determines its valuation allowance on deferred tax assets by considering both positive and negative evidence in order to ascertain whether it is more likely than not that deferred tax assets will be realized. Realization of deferred tax assets is dependent upon the generation of future taxable income, if any, the timing and amount of which are uncertain. Due to the history of losses the Company has generated in the past, the Company believes that it is not more likely than not that all of the deferred tax assets in the U.S. and Canada can be realized as of December 31, 2014; accordingly, the Company has recorded a full valuation allowance on its deferred tax assets.
	The Company’s valuation allowance increased by $9.0 million and decreased by $0.2 million for the years ended December 31, 2014 and 2013, respectively. The change in the 2014 valuation allowance was primarily due to the addition of current year loss carryforwards, whereas the decrease in 2013 was primarily due to the expiration and/or limitation of previous loss carryforwards.
	At December 31, 2014, the Company had $71.4 million and $42.6 million, respectively, of federal and state net operating loss carryforwards. Included in the gross amount, approximately $33.9 million of net operating loss is created by excess stock option deduction. A credit to APIC will be recorded when the excess stock option deduction reduces the income tax payable.
	The federal net operating loss carryforward begins expiring in 2022, and the state net operating loss carryforward begins expiring in 2015, if not utilized.
	In addition, the Company has federal research and development tax credits carryforwards of approximately $2.0 million and state research and development tax credit carryforwards of approximately $3.0 million. The federal credit carryforwards begin expiring 2021 and the state credits carry forward indefinitely. The Internal Revenue Code (IRC) contains provisions which limit the amount of net operating loss (NOL) and research credit carryforwards that can be used in any given year if a significant change in ownership has occurred. As of December 31, 2014, $12.2 million of the Company's NOL carryovers and $0.5 million of credit carryovers are subject to an annual $0.6 million limitation, of which $7.5 million NOLs would be available to offset future taxable income in the twenty-year carryforward period.
	The following table displays by contributing factor the changes in the valuation allowance for deferred tax assets since January 1, 2012:
		Years Ended December 31,
	(in thousands)	2014			2013			2012
	Balance at the beginning of the period	$	21,030		$	21,193		$	22,687
	Net operating loss carryforwards generated (utilization)	7,317			(2,397		)	(3,505		)
	R&D tax credit increase	551			172			272
	Depreciation and amortization increase	362			204			29
	Reserves and accruals increase	840			1,558			1,273
	Deferred tax assets decrease (increase)	(28		)	300			437
	Balance at the end of the period	$	30,072		$	21,030		$	21,193
	The following table reflects changes in the unrecognized tax benefits since January 1, 2013:
		Years ended December 31,
(in thousands)	2014			2013
Gross amount of unrecognized tax benefits as of the beginning of the period	$	1,092		$	1,079
Increases related to prior year tax provisions	25			30
Decreases related to prior year tax provisions	—			(239		)
Increases related to current year tax provisions	148			222
Gross amount of unrecognized tax benefits as of the end of the period	$	1,265		$	1,092
As a result of the Company’s historic losses and related valuation allowances, the Company has recorded substantially all of the uncertain tax amounts above as reductions to deferred tax assets which are subject to a full valuation allowance in its consolidated balance sheet with an insignificant portion recorded in other long-term liabilities. The Company recognizes interest and penalties relating to uncertain tax positions in income tax expense. For the years ended December 31, 2014 and 2013, penalties and interest were $13,000 and $26,000, respectively. As the Company is not currently under examination, it is reasonable to assume that the balance of gross unrecognized tax benefits will likely not change in the next twelve months.
The Company files income tax returns in the United States on a federal basis and in various states. The Company is not currently under any international or any United States federal, state and local income tax examinations for any taxable years. All of the Company’s net operating losses and research credit carryforwards prior to 2014 are subject to tax authority adjustment and all years after 2008 are still subject to the tax authority examinations.
The Company has not provided for U.S. federal and foreign withholding taxes on $1.2 million of the Company’s non-U.S. subsidiaries’ undistributed earnings as of December 31, 2014, since the Company intends to reinvest this amount outside the U.S. indefinitely.

Business_Acquisitions_Notes

Business Acquisitions (Notes)	12 Months Ended
	Dec. 31, 2014
mVisum Net Assets Acquired [Abstract]
Business Combination Disclosure [Text Block]
	11	Business acquisitions
	Acquisition of mVisum net assets
	On January 13, 2014, the Company acquired substantially all assets of mVisum, Inc., an innovative provider of alarm management technology solutions for health systems (mVisum), for $3.5 million in cash consideration. The acquisition enabled the Company to enhance its existing platform with complementary communications solutions for healthcare and other mission-critical environments.
	The following table presents the fair value of the identifiable assets acquired and liabilities assumed as of the acquisition date:
	(in thousands)		Fair value of net assets acquired
	Accounts receivable		$	187
	Intangibles
	Developed technology			830
	Non-compete agreement			260
	Customer relationships			170
	Trademarks and trade names			40
	Goodwill			2,103
	Total assets			3,590
	Deferred revenue			(90	)
	Net assets acquired		$	3,500
	The estimated fair values of identifiable intangible assets were primarily determined using discounted cash flow models. The acquired intangible assets are amortized over their estimated useful lives of 4.0 to 7.0 years with a weighted average amortization period of 5.7 years.
	The excess of the acquisition consideration over the fair values of the underlying net assets acquired was recorded as goodwill. Goodwill is largely attributable to the synergy of mVisum’s proprietary solutions with the Company’s existing customer base, dedicated sales force and cross selling opportunities with the Company’s other solutions. Goodwill is not amortized but instead is tested for impairment at least annually or more frequently if indicators of impairment are present. For federal income tax purposes, the entire purchase consideration, including goodwill, is deductible over fifteen years. The goodwill recorded from the acquisition of mVisum is attributed to the Product reporting unit.
	The Company incurred $0.2 million of acquisition-related costs that were expensed as incurred. These costs are recorded as general and administrative expenses in the consolidated statement of operations. Additionally, in connection with the acquisition the Company established a retention bonus plan for mVisum with potential additional compensation over a two-year period of approximately $0.5 million, based on achievement of operating objectives and continued employment. Such amounts are not considered part of the purchase consideration and are being recorded as compensation expense as earned. The acquisition did not result in material contributions to revenue or net loss in the consolidated financial statements since the acquisition date. Additionally, pro forma financial information is not provided for consolidated revenue and net loss as such amounts attributable to mVisum were insignificant.
	Acquisition of Prana Technologies assets
	On August 8, 2014, the Company acquired substantially all assets of Prana Technologies, Inc. (Prana) for $3.45 million in cash consideration. The acquisition provides the Company with technology critical to cloud-based applications extending its communication and collaboration network to include physicians and other geographically dispersed users.  The Company believes this will advance its vision of integrating voice, text, and content-based workflows, on a range of devices and desktop solutions, across all care locations.
	The following table presents the fair value of the identifiable assets acquired and liabilities assumed as of the acquisition date:
	(in thousands)		Fair value of net assets acquired
	Intangibles
	Non-compete agreement		200
	In-process research and development		940
	Goodwill		2,310
	Total assets acquired		3,450
	The estimated fair values of identifiable intangible assets were primarily determined using discounted cash flow models. The non-compete intangible has an estimated useful life of two years and the in-process research and development is classified as an asset with an indefinite life. When the in-process research and development is applied in a generally-available product offering, expected in 2015, it will be assessed for classification as developed technology, and amortization will begin over the estimated useful life of such developed technology.
	The excess of the acquisition consideration over the fair values of the underlying net assets acquired was recorded as goodwill. Goodwill is largely attributable to the synergy of Prana’s proprietary cloud technology expanding upon and being integrated with the Company’s other solutions. Goodwill is not amortized but instead is tested for impairment at least annually or more frequently if indicators of impairment are present. For federal income tax purposes, the entire purchase consideration, including goodwill, is deductible over fifteen years. The goodwill recorded from the acquisition of Prana is attributed to the Product reporting unit.
	The agreement also included contingent payments to the selling stockholders payable based on certain employee retention requirements and the achievement of a post-acquisition quality milestone. The Company considered these contingent payments as a compensation expense due to the explicit and implied continuing employment requirements associated with earning such contingent payments. The company paid $0.8 million in compensation-related elements at the acquisition date, which was amortized in 2014. These costs are recorded primarily as general and administrative expenses in the consolidated statement of operations. In addition, the Company expensed as incurred $0.1 million of acquisition-related costs.
	The acquisition did not result in material contributions to revenue or net loss in the consolidated financial statements since the acquisition date, other than the compensation elements discussed above. Additionally, pro forma financial information is not provided for consolidated revenue and net loss, such amounts attributable to Prana were insignificant.
	Acquisition of mVisum net assets
	On January 13, 2014, the Company acquired substantially all assets of mVisum, Inc., an innovative provider of alarm management technology solutions for health systems (mVisum), for $3.5 million in cash consideration. The acquisition enabled the Company to enhance its existing platform with complementary communications solutions for healthcare and other mission-critical environments.
	The following table presents the fair value of the identifiable assets acquired and liabilities assumed as of the acquisition date:
	(in thousands)		Fair value of net assets acquired
	Accounts receivable		$	187
	Intangibles
	Developed technology			830
	Non-compete agreement			260
	Customer relationships			170
	Trademarks and trade names			40
	Goodwill			2,103
	Total assets			3,590
	Deferred revenue			(90	)
	Net assets acquired		$	3,500
	The estimated fair values of identifiable intangible assets were primarily determined using discounted cash flow models. The acquired intangible assets are amortized over their estimated useful lives of 4.0 to 7.0 years with a weighted average amortization period of 5.7 years.
	The excess of the acquisition consideration over the fair values of the underlying net assets acquired was recorded as goodwill. Goodwill is largely attributable to the synergy of mVisum’s proprietary solutions with the Company’s existing customer base, dedicated sales force and cross selling opportunities with the Company’s other solutions. Goodwill is not amortized but instead is tested for impairment at least annually or more frequently if indicators of impairment are present. For federal income tax purposes, the entire purchase consideration, including goodwill, is deductible over fifteen years. The goodwill recorded from the acquisition of mVisum is attributed to the Product reporting unit.
	The Company incurred $0.2 million of acquisition-related costs that were expensed as incurred. These costs are recorded as general and administrative expenses in the consolidated statement of operations. Additionally, in connection with the acquisition the Company established a retention bonus plan for mVisum with potential additional compensation over a two-year period of approximately $0.5 million, based on achievement of operating objectives and continued employment. Such amounts are not considered part of the purchase consideration and are being recorded as compensation expense as earned. The acquisition did not result in material contributions to revenue or net loss in the consolidated financial statements since the acquisition date. Additionally, pro forma financial information is not provided for consolidated revenue and net loss as such amounts attributable to mVisum were insignificant.
	Acquisition of Prana Technologies assets
	On August 8, 2014, the Company acquired substantially all assets of Prana Technologies, Inc. (Prana) for $3.45 million in cash consideration. The acquisition provides the Company with technology critical to cloud-based applications extending its communication and collaboration network to include physicians and other geographically dispersed users.  The Company believes this will advance its vision of integrating voice, text, and content-based workflows, on a range of devices and desktop solutions, across all care locations.
	The following table presents the fair value of the identifiable assets acquired and liabilities assumed as of the acquisition date:
	(in thousands)		Fair value of net assets acquired
	Intangibles
	Non-compete agreement		200
	In-process research and development		940
	Goodwill		2,310
	Total assets acquired		3,450
	The estimated fair values of identifiable intangible assets were primarily determined using discounted cash flow models. The non-compete intangible has an estimated useful life of two years and the in-process research and development is classified as an asset with an indefinite life. When the in-process research and development is applied in a generally-available product offering, expected in 2015, it will be assessed for classification as developed technology, and amortization will begin over the estimated useful life of such developed technology.
	The excess of the acquisition consideration over the fair values of the underlying net assets acquired was recorded as goodwill. Goodwill is largely attributable to the synergy of Prana’s proprietary cloud technology expanding upon and being integrated with the Company’s other solutions. Goodwill is not amortized but instead is tested for impairment at least annually or more frequently if indicators of impairment are present. For federal income tax purposes, the entire purchase consideration, including goodwill, is deductible over fifteen years. The goodwill recorded from the acquisition of Prana is attributed to the Product reporting unit.
	The agreement also included contingent payments to the selling stockholders payable based on certain employee retention requirements and the achievement of a post-acquisition quality milestone. The Company considered these contingent payments as a compensation expense due to the explicit and implied continuing employment requirements associated with earning such contingent payments. The company paid $0.8 million in compensation-related elements at the acquisition date, which was amortized in 2014. These costs are recorded primarily as general and administrative expenses in the consolidated statement of operations. In addition, the Company expensed as incurred $0.1 million of acquisition-related costs.
	The acquisition did not result in material contributions to revenue or net loss in the consolidated financial statements since the acquisition date, other than the compensation elements discussed above. Additionally, pro forma financial information is not provided for consolidated revenue and net loss, such amounts attributable to Prana were insignificant.

