Vocera Communications (VCRA) 10-Q 6 May 16 2016 Q1 Quarterly report Financial data

Document and Entity Information

Document and Entity Information - shares	3 Months Ended
	Mar. 31, 2016	May. 05, 2016
Document and Entity Information [Abstract]
Entity Registrant Name	VOCERA COMMUNICATIONS, INC.
Entity Central Index Key	1,129,260
Document Type	10-Q
Document Period End Date	Mar. 31, 2016
Amendment Flag	false
Document Fiscal Year Focus	2,016
Document Fiscal Period Focus	Q1
Current Fiscal Year End Date	--12-31
Entity Filer Category	Accelerated Filer
Entity Common Stock, Shares Outstanding		26,502,591

Condensed Consolidated Balance

Condensed Consolidated Balance Sheets - USD ($) $ in Thousands	Mar. 31, 2016	Dec. 31, 2015
Current assets
Cash and cash equivalents	$ 22,400	$ 20,572
Short-term investments	97,829	96,202
Accounts receivable, net of allowance	14,433	22,605
Other receivables	1,112	1,009
Inventories	3,613	2,713
Prepaid expenses and other current assets	2,242	2,165
Total current assets	141,629	145,266
Property and equipment, net	4,523	3,620
Intangible assets, net	2,189	2,375
Goodwill	9,988	9,988
Other long-term assets	1,288	1,012
Total assets	159,617	162,261
Current liabilities
Accounts payable	4,212	2,932
Product Warranty Accrual, Current	584	806
Accrued payroll and other current liabilities	10,787	13,339
Deferred revenue, current	30,975	31,495
Total current liabilities	45,974	47,766
Deferred revenue, long-term	7,865	8,097
Other long-term liabilities	2,116	1,967
Total liabilities	$ 55,955	$ 57,830
Commitments and contingencies (Note 7)
Stockholders' equity
Preferred stock, $0.0003 par value - 5,000,000 shares authorized as of March 31, 2016 and December 31, 2015; zero shares issued and outstanding	$ 0	$ 0
Common stock, $0.0003 par value - 100,000,000 shares authorized as of March 31, 2016 and December 31, 2015; 26,442,307 and 26,322,322 shares issued and outstanding as of March 31, 2016 and December 31, 2015, respectively	8	8
Additional paid-in capital	217,064	214,421
Accumulated other comprehensive income (loss)	10	(162)
Accumulated deficit	(113,420)	(109,836)
Total stockholders’ equity	103,662	104,431
Total liabilities and stockholders’ equity	$ 159,617	$ 162,261

Condensed Consolidated Balance3

Condensed Consolidated Balance Sheets Condensed Consolidated Balance Sheets (Paranthetical) - $ / shares	Mar. 31, 2016	Dec. 31, 2015
Liabilities and stockholders' equity
Common stock par value	$ 0.0003	$ 0.0003
Common stock shares authorized	100,000,000	100,000,000
Common stock shares issued	26,442,307	26,322,322
Common stock shares outstanding	26,442,307	26,322,322
Preferred Stock
Liabilities and stockholders' equity
Preferred stock par value	$ 0.0003	$ 0.0003
Preferred stock shares authorized	5,000,000	5,000,000
Preferred stock shares issued	0	0
Preferred stock shares outstanding	0	0

Condensed Consolidated Statemen

Condensed Consolidated Statements of Operations - USD ($) shares in Thousands, $ in Thousands	3 Months Ended
	Mar. 31, 2016	Mar. 31, 2015
Revenue
Product	$ 13,802	$ 12,462
Service	12,975	11,356
Total revenue	26,777	23,818
Cost of revenue
Product	4,449	4,432
Service	5,650	4,851
Total cost of revenue	10,099	9,283
Gross profit	16,678	14,535
Operating expenses
Research and development	3,972	4,483
Sales and marketing	12,026	10,414
General and administrative	4,336	4,000
Total operating expenses	20,334	18,897
Loss from operations	(3,656)	(4,362)
Interest income	178	110
Other expense, net	(14)	(132)
Loss before income taxes	(3,492)	(4,384)
Provision for income taxes	(92)	(103)
Net loss	$ (3,584)	$ (4,487)
Net loss per share
Basic and Diluted	$ (0.14)	$ (0.17)
Weighted average shares used to compute net loss per share
Basic and Diluted	26,379	25,667

Condensed Consolidated Stateme5

Condensed Consolidated Statements of Comprehensive Income - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2016	Mar. 31, 2015
Statement of Comprehensive Income [Abstract]
Net loss	$ (3,584)	$ (4,487)
Other comprehensive income (loss), net:
Change in unrealized loss on investments, net of tax	172	53
Comprehensive loss	$ (3,412)	$ (4,434)