Quarterly_results_of_operation

Quarterly results of operations (unaudited) (Notes)	12 Months Ended
	Dec. 31, 2014
Quarterly Financial Information Disclosure [Abstract]
Schedule of Quarterly Financial Information [Table Text Block]	12. Quarterly results of operations (unaudited)
	The following tables present certain unaudited consolidated quarterly financial information for each of the eight quarters ended December 31, 2014. This quarterly information has been prepared on the same basis as the consolidated financial statements and includes all adjustments necessary to state fairly the information for the periods presented.
	(In thousands, except per share data)	Quarter Ended
	2014	March 31,			June 30,			September 30,			December 31,
	Total revenue	$	24,676		$	23,019		$	23,124		$	24,602
	Gross profit	$	14,872		$	14,070		$	13,535		$	15,708
	Net loss	$	(6,389	)	$	(7,008	)	$	(7,891	)	$	(7,009	)
	Net loss attributable to common stockholders	$	(6,389	)	$	(7,008	)	$	(7,891	)	$	(7,009	)
	Net loss per share attributable to common stockholders:
	Basic and diluted	$	(0.26	)	$	(0.28	)	$	(0.31	)	$	(0.27	)
	Weighted average shares used to compute net income (loss) per share attributable to common stockholders:
	Basic and diluted	25,047			25,246			25,432			25,572
		Quarter Ended
	2013	March 31,			June 30,			September 30,			December 31,
	Total revenue	$	22,413		$	25,296		$	26,067		$	28,722
	Gross profit	$	13,719		$	15,790		$	16,277		$	18,403
	Net loss	$	(3,499	)	$	(2,022	)	$	(3,102	)	$	(1,842	)
	Net loss attributable to common stockholders	$	(3,499	)	$	(2,022	)	$	(3,102	)	$	(1,842	)
	Net loss per share attributable to common stockholders:
	Basic and diluted	$	(0.14	)	$	(0.08	)	$	(0.13	)	$	(0.07	)
	Weighted average shares used to compute net loss per common share:
	Basic and diluted	24,282			24,555			24,747			24,893
	The following tables present certain unaudited consolidated quarterly financial information for each of the eight quarters ended December 31, 2014. This quarterly information has been prepared on the same basis as the consolidated financial statements and includes all adjustments necessary to state fairly the information for the periods presented.
	(In thousands, except per share data)	Quarter Ended
	2014	March 31,			June 30,			September 30,			December 31,
	Total revenue	$	24,676		$	23,019		$	23,124		$	24,602
	Gross profit	$	14,872		$	14,070		$	13,535		$	15,708
	Net loss	$	(6,389	)	$	(7,008	)	$	(7,891	)	$	(7,009	)
	Net loss attributable to common stockholders	$	(6,389	)	$	(7,008	)	$	(7,891	)	$	(7,009	)
	Net loss per share attributable to common stockholders:
	Basic and diluted	$	(0.26	)	$	(0.28	)	$	(0.31	)	$	(0.27	)
	Weighted average shares used to compute net income (loss) per share attributable to common stockholders:
	Basic and diluted	25,047			25,246			25,432			25,572
		Quarter Ended
	2013	March 31,			June 30,			September 30,			December 31,
	Total revenue	$	22,413		$	25,296		$	26,067		$	28,722
	Gross profit	$	13,719		$	15,790		$	16,277		$	18,403
	Net loss	$	(3,499	)	$	(2,022	)	$	(3,102	)	$	(1,842	)
	Net loss attributable to common stockholders	$	(3,499	)	$	(2,022	)	$	(3,102	)	$	(1,842	)
	Net loss per share attributable to common stockholders:
	Basic and diluted	$	(0.14	)	$	(0.08	)	$	(0.13	)	$	(0.07	)
	Weighted average shares used to compute net loss per common share:
	Basic and diluted	24,282			24,555			24,747			24,893

The_Company_and_Summary_of_Sig1

The Company and Summary of Significant Accounting Policies (Policies)	12 Months Ended
	Dec. 31, 2014
Accounting Policies [Abstract]
Basis of Presentation	Basis of presentation
	The consolidated financial statements include the accounts of Vocera Communications, Inc. and its wholly owned subsidiaries. All inter-company transactions and balances have been eliminated in consolidation. The accompanying notes are prepared in accordance with accounting principles generally accepted in the United States (GAAP).
Consolidation	The consolidated financial statements include the accounts of Vocera Communications, Inc. and its wholly owned subsidiaries. All inter-company transactions and balances have been eliminated in consolidation.
Use of Estimates	Use of estimates
	The preparation of financial statements in conformity with GAAP requires the Company 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 expense during the reporting periods. The estimates include, but are not limited to, revenue recognition, warranty reserves, inventory reserves, stock-based compensation expense, provisions for income taxes and contingencies. Actual results could differ from these estimates, and such differences could be material to the Company’s financial position and results of operations.
Cash, Cash Equivalents and Short-term Investments	Cash, cash equivalents and short-term investments
	The Company’s cash equivalents and short-term investments consist of money market funds, commercial paper, U.S. government agency notes, U.S. Treasury notes, municipal debt and corporate debt. These investments are classified as available-for-sale securities and are carried at fair value with the unrealized gains and losses reported as a component of stockholders’ equity. Management determines the appropriate classification of its investments at the time of purchase and re-evaluates the available-for-sale designations as of each balance sheet date. Investments with an original purchase maturity of less than three months are classified as cash equivalents, all those with longer maturities are classified as short-term investments, which are available-for-sale.
Restricted Cash	Restricted cash
	Restricted cash was $0.1 million and $0.3 million at December 31, 2014 and 2013, respectively, the majority of which is security for a corporate travel card facility and credit card processing services. All restricted cash is classified as current, under prepaids and other current assets on the consolidated balance sheet, based on the underlying terms of the arrangements.
Allowance for Doubtful Accounts	Allowance for doubtful accounts
	The allowance for doubtful accounts reflects the Company’s best estimate of probable losses inherent in the Company’s receivables portfolio determined on the basis of historical experience, specific allowances for known troubled accounts and other currently available evidence. The Company has not experienced significant credit losses from its accounts receivable. The Company performs a regular review of its customers’ payment histories and associated credit risks as it does not require collateral from its customers.
	The following table presents the changes in the allowance for doubtful accounts:
			Years ended December 31,
	(in thousands)		2014			2013			2012
	Allowance—beginning of period		$	(6	)	$	—		$	—
	Provisions for bad debts		(53		)	(29		)	—
	Recoveries from bad debts		4			13			—
	Write-offs and other		2			10			—
	Allowance—end of period		$	(53	)	$	(6	)	$	—
Inventories	Inventories
	Inventories are valued at the lower of standard cost (which approximates actual cost on a first-in, first-out basis) or market (net realizable value or replacement cost). The Company assesses the valuation of inventory and periodically writes down the value for estimated excess and obsolete inventory based upon assumptions about future demand and market conditions.
Concentration of credit risk and other risks and uncertainties	Concentration of credit risk and other risks and uncertainties
	Financial instruments that subject the Company to concentration of credit risk consist primarily of cash, cash equivalents and short-term investments. The Company’s cash and cash equivalents are primarily deposited with high quality financial institutions and in money market funds. Deposits at these institutions and funds may, at times, exceed federally insured limits. Management believes that these financial institutions and funds are financially sound and, accordingly, that minimal credit risk exists. The Company has not experienced any losses on its deposits of cash and cash equivalents. Marketable securities are stated at fair value, and accounted for as available-for-sale within short-term investments. The counterparties to the agreements relating to the Company’s investment securities consist of major corporations, financial institutions and government agencies of high credit standing.
	The primary hardware component of the Company’s products is currently manufactured by a third-party contractor in Mexico. A significant disruption in the operations of this contractor may impact the production of the Company’s products for a substantial period of time, which could harm the Company’s business, financial condition and results of operations.
	Concentration of credit risk with respect to trade accounts receivable is considered to be limited due to the diversity of the Company’s customer base and geographic sales areas. At December 31, 2014 and 2013, no customer accounted for 10% or more of accounts receivable. For the years ended December 31, 2014, 2013 and 2012, no customer represented 10% or more of revenue.
Property and Equipment	Property and equipment
	Property and equipment are stated at cost and depreciated on a straight-line basis over the estimated useful economic lives of the assets. Assets generally have useful economic lives of three years except for leasehold improvements, which are amortized using the straight-line method over the shorter of the remaining lease term or the estimated useful life of the related assets. Purchased or developed software also generally has a three year useful economic life, except for major ERP implementations, for which the Company assumes a five year useful economic life. Upon retirement or sale, the cost and related accumulated depreciation and amortization are removed from the consolidated balance sheet and the resulting gain or loss is reflected in operations. Maintenance and repairs which are not considered improvements and do not extend the useful life of the assets are charged to operations as incurred.
	The Company periodically reviews property and equipment for impairment whenever events or changes in circumstances indicate that the carrying amount of an asset is impaired or the estimated useful lives are no longer appropriate. Fair value is estimated based on discounted future cash flows. If indicators of impairment exist and the undiscounted projected cash flows associated with such assets are less than the carrying amount of the asset, an impairment loss is recorded to write the asset down to its estimated fair values. To date, the Company has not recorded any impairment charges.
Software Development Costs	Software development costs.
	For internal-use software, the Company capitalizes certain internal and external costs incurred in its acquisition and creation. Capitalized internal-use software is included in property and equipment when development is complete and is amortized on a straight-line basis over the estimated useful life of the related asset, generally three years, except that five years is assumed for major ERP implementations. Based on the authoritative guidance, costs incurred either before or after the period satisfying the capitalization criteria, together with costs incurred for training and maintenance, are expensed as incurred. For the years ended December 31, 2014, 2013 and 2012, the Company capitalized costs of $0.2 million, $2.1 million and $1.1 million, respectively.
Goodwill and Intangible Assets	Goodwill and intangible assets
	The Company allocates the purchase price of any acquisitions to tangible assets and liabilities and identifiable intangible assets acquired. Any residual purchase price is recorded as goodwill.
	Goodwill
	Goodwill is tested for impairment at the reporting unit level at least annually as of September 30, or more often if events or changes in circumstances indicate the carrying value may not be recoverable. As of December 31, 2014, no changes in circumstances indicate that goodwill carrying values may not be recoverable. The Company has identified two operating segments (Product and Service) which management also considers to be reporting units.
	Intangible assets
	Intangible assets are amortized over their estimated useful lives. Upon completion of development, acquired in-process research and development assets are generally considered amortizable, finite-lived assets and are amortized over their estimated useful lives. Finite-lived intangible assets consist of customer relationships, developed technology, trademarks and non-compete agreements. The Company evaluates 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 is recognized in the period of identification to the extent the carrying amount of an asset exceeds the fair value of such asset. No impairment of intangible assets was recorded in 2014, 2013 or 2012.
Stockholders' Equity, Policy	Convertible preferred stock
	Prior to the Company’s IPO, the Company had issued and outstanding six series of convertible preferred stock. In connection with the Company’s IPO, in April 2012, each share of then-outstanding preferred stock automatically converted into common stock. In the statement of shareholders' equity for the year ended December 31, 2012, this was recorded as non-cash conversion of $53.4 million from preferred stock to common stock.
Revenue Recognition, Policy	Revenue recognition
	The Company derives revenue from the sales of communication badges, smartphones, perpetual software licenses for software that is essential to the functionality of the communication badges, software maintenance, extended product warranty and professional services. The Company also derives revenue from the sale of licenses for software that is not essential to the functionality of the communication badges. Sales tax is excluded from reported total revenue.
	Revenue is recognized when all of the below criteria are met:
	•	there is persuasive evidence that an arrangement exists, in the form of a written contract, amendments to that contract, or purchase orders from a third party;
	•	delivery has occurred or services have been rendered;
	•	the price is fixed or determinable after evaluating the risk of concession; and
	•	collectability is reasonably assured based on customer creditworthiness and past history of collection.
	In arrangements with multiple deliverables, assuming all other revenue criteria are met, the Company recognizes revenue for individual delivered items if they have value to the customer on a standalone basis. The Company allocates arrangement consideration at the inception of the arrangement to all deliverables using the relative selling price method. This method requires us to determine the selling price at which each deliverable could be sold if it were sold regularly on a standalone basis. When available, we use vendor-specific objective evidence ("VSOE") of the selling price. VSOE represents the price charged for a deliverable when it is sold separately, or for a deliverable not yet being sold separately, the price established by management with the relevant authority. The Company has established VSOE of the selling price for our post-installation technical support services and professional services. When VSOE of selling price is not available, third-party evidence ("TPE") of selling price for similar products and services is acceptable; however, our offerings and market strategy differ from those of our competitors, such that the Company cannot obtain sufficient comparable information about third parties' prices. If neither VSOE nor TPE are available, the Company uses its best estimates of selling prices ("BESP"). The Company determines BESP considering factors such as market conditions, sales channels, internal costs and product margin objectives and pricing practices. The Company regularly reviews and update our VSOE and BESP information.
	The relative selling price method allocates total arrangement consideration proportionally to each deliverable on the basis of its estimated selling price. In addition, the amount recognized for any delivered items cannot exceed that which is contingent upon delivery of any remaining items in the arrangement.
	A typical sales arrangement involves multiple elements, such as sales of communication badges, perpetual software licenses, professional services and maintenance services which entitle customers to unspecified upgrades, bug fixes, patch releases and telephone support. Revenue from the sale of communication badges and perpetual software licenses is recognized upon shipment or delivery at the customers’ premises as the contractual provisions governing sales of these products do not include any provisions regarding acceptance, performance or general right of return or cancellation or termination provisions adversely affecting revenue recognition. Revenue from the sale of maintenance services on software licenses is recognized over the period during which the services are provided, which is generally one year. Revenue from professional services is recognized either on a fixed fee basis based on milestones or on a time and materials basis as the services are provided, both of which generally take place over a period of two to twelve weeks.
	For non-essential software arrangements with multiple-deliverables, including license, professional services and maintenance, the Company recognizes license revenue using the residual method of accounting pursuant to relevant software revenue recognition guidance. Under the residual method, revenue is recognized when VSOE for fair value exists for all of the undelivered elements in the arrangement, but does not exist for one or more of the delivered elements in the arrangement. If evidence of fair value cannot be established for the undelivered elements, all of the revenue is deferred until evidence of fair value can be established, or until the items for which evidence of fair value cannot be established are delivered. For maintenance and certain professional services, the Company has established VSOE. The Company's revenue arrangements do not include a general right of return relative to the delivered products.
	Revenue from sales-type leases
	A portion of the Company's sales are made through multi-year lease agreements with customers. When these arrangements are considered sales-type leases, upon delivery of leased products to customers, the Company recognizes revenue for such products in an amount equal to the net present value of the minimum lease payments. Unearned income is recognized as part of product revenue under the effective interest method. The Company recognizes revenue related to certain executory costs, including maintenance and extended warranty, ratable over the term of the underlying arrangements. The Company recognizes revenue related to battery refresh executory costs when such executory costs are incurred.
	Proceeds from transfers of sales-type leases to third-party financial companies are allocated between the net investment in sales-type leases and the executory cost component for remaining service obligations based on relative present value. The difference between the amount of proceeds allocated to the net investment in lease and the carrying value of the net investment in lease is included in product revenue. Proceeds allocated to the executory cost component are accounted for as financing liabilities.
	For the year ended December 31, 2014, the Company transferred $1.4 million of lease receivables, recording an immaterial net loss and $0.6 million of new financing liabilities for future performance of executory service obligations. For the year ended December 31, 2013, the Company transferred $2.2 million of lease receivables, recording an immaterial net gain and $0.8 million of new financing liabilities for future performance of executory service obligations.
	For lease receivables retained as of December 31, 2014 and 2013, the Company recorded $0.9 million and $1.4 million, respectively, of net investment in sales-type leases, equivalent to the minimum lease payments for the delivered product.
Revenue Recognition, sales type leases	Revenue from sales-type leases
	A portion of the Company's sales are made through multi-year lease agreements with customers. When these arrangements are considered sales-type leases, upon delivery of leased products to customers, the Company recognizes revenue for such products in an amount equal to the net present value of the minimum lease payments. Unearned income is recognized as part of product revenue under the effective interest method. The Company recognizes revenue related to certain executory costs, including maintenance and extended warranty, ratable over the term of the underlying arrangements. The Company recognizes revenue related to battery refresh executory costs when such executory costs are incurred.
	Proceeds from transfers of sales-type leases to third-party financial companies are allocated between the net investment in sales-type leases and the executory cost component for remaining service obligations based on relative present value. The difference between the amount of proceeds allocated to the net investment in lease and the carrying value of the net investment in lease is included in product revenue. Proceeds allocated to the executory cost component are accounted for as financing liabilities.
	For the year ended December 31, 2014, the Company transferred $1.4 million of lease receivables, recording an immaterial net loss and $0.6 million of new financing liabilities for future performance of executory service obligations. For the year ended December 31, 2013, the Company transferred $2.2 million of lease receivables, recording an immaterial net gain and $0.8 million of new financing liabilities for future performance of executory service obligations.
	For lease receivables retained as of December 31, 2014 and 2013, the Company recorded $0.9 million and $1.4 million, respectively, of net investment in sales-type leases, equivalent to the minimum lease payments for the delivered product.
Commissions Expense, Policy	Commissions expense
	Sales commissions are recorded as sales and marketing expense and accrued as a current liability as orders are recorded; thus no contract acquisition costs are capitalized.
Shipping and Handling Costs	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.
Research and Development Expenditures	Research and development expenditures
	Research and development costs are charged to operations as incurred. Software development costs incurred prior to the establishment of technological feasibility are included in research and development and are expensed as incurred. After technological feasibility is established, material software development costs up to general availability of the software will be capitalized and amortized on a straight-line basis over the estimated product life, or based on the ratio of current revenues to total projected product revenues, whichever is greater. To date, the time between the establishment of technological feasibility and general availability has been very short and therefore no significant costs have been incurred. Accordingly, the Company has not capitalized any software development costs.
Advertising Costs	Advertising costs
	Advertising costs are included in sales and marketing expense and are expensed as incurred. Advertising costs for the years ended December 31, 2014, 2013 and 2012 were immaterial.
Product Warranties	Product warranties
	The Company offers warranties on certain products and records a liability for the estimated future costs associated with warranty claims, which is based upon historical experience and the Company’s estimate of the level of future costs. The Company provides for the estimated costs of hardware warranties at the time the related revenue is recognized. Costs are estimated based on historical and projected product failure rates, historical and projected repair costs, and knowledge of specific product failures (if any). The specific hardware warranty includes parts and labor over a period generally ranging from one to three years. The Company provides no warranty for software. The Company regularly re-evaluates its estimates to assess the adequacy of the recorded warranty liabilities and adjust the amounts as necessary. Warranty costs are reflected in the consolidated statement of operations as cost of sales.
Product Warranties	The Company provides for the estimated costs of hardware warranties at the time the related revenue is recognized. Costs are estimated based on historical and projected product failure rates, historical and projected repair costs, and knowledge of specific product failures (if any). The specific hardware warranty includes parts and labor over a period generally ranging from one to three years. The Company provides no warranty for software. The Company regularly re-evaluates its estimates to assess the adequacy of the recorded warranty liabilities and adjust the amounts as necessary.
	A reconciliation of the changes in the Company’s warranty reserve for the years ended December 31, 2014, 2013 and 2012 is as follows:
			Years ended December 31,
	(in thousands)		2014			2013			2012
	Warranty balance at the beginning of the period		$	840		$	297		$	983
	Warranty expense accrued for shipments during the period		723			1,185			540
	Changes in estimate related to pre-existing warranties		(68		)	536			(242		)
	Warranty settlements made		(998		)	(1,178		)	(984		)
	Warranty balance at the end of the period		$	497		$	840		$	297
Stock-based Compensation	Stock-based compensation
	For options granted to employees, stock-based compensation is measured at grant date based on the fair value of the award and is expensed on a straight-line basis over the requisite service period. The Company determines the grant date fair value of the options using the Black-Scholes option-pricing model. Restricted stock awards and restricted stock units, first awarded in 2012, result in compensation expense, and are recognized on a straight-line basis over the requisite service period, based on the award date closing stock price. Equity instruments issued to non-employees are recorded at their fair value on the measurement date and are subject to periodic adjustment as the underlying equity instruments vest. The fair value of options granted to non-employees is amortized over the vesting period, on a straight-line basis.
	For stock options issued to employees and non-employees with specific performance criteria, the Company makes a determination at each balance sheet date whether the performance criteria are probable of being achieved. Compensation expense is recognized until such time as the performance criteria are met or when it is probable that the criteria will not be met.
	The Company will only recognize a tax benefit from stock-based awards in additional paid-in capital if an incremental tax benefit is realized after all other tax attributes currently available to the Company have been utilized. In addition, the Company has elected to account for the indirect effects of stock-based awards on other tax attributes, such as the research tax credit, through its statement of operations.
Income Taxes	Income taxes
	The Company uses the asset and liability method of accounting for income taxes. Under this method, the Company records deferred income taxes based on temporary differences between the financial reporting and tax bases of assets and liabilities and use enacted tax rates and laws that the Company expects will be in effect when they recover those assets or settle those liabilities, as the case may be, to measure those taxes. In cases where the expiration date of tax carryforwards or the projected operating results indicate that realization is not likely, the Company provides for a valuation allowance. Valuation allowances are established when necessary to reduce deferred tax assets to the amounts expected to be realized.
	The Company has deferred tax assets, resulting from net operating losses, research and development credits and temporary differences that may reduce taxable income in future periods. A valuation allowance is required when it is more likely than not that all or a portion of a deferred tax asset will not be realized. In assessing the need for a valuation allowance, the Company estimates future taxable income, considering the feasibility of ongoing tax-planning strategies and the realizability of tax loss carryforwards. Valuation allowances related to deferred tax assets can be impacted by changes in tax laws, changes in statutory tax rates and future taxable income levels. If the Company were to determine that it would be able to realize its deferred tax assets in the future in excess of the net carrying amounts, it would decrease the recorded valuation allowance through an increase to income in the period in which that determination is made. Due to the history of losses the Company has generated in the past, the Company believes that it is not more likely than not that all of the deferred tax assets in the U.S. and Canada can be realized as of December 31, 2014 and 2013, respectively. Accordingly, the Company has recorded a full valuation allowance on its deferred tax assets for these years.
	At December 31, 2014, the Company had a valuation allowance against net deferred tax assets of $30.1 million.
	There is inherent uncertainty in evaluating the sustainability of the income tax positions the Company takes on its tax returns. The Company assesses its income tax positions and records tax benefits for all years subject to examination based upon management’s evaluation of the facts, circumstances and information available at the reporting date. For those tax positions where it is more likely than not that a tax benefit will be sustained, the Company has recorded the highest amount of tax benefit with a greater than 50% likelihood of being realized upon ultimate settlement with a taxing authority that has full knowledge of all relevant information. For those income tax positions where it is not more likely than not that a tax benefit will be realizable, no tax benefit has been recognized in the financial statements.
	The Company includes interest and penalties with income taxes in the accompanying statement of operations. All of the Company’s net operating losses and research credit carryforwards prior to 2014 are subject to tax authority adjustment and all years after 2010 are still subject to tax authority examinations. The Company is currently not subject to any income tax audit examinations by tax authorities in any jurisdictions including U.S. federal, state and local or foreign countries.
Foreign Currency Translation	Foreign currency translation
	The functional currency of the Company’s foreign subsidiaries is the U.S. dollar.  Accordingly, monetary assets and liabilities in non-functional currency of these subsidiaries are remeasured using exchange rates in effect at the end of the period. Revenues and costs in local currency are remeasured using average exchange rates for the period, except for costs related to those consolidated balance sheet items that are remeasured using historical exchange rates. The resulting remeasurement gains and losses are included in the Company’s consolidated statements of operations. Translation gains and losses have not been significant to date
Segments	Segments
	Operating segments are components of an enterprise for which separate financial information is available and is evaluated regularly by the Company’s chief operating decision maker in deciding how to allocate resources and in assessing performance. The Company’s chief operating decision maker is the Chief Executive Officer. The Company has two operating segments which are both reportable business segments: (i) Product; and (ii) Service.
Comprehensive Income (Loss)	Comprehensive income (loss)
	For the years ended December 31, 2014, 2013 and 2012, the Company had nominal unrealized gains on available-for-sale securities. There were no other components within other comprehensive income for the years ended December 31, 2014
Related Party Transactions Disclosure	Related party transactions
	During the years ended December 31, 2014, 2013 and 2012, the Company billed a related party, the University of Chicago Medical Center (UCMC), $0.3 million, $0.5 million and $0.5 million, respectively, for consulting services and technology solutions. One of the Company's board members is the President of UCMC. These transactions were recorded at arms-length prices. During the year ended December 31, 2013, the Company billed a related party, the Hewlett-Packard Company, approximately $9,200 for software and support, at arms’ length prices. Through July of 2013, John N. McMullen, one of the Company’s directors, served as Treasurer & Senior Vice President at Hewlett-Packard. There were no material related party transactions for Hewlett-Packard in the year ended December 31, 2012.
Recent Accounting Pronouncements	Recent accounting pronouncements
	In May 2014, the FASB together with the International Accounting Standards Board issued converged guidance for revenue recognition that will replace most existing guidance, eliminate industry-specific guidance and provide a unified model for determining how and when revenue from contracts with customers should be recognized. Under the new guidance, an entity should recognize revenue to depict the transfer of promised goods or services to customers in an amount that reflects the consideration to which the entity expects to be entitled in exchange for those goods or services. The standard will also introduce additional disclosures, changes in asset and liability accounting, and changes in gain/loss recognition for asset transfers unrelated to customer transactions.
	The Company’s effective date for this standard will be the first quarter of 2017; early application is not permitted. Two methods of transition are provided: a full retrospective approach, with certain practical expedients allowed, and a cumulative effect method, with balance sheet adjustment as of January 1, 2017. The Company is evaluating the effect the new standard will have on its consolidated financial statements and related disclosures. The Company has not yet selected a transition method nor has it determined the future effect of the standard on its financial position or results of operations.