Condensed Consolidated Stateme6

Condensed Consolidated Statements of Cash Flows - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2016	Mar. 31, 2015
Statement of Cash Flows [Abstract]
Other Operating Activities, Cash Flow Statement	$ 3	$ 144
Cash flows from operating activities
Net loss	3,584	4,487
Adjustments to reconcile net loss to net cash used in operating activities:
Depreciation and amortization	726	845
Inventory provision	3	95
Change in lease-related performance liabilities	(194)	(266)
Stock-based compensation expense	2,546	2,594
Changes in operating assets and liabilities:
Accounts receivable	8,172	3,760
Other receivables	(103)	(647)
Inventories	(903)	672
Prepaid expenses and other assets	(354)	(616)
Accounts payable	568	1,475
Accrued payroll and other liabilities	(2,565)	(2,813)
Deferred revenue	(752)	(1,477)
Net cash used in operating activities	3,563	(721)
Cash flows from investing activities
Purchase of property and equipment	(733)	(264)
Business acquisitions, net of cash acquired	0	0
Purchase of short-term investments	(39,182)	(33,408)
Maturities of short-term investments	37,015	35,887
Proceeds from Sale of Available-for-sale Securities	713	0
Changes in Restricted Cash	0	40
Net cash used in investing activities	(2,187)	2,255
Cash flows from financing activities
Cash from lease-related performance obligations	387	170
Payment for repurchase of early exercised options	0	0
Proceeds from issuance of common stock from the employee stock purchase plan	0	0
Proceeds from exercise of stock options	406	105
Tax withholdings paid on behalf of employees for net share settlement	(341)	(167)
Proceeds from exercise of common stock warrants	0
Net cash provided by financing activities	452	108
Net decrease in cash and cash equivalents	1,828	1,642
Cash and cash equivalents at beginning of period	20,572	22,615
Cash and cash equivalents at end of period	22,400	24,257
Supplemental disclosure of non-cash investing and financing activities:
Property and equipment in accounts payable and accrued liabilities	$ 776	$ 122

The Company and Summary of Sign

The Company and Summary of Significant Accounting Policies	3 Months Ended
	Mar. 31, 2016
Accounting Policies [Abstract]
The Company and Summary of Significant Accounting Policies	The Company and Summary of Significant Accounting Policies Organization and Business Vocera Communications, Inc. (the “Company” or "Vocera") 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 United States and internationally. The significant majority of the Company's business is currently generated from sales of its solutions in the healthcare market to help its customers improve patient safety and experience and increase operational efficiency. As of March 31, 2016 the Company's solutions have been selected by more than 1,400 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. Other software applications help improve care coordination, patient safety, and patient satisfaction. Basis of Presentation The Company’s unaudited condensed consolidated financial statements have been prepared in accordance with accounting principles generally accepted in the United States of America (“U.S. GAAP”) and pursuant to the instructions to Form 10-Q and Article 10 of Regulation S-X of the U.S. Securities and Exchange Commission, and include the accounts of Vocera and its wholly owned subsidiaries. All intercompany balances and transactions have been eliminated. Certain information and disclosures normally included in financial statements prepared in accordance with U.S. GAAP have been condensed or omitted pursuant to such rules and regulations. Accordingly, these unaudited interim condensed consolidated financial statements should be read in conjunction with the annual audited consolidated financial statements and notes thereto contained in the Company's Annual Report on Form 10-K for the year ended December 31, 2015 . The year-end condensed balance sheet data was derived from the Company's audited financial statements, but does not include all disclosures required by U.S. GAAP. In the opinion of management, the accompanying unaudited condensed consolidated financial statements reflect all adjustments, which include only normal recurring adjustments, necessary to present fairly the Company’s interim consolidated financial information. The results for the quarter presented are not necessarily indicative of the results to be expected for the year ending December 31, 2016 or for any other interim period or any other future year. Use of Estimates The preparation of the accompanying unaudited condensed consolidated financial statements in conformity with U.S. 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, useful lives assigned to long-lived assets, excess and obsolete inventory charges, warranty 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. Revenue Recognition The Company derives revenue from the sales of communication badges, perpetual software licenses for software that is essential to the functionality of the communication badges, smartphones, 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 and certain hosted software subscriptions. The Company's revenue recognition policy has not changed from that described in its Annual Report on Form 10-K for the year ended December 31, 2015 . Transfer of sales-type leases to third-parties 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 three months ended March 31, 2016 and 2015 , the Company transferred $0.3 million and $0.5 million , respectively, of lease receivables in non-recourse sales to third-party financial companies, with immaterial net gains (losses). For the three months ended March 31, 2016 and 2015 , the Company recorded $0.4 million and $0.2 million , respectively, of financing liabilities for future performance of executory service obligations. For lease receivables retained as of March 31, 2016 and December 31, 2015 , the Company recorded $2.0 million and $1.5 million of net investment in sales-type leases, respectively, equivalent to the minimum lease payments less the unearned interest portion. Recent Accounting Pronouncements In May 2014, the Financial Accounting Standards Board (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. In July 2015 the FASB affirmed a one-year deferral of the effective date of the new revenue standard. The Company’s effective date for this standard will be the first quarter of 2018. Early adoption is permitted but not before the original effective date of annual reporting periods beginning after December 15, 2016. 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, 2018. 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. In November 2015, the FASB issued new guidance to eliminate the requirement for companies to separate deferred income tax liabilities and assets into current and noncurrent amounts on the balance sheet. Instead, companies will be required to classify all deferred tax liabilities and assets as noncurrent. The Company has elected to early adopt this new guidance during the fourth quarter of fiscal year 2015 on a prospective basis as permitted under the standard, which did not result in a material change to the Company's financial statements. Prior periods were not retrospectively adjusted. In February 2016, the FASB amended lease accounting requirements to begin recording assets and liabilities arising from leases on the balance sheet. The new guidance will also require significant additional disclosures about the amount, timing and uncertainty of cash flows from leases. This new guidance will be effective for us beginning on January 1, 2019 using a modified retrospective approach. The modified retrospective approach includes a number of optional practical expedients that entities may elect to apply. 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. In March 2016, the FASB issued new guidance related to accounting for stock-based payment award transactions. The guidance is designed to simplify several aspects of accounting for share-based payment award transactions, including the income tax consequences, classification of awards as either equity or liabilities, classification on the statement of cash flows and forfeiture rate calculations. The guidance is effective for financial statements issued for fiscal years beginning after December 15, 2017, with early adoption permitted. The Company is evaluating the impact of this new guidance on the consolidated financial statements and the related disclosures.

Fair Value of Financial Instrum

Fair Value of Financial Instruments	3 Months Ended
	Mar. 31, 2016
Fair Value Disclosures [Abstract]
Fair Value of Financial Instruments	Fair Value of Financial Instruments The Company’s cash, cash equivalents and short-term investments are carried at their fair values with any differences from their amortized cost recorded in equity as unrealized gains (losses) on marketable securities. As a basis for determining the fair value of its assets and liabilities, the Company follows 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 three months ended March 31, 2016 , 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 Company’s assets that are measured at fair value on a recurring basis, by level, within the fair value hierarchy as of March 31, 2016 and December 31, 2015 , are summarized as follows (in thousands): March 31, 2016 December 31, 2015 Level 1 Level 2 Total Level 1 Level 2 Total Assets Money market funds $ 3,087 $ — $ 3,087 $ 7,532 $ — $ 7,532 Commercial paper 1,300 1,798 3,098 — — — U.S. government agency securities 100 11,901 12,001 — 13,009 13,009 U.S. Treasury securities — 7,365 7,365 — 5,843 5,843 Municipal debt securities — — — — — — Corporate debt securities 2,920 76,765 79,685 1,152 77,350 78,502 Total assets measured at fair value $ 7,407 $ 97,829 $ 105,236 $ 8,684 $ 96,202 $ 104,886 The Company had no liabilities as of March 31, 2016 and December 31, 2015 that were measured at fair value on a recurring basis.

Cash, Cash Equivalents and Shor

Cash, Cash Equivalents and Short-term Investments	3 Months Ended
	Mar. 31, 2016
Cash and Cash Equivalents [Abstract]
Cash, Cash Equivalents, and Short-term Investments	Cash, Cash Equivalents and Short-Term Investments The following tables present current and prior-year-end balances for cash, cash equivalents and short-term investments (in thousands): As of March 31, 2016 Amortized Cost Unrealized Gains Unrealized Losses Fair value Cash and cash equivalents: Demand deposits and other cash $ 14,993 $ — $ — $ 14,993 Money market funds 3,087 — — 3,087 Commercial paper 1,300 — — 1,300 U.S. government agency securities 100 — — 100 Corporate debt securities 2,920 — — 2,920 Total cash and cash equivalents 22,400 — — 22,400 Short-Term Investments: Commercial paper 1,798 — — 1,798 U.S. government agency securities 11,896 6 (1 ) 11,901 U.S. Treasury securities 7,359 6 — 7,365 Corporate debt securities 76,766 33 (34 ) 76,765 Total short-term investments 97,819 45 (35 ) 97,829 Total cash, cash equivalents and short-term investments $ 120,219 $ 45 $ (35 ) $ 120,229 As of December 31, 2015 Amortized Cost Unrealized Gains Unrealized Losses Fair value Cash and cash equivalents: Demand deposits and other cash $ 11,888 $ — $ — $ 11,888 Money market funds 7,532 — — 7,532 Corporate debt securities 1,152 — — 1,152 Total cash and cash equivalents 20,572 — — 20,572 Short-Term Investments: U.S. government agency securities 13,038 — (29 ) 13,009 U.S. Treasury securities 5,855 — (12 ) 5,843 Corporate debt securities 77,471 4 (125 ) 77,350 Total short-term investments 96,364 4 (166 ) 96,202 Total cash, cash equivalents and short-term investments $ 116,936 $ 4 $ (166 ) $ 116,774 The Company has determined that the unrealized losses on its short-term investments as of March 31, 2016 and December 31, 2015 do not constitute an "other than temporary impairment." The unrealized losses for the short-term investments 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 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 March 31, 2016 Cash and cash equivalents (1) $ 22,400 $ — $ 22,400 Short-term investments 84,417 13,412 97,829 Cash, cash equivalents and short-term investments $ 106,817 $ 13,412 $ 120,229 Balances as of December 31, 2015 Cash and cash equivalents (1) $ 20,572 $ — $ 20,572 Short-term investments 75,725 20,477 96,202 Cash, cash equivalents and short-term investments $ 96,297 $ 20,477 $ 116,774 (1) Includes demand deposits and other cash, money market funds and other cash equivalent securities, all with 0-90 day maturity at purchase.