The_Company_and_Summary_of_Sig2

The Company and Summary of Significant Accounting Policies The Company and Summary of Significant Accounting Policies(Tables)	12 Months Ended
	Dec. 31, 2014
Allowance for Doubtful Accounts [Abstract]
Allowance for Credit Losses on Financing Receivables [Table Text Block]	The following table presents the changes in the allowance for doubtful accounts:
		Years ended December 31,
	(in thousands)	2014			2013			2012
	Allowance—beginning of period	$	(6	)	$	—		$	—
	Provisions for bad debts	(53		)	(29		)	—
	Recoveries from bad debts	4			13			—
	Write-offs and other	2			10			—
	Allowance—end of period	$	(53	)	$	(6	)	$	—

Fair_value_of_financial_instru1

Fair value of financial instruments (Tables)	12 Months Ended
	Dec. 31, 2014
Fair Value Disclosures [Abstract]
Schedule of assets and liabilities measured at fair value on a recurring basis, by level	The table below summarizes the Company’s assets that are measured at fair value on a recurring basis, by level, within the fair value hierarchy as of December 31, 2014 and 2013, respectively. There were no liabilities measured at fair value on a recurring basis for these dates.
		31-Dec-14						31-Dec-13
	(in thousands)	Level 1		Level 2		Total		Level 1		Level 2		Total
	Assets
	Money market funds	$	7,795	$	—	$	7,795	$	22,991	$	—	$	22,991
	Commercial paper	—		3,225		3,225		—		900		900
	U.S. government agency securities	—		5,955		5,955		—		11,279		11,279
	U.S. Treasury securities	—		4,043		4,043		—		5,235		5,235
	Municipal debt securities	—		3,924		3,924		—		4,765		4,765
	Corporate debt securities	—		82,517		82,517		—		67,055		67,055
	Total assets measured at fair value	$	7,795	$	99,664	$	107,459	$	22,991	$	89,234	$	112,225

Cash_Cash_Equivalents_and_Shor1

Cash, Cash Equivalents and Short-term Investments (Tables)	12 Months Ended
	Dec. 31, 2014
Cash and Cash Equivalents [Abstract]
Schedule of cash, cash equivalents and available-for-sale investments	he following tables display gross unrealized gains and gross unrealized losses for cash, cash equivalents and available-for-sale investments for the periods presented:
		As of December 31, 2014
	(in thousands)	Amortized		Unrealized		Unrealized			Fair
		Cost		Gains		Losses			value
	Cash and cash equivalents:
	Demand deposits and other cash	$	8,802	$	—	$	—		$	8,802
	Money market funds	7,795		—		—			7,795
	Commercial paper	1,365		—		—			1,365
	U.S. government agency securities	100		—		—			100
	Corporate debt securities	4,553		—		—			4,553
	Total cash and cash equivalents	22,615		—		—			22,615
	Short-Term Investments:
	Commercial paper	1,860		—		—			1,860
	U.S. government agency securities	5,856		1		(2		)	5,855
	U.S. Treasury securities	4,042		1		—			4,043
	Municipal debt securities	3,922		2		—			3,924
	Corporate debt securities	78,044		5		(85		)	77,964
	Total short-term investments	93,724		9		(87		)	93,646
	Total cash, cash equivalents and short-term investments	$	116,339	$	9	$	(87	)	$	116,261
		As of December 31, 2013
	(in thousands)	Amortized Cost		Unrealized Gains		Unrealized Losses			Fair value
	Cash and cash equivalents:
	Demand deposits and other cash	$	15,451	$	—	$	—		$	15,451
	Money market funds	22,991		—		—			22,991
	Commercial paper	150		—		—			150
	Corporate debt securities	1,060		—		—			1,060
	Total cash and cash equivalents	39,652		—		—			39,652
	Short-Term Investments:
	Commercial paper	750		—		—			750
	U.S. government agency securities	11,275		5		(1		)	11,279
	U.S. Treasury securities	5,233		2		—			5,235
	Municipal debt securities	4,758		7		—			4,765
	Corporate debt securities	65,982		20		(7		)	65,995
	Total short-term investments	87,998		34		(8		)	88,024
	Total cash, cash equivalents and short-term investments	$	127,650	$	34	$	(8	)	$	127,676
Investments Classified by Contractual Maturity Date [Table Text Block]	Classification of the cash, cash equivalent and short-term investments by contractual maturity was as follows:
	(in thousands)	One year or shorter		Between 1 and 2 years		Total
	Balances as of December 31, 2014
	Cash and cash equivalents (1)	$	22,615	$	—	$	22,615
	Short-term investments	76,917		16,729		93,646
	Cash, cash equivalents and short-term investments	99,532		16,729		116,261
	Balances as of December 31, 2013
	Cash and cash equivalents (1)	$	39,652	$	—	$	39,652
	Short-term investments	71,464		16,560		88,024
	Cash, cash equivalents and short-term investments	$	111,116	$	16,560	$	127,676
	(1) Includes demand deposits and other cash, money market funds and other cash equivalent securities, all with 0-90 day maturity at purchase.
	All the above tables exclude restricted cash, primarily held in certificates of deposit, of $0.1 million and $0.3 million as of December 31, 2014 and December 31, 2013, respectively, which is classified in prepaids and other current assets on the consolidated balance sheet.