Net Loss Per Share

Net Loss Per Share	3 Months Ended
	Mar. 31, 2016
Earnings Per Share [Abstract]
Net Loss Per Share	Net Loss Per Share The following table sets forth the computation of basic and diluted net loss per share (in thousands, except per share amounts): Three months ended March 31, 2016 2015 Numerator: Net loss $ (3,584 ) $ (4,487 ) Denominator: Weighted-average shares used to compute net loss per common share - basic and diluted 26,379 25,667 Net loss per share Basic and diluted $ (0.14 ) $ (0.17 ) The following securities were not included in the calculation of diluted shares outstanding as the effect would have been anti-dilutive: Three months ended March 31, (in thousands) 2016 2015 Options to purchase common stock, including ESPP 3,125 3,440 Common stock subject to repurchase — 1 Warrants to purchase common stock — 44 Restricted stock units 1,371 1,064

Goodwill and Intangible Assets

Goodwill and Intangible Assets	3 Months Ended
	Mar. 31, 2016
Goodwill and Intangible Assets Disclosure [Abstract]
Goodwill and Intangible Assets	Goodwill and Intangible Assets Goodwill As of March 31, 2016 and December 31, 2015 , the Company had $10.0 million and $10.0 million of goodwill, respectively, allocated to the Company's Product operating segment. As of March 31, 2016 , there were no changes in circumstances indicating that the carrying values of goodwill or acquired intangibles may not be recoverable. Intangible Assets Acquisition-related intangible assets are amortized either straight-line, or over the life of the assets on a basis that resembles the economic benefit of the assets. This yields amortization in the latter case that is higher in earlier periods of the useful life. The estimated useful lives and carrying value of acquired intangible assets are as follows: March 31, 2016 December 31, 2015 (in thousands) Range of Useful Life (years) Gross Carrying Amount Accumulated Amortization Net Carrying Amount Gross Carrying Amount Accumulated Amortization Net Carrying Amount Developed technology 4 to 7 $ 3,650 $ 2,194 $ 1,456 $ 3,650 $ 2,094 $ 1,556 Customer relationships 7 to 9 2,520 1,976 544 2,520 1,934 586 Non-compete agreements 2 to 4 460 299 161 460 258 202 Trademarks 4 to 7 110 82 28 110 79 31 Intangible assets, net book value $ 6,740 $ 4,551 $ 2,189 $ 6,740 $ 4,365 $ 2,375 Amortization expense was $0.2 million and $0.2 million for the three months ended March 31, 2016 and 2015 , respectively. Amortization of acquired intangible assets is reflected in the cost of revenue or operating expenses, depending on the nature of the intangible. The estimated future amortization of existing acquired intangible assets as of March 31, 2016 was as follows: (in thousands) Future amortization 2016 (nine months remaining) $ 533 2017 551 2018 441 2019 386 2020 201 2021 77 Future amortization expense $ 2,189

Balance Sheet Components

Balance Sheet Components	3 Months Ended
	Mar. 31, 2016
Balance Sheet Components [Abstract]
Balance Sheet Components	Balance Sheet Components Inventories (in thousands) March 31, December 31, Raw materials $ 86 $ 36 Finished goods 3,527 2,677 Total inventories $ 3,613 $ 2,713 Property and equipment, net (in thousands) March 31, December 31, Computer equipment and software $ 9,889 $ 9,446 Furniture, fixtures and equipment 1,027 1,004 Leasehold improvements 2,450 2,435 Manufacturing tools and equipment 3,263 3,134 Construction in process 941 229 Property and equipment, at cost 17,570 16,248 Less: Accumulated depreciation (13,047 ) (12,628 ) Property and equipment, net $ 4,523 $ 3,620 Depreciation and amortization expense was $0.5 million and $0.7 million for the three months ended March 31, 2016 and 2015 , respectively. Net investment in sales-type leases The Company has sales-type leases with terms of 0.50 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: (in thousands) March 31, December 31, Minimum payments to be received on sales-type leases $ 3,731 $ 2,772 Less: Unearned interest income and executory costs (1,754 ) (1,292 ) Net investment in sales-type leases 1,977 1,480 Less: Current portion (1,007 ) (832 ) Non-current net investment in sales-type leases $ 970 $ 648 There were no allowances for doubtful accounts on these leases as of March 31, 2016 and December 31, 2015 . There is no guaranteed or unguaranteed residual value on the leased equipment. The current and non-current net investments in sales-type leases are reported as components of the consolidated balance sheet captions "other receivables" and "other long-term assets," respectively. The minimum payments expected to be received for future years under sales-type leases as of March 31, 2016 were as follows: (in thousands) Future lease payments 2016 (Remaining nine months) $ 1,137 2017 1,159 2018 869 2019 508 2020 58 Total $ 3,731 Accrued payroll and other current liabilities (in thousands) March 31, December 31, Payroll and related expenses $ 5,625 $ 8,162 Accrued payables 1,975 1,835 Deferred rent, current portion 364 326 Lease financing, current portion 742 706 Product warranty 584 701 Customer prepayments 915 941 Sales and use tax payable 270 285 Other 312 383 Total accrued payroll and other current liabilities $ 10,787 $ 13,339 The changes in the Company's product warranty reserve are as follows: Three months ended March 31, (in thousands) 2016 2015 Warranty balance at the beginning of the period $ 806 $ 497 Warranty expense accrued for shipments during the period 172 64 Changes in estimate related to pre-existing warranties (201 ) 358 Warranty settlements made (157 ) (85 ) Total product warranty $ 620 $ 834 Less: Long-term portion (36 ) $ — Current portion of warranty balance at the end of the period $ 584 $ 834

Commitments

Commitments	3 Months Ended
	Mar. 31, 2016
Commitments and Contingencies Disclosure [Abstract]
Commitments and Contingencies Disclosure	Commitments and Contingencies Non-cancelable Material Commitments The Company is required to purchase unused, non-cancelable, non-returnable raw material inventory that was purchased by its contract manufacturers based on committed finished goods orders from the Company, certain long lead-time raw materials based on the Company’s forecast and current work-in-progress materials. As of March 31, 2016 and December 31, 2015 , approximately $7.1 million and $7.8 million , respectively, of such inventory was purchased and held by the third-party manufacturers which was subject to these purchase guarantees. Leases The Company leases office space for its headquarters and subsidiaries under non-cancelable operating leases, which will expire between December 2016 and March 2022. The Company recognizes rent expense on a straight-line basis over the lease period, and has accrued for rent expense incurred but not paid. Facilities rent expense was $0.6 million and $0.5 million for the three months ended March 31, 2016 and 2015 , respectively. Future minimum lease payments at March 31, 2016 under non-cancelable operating leases are as follows: (in thousands) Operating leases 2016 (remaining nine months) $ 1,471 2017 1,911 2018 1,727 2019 1,601 2020 1,549 2021 1,595 Thereafter 402 Total minimum lease payments $ 10,256 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 rights, tortious damage to persons or property or breaches of certain Company obligations relating to confidentiality (e.g., safeguarding protected health information) 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 February 11, 2015, the Court granted Defendants' motion to dismiss the Securities Act claims, but denied the motion as to the Exchange Act claims, allowing the matter to proceed on that basis. On April 27, 2015 Defendants filed answers to the consolidated complaint. In connection with a mediation, an agreement in principle to settle the suit was reached in October 2015. On March 4, 2016, the Court issued an order granting Lead Plaintiffs' motion for preliminary approval of the settlement. The settlement, which is subject to final approval of the Court, calls for payment of $9 million , which will be funded entirely by the Company's insurance carriers. 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. The Company defends itself vigorously against any such claims. Although the outcome of these matters is currently not determinable, management expects that any losses from existing matters that are probable or reasonably possible of being incurred as a result of these matters would not be material to the financial statements as a whole.

Stock-based Compensation and Aw

Stock-based Compensation and Awards	3 Months Ended
	Mar. 31, 2016
Disclosure of Compensation Related Costs, Share-based Payments [Abstract]
Stock-based Compensation and Award	Stock-based Compensation and Awards Stock Option Activity A summary of the stock option activity for the three months ended March 31, 2016 is presented below: Options outstanding Number of Options Weighted Average Exercise Price Weighted average remaining contractual term Aggregate intrinsic value (in years) (in thousands) Outstanding at December 31, 2015 3,151,680 $ 9.47 5.50 $ 14,587 Options granted — Options exercised (80,239 ) 5.06 Options canceled (2,734 ) 18.26 Outstanding at March 31, 2016 3,068,707 $ 9.57 5.29 $ 15,019 At March 31, 2016 , there was $3.4 million of unrecognized net compensation cost related to options which is expected to be recognized over a weighted-average period of 2.00 years . As of March 31, 2016 , there were 2,625,529 shares that remained available for future issuance of options, restricted stock units (“RSUs”) or other equity awards under the 2012 Equity Incentive Plan. The Company uses the Black-Scholes option-pricing model to calculate the fair value of stock options on their grant date. The following assumptions were used for each respective period for employee stock options: Three months ended March 31, 2015 Expected Term (in years) 5.39 Volatility 41.8% Risk-free interest rate 1.63% Dividend yield 0% Employee Stock Purchase Plan In March 2012, the Company’s 2012 Employee Stock Purchase Plan (the “ESPP”) was approved. No shares of common stock were purchased during the three months ended March 31, 2016 and 2015. As of March 31, 2016 , there were 656,831 shares available for future issuance under the ESPP. The following Black-Scholes option-pricing assumptions were used for each respective period for the ESPP: Three months ended March 31, 2016 2015 Expected Term (in years) 0.50 0.50 Volatility 41.5% 57.8% Risk-free interest rate 0.33% 0.07% Dividend yield 0% 0% Restricted Stock Units A summary of RSU activity for the three months ended March 31, 2016 is presented below: Restricted Stock Units Number of shares Weighted Average Grant Date Fair Value per Share Outstanding at December 31, 2015 1,351,728 $ 11.54 Granted 128,528 14.32 Vested (62,209 ) 15.14 Forfeited (46,647 ) 12.12 Outstanding at March 31, 2016 1,371,400 $ 11.62 At March 31, 2016 , there was $9.8 million of unrecognized net compensation cost related to RSUs, which is expected to be recognized over a weighted-average period of 1.74 years . Allocation of Stock-Based Compensation Expense The following table presents the stock-based compensation allocation of expense: Three months ended March 31, (in thousands) 2016 2015 Cost of revenue $ 269 $ 309 Research and development 226 260 Sales and marketing 1,010 1,034 General and administrative 1,041 991 Total stock-based compensation $ 2,546 $ 2,594