Income_loss_per_share_Tables

Income (loss) per share (Tables)	12 Months Ended
	Dec. 31, 2014
Earnings Per Share [Abstract]
Schedule of the computation of basic and diluted net income (loss) per share	The following table presents the calculation of basic and diluted net income (loss) per share:
		Years ended December 31,
	(in thousands, except for share and per share amounts)	2014				2013			2012
	Numerator:
	Net (loss) income	$	(28,297	)		$	(10,465	)	$	2,893
	Less: undistributed earnings attributable to participating securities	—				—			(1,366		)
	Net (loss) income attributable to common stockholders	$	(28,297	)		$	(10,465	)	$	1,527
	Reallocation of undistributed earnings attributable to participating securities	—				—			32
	Net (loss) income attributable to common stockholders for diluted net (loss) income per share	$	(28,297	)		$	(10,465	)	$	1,559
	Denominator:
	Weighted-average shares used to compute basic net income (loss) per common share	25,329				24,621			17,979
	Effect of potentially dilutive securities:
	Employee stock options and restricted stock units	—				—			2,547
	Stock warrants	—				—			82
	Weighted average shares used to compute diluted income (loss) per common share	25,329				24,621			20,608
	Net (loss) income per share
	Net (loss) income per common share - basic and diluted	($1.12)				($0.43)			$0.08
Schedule of antidilutive securities excluded from computation of earnings per share	For the years ended December 31, 2014, 2013 and 2012, the following securities were not included in the calculation of diluted shares outstanding as the effect would have been anti-dilutive:
		As of December 31,
	(in thousands)	2014			2013			2012
	Options to purchase common stock	3,573			3,335			367
	Common stock subject to repurchase	5			25			—
	Warrants to purchase common stock	44			44			—
	Restricted stock units	981			623			25
	Restricted stock awards	—			12			—

Goodwill_and_intangible_assets1

Goodwill and intangible assets (Tables)	12 Months Ended
	Dec. 31, 2014
Goodwill and Intangible Assets Disclosure [Abstract]
Schedule of Finite-Lived Intangible Assets	Intangible assets
	The fair values for acquired intangible assets were determined by management with consideration of, in part, valuations performed by independent valuation specialists. Acquisition-related intangible assets are amortized over the life of the assets on an accelerated basis that approximates the expected economic benefit of the assets. This assumption results in amortization that is higher in earlier periods of the useful life. To date there has been no impairment of the Company's intangible assets. The estimated useful lives and carrying value of acquired intangible assets are as follows:
				December 31, 2014						December 31, 2013
	(in thousands)	Weighted average		Gross		Accumulated		Net		Gross		Accumulated		Net
		useful life		carrying		amortization		carrying		carrying		amortization		carrying
		(years)		amount				amount		amount				amount
	Intangible assets:
	Customer relationships	7 to 9		$	2,520	$	1,722	$	798	$	2,350	$	1,449	$	901
	Developed technology	4 to 7		$	2,710	$	1,693	$	1,017	$	1,880	$	1,264	$	616
	Trademarks	4 to 7		$	110	$	63	$	47	$	70	$	43	$	27
	Non-compete Agreements	2 to 4		460		91		369		70		70		—
	Intangible assets - finite life			$	5,800	$	3,569	$	2,231	$	4,370	$	2,826	$	1,544
	In-process R&D	n/a		$	940	$	—	$	940	$	—	$	—	$	—
	Intangible assets, net book value			$	6,740	$	3,569	$	3,171	$	4,370	$	2,826	$	1,544
	Amortization of intangible assets was $0.8 million, $0.7 million and $0.9 million for the years ended December 31, 2014, 2013 and 2012, respectively.
Schedule of Finite-Lived Intangible Assets, Future Amortization Expense	Amortization of acquired intangible assets is reflected in the cost of revenues for developed technology and in operating expenses for the other intangibles. The estimated future amortization of acquired intangible assets as of December 31, 2014 was as follows:
	(in thousands)	Future amortization
	2015	727
	2016	562
	2017	394
	2018	275
	2019	229
	Thereafter	44
	Future amortization expense	$	2,231

Balance_Sheet_Components_Table

Balance Sheet Components (Tables)	12 Months Ended
	Dec. 31, 2014
Balance Sheet Components [Abstract]
Inventories	Inventories
			December 31,
	(in thousands)		2014				2013
	Raw materials		$	759			$	806
	Finished goods		2,703				4,859
	Total inventories		$	3,462			$	5,665
Property and Equipment	Property and equipment, net
			December 31,
	(in thousands)		2014				2013
	Computer equipment and software		$	8,772			$	7,345
	Furniture, fixtures and equipment		962				924
	Leasehold improvements		2,298				2,125
	Manufacturing tools and equipment		3,795				3,081
	Construction in process		122				555
	Property and equipment, at cost		15,949				14,030
	Less: Accumulated depreciation		(10,827		)		(8,665		)
	Property and equipment, net		$	5,122			$	5,365
	Depreciation and amortization expense for property and equipment for the years ended December 31, 2014, 2013 and 2012 was $2.2 million, $1.8 million and $1.7 million, respectively.
Investment in sales-type leases	Net investment in sales-type leases
	The Company has sales-type leases with terms of 1.25 to 4 years. Sales-type lease receivables are collateralized by the underlying equipment. The components of our net investment in sales-type leases are as follows:
		December 31,
	(in thousands)	2014				2013
	Net minimum lease payments to be received	$	1,882			$	2,597
	Less: Unearned interest income and executory revenue portion	(962		)		(1,167		)
	Net investment in sales-type leases	920				1,430
	Less: Current portion	(564		)		(620		)
	Non-current net investment in sales-type leases	$	356			$	810
	There were no allowances for doubtful accounts on these leases as of December 31, 2014 and 2013. There is no guaranteed or unguaranteed residual value on the leased equipment. The current and non-current net investments in sales-types leases are reported as components of the consolidated balance sheet captions "other receivables" and "other long-term assets", respectively.
Future Minimum Lease Payments for sales-type Leases	The minimum lease payments expected for future years under sales-type leases as of December 31, 2014 were as follows:
	(in thousands)	Future lease payments
	2015	$	877
	2016	705
	2017	291
	2018	9
	Thereafter	—
	Total	$	1,882
Accrued Liabilities	Accrued payroll, restructuring and other current liabilities
			December 31,
	(in thousands)		2014				2013
	Payroll and related expenses		$	7,009			$	5,065
	Accrued payables		1,715				2,259
	Deferred rent, current portion		299				490
	Lease financing, current portion		645				528
	Product warranty		497				840
	Customer prepayments		283				281
	Sales and use tax payable		293				259
	Other		122				119
	Total accrued payroll and other current liabilities		$	10,863			$	9,841
	Included in payroll and related expenses above is $0.2 million of accrued severance-related restructuring charges that will be paid by March 31, 2015. During the fourth quarter of 2014, the Company initiated a restructuring plan which resulted in $0.7 million of severance charges, of which $0.1 million was recorded to cost of revenue and $0.6 million was recorded to operating expenses.
Product Warranty Disclosure	The Company provides for the estimated costs of hardware warranties at the time the related revenue is recognized. Costs are estimated based on historical and projected product failure rates, historical and projected repair costs, and knowledge of specific product failures (if any). The specific hardware warranty includes parts and labor over a period generally ranging from one to three years. The Company provides no warranty for software. The Company regularly re-evaluates its estimates to assess the adequacy of the recorded warranty liabilities and adjust the amounts as necessary.
	A reconciliation of the changes in the Company’s warranty reserve for the years ended December 31, 2014, 2013 and 2012 is as follows:
			Years ended December 31,
	(in thousands)		2014				2013			2012
	Warranty balance at the beginning of the period		$	840			$	297		$	983
	Warranty expense accrued for shipments during the period		723				1,185			540
	Changes in estimate related to pre-existing warranties		(68		)		536			(242		)
	Warranty settlements made		(998		)		(1,178		)	(984		)
	Warranty balance at the end of the period		$	497			$	840		$	297
Schedule of Product Warranty Liability	A reconciliation of the changes in the Company’s warranty reserve for the years ended December 31, 2014, 2013 and 2012 is as follows:
			Years ended December 31,
	(in thousands)		2014				2013			2012
	Warranty balance at the beginning of the period		$	840			$	297		$	983
	Warranty expense accrued for shipments during the period		723				1,185			540
	Changes in estimate related to pre-existing warranties		(68		)		536			(242		)
	Warranty settlements made		(998		)		(1,178		)	(984		)
	Warranty balance at the end of the period		$	497			$	840		$	297

Commitments_Tables

Commitments (Tables)	12 Months Ended
	Dec. 31, 2014
Commitments and Contingencies Disclosure [Abstract]
Schedule of Future Minimum Rental Payments for Operating Leases	Future minimum lease payments at December 31, 2014 under non-cancelable operating leases are as follows:
	(in thousands)	Operating
		leases
	2015	1,764
	2016	610
	2017	107
	Total minimum lease payments	$	2,481

Common_stock_Tables

Common stock (Tables)	12 Months Ended
	Dec. 31, 2014
Disclosure of Compensation Related Costs, Share-based Payments [Abstract]
Schedule of Reserved Shares for Issuance	At December 31, 2014, the Company has reserved shares for issuance of common stock as follows:
		Common Shares
	Reserved under stock option plans	622,343
	Warrants to purchase common stock	44,491
	Total reserved for issuance	666,834
Schedule of Stock Option Activity	The following table summarizes the combined stock option activity under the 2000 Plan, the 2006 Plan and the 2012 Plan and non-plan stock option agreements:
			Options outstanding
			Number			Weighted			Weighted		Aggregate
			of options			average			average		intrinsic
						exercise			remaining		value
						price			contractual term
									(in years)		(in thousands)
	Outstanding at December 31, 2013		3,287,207			$	9.62		6.45		$	24,880
	Options granted		1,055,949			11.54
	Options exercised		(293,615	)		3.73
	Options canceled		(630,917	)		14.59
	Outstanding at December 31, 2014		3,418,624			$	9.8		6.24		$	12,167
	Options vested and expected to vest as of December 31, 2014		3,318,085			$	9.72		6.15		$	12,100
	Options vested and exercisable as of December 31, 2014		2,076,366			$	7.35		4.49		$	11,346
Options, Grants in Period, Wtd Avg Grant Date Fair Value	Using the Black-Scholes option-pricing model, the weighted-average grant-date fair value of options granted to employees during the years ended December 31, 2014, 2013 and 2012 was $4.77 per share, $7.34 per share and $10.19 per share, respectively. Further information regarding the value of employee options vested and exercised during the years ended December 31, 2014, 2013 and 2012 is set forth below.
			Years ended December 31,
	(in thousands)		2014				2013			2012
	Intrinsic value of options exercised during period		$	2,997			$	5,896		$	24,846
Schedule of Valuation Assumptions for Stock Options	The Company uses the Black-Scholes option-pricing model to calculate the fair value of stock options on their grant date. This model requires the following major inputs: the estimated fair value of the underlying common stock, the expected term of the option, the expected volatility of the underlying common stock over the expected life of the option, the risk-free interest rate and expected dividend yield. The following assumptions were used for each respective period for employee stock-based compensation:
			Years ended December 31,
			2014		2013		2012
	Expected Term (in years)		5.41 - 5.45		5.38 - 5.43		5.23 - 5.60
	Volatility		41.4% - 48.2%		46.7% - 48.1%		47.9% - 48.7%
	Risk-free interest rate		1.59% - 1.78%		0.81% - 1.80%		0.72% - 1.03%
	Dividend yield		0.00%		0.00%		0.00%
Schedule of Valuation Assumptions for ESPP	The Company uses the Black-Scholes option-pricing model to calculate the fair value of periodic ESPP offerings on their offer date. The following assumptions were used for each respective period for the ESPP:
			Years ended December 31,
			2014		2013		2012
	Expected Term (in years)		0.5		0.25 - 0.50		0.50 - 0.88
	Volatility		35.9% - 57.7%		33.3% - 36.0%		43.2% - 50.0%
	Risk-free interest rate		0.05% - 0.10%		0.05% - 0.13%		0.14% - 0.18%
	Dividend yield		0.00%		0.00%		0.00%
Summary of the restricted stock activty	A summary of the restricted stock activity for the year ended December 31, 2014 is presented below:
			Restricted Stock Awards						Restricted Stock Units
			Number of shares			Weighted Average Grant Date Fair Value per Share			Number of shares			Weighted Average Grant Date Fair Value per Share
	Outstanding at December 31, 2013		12,076			$	12.42		755,271			$	19.24
	Granted		—			—			823,554			11.64
	Vested		(12,076	)		12.42			(327,562	)		19.11
	Forfeited		—			—			(188,673	)		16.97
	Outstanding at December 31, 2014		—			$	—		1,062,590			$	13.79
Schedule of Share-based Comp Allocation of Period Costs	The following table presents the stock-based compensation allocation of expense (both for employees and non-employees):
			Years ended December 31,
	(in thousands)		2014				2013			2012
	Cost of revenue		$	1,178			$	967		$	421
	Research and development		1,056				861			449
	Sales and marketing		4,111				2,942			1,262
	General and administrative		4,739				3,897			2,100
	Total stock-based compensation		$	11,084			$	8,667		$	4,232

Segments_Tables

Segments (Tables)	12 Months Ended
	Dec. 31, 2014
Segment Reporting [Abstract]
Summary of the operating segments	The following table presents a summary of the operating segments:
		Years ended December 31,
	(in thousands)	2014			2013			2012
	Revenue
	Product	$	51,095		$	62,393		$	65,028
	Service	44,326			40,105			35,929
	Total revenue	95,421			102,498			100,957
	Cost of revenue
	Product	18,766			21,714			21,551
	Service	18,470			16,595			15,070
	Total cost of revenue	37,236			38,309			36,621
	Gross profit
	Product	32,329			40,679			43,477
	Service	25,856			23,510			20,859
	Total gross profit	58,185			64,189			64,336
	Operating expenses	86,264			74,749			59,440
	Interest income (expense), net and other	106			204			(1,376		)
	(Loss) income before income taxes	$	(27,973	)	$	(10,356	)	$	3,520
Summary of revenue by product line	The following tables present the Company’s revenue by product line, as well as revenue and long-lived assets by geographic region.
		Years ended December 31,
	(in thousands)	2014			2013			2012
	Revenue
	Product
	Device	$	37,455		$	46,636		$	47,725
	Software	13,640			15,757			17,303
	Total product	51,095			62,393			65,028
	Service
	Maintenance and support	35,353			31,559			26,237
	Professional services and training	8,973			8,546			9,692
	Total service	44,326			40,105			35,929
	Total revenue	$	95,421		$	102,498		$	100,957
Schedule of revenue by geographic region	The Company’s revenue by geographic region, based on customer location, is summarized as follows:
		Years ended December 31,
	(in thousands)	2014			2013			2012
	Revenue
	United States	$	86,007		$	91,763		$	90,108
	International	9,414			10,735			10,849
	Total revenue	$	95,421		$	102,498		$	100,957
Schedule of Geographic Disclosure of Long-Lived Assets	The Company’s tangible long-lived assets by geographic region, consisting of net property and equipment, are summarized as follows:
		December 31,
	(in thousands)	2014			2013			2012
	Property and equipment, net
	United States	$	4,852		$	5,249		$	3,465
	International	270			116			166
	Total property and equipment, net	$	5,122		$	5,365		$	3,631