Segments

Segments	3 Months Ended
	Mar. 31, 2016
Segment Reporting [Abstract]
Segments	Segments The Company has two operating segments, which are both reportable business segments: (i) Product and (ii) Service, both of which are comprised of Vocera’s and its wholly-owned subsidiaries’ results of operations. The following table presents a summary of the operating segments: Three months ended March 31, (in thousands) 2016 2015 Revenue Product $ 13,802 $ 12,462 Service 12,975 11,356 Total revenue 26,777 23,818 Cost of Revenue Product 4,449 4,432 Service 5,650 4,851 Total cost of revenue 10,099 9,283 Gross profit Product 9,353 8,030 Service 7,325 6,505 Total gross profit 16,678 14,535 Operating expenses 20,334 18,897 Interest (expense) income, net and other 164 (22 ) Loss before income taxes $ (3,492 ) $ (4,384 )

Income Taxes

Income Taxes	3 Months Ended
	Mar. 31, 2016
Income Tax Disclosure [Abstract]
Income Taxes	Income Taxes The Company recorded a $0.1 million provision and $0.1 million provision for income taxes for the three months ended March 31, 2016 and 2015 , respectively. The provision in both periods was primarily due to taxes on international operations and state income taxes. As of March 31, 2016 , the Company has provided a valuation allowance against certain federal and state deferred tax assets. Management continues to evaluate the realizability of deferred tax assets and the related valuation allowance. If management's assessment of the deferred tax assets or the corresponding valuation allowance were to change, the Company would record the related adjustment to income during the period in which management makes the determination. As of March 31, 2016 , there were no material changes to either the nature or the amounts of the uncertain tax positions previously determined for the year ended December 31, 2015 .

The Company and Summary of Si17

The Company and Summary of Significant Accounting Policies (Policies)	3 Months Ended
	Mar. 31, 2016
Accounting Policies [Abstract]
Nature of Operations	Organization and Business Vocera Communications, Inc. (the “Company” or "Vocera") 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 United States and internationally. The significant majority of the Company's business is currently generated from sales of its solutions in the healthcare market to help its customers improve patient safety and experience and increase operational efficiency. As of March 31, 2016 the Company's solutions have been selected by more than 1,400 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. Other software applications help improve care coordination, patient safety, and patient satisfaction.
Basis of Presentation	Basis of Presentation The Company’s unaudited condensed consolidated financial statements have been prepared in accordance with accounting principles generally accepted in the United States of America (“U.S. GAAP”) and pursuant to the instructions to Form 10-Q and Article 10 of Regulation S-X of the U.S. Securities and Exchange Commission, and include the accounts of Vocera and its wholly owned subsidiaries. All intercompany balances and transactions have been eliminated. Certain information and disclosures normally included in financial statements prepared in accordance with U.S. GAAP have been condensed or omitted pursuant to such rules and regulations. Accordingly, these unaudited interim condensed consolidated financial statements should be read in conjunction with the annual audited consolidated financial statements and notes thereto contained in the Company's Annual Report on Form 10-K for the year ended December 31, 2015 . The year-end condensed balance sheet data was derived from the Company's audited financial statements, but does not include all disclosures required by U.S. GAAP. In the opinion of management, the accompanying unaudited condensed consolidated financial statements reflect all adjustments, which include only normal recurring adjustments, necessary to present fairly the Company’s interim consolidated financial information. The results for the quarter presented are not necessarily indicative of the results to be expected for the year ending December 31, 2016 or for any other interim period or any other future year.
Use of Estimates	Use of Estimates The preparation of the accompanying unaudited condensed consolidated financial statements in conformity with U.S. 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, useful lives assigned to long-lived assets, excess and obsolete inventory charges, warranty 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.
Revenue Recognition	Revenue Recognition The Company derives revenue from the sales of communication badges, perpetual software licenses for software that is essential to the functionality of the communication badges, smartphones, 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 and certain hosted software subscriptions. The Company's revenue recognition policy has not changed from that described in its Annual Report on Form 10-K for the year ended December 31, 2015 .
Lease, Policy	Transfer of sales-type leases to third-parties 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.
Recent Accounting Pronouncements	Recent Accounting Pronouncements In May 2014, the Financial Accounting Standards Board (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. In July 2015 the FASB affirmed a one-year deferral of the effective date of the new revenue standard. The Company’s effective date for this standard will be the first quarter of 2018. Early adoption is permitted but not before the original effective date of annual reporting periods beginning after December 15, 2016. 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, 2018. 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. In November 2015, the FASB issued new guidance to eliminate the requirement for companies to separate deferred income tax liabilities and assets into current and noncurrent amounts on the balance sheet. Instead, companies will be required to classify all deferred tax liabilities and assets as noncurrent. The Company has elected to early adopt this new guidance during the fourth quarter of fiscal year 2015 on a prospective basis as permitted under the standard, which did not result in a material change to the Company's financial statements. Prior periods were not retrospectively adjusted. In February 2016, the FASB amended lease accounting requirements to begin recording assets and liabilities arising from leases on the balance sheet. The new guidance will also require significant additional disclosures about the amount, timing and uncertainty of cash flows from leases. This new guidance will be effective for us beginning on January 1, 2019 using a modified retrospective approach. The modified retrospective approach includes a number of optional practical expedients that entities may elect to apply. 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. In March 2016, the FASB issued new guidance related to accounting for stock-based payment award transactions. The guidance is designed to simplify several aspects of accounting for share-based payment award transactions, including the income tax consequences, classification of awards as either equity or liabilities, classification on the statement of cash flows and forfeiture rate calculations. The guidance is effective for financial statements issued for fiscal years beginning after December 15, 2017, with early adoption permitted. The Company is evaluating the impact of this new guidance on the consolidated financial statements and the related disclosures.
Fair Value of Fin. Instruments, Policy	Fair Value of Financial Instruments The Company’s cash, cash equivalents and short-term investments are carried at their fair values with any differences from their amortized cost recorded in equity as unrealized gains (losses) on marketable securities. As a basis for determining the fair value of its assets and liabilities, the Company follows 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 three months ended March 31, 2016 , 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.
Goodwill, Policy	Goodwill As of March 31, 2016 and December 31, 2015 , the Company had $10.0 million and $10.0 million of goodwill, respectively, allocated to the Company's Product operating segment. As of March 31, 2016 , there were no changes in circumstances indicating that the carrying values of goodwill or acquired intangibles may not be recoverable.
Intangible Assets, Policy	Intangible Assets Acquisition-related intangible assets are amortized either straight-line, or over the life of the assets on a basis that resembles the economic benefit of the assets. This yields amortization in the latter case that is higher in earlier periods of the useful life.
Purchase commitments	Non-cancelable Material Commitments The Company is required to purchase unused, non-cancelable, non-returnable raw material inventory that was purchased by its contract manufacturers based on committed finished goods orders from the Company, certain long lead-time raw materials based on the Company’s forecast and current work-in-progress materials. As of March 31, 2016 and December 31, 2015 , approximately $7.1 million and $7.8 million , respectively, of such inventory was purchased and held by the third-party manufacturers which was subject to these purchase guarantees.
Operating leases	Leases The Company leases office space for its headquarters and subsidiaries under non-cancelable operating leases, which will expire between December 2016 and March 2022. The Company recognizes rent expense on a straight-line basis over the lease period, and has accrued for rent expense incurred but not paid. Facilities rent expense was $0.6 million and $0.5 million for the three months ended March 31, 2016 and 2015 , respectively.
Segment Reporting, Policy	The Company has two operating segments, which are both reportable business segments: (i) Product and (ii) Service, both of which are comprised of Vocera’s and its wholly-owned subsidiaries’ results of operations.

Fair Value of Financial Insturm

Fair Value of Financial Insturments (Tables)	3 Months Ended
	Mar. 31, 2016
Fair Value Disclosures [Abstract]
Assets and Liabilities Measured at Fair Value on a Recurring Basis	The Company’s assets that are measured at fair value on a recurring basis, by level, within the fair value hierarchy as of March 31, 2016 and December 31, 2015 , are summarized as follows (in thousands): March 31, 2016 December 31, 2015 Level 1 Level 2 Total Level 1 Level 2 Total Assets Money market funds $ 3,087 $ — $ 3,087 $ 7,532 $ — $ 7,532 Commercial paper 1,300 1,798 3,098 — — — U.S. government agency securities 100 11,901 12,001 — 13,009 13,009 U.S. Treasury securities — 7,365 7,365 — 5,843 5,843 Municipal debt securities — — — — — — Corporate debt securities 2,920 76,765 79,685 1,152 77,350 78,502 Total assets measured at fair value $ 7,407 $ 97,829 $ 105,236 $ 8,684 $ 96,202 $ 104,886

Cash, Cash Equivalents and Sh19

Cash, Cash Equivalents and Short-term Investments (Tables)	3 Months Ended
	Mar. 31, 2016
Cash and Cash Equivalents [Abstract]
Schedule of Cash, Cash Equivalents and Available-For-Sale Investments	The following tables present current and prior-year-end balances for cash, cash equivalents and short-term investments (in thousands): As of March 31, 2016 Amortized Cost Unrealized Gains Unrealized Losses Fair value Cash and cash equivalents: Demand deposits and other cash $ 14,993 $ — $ — $ 14,993 Money market funds 3,087 — — 3,087 Commercial paper 1,300 — — 1,300 U.S. government agency securities 100 — — 100 Corporate debt securities 2,920 — — 2,920 Total cash and cash equivalents 22,400 — — 22,400 Short-Term Investments: Commercial paper 1,798 — — 1,798 U.S. government agency securities 11,896 6 (1 ) 11,901 U.S. Treasury securities 7,359 6 — 7,365 Corporate debt securities 76,766 33 (34 ) 76,765 Total short-term investments 97,819 45 (35 ) 97,829 Total cash, cash equivalents and short-term investments $ 120,219 $ 45 $ (35 ) $ 120,229 As of December 31, 2015 Amortized Cost Unrealized Gains Unrealized Losses Fair value Cash and cash equivalents: Demand deposits and other cash $ 11,888 $ — $ — $ 11,888 Money market funds 7,532 — — 7,532 Corporate debt securities 1,152 — — 1,152 Total cash and cash equivalents 20,572 — — 20,572 Short-Term Investments: U.S. government agency securities 13,038 — (29 ) 13,009 U.S. Treasury securities 5,855 — (12 ) 5,843 Corporate debt securities 77,471 4 (125 ) 77,350 Total short-term investments 96,364 4 (166 ) 96,202 Total cash, cash equivalents and short-term investments $ 116,936 $ 4 $ (166 ) $ 116,774
Investments Classified by Contractual Maturity Date	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 March 31, 2016 Cash and cash equivalents (1) $ 22,400 $ — $ 22,400 Short-term investments 84,417 13,412 97,829 Cash, cash equivalents and short-term investments $ 106,817 $ 13,412 $ 120,229 Balances as of December 31, 2015 Cash and cash equivalents (1) $ 20,572 $ — $ 20,572 Short-term investments 75,725 20,477 96,202 Cash, cash equivalents and short-term investments $ 96,297 $ 20,477 $ 116,774 (1) Includes demand deposits and other cash, money market funds and other cash equivalent securities, all with 0-90 day maturity at purchase.