Income_Taxes_Tables

Income Taxes (Tables)	12 Months Ended
	Dec. 31, 2014
Income Tax Disclosure [Abstract]
Components of income (loss) before income tax	The components of (loss) income before income taxes are as follows:
		Years ended December 31,
	(in thousands)	2014			2013			2012
	United States	$	(28,442	)	$	(10,812	)	$	3,205
	International	469			456			315
	Total (loss) income before income taxes	$	(27,973	)	$	(10,356	)	$	3,520
Components of the provision (benefit) for income taxes	The components of the provision for income taxes are as follows:
		Years ended December 31,
	(in thousands)	2014			2013			2012
	Current
	Federal	$	—		$	—		$	7
	State	14			(40		)	512
	Foreign	204			74			38
		218			34			557
	Deferred
	Federal	134			60			60
	State	(4		)	4			10
	Foreign	(24		)	11			—
		106			75			70
	Total income tax provision	$	324		$	109		$	627
Reconciliation of the provision for income taxes at the statutory rate	Reconciliation of the provision for income taxes at the statutory rate to the Company’s provision for income tax is as follows:
		Years ended December 31,
	(in thousands)	2014			2013			2012
	U.S. federal (tax benefit) provision at statutory rate	$	(9,511	)	$	(3,567	)	$	1,197
	State (tax benefit) income taxes, net of federal benefit	(895		)	(338		)	151
	Foreign income taxes at rates other than the US rate	43			(28		)	(10		)
	Stock-based compensation	763			549			397
	Change in valuation allowance	10,203			3,911			(1,494		)
	Non-deductible warrant expense	—			—			625
	Research and development credits	(466		)	(527		)	(220		)
	Other	187			109			(19		)
	Total	$	324		$	109		$	627
Deferred tax assets and liabilities	Deferred income taxes reflect the net tax effects of temporary differences between the carrying amounts of assets and liabilities for financial reporting purposes and the amounts used for income tax purposes. The following table presents the significant components of the Company’s deferred tax assets and liabilities for the periods presented:
		As of December 31,
	(in thousands)	2014			2013
	Deferred tax assets
	Net operating loss carryforward	$	19,190		$	11,873
	Research and development credits	3,360			2,809
	Depreciation and amortization	650			288
	Reserves and accruals	6,900			6,060
	Total deferred tax assets	30,100			21,030
	Valuation allowance	(30,072		)	(21,030		)
	Net deferred tax assets	28			—
	Deferred tax liabilities	(352		)	(216		)
	Net deferred tax liabilities	$	(324	)	$	(216	)
Valuation allowance for DTA rollforward [Table Text Block]	The following table displays by contributing factor the changes in the valuation allowance for deferred tax assets since January 1, 2012:
		Years Ended December 31,
	(in thousands)	2014			2013			2012
	Balance at the beginning of the period	$	21,030		$	21,193		$	22,687
	Net operating loss carryforwards generated (utilization)	7,317			(2,397		)	(3,505		)
	R&D tax credit increase	551			172			272
	Depreciation and amortization increase	362			204			29
	Reserves and accruals increase	840			1,558			1,273
	Deferred tax assets decrease (increase)	(28		)	300			437
	Balance at the end of the period	$	30,072		$	21,030		$	21,193
Changes in the unrecognized tax benefits	The following table reflects changes in the unrecognized tax benefits since January 1, 2013:
		Years ended December 31,
	(in thousands)	2014			2013
	Gross amount of unrecognized tax benefits as of the beginning of the period	$	1,092		$	1,079
	Increases related to prior year tax provisions	25			30
	Decreases related to prior year tax provisions	—			(239		)
	Increases related to current year tax provisions	148			222
	Gross amount of unrecognized tax benefits as of the end of the period	$	1,265		$	1,092

Business_Acquisitions_Tables

Business Acquisitions (Tables)	12 Months Ended
	Dec. 31, 2014
Net assets of mVisum, Inc. [Member]
Business Acquisition [Line Items]
Schedule of Recognized Identified Assets Acquired and Liabilities Assumed [Table Text Block]	The following table presents the fair value of the identifiable assets acquired and liabilities assumed as of the acquisition date:
	(in thousands)	Fair value of net assets acquired
	Accounts receivable	$	187
	Intangibles
	Developed technology		830
	Non-compete agreement		260
	Customer relationships		170
	Trademarks and trade names		40
	Goodwill		2,103
	Total assets		3,590
	Deferred revenue		(90	)
	Net assets acquired	$	3,500
Prana Technologies [Member]
Business Acquisition [Line Items]
Schedule of Recognized Identified Assets Acquired and Liabilities Assumed [Table Text Block]	The following table presents the fair value of the identifiable assets acquired and liabilities assumed as of the acquisition date:
	(in thousands)	Fair value of net assets acquired
	Intangibles
	Non-compete agreement	200
	In-process research and development	940
	Goodwill	2,310
	Total assets acquired	3,450

Quarterly_results_of_operation1

Quarterly results of operations (unaudited) (Tables)	12 Months Ended
	Dec. 31, 2014
Quarterly Financial Information Disclosure [Abstract]
Schedule of Quarterly Financial Information [Table Text Block]	12. Quarterly results of operations (unaudited)
	The following tables present certain unaudited consolidated quarterly financial information for each of the eight quarters ended December 31, 2014. This quarterly information has been prepared on the same basis as the consolidated financial statements and includes all adjustments necessary to state fairly the information for the periods presented.
	(In thousands, except per share data)	Quarter Ended
	2014	March 31,			June 30,			September 30,			December 31,
	Total revenue	$	24,676		$	23,019		$	23,124		$	24,602
	Gross profit	$	14,872		$	14,070		$	13,535		$	15,708
	Net loss	$	(6,389	)	$	(7,008	)	$	(7,891	)	$	(7,009	)
	Net loss attributable to common stockholders	$	(6,389	)	$	(7,008	)	$	(7,891	)	$	(7,009	)
	Net loss per share attributable to common stockholders:
	Basic and diluted	$	(0.26	)	$	(0.28	)	$	(0.31	)	$	(0.27	)
	Weighted average shares used to compute net income (loss) per share attributable to common stockholders:
	Basic and diluted	25,047			25,246			25,432			25,572
		Quarter Ended
	2013	March 31,			June 30,			September 30,			December 31,
	Total revenue	$	22,413		$	25,296		$	26,067		$	28,722
	Gross profit	$	13,719		$	15,790		$	16,277		$	18,403
	Net loss	$	(3,499	)	$	(2,022	)	$	(3,102	)	$	(1,842	)
	Net loss attributable to common stockholders	$	(3,499	)	$	(2,022	)	$	(3,102	)	$	(1,842	)
	Net loss per share attributable to common stockholders:
	Basic and diluted	$	(0.14	)	$	(0.08	)	$	(0.13	)	$	(0.07	)
	Weighted average shares used to compute net loss per common share:
	Basic and diluted	24,282			24,555			24,747			24,893
	The following tables present certain unaudited consolidated quarterly financial information for each of the eight quarters ended December 31, 2014. This quarterly information has been prepared on the same basis as the consolidated financial statements and includes all adjustments necessary to state fairly the information for the periods presented.
	(In thousands, except per share data)	Quarter Ended
	2014	March 31,			June 30,			September 30,			December 31,
	Total revenue	$	24,676		$	23,019		$	23,124		$	24,602
	Gross profit	$	14,872		$	14,070		$	13,535		$	15,708
	Net loss	$	(6,389	)	$	(7,008	)	$	(7,891	)	$	(7,009	)
	Net loss attributable to common stockholders	$	(6,389	)	$	(7,008	)	$	(7,891	)	$	(7,009	)
	Net loss per share attributable to common stockholders:
	Basic and diluted	$	(0.26	)	$	(0.28	)	$	(0.31	)	$	(0.27	)
	Weighted average shares used to compute net income (loss) per share attributable to common stockholders:
	Basic and diluted	25,047			25,246			25,432			25,572
		Quarter Ended
	2013	March 31,			June 30,			September 30,			December 31,
	Total revenue	$	22,413		$	25,296		$	26,067		$	28,722
	Gross profit	$	13,719		$	15,790		$	16,277		$	18,403
	Net loss	$	(3,499	)	$	(2,022	)	$	(3,102	)	$	(1,842	)
	Net loss attributable to common stockholders	$	(3,499	)	$	(2,022	)	$	(3,102	)	$	(1,842	)
	Net loss per share attributable to common stockholders:
	Basic and diluted	$	(0.14	)	$	(0.08	)	$	(0.13	)	$	(0.07	)
	Weighted average shares used to compute net loss per common share:
	Basic and diluted	24,282			24,555			24,747			24,893

The_Company_and_Summary_of_Sig3

The Company and Summary of Significant Accounting Policies Narrative (Details) (USD $)	12 Months Ended
	Dec. 31, 2014	Dec. 31, 2013	Dec. 31, 2012	Dec. 31, 2011
Sale of Stock [Line Items]
No. of healthcare and non healthcare installations worldwide	1,300
Document Period End Date	31-Dec-14
Maintenance services revenue recognition period	1 year
Accumulated deficit	($92,730,000)	($64,433,000)
Cash, Cash Equivalents, and Short-term Investments	116,300,000
Restricted cash	100,000	300,000
Capitalized Computer Software, Additions	200,000	2,100,000	1,100,000
No. of revenue customers with 10% or greater concentration	0	0	0
No of Acct Rec customers with 10% or greater concentration	0	0
Impairment of Intangibles (Excl. Goodwill)	0	0	0
Goodwill, Impairment Loss	0	0	0
No of operating segments	2
Deferred Tax Assets, Valuation Allowance	30,072,000	21,030,000	21,193,000	22,687,000
Maximum
Sale of Stock [Line Items]
Professional service revenue recognition period	P12W
Product Liability, Warranty Period	3 years
Minimum
Sale of Stock [Line Items]
Professional service revenue recognition period	P2W
Product Liability, Warranty Period	1 year
Restricted stock units
Sale of Stock [Line Items]
Vesting percentage on 1st anniversary of grant (percent)	33.33%
Vesting percentage on 2nd anniversary of grant (percent)	33.33%
Vesting percentage on 3rd anniversary of grant (percent)	33.34%
Director | Restricted Stock [Member]
Sale of Stock [Line Items]
Vesting percentage on 1st anniversary of grant (percent)	50.00%
Vesting percentage on 2nd anniversary of grant (percent)	50.00%
Sharon O'Keefe [Member] | Service | University of Chicago Medical Center [Member]
Sale of Stock [Line Items]
Related Party Transaction, Amounts of Transaction	300,000	500,000	500,000
John N. McMullen [Member] | Service | Hewlett-Packard Company [Member]
Sale of Stock [Line Items]
Related Party Transaction, Amounts of Transaction	$0	$9,200	$0
Property and Equipment, excluding LHI and major ERP [Member]
Sale of Stock [Line Items]
Property, Plant and Equipment, Useful Life	3 years
Not major ERP implementation [Member] | Software and Software Development Costs [Member]
Sale of Stock [Line Items]
Property, Plant and Equipment, Useful Life	3 years
Major ERP implementation [Member] | Software and Software Development Costs [Member]
Sale of Stock [Line Items]
Property, Plant and Equipment, Useful Life	5 years

The_Company_and_Summary_of_Sig4

The Company and Summary of Significant Accounting Policies Sales type lease data (Details) (USD $)	12 Months Ended
	Dec. 31, 2014	Dec. 31, 2013
Accounting Policies [Abstract]
sales type capital leases transfered to banks	$1,400,000	$2,200,000
financing liability for future executory services on transfered leases	600,000	800,000
Capital Leases, Net Investment in Sales Type Leases	$920,000	$1,430,000

The_Company_and_Summary_of_Sig5

The Company and Summary of Significant Accounting Policies Allowance for Doubtful Accounts (Details) (USD $)	12 Months Ended
In Thousands, unless otherwise specified	Dec. 31, 2014	Dec. 31, 2013	Dec. 31, 2012
Changes in Allowance for Doubtful Accounts [Roll Forward]
Allowance—beginning of period	($6)	$0	$0
Provisions for bad debts	-53	-29	0
Allowance for Loan and Lease Loss, Recovery of Bad Debts	4	13	0
Write-offs and other	2	10	0
Allowance—end of period	($53)	($6)	$0

The_Company_and_Summary_of_Sig6

The Company and Summary of Significant Accounting Policies The Company and significant accounting policies - Convertible preferred stock (Details) (USD $)	12 Months Ended
In Thousands, unless otherwise specified	Dec. 31, 2012
Conversion of Stock, Amount Converted	($53,356)

The_Company_and_Summary_of_Sig7

The Company and Summary of Significant Accounting Policies Background (Details)	12 Months Ended
	Dec. 31, 2014
Organization, Consolidation and Presentation of Financial Statements [Abstract]
No. of healthcare and non healthcare installations worldwide	1,300

Fair_value_of_financial_instru2

Fair value of financial instruments Schedule of assets and liabilities measured at fair value on a recurring basis, by level (Details) (USD $)	Dec. 31, 2014	Dec. 31, 2013
In Thousands, unless otherwise specified
Assets, Fair Value Disclosure [Abstract]
Cash and Cash Equivalents, Fair Value Disclosure	$22,615	$39,652
Available-for-sale Securities	93,646	88,024
Fair Value, Measurements, Recurring | Level 1
Assets, Fair Value Disclosure [Abstract]
Total assets measured at fair value	7,795	22,991
Fair Value, Measurements, Recurring | Level 2
Assets, Fair Value Disclosure [Abstract]
Total assets measured at fair value	99,664	89,234
Fair Value, Measurements, Recurring | Total
Assets, Fair Value Disclosure [Abstract]
Total assets measured at fair value	107,459	112,225
Fair Value, Measurements, Recurring | Money Market Funds [Member] | Level 1
Assets, Fair Value Disclosure [Abstract]
Cash and Cash Equivalents, Fair Value Disclosure	7,795	22,991
Fair Value, Measurements, Recurring | Money Market Funds [Member] | Level 2
Assets, Fair Value Disclosure [Abstract]
Cash and Cash Equivalents, Fair Value Disclosure	0	0
Fair Value, Measurements, Recurring | Money Market Funds [Member] | Total
Assets, Fair Value Disclosure [Abstract]
Cash and Cash Equivalents, Fair Value Disclosure	7,795	22,991
Fair Value, Measurements, Recurring | Commercial paper | Level 1
Assets, Fair Value Disclosure [Abstract]
Available-for-sale Securities	0	0
Fair Value, Measurements, Recurring | Commercial paper | Level 2
Assets, Fair Value Disclosure [Abstract]
Available-for-sale Securities	3,225	900
Fair Value, Measurements, Recurring | Commercial paper | Total
Assets, Fair Value Disclosure [Abstract]
Available-for-sale Securities	3,225	900
Fair Value, Measurements, Recurring | U.S. government agency securities | Level 1
Assets, Fair Value Disclosure [Abstract]
Available-for-sale Securities	0	0
Fair Value, Measurements, Recurring | U.S. government agency securities | Level 2
Assets, Fair Value Disclosure [Abstract]
Available-for-sale Securities	5,955	11,279
Fair Value, Measurements, Recurring | U.S. government agency securities | Total
Assets, Fair Value Disclosure [Abstract]
Available-for-sale Securities	5,955	11,279
Fair Value, Measurements, Recurring | US Treasury Securities [Member] | Level 1
Assets, Fair Value Disclosure [Abstract]
Available-for-sale Securities	0	0
Fair Value, Measurements, Recurring | US Treasury Securities [Member] | Level 2
Assets, Fair Value Disclosure [Abstract]
Available-for-sale Securities	4,043	5,235
Fair Value, Measurements, Recurring | US Treasury Securities [Member] | Total
Assets, Fair Value Disclosure [Abstract]
Available-for-sale Securities	4,043	5,235
Fair Value, Measurements, Recurring | US States and Political Subdivisions Debt Securities [Member] | Level 1
Assets, Fair Value Disclosure [Abstract]
Available-for-sale Securities	0	0
Fair Value, Measurements, Recurring | US States and Political Subdivisions Debt Securities [Member] | Level 2
Assets, Fair Value Disclosure [Abstract]
Available-for-sale Securities	3,924	4,765
Fair Value, Measurements, Recurring | US States and Political Subdivisions Debt Securities [Member] | Total
Assets, Fair Value Disclosure [Abstract]
Available-for-sale Securities	3,924	4,765
Fair Value, Measurements, Recurring | Corporate Debt Securities [Member] | Level 1
Assets, Fair Value Disclosure [Abstract]
Available-for-sale Securities	0	0
Fair Value, Measurements, Recurring | Corporate Debt Securities [Member] | Level 2
Assets, Fair Value Disclosure [Abstract]
Available-for-sale Securities	82,517	67,055
Fair Value, Measurements, Recurring | Corporate Debt Securities [Member] | Total
Assets, Fair Value Disclosure [Abstract]
Available-for-sale Securities	$82,517	$67,055

Cash_Cash_Equivalents_and_Shor2

Cash, Cash Equivalents and Short-term Investments (Details) (USD $)	Dec. 31, 2014	Dec. 31, 2013
In Thousands, unless otherwise specified
Cash and cash equivalents:
Amortized Cost	$22,615	$39,652
Unrealized Gains	0	0
Unrealized Losses	0	0
Fair value	22,615	39,652
Short-Term Investments:
Amortized Cost	93,724	87,998
Unrealized Gains	9	34
Unrealized Losses	-87	-8
Fair value	93,646	88,024
Cash, Cash Equivalents, and Short-term Investments [Abstract]
Amortized Cost	116,339	127,650
Unrealized Gains	9	34
Unrealized Losses	-87	-8
Fair value	116,261	127,676
Commercial paper
Short-Term Investments:
Amortized Cost	1,860	750
Unrealized Gains	0	0
Unrealized Losses	0	0
Fair value	1,860	750
U.S. government agency securities
Short-Term Investments:
Amortized Cost	5,856	11,275
Unrealized Gains	1	5
Unrealized Losses	-2	-1
Fair value	5,855	11,279
US Treasury Securities [Member]
Short-Term Investments:
Amortized Cost	4,042	5,233
Unrealized Gains	1	2
Unrealized Losses	0	0
Fair value	4,043	5,235
US States and Political Subdivisions Debt Securities [Member]
Short-Term Investments:
Amortized Cost	3,922	4,758
Unrealized Gains	2	7
Unrealized Losses	0	0
Fair value	3,924	4,765
Corporate Debt Securities [Member]
Short-Term Investments:
Amortized Cost	78,044	65,982
Unrealized Gains	5	20
Unrealized Losses	-85	-7
Fair value	77,964	65,995
Demand deposis and other cash
Cash and cash equivalents:
Amortized Cost	8,802	15,451
Unrealized Gains	0	0
Unrealized Losses	0	0
Fair value	8,802	15,451
Money Market Funds [Member]
Cash and cash equivalents:
Amortized Cost	7,795	22,991
Unrealized Gains	0	0
Unrealized Losses	0	0
Fair value	7,795	22,991
Commercial paper
Cash and cash equivalents:
Amortized Cost	1,365	150
Unrealized Gains	0	0
Unrealized Losses	0	0
Fair value	1,365	150
Corporate Debt Securities [Member]
Cash and cash equivalents:
Amortized Cost	4,553	1,060
Unrealized Gains	0	0
Unrealized Losses	0	0
Fair value	4,553	1,060
U.S. government agency securities
Cash and cash equivalents:
Amortized Cost	100
Unrealized Gains	0
Unrealized Losses	0
Fair value	$100

Cash_Cash_Equivalents_and_Shor3

Cash, Cash Equivalents and Short-term Investments Classification by contractual maturity of cash, cash equivalents and short-term investments (Details) (USD $)	Dec. 31, 2014	Dec. 31, 2013
In Thousands, unless otherwise specified
Schedule of Available-for-sale Securities [Line Items]
Restricted Cash and Cash Equivalents, Current	$100	$300
Cash and Cash Equivalents, Fair Value Disclosure	22,615	39,652
Available-for-sale Securities	93,646	88,024
Cash, Cash Equivalents And Short Term Investments, Fair Value Disclosure	116,261	127,676
Maturity up to one year [Member]
Schedule of Available-for-sale Securities [Line Items]
Cash and Cash Equivalents, Fair Value Disclosure	22,615	39,652
Available-for-sale Securities	76,917	71,464
Cash, Cash Equivalents And Short Term Investments, Fair Value Disclosure	99,532	111,116
maturity between 1 and 2 years [Member]
Schedule of Available-for-sale Securities [Line Items]
Cash and Cash Equivalents, Fair Value Disclosure	0	0
Available-for-sale Securities	16,729	16,560
Cash, Cash Equivalents And Short Term Investments, Fair Value Disclosure	$16,729	$16,560

Cash_Cash_Equivalents_and_Shor4

Cash, Cash Equivalents and Short-term Investments Restricted cash (Details) (USD $)	Dec. 31, 2014	Dec. 31, 2013
In Thousands, unless otherwise specified
Cash and Cash Equivalents - Restricted Cash [Abstract]
Restricted cash	$100	$300

Income_loss_per_share_Schedule

Income (loss) per share Schedule of the computation of basic and diluted net income (loss) per share (Details) (USD $)	3 Months Ended								12 Months Ended
In Thousands, except 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
Basic and diluted earnings per share
Annual dividend rate, conv. preferred stock											8.00%
participating securities	2,364				26,463				2,364	26,463
Numerator:
Net (loss) income	($7,009)	($7,891)	($7,008)	($6,389)	($1,842)	($3,102)	($2,022)	($3,499)	($28,297)	($10,465)	$2,893
Undistributed Earnings (Loss) Allocated to Participating Securities, Basic									0	0	-1,366
Net (loss) income attributable to common stockholders	-7,009	-7,891	-7,008	-6,389	-1,842	-3,102	-2,022	-3,499	-28,297	-10,465	1,527
Undistributed Earnings (Loss) Allocated to Participating Securities, Diluted									0	0	32
Net Income (Loss) Available to Common Stockholders, Diluted									($28,297)	($10,465)	$1,559
Denominator:
Weighted-average shares used to compute basic net income (loss) per common share									25,329,000	24,621,000	17,979,000
Employee stock options and restricted stock units									0	0	2,547,000
Stock warrants									0	0	82,000
Weighted average shares used to compute diluted income (loss) per common share									25,329,000	24,621,000	20,608,000
Net (loss) income per share
Basic and diluted	($0.27)	($0.31)	($0.28)	($0.26)	($0.07)	($0.13)	($0.08)	($0.14)	($1.12)	($0.43)	$0.08

Income_loss_per_share_Schedule1

Income (loss) per share Schedule of antidilutive securities excluded from computation of earnings per share (Details)	12 Months Ended
In Thousands, unless otherwise specified	Dec. 31, 2014	Dec. 31, 2013	Dec. 31, 2012
Options to purchase common stock
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items]
Antidilutive Securities Excluded from Computation of Earnings Per Share, Amount	3,573	3,335	367
Common stock subject to repurchase
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items]
Antidilutive Securities Excluded from Computation of Earnings Per Share, Amount	5	25	0
Warrants to purchase common stock
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items]
Antidilutive Securities Excluded from Computation of Earnings Per Share, Amount	44	44	0
Restricted stock units
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items]
Antidilutive Securities Excluded from Computation of Earnings Per Share, Amount	981	623	25
Restricted Stock Awards
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items]
Antidilutive Securities Excluded from Computation of Earnings Per Share, Amount	0	12	0

Goodwill_and_intangible_assets2

Goodwill and intangible assets Schedule of Finite-Lived Intangible Assets (Details) (USD $)	12 Months Ended
	Dec. 31, 2014	Dec. 31, 2013	Dec. 31, 2012
Finite-Lived Intangible Assets [Line Items]
Gross carrying amount	$5,800,000	$4,370,000
Accumulated amortization	3,569,000	2,826,000
Finite-Lived Intangible Assets, Net	2,231,000	1,544,000
Intangible Assets, Gross (Excluding Goodwill)	6,740,000	4,370,000
Intangible assets, net	3,171,000	1,544,000
Goodwill [Abstract]
Goodwill	9,988,000	5,575,000
Impairment and Amortization [Abstract]
Goodwill, Impairment Loss	0	0	0
Impairment of Intangibles (Excl. Goodwill)	0	0	0
Amortization expense	800,000	700,000	900,000
In Process Research and Development [Member]
Finite-Lived Intangible Assets [Line Items]
Indefinite-Lived Intangible Assets (Excluding Goodwill)	940,000	0
Customer relationships
Finite-Lived Intangible Assets [Line Items]
Gross carrying amount	2,520,000	2,350,000
Accumulated amortization	1,722,000	1,449,000
Finite-Lived Intangible Assets, Net	798,000	901,000
Technology-Based Intangible Assets [Member]
Finite-Lived Intangible Assets [Line Items]
Gross carrying amount	2,710,000	1,880,000
Accumulated amortization	1,693,000	1,264,000
Finite-Lived Intangible Assets, Net	1,017,000	616,000
Trademarks and Trade Names [Member]
Finite-Lived Intangible Assets [Line Items]
Gross carrying amount	110,000	70,000
Accumulated amortization	63,000	43,000
Finite-Lived Intangible Assets, Net	47,000	27,000
Non-compete Agreements
Finite-Lived Intangible Assets [Line Items]
Gross carrying amount	460,000	70,000
Accumulated amortization	91,000	70,000
Finite-Lived Intangible Assets, Net	369,000	0
Net assets of mVisum, Inc. [Member]
Finite-Lived Intangible Assets [Line Items]
Goodwill, Acquired During Period	$4,400,000
Minimum [Member] | Customer relationships
Finite-Lived Intangible Assets [Line Items]
Weighted average useful life (years)	7 years
Minimum [Member] | Technology-Based Intangible Assets [Member]
Finite-Lived Intangible Assets [Line Items]
Weighted average useful life (years)	4 years
Minimum [Member] | Trademarks and Trade Names [Member]
Finite-Lived Intangible Assets [Line Items]
Weighted average useful life (years)	4 years
Minimum [Member] | Non-compete Agreements
Finite-Lived Intangible Assets [Line Items]
Weighted average useful life (years)	2 years
Maximum [Member] | Customer relationships
Finite-Lived Intangible Assets [Line Items]
Weighted average useful life (years)	9 years
Maximum [Member] | Technology-Based Intangible Assets [Member]
Finite-Lived Intangible Assets [Line Items]
Weighted average useful life (years)	7 years
Maximum [Member] | Trademarks and Trade Names [Member]
Finite-Lived Intangible Assets [Line Items]
Weighted average useful life (years)	7 years
Maximum [Member] | Non-compete Agreements
Finite-Lived Intangible Assets [Line Items]
Weighted average useful life (years)	4 years

Goodwill_and_intangible_assets3

Goodwill and intangible assets Future amortization schedule (Details) (USD $)	Dec. 31, 2014	Dec. 31, 2013
In Thousands, unless otherwise specified
Goodwill and intangible assets [Abstract]
2014	$727
2015	562
2016	394
2017	275
2018	229
Thereafter	44
Finite-Lived Intangible Assets, Net	$2,231	$1,544

Balance_Sheet_Components_Inven

Balance Sheet Components Inventories (Details) (USD $)	Dec. 31, 2014	Dec. 31, 2013
In Thousands, unless otherwise specified
Inventory, Net [Abstract]
Raw materials	$759	$806
Finished goods	2,703	4,859
Total inventories	$3,462	$5,665

Balance_Sheet_Components_Prope

Balance Sheet Components Property and Equipment (Details) (USD $)	Dec. 31, 2014	Dec. 31, 2013	Dec. 31, 2012
In Thousands, unless otherwise specified
Property, Plant and Equipment [Line Items]
Property, Plant and equipment, gross	$15,949	$14,030
Less: Accumulated depreciation	-10,827	-8,665
Property and equipment, net	5,122	5,365	3,631
Computer equipment and software
Property, Plant and Equipment [Line Items]
Property, Plant and equipment, gross	8,772	7,345
Furniture, fixtures and equipment
Property, Plant and Equipment [Line Items]
Property, Plant and equipment, gross	962	924
Leasehold improvements
Property, Plant and Equipment [Line Items]
Property, Plant and equipment, gross	2,298	2,125
Manufacturing tools and equipment
Property, Plant and Equipment [Line Items]
Property, Plant and equipment, gross	3,795	3,081
Construction in process
Property, Plant and Equipment [Line Items]
Property, Plant and equipment, gross	$122	$555

Balance_Sheet_Components_Depre

Balance Sheet Components Depreciation, depletion, amortization (Details) (USD $)	12 Months Ended
In Millions, unless otherwise specified	Dec. 31, 2014	Dec. 31, 2013	Dec. 31, 2012
Property-Equipment Deepreciation and amortization [Abstract]
Depreciation and amortization	$2.20	$1.80	$1.70

Balance_Sheet_Components_Balan

Balance Sheet Components Balance sheet components - investment in sales type leases (Details) (USD $)	12 Months Ended
In Thousands, unless otherwise specified	Dec. 31, 2014	Dec. 31, 2013
Investment in Sales Type Leases
Capital Leases, Net Investment in Sales Type Leases, Minimum Payments to be Received	1,882	$2,597
Capital Leases, Net Investment in Sales Type Leases, Deferred Income	-962	-1,167
Capital Leases, Net Investment in Sales Type Leases	920	1,430
Capital Leases, Lessor Balance Sheet, Net Investment in Sales Type Leases, Current	-564	-620
Capital Leases, Lessor Balance Sheet, Net Investment in Sales Type Leases, Noncurrent	356	$810
Minimum
Lease Term [Abstract]
Lessor Leasing Arrangements, Operating Leases, Term of Contract	1 year 3 months
Maximum
Lease Term [Abstract]
Lessor Leasing Arrangements, Operating Leases, Term of Contract	4 years

Balance_Sheet_Components_Balan1

Balance Sheet Components Balance sheet components - sales type lease Future Payments (Details) (USD $)	Dec. 31, 2014	Dec. 31, 2013
In Thousands, unless otherwise specified
Lessors schedule of future minimum lease payments [Line Items]
Capital Leases, Future Minimum Payments Due, Next Twelve Months	$877
Capital Leases, Future Minimum Payments Due in Two Years	705
Capital Leases, Future Minimum Payments Due in Three Years	291
Capital Leases, Future Minimum Payments Due in Four Years	9
capital leases minimum payments after four years	0
Capital Leases, Net Investment in Sales Type Leases, Minimum Payments to be Received	$1,882	$2,597

Balance_Sheet_Components_Accru

Balance Sheet Components Accrued Liabilities (Details) (USD $)	12 Months Ended
In Thousands, unless otherwise specified	Dec. 31, 2014	Dec. 31, 2013	Dec. 31, 2012
Balance Sheet Components [Abstract]
Product Warranty Accrual, Payments	$998	$1,178	$984
Accrued Liabilities, Current [Abstract]
Payroll and related expenses	7,009	5,065
Accrued payables	1,715	2,259
Deferred rent, current portion	299	490
Lease financing, current portion	645	528
Product warranty	497	840
Customer Refund Liability, Current	283	281
Sales and use tax payable	293	259
Other	122	119
Total accrued payroll and other current liabilities	$10,863	$9,841

Balance_Sheet_Components_Balan2

Balance Sheet Components Balance sheet components Product Warranties (Details) (USD $)	12 Months Ended
In Thousands, unless otherwise specified	Dec. 31, 2014	Dec. 31, 2013	Dec. 31, 2012
movement in std product warranty liability [Roll Forward]
Warranty balance at the beginning of the period	$840	$297	$983
Warranty expense accrued for shipments during the period	723	1,185	540
Changes in estimate related to pre-existing warranties	-68	536	-242
Warranty settlements made	-998	-1,178	-984
Warranty balance at the end of the period	$497	$840	$297

Balance_Sheet_Components_Balan3

Balance Sheet Components Balance Sheet Components Accrued Restructuring (Details) (USD $)	12 Months Ended
	Dec. 31, 2014	Dec. 31, 2013	Dec. 31, 2012
Restructuring Cost and Reserve [Line Items]
Restructuring Reserve, Current	$200,000
Restructuring Charges	556,000	0	0
Restructuring Reserve, Period Increase (Decrease)	$700,000
Other Restructuring [Member]
Restructuring Cost and Reserve [Line Items]
Restructuring and Related Cost, Caption that Includes Restructuring Charges	100000
Restructuring Charges [Member]
Restructuring Cost and Reserve [Line Items]
Restructuring and Related Cost, Caption that Includes Restructuring Charges	556000

Commitments_Schedule_of_Future

Commitments Schedule of Future Minimum Rental Payments for Operating Leases (Details) (USD $)	12 Months Ended
	Dec. 31, 2014	Dec. 31, 2013	Dec. 31, 2012
Operating Leases, Rent Expense, Net [Abstract]
Rent expense	$2,000,000	$2,000,000	$1,900,000
Operating Leases, Future Minimum Payments Due, Fiscal Year Maturity [Abstract]
2015	1,764,000
2016	610,000
2017	107,000
Total minimum lease payments	2,481,000
Inventories
Unrecorded Unconditional Purchase Obligation [Line Items]
Non-cancelable purchase commitment with a third party manufacturer to purchase inventory	$1,900,000	$3,100,000

Common_stock_Details

Common stock (Details) (USD $)	Dec. 31, 2014	Dec. 31, 2013
Disclosure of Compensation Related Costs, Share-based Payments [Abstract]
Common stock, shares authorized	100,000,000	100,000,000
Common stock, par value	$0.00	$0.00

Common_stock_Reserved_shares_f

Common stock (Reserved shares for issuance of common stock) (Details)	Dec. 31, 2014
Class of Stock [Line Items]
Common stock (in shares)	666,834
Options to purchase common stock
Class of Stock [Line Items]
Common stock (in shares)	622,343
Stock warrants
Class of Stock [Line Items]
Common stock (in shares)	44,491

Common_stock_Incentive_stock_o

Common stock (Incentive stock option plans) (Details)	12 Months Ended
	Dec. 31, 2014
Class of Stock [Line Items]
Number of equity incentive plans	3
Stock options | 2012 Plan
Class of Stock [Line Items]
Vesting period (in years)	4 years
Award vesting percentage at end of one year (percent)	25.00%
Expiration period of granted options (in years)	10 years

Common_stock_Early_exercise_of

Common stock (Early exercise of stock options) (Details) (USD $)	Dec. 31, 2014	Dec. 31, 2013	Dec. 31, 2012
In Thousands, except Share data, unless otherwise specified
Disclosure of Compensation Related Costs, Share-based Payments [Abstract]
Unvested shares subject to repurchase rights at original issuance price (in shares)	2,358	14,360	48,260
Exercise of unvested stock options included in accrued liabilities	$12	$100	$200

Common_stock_Options_outstandi

Common stock (Options outstanding) (Details) (USD $)	12 Months Ended
	Dec. 31, 2014	Dec. 31, 2013	Dec. 31, 2012
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Change in Fair Value Of Warrant Liability Recorded in Other Income (Expense)			($1,600,000)
Weighted-average grant-date fair value (in dollars per share)	$4.77	$7.34	$10.19
Share-based Compensation Arrangement by Share-based Payment Award, Options, Vested and Expected to Vest [Abstract]
Options vested and expected to vest (Number of options)	3,318,085
Options vested and expected to vest (Wtd avg exercise price)	$9.72
Options vested and expected to vest (Wtd avg remaining contractual term)	6 years 1 month 24 days
Options vested and expected to vest (Aggregate intrinsic value)	12,100,000
Options vested and exercisable (Number of options)	2,076,366
Options vested and exercisable (Wtd avg exercise price)	$7.35
Options vested and exercisable (Wtd avg remaining contractual term)	4 years 5 months 27 days
Stock options
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Unrecognized net compensation cost related to options	6,400,000
Weighted average period (in years)	2 years 9 months
Share-based Compensation Arrangement by Share-based Payment Award, Options, Outstanding [Roll Forward]
Number of Options, Outstanding, Beginning balance	3,287,207
Options granted	1,055,949
Options exercised	-293,615
Number of Options, Outstanding, Ending balance	3,418,624	3,287,207
Share-based Compensation Arrangement by Share-based Payment Award, Options, Outstanding, Weighted Average Exercise Price [Roll Forward]
Weighted Average Exercise Price, Outstanding, Beginning balance	$9.62
Wtd Avg Remaining Contractual Term, Options Outstanding	6 years 2 months 27 days	6 years 5 months 12 days
Options granted	$11.54
Options exercised	$3.73
Wtd Avg Remaining Contractual Term, Options Outstanding	6 years 2 months 27 days	6 years 5 months 12 days
Weighted Average Exercise Price, Outstanding, Ending balance	$9.80	$9.62
Share-based Compensation Arrangement by Share-based Payment Award, Options, Forfeitures and Expirations in Period	-630,917
Share-based Compensation Arrangement by Share-based Payment Award, Options, Forfeitures and Expirations in Period, Weighted Average Exercise Price	$14.59
Share-based Compensation Arrangement by Share-based Payment Award, Options, Aggregate Intrinsic Value [Abstract]
Aggregate Intrinsic Value, Options Outstanding	$12,167,000	$24,880,000

Common_stock_Fair_value_option

Common stock (Fair value option pricing model) (Details) (USD $)	12 Months Ended
In Thousands, except Per Share data, unless otherwise specified	Dec. 31, 2014	Dec. 31, 2013	Dec. 31, 2012
Options - intrinsic value and grant date fair value [Abstract]
Options vested and exercisable (Aggregate intrinsic value)	$11,346
Weighted-average grant-date fair value (in dollars per share)	$4.77	$7.34	$10.19
Stock options
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Dividend yield	0.00%	0.00%	0.00%
Stock options | Minimum
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Expected life (years)	5 years 4 months 28 days	5 years 4 months 17 days	5 years 2 months 23 days
Expected Volatility Rate	41.40%	46.70%	47.90%
Risk-free interest rate	1.59%	0.81%	0.72%
Stock options | Maximum
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Expected life (years)	5 years 5 months 12 days	5 years 5 months 5 days	5 years 7 months 6 days
Expected Volatility Rate	48.20%	48.10%	48.70%
Risk-free interest rate	1.78%	1.80%	1.03%

Common_stock_Employee_options_

Common stock (Employee options vested and exercised) (Details) (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]
Options, Exercises in Period, Total Intrinsic Value	$2,997	$5,896	$24,846

Common_stock_Restricted_stock_

Common stock (Restricted stock awards and restricted stock units) (Details) (USD $)	Dec. 31, 2014	Dec. 31, 2013
Restricted Stock [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Employee Service Share-based Compensation, Nonvested Awards, Compensation Not yet Recognized, Share-based Awards Other than Options	$0
Outstanding, Number of Shares	0	12,076
Outstanding, Wtd Ag Grant Date Fair Value	$0	$12.42
Restricted Stock Units (RSUs)
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Employee Service Share-based Compensation, Nonvested Awards, Compensation Not yet Recognized, Share-based Awards Other than Options	$0
Outstanding, Number of Shares	-1,062,590	755,271
Outstanding, Wtd Ag Grant Date Fair Value	$13.79	$19.24
Vesting percentage on 1st anniversary of grant (percent)	33.33%
Vesting percentage on 2nd anniversary of grant (percent)	33.33%
Vesting percentage on 3rd anniversary of grant (percent)	33.34%
Director | Restricted Stock [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Vesting percentage on 1st anniversary of grant (percent)	50.00%
Vesting percentage on 2nd anniversary of grant (percent)	50.00%

Common_stock_Summary_of_restri

Common stock (Summary of restricted stock activity) (Details) (USD $)	12 Months Ended
	Dec. 31, 2014	Dec. 31, 2013
Restricted Stock Awards
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Employee Service Share-based Compensation, Nonvested Awards, Compensation Not yet Recognized, Share-based Awards Other than Options	$0
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Nonvested, Number of Shares [Roll Forward]
Outstanding, Number of Shares	12,076
Granted, Number of Shares	0
Vested, Number of Shares	-12,076
Forfeited, Number of Shares	0
Outstanding, Number of Shares	0
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Additional Disclosures [Abstract]
Granted, Wtd Avg Grant Date Fair Value	$0
Vested, Wtd Avg Grant Date Fair Value	$12.42
Forfeitured, Wtd Avg Grant Date Fair Value	$0
Outstanding, Wtd Ag Grant Date Fair Value	$0	$12.42
Restricted Stock Units
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Weighted average period (in years)	1 year 11 months
Employee Service Share-based Compensation, Nonvested Awards, Compensation Not yet Recognized, Share-based Awards Other than Options	$0
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Nonvested, Number of Shares [Roll Forward]
Outstanding, Number of Shares	755,271
Granted, Number of Shares	823,554
Vested, Number of Shares	-327,562
Forfeited, Number of Shares	-188,673
Outstanding, Number of Shares	-1,062,590
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Additional Disclosures [Abstract]
Granted, Wtd Avg Grant Date Fair Value	$11.64
Vested, Wtd Avg Grant Date Fair Value	$19.11
Forfeitured, Wtd Avg Grant Date Fair Value	$16.97
Outstanding, Wtd Ag Grant Date Fair Value	$13.79	$19.24

Common_stock_Unrecognized_net_

Common stock (Unrecognized net compensation) (Details)	12 Months Ended
	Dec. 31, 2014
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Expected dividend yield	0.00%

Common_stock_Granted_employee_

Common stock (Granted employee and nonemployee options) (Details) (USD $)	12 Months Ended
	Dec. 31, 2014	Dec. 31, 2013	Dec. 31, 2012
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Fair Value of Common Stock per Share	$4.77	$7.34	$10.19

Common_stock_Nonemployee_stock

Common stock (Nonemployee stock-based compensation) (Details) (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	$11,084	$8,667	$4,232

Common_stock_Recognized_expens

Common stock (Recognized expenses nonemployee stock-based compensation) (Details) (USD $)	12 Months Ended
In Thousands, except Share data, unless otherwise specified	Dec. 31, 2014	Dec. 31, 2013	Dec. 31, 2012
Share-based Compensation Arrangement by Share-based Payment Award, Compensation Cost [Line Items]
Share-based Compensation Arrangement by Share-based Payment Award, Options, Modified to Allow Continued Vesting	84,758
Share-based Goods and Nonemployee Services Transaction [Line Items]
Stock-based compensation expense	$11,084	$8,667	$4,232
Restricted stock units
Share-based Compensation Arrangement by Share-based Payment Award, Compensation Cost [Line Items]
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Modified to Allow Continued Vesting	35,528

Common_stock_Common_stock_Shar

Common stock (Common stock) Share-based compensation allocated to expense captions (Details) (USD $)	12 Months Ended
In Thousands, unless otherwise specified	Dec. 31, 2014	Dec. 31, 2013	Dec. 31, 2012
Employee Service Share-based Compensation, Allocation of Recognized Period Costs [Line Items]
Stock-based compensation expense	$11,084	$8,667	$4,232
Cost of Sales [Member]
Employee Service Share-based Compensation, Allocation of Recognized Period Costs [Line Items]
Stock-based compensation expense	1,178	967	421
Research and Development Expense [Member]
Employee Service Share-based Compensation, Allocation of Recognized Period Costs [Line Items]
Stock-based compensation expense	1,056	861	449
Selling and Marketing Expense [Member]
Employee Service Share-based Compensation, Allocation of Recognized Period Costs [Line Items]
Stock-based compensation expense	4,111	2,942	1,262
General and Administrative Expense [Member]
Employee Service Share-based Compensation, Allocation of Recognized Period Costs [Line Items]
Stock-based compensation expense	$4,739	$3,897	$2,100

Common_stock_Common_Stock_ESPP

Common stock Common Stock (ESPP B-S-M option pricing model assumptions) (Details) (USD $)	12 Months Ended
	Dec. 31, 2014	Dec. 31, 2013	Dec. 31, 2012
ESPP plan details [Abstract]
Stock Shares Issued During Period, ESPP	160,936
Common stock (in shares) reserved for ESPP	666,834
Two Thousand Twelve Employee Stcok Purchase Plan [Member] | Employee Stock [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Dividend yield	0.00%	0.00%	0.00%
ESPP plan details [Abstract]
ESPP-Maximum Annual Purchase by Employee, Percent	15.00%
ESPP-Discount of market Price	85.00%
ESPP-Offering Period, Initial Offer	11 months
ESPP-Offering Period, Subsequent Offers	6 months
Share-based Comp, Per Share Wtd Avg Price of Shares Purchased	$9.87	$13.92
Common stock (in shares) reserved for ESPP	282,655
Two Thousand Twelve Employee Stcok Purchase Plan [Member] | Employee Stock [Member] | Minimum
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Expected life (years)	6 months	3 months	6 months
Expected Volatility Rate	35.90%	33.30%	43.20%
Risk-free interest rate	0.05%	0.05%	0.14%
Two Thousand Twelve Employee Stcok Purchase Plan [Member] | Employee Stock [Member] | Maximum
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Expected life (years)		6 months	10 months 17 days
Expected Volatility Rate	57.70%	36.00%	50.00%
Risk-free interest rate	0.10%	0.13%	0.18%

Common_stock_Common_stock_and_

Common stock Common stock and preferred stock warrants (Details) (USD $)	12 Months Ended
	Dec. 31, 2014	Dec. 31, 2013	Dec. 31, 2012
Change in Fair Value Of Warrant Liability Recorded in Other Income (Expense)			($1,600,000)
Proceeds from Warrant Exercises	0	226,000	0
Cash Exercise [Member]
Proceeds from Warrant Exercises		$226,000

Segments_Summary_of_the_operat

Segments Summary of the operating segments (Details) (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 Information [Line Items]
Number of Reportable Segments									2
Revenue
Product									$51,095	$62,393	$65,028
Service									44,326	40,105	35,929
Total revenue	24,602	23,124	23,019	24,676	28,722	26,067	25,296	22,413	95,421	102,498	100,957
Cost of revenue
Product									18,766	21,714	21,551
Service									18,470	16,595	15,070
Cost of Goods and Services Sold									37,236	38,309	36,621
Gross Profit [Abstract]
Gross Profit, Goods									32,329	40,679	43,477
Gross Profit, Services									25,856	23,510	20,859
Gross profit	15,708	13,535	14,070	14,872	18,403	16,277	15,790	13,719	58,185	64,189	64,336
Operating Expenses									86,264	74,749	59,440
Interest income (expense) and other									106	204	-1,376
(Loss) income before income taxes									($27,973)	($10,356)	$3,520

Segments_Summary_of_revenue_by

Segments Summary of revenue by product line (Details) (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
Revenue from External Customer [Line Items]
Product									$51,095	$62,393	$65,028
Service									44,326	40,105	35,929
Total revenue	24,602	23,124	23,019	24,676	28,722	26,067	25,296	22,413	95,421	102,498	100,957
Devices
Revenue from External Customer [Line Items]
Product									37,455	46,636	47,725
Software
Revenue from External Customer [Line Items]
Product									13,640	15,757	17,303
Maintenance and support
Revenue from External Customer [Line Items]
Service									35,353	31,559	26,237
Professional services and training
Revenue from External Customer [Line Items]
Service									$8,973	$8,546	$9,692

Segments_Schedule_of_revenue_b

Segments Schedule of revenue by geographic region (Details) (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
Geographic Areas, Revenues from External Customers [Abstract]
Total revenue	$24,602	$23,124	$23,019	$24,676	$28,722	$26,067	$25,296	$22,413	$95,421	$102,498	$100,957
Geographic Areas, Long-Lived Assets [Abstract]
Property and equipment, net	5,122				5,365				5,122	5,365	3,631
Concentration Risks, Types, No Concentration Percentage [Abstract]
No. of revenue customers with 10% or greater concentration									0	0	0
No of Acct Rec customers with 10% or greater concentration	0				0				0	0
United States
Geographic Areas, Revenues from External Customers [Abstract]
Total revenue									86,007	91,763	90,108
Geographic Areas, Long-Lived Assets [Abstract]
Property and equipment, net	4,852				5,249				4,852	5,249	3,465
International
Geographic Areas, Revenues from External Customers [Abstract]
Total revenue									9,414	10,735	10,849
Geographic Areas, Long-Lived Assets [Abstract]
Property and equipment, net	$270				$116				$270	$116	$166

Income_Taxes_Details

Income Taxes (Details) (USD $)	12 Months Ended
In Thousands, unless otherwise specified	Dec. 31, 2014	Dec. 31, 2013	Dec. 31, 2012
Income Tax Disclosure [Abstract]
United States	($28,442)	($10,812)	$3,205
International	469	456	315
Total (loss) income before income taxes	($27,973)	($10,356)	$3,520

Income_Taxes_Components_of_the

Income Taxes (Components of the provision (benefit) for income taxes) (Details) (USD $)	12 Months Ended
In Thousands, unless otherwise specified	Dec. 31, 2014	Dec. 31, 2013	Dec. 31, 2012
Current
Federal	$0	$0	$7
State	14	-40	512
Foreign	204	74	38
Current Income Tax Expense (Benefit)	218	34	557
Deferred
Federal	134	60	60
State	-4	4	10
Foreign	-24	11	0
Deferred Income Tax Expense (Benefit)	106	75	70
Total income tax provision	$324	$109	$627

Income_Taxes_Reconciliation_of

Income Taxes (Reconciliation of the provision for income taxes at the statutory rate to the company's provision for income tax) (Details) (USD $)	12 Months Ended
In Thousands, unless otherwise specified	Dec. 31, 2014	Dec. 31, 2013	Dec. 31, 2012
Income Tax Disclosure [Abstract]
U.S. federal (tax benefit) provision at statutory rate	($9,511)	($3,567)	$1,197
State (tax benefit) income taxes, net of federal benefit	-895	-338	151
Foreign income taxes at rates other than the US rate	43	-28	-10
Nondeductible Share-based Compensation Cost	763	549	397
Change in valuation allowance	10,203	3,911	-1,494
Non-deductible warrant expense	0	0	625
Research and development credits	-466	-527	220
Other	187	109	-19
Total income tax provision	$324	$109	$627
Effective Income Tax Rate, Percent [Abstract]
Effective tax rate	-1.20%	-1.10%	17.80%

Income_Taxes_Deferred_tax_asse

Income Taxes (Deferred tax assets) (Details) (USD $)	12 Months Ended
	Dec. 31, 2014	Dec. 31, 2013	Dec. 31, 2012	Dec. 31, 2011
Income Tax Disclosure [Abstract]
Net operating loss carryforward	$19,190,000	$11,873,000
Research and development credits	3,360,000	2,809,000
Deferred Tax Assets, Property, Plant and Equipment	650,000	288,000
Reserves and accruals	6,900,000	6,060,000
Total deferred tax assets	30,100,000	21,030,000
Valuation allowance	-30,072,000	-21,030,000	-21,193,000	-22,687,000
Net deferred tax assets	28,000	0
Deferred tax liabilities	-352,000	-216,000
Net deferred tax liabilities	-324,000	-216,000
Deferred tax assets (increase) decrease	($9,000,000)	$200,000

Income_Taxes_Tax_carry_forward

Income Taxes (Tax carry forwards) (Details) (USD $)	12 Months Ended
	Dec. 31, 2014	Dec. 31, 2013
Tax Credit Carryforward [Line Items]
Tax Credit Carryforward, Amount	$500,000
Research and development credits	3,360,000	2,809,000
Deferred tax assets decrease	-9,000,000	200,000
Tax Credit Carryforward, Limitations on Use	600000
Federal | Federal R&D tax credits carryforwards [Member]
Tax Credit Carryforward [Line Items]
Research and development credits	2,000,000
State | State R&D tax credits carryforwards [Member]
Tax Credit Carryforward [Line Items]
Research and development credits	$3,000,000

Income_Taxes_Income_Taxes_Oper

Income Taxes Income Taxes (Operating Loss Carryovers) (Details) (USD $)	12 Months Ended
	Dec. 31, 2014
Operating Loss Carryforwards [Line Items]
Operating Loss Carryforwards, Limitations on Use	$12,200,000
Document Period End Date	31-Dec-14
Operating Loss Carryforwards	7,500,000
Federal
Operating Loss Carryforwards [Line Items]
Operating Loss Carryforwards	71,400,000
State
Operating Loss Carryforwards [Line Items]
Operating Loss Carryforwards	42,600,000
Excess Stock Option Deductions [Member] | Federal
Operating Loss Carryforwards [Line Items]
Operating Loss Carryforwards	$33,900,000

Income_Taxes_income_Taxes_DTA_

Income Taxes (income Taxes) DTA Valuation Allowance Rollforward (Details) (USD $)	12 Months Ended
In Thousands, unless otherwise specified	Dec. 31, 2014	Dec. 31, 2013	Dec. 31, 2012
Income Taxes (DTA Valuation Allowance Rollforward) [Abstract]
Balance at the beginning of the period	$21,030	$21,193	$22,687
Net operating loss carryforwards generated (utilization)	7,317	-2,397	-3,505
R&D tax credit increase	551	172	272
Depreciation and amortization increase	362	204	29
Reserves and accruals increase	840	1,558	1,273
Deferred tax assets decrease (increase)	-28	300	437
Balance at the end of the period	$30,072	$21,030	$21,193

Income_Taxes_Changes_in_unreco

Income Taxes (Changes in unrecognized tax benefits) (Details) (USD $)	12 Months Ended
	Dec. 31, 2014	Dec. 31, 2013
Income Tax Disclosure [Abstract]
Unrecognized Tax Benefits, Income Tax Penalties and Interest Expense	$13,000	$26,000
Reconciliation of Unrecognized Tax Benefits, Excluding Amounts Pertaining to Examined Tax Returns [Roll Forward]
Gross amount of unrecognized tax benefits as of the beginning of the period	1,092,000	1,079,000
Increases related to prior year tax provisions	25,000	30,000
Decreases related to prior year tax provisions	0	-239,000
Increases related to current year tax provisions	148,000	222,000
Gross amount of unrecognized tax benefits as of the end of the period	$1,265,000	$1,092,000

Income_Taxes_NonUS_Subsidiarie

Income Taxes (Non-U.S. Subsidiaries' Undistributed Earnings) (Details) (USD $)	Dec. 31, 2014
In Millions, unless otherwise specified
Income Tax Disclosure [Abstract]
Undistributed Earnings of Foreign Subsidiaries	$1.20

Business_Acquisitions_Details

Business Acquisitions (Details) (Customer relationships, Net assets of mVisum, Inc. [Member], USD $)	Jan. 13, 2014
In Thousands, unless otherwise specified
Customer relationships | Net assets of mVisum, Inc. [Member]
Business Acquisition [Line Items]
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Finite-Lived Intangibles	$170

Business_Acquisitions_Acquisit

Business Acquisitions Acquisition of mVisium Net Assets (Details) (USD $)	0 Months Ended	12 Months Ended
	Jan. 13, 2014	Dec. 31, 2014	Dec. 31, 2013
Business Acquisition [Line Items]
Goodwill		9,988,000	$5,575,000
Net assets of mVisum, Inc. [Member]
Business Acquisition [Line Items]
Payments to Acquire Businesses, Gross	3,500,000
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Current Assets, Receivables	187,000
Goodwill	2,103,000
Total assets acquired including Goodwill	3,590,000
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Current Liabilities, Deferred Revenue	-90,000
Business Combination, Recognized Identifiable Assets Acquired, Goodwill, and Liabilities Assumed, Net	3,500,000
Acquired Finite-lived Intangible Assets, Weighted Average Useful Life	5 years 8 months 1 day
Business Combination, Acquisition Related Costs	200,000
future bonus compensation	500,000
Technology-Based Intangible Assets [Member] | Net assets of mVisum, Inc. [Member]
Business Acquisition [Line Items]
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Finite-Lived Intangibles	830,000
Non-compete Agreements | Net assets of mVisum, Inc. [Member]
Business Acquisition [Line Items]
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Finite-Lived Intangibles	260,000
Customer relationships | Net assets of mVisum, Inc. [Member]
Business Acquisition [Line Items]
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Finite-Lived Intangibles	170,000
Trademarks and Trade Names [Member] | Net assets of mVisum, Inc. [Member]
Business Acquisition [Line Items]
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Finite-Lived Intangibles	$40,000
Minimum [Member] | Net assets of mVisum, Inc. [Member]
Business Acquisition [Line Items]
Weighted average useful life (years)	4 years
Minimum [Member] | Technology-Based Intangible Assets [Member]
Business Acquisition [Line Items]
Weighted average useful life (years)		4 years
Minimum [Member] | Non-compete Agreements
Business Acquisition [Line Items]
Weighted average useful life (years)		2 years
Minimum [Member] | Customer relationships
Business Acquisition [Line Items]
Weighted average useful life (years)		7 years
Minimum [Member] | Trademarks and Trade Names [Member]
Business Acquisition [Line Items]
Weighted average useful life (years)		4 years
Maximum [Member] | Net assets of mVisum, Inc. [Member]
Business Acquisition [Line Items]
Weighted average useful life (years)	7 years
Maximum [Member] | Technology-Based Intangible Assets [Member]
Business Acquisition [Line Items]
Weighted average useful life (years)		7 years
Maximum [Member] | Non-compete Agreements
Business Acquisition [Line Items]
Weighted average useful life (years)		4 years
Maximum [Member] | Customer relationships
Business Acquisition [Line Items]
Weighted average useful life (years)		9 years
Maximum [Member] | Trademarks and Trade Names [Member]
Business Acquisition [Line Items]
Weighted average useful life (years)		7 years

Business_Acquisitions_Acquisit1

Business Acquisitions Acquisition of Prana Technologies assets (Details) (USD $)	0 Months Ended	12 Months Ended
	Aug. 08, 2014	Dec. 31, 2014	Dec. 31, 2013
Business Acquisition [Line Items]
Goodwill		$9,988,000	$5,575,000
Prana Technologies [Member]
Business Acquisition [Line Items]
Payments to Acquire Businesses, Gross	3,450,000
Goodwill	2,310,000
Payments to Employees		800,000
Business Combination, Acquisition Related Costs		100,000
Non-compete Agreements | Prana Technologies [Member]
Business Acquisition [Line Items]
Weighted average useful life (years)	2 years
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Finite-Lived Intangibles	200,000
In Process Research and Development [Member] | Prana Technologies [Member]
Business Acquisition [Line Items]
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Indefinite-Lived Intangible Assets	$940,000

Quarterly_results_of_operation2

Quarterly results of operations (unaudited) (Details) (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]
Revenue, Net	$24,602	$23,124	$23,019	$24,676	$28,722	$26,067	$25,296	$22,413	$95,421	$102,498	$100,957
Gross Profit	15,708	13,535	14,070	14,872	18,403	16,277	15,790	13,719	58,185	64,189	64,336
Net (loss) income	-7,009	-7,891	-7,008	-6,389	-1,842	-3,102	-2,022	-3,499	-28,297	-10,465	2,893
Net Income (Loss) Available to Common Stockholders, Basic	($7,009)	($7,891)	($7,008)	($6,389)	($1,842)	($3,102)	($2,022)	($3,499)	($28,297)	($10,465)	$1,527
Basic and diluted	($0.27)	($0.31)	($0.28)	($0.26)	($0.07)	($0.13)	($0.08)	($0.14)	($1.12)	($0.43)	$0.08
Weighted Average Number of Shares Outstanding, Basic	25,572	25,432	25,246	25,047	24,893	24,747	24,555	24,282