Net Loss Per Share (Tables)

Net Loss Per Share (Tables)	3 Months Ended
	Mar. 31, 2016
Earnings Per Share [Abstract]
Schedule of the computation of basic and diluted net income (loss) per share	The following table sets forth the computation of basic and diluted net loss per share (in thousands, except per share amounts): Three months ended March 31, 2016 2015 Numerator: Net loss $ (3,584 ) $ (4,487 ) Denominator: Weighted-average shares used to compute net loss per common share - basic and diluted 26,379 25,667 Net loss per share Basic and diluted $ (0.14 ) $ (0.17 )
Schedule of antidilutive securities excluded from computation of earnings per share	The following securities were not included in the calculation of diluted shares outstanding as the effect would have been anti-dilutive: Three months ended March 31, (in thousands) 2016 2015 Options to purchase common stock, including ESPP 3,125 3,440 Common stock subject to repurchase — 1 Warrants to purchase common stock — 44 Restricted stock units 1,371 1,064

Goodwill and Intangible Assets

Goodwill and Intangible Assets (Tables)	3 Months Ended
	Mar. 31, 2016
Goodwill and Intangible Assets Disclosure [Abstract]
Schedule of Finite-Lived Intangible Assets	The estimated useful lives and carrying value of acquired intangible assets are as follows: March 31, 2016 December 31, 2015 (in thousands) Range of Useful Life (years) Gross Carrying Amount Accumulated Amortization Net Carrying Amount Gross Carrying Amount Accumulated Amortization Net Carrying Amount Developed technology 4 to 7 $ 3,650 $ 2,194 $ 1,456 $ 3,650 $ 2,094 $ 1,556 Customer relationships 7 to 9 2,520 1,976 544 2,520 1,934 586 Non-compete agreements 2 to 4 460 299 161 460 258 202 Trademarks 4 to 7 110 82 28 110 79 31 Intangible assets, net book value $ 6,740 $ 4,551 $ 2,189 $ 6,740 $ 4,365 $ 2,375
Schedule of Finite-Lived Intangible Assets, Future Amortization Expense	Amortization of acquired intangible assets is reflected in the cost of revenue or operating expenses, depending on the nature of the intangible. The estimated future amortization of existing acquired intangible assets as of March 31, 2016 was as follows: (in thousands) Future amortization 2016 (nine months remaining) $ 533 2017 551 2018 441 2019 386 2020 201 2021 77 Future amortization expense $ 2,189

Balance Sheet Components (Table

Balance Sheet Components (Tables)	3 Months Ended
	Mar. 31, 2016
Balance Sheet Components [Abstract]
Inventories	Inventories (in thousands) March 31, December 31, Raw materials $ 86 $ 36 Finished goods 3,527 2,677 Total inventories $ 3,613 $ 2,713
Property and Equipment	Property and equipment, net (in thousands) March 31, December 31, Computer equipment and software $ 9,889 $ 9,446 Furniture, fixtures and equipment 1,027 1,004 Leasehold improvements 2,450 2,435 Manufacturing tools and equipment 3,263 3,134 Construction in process 941 229 Property and equipment, at cost 17,570 16,248 Less: Accumulated depreciation (13,047 ) (12,628 ) Property and equipment, net $ 4,523 $ 3,620 Depreciation and amortization expense was $0.5 million and $0.7 million for the three months ended March 31, 2016 and 2015 , respectively.
Schedule of Components of Leveraged Lease Investments	Net investment in sales-type leases The Company has sales-type leases with terms of 0.50 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: (in thousands) March 31, December 31, Minimum payments to be received on sales-type leases $ 3,731 $ 2,772 Less: Unearned interest income and executory costs (1,754 ) (1,292 ) Net investment in sales-type leases 1,977 1,480 Less: Current portion (1,007 ) (832 ) Non-current net investment in sales-type leases $ 970 $ 648 There were no allowances for doubtful accounts on these leases as of March 31, 2016 and December 31, 2015 . There is no guaranteed or unguaranteed residual value on the leased equipment. The current and non-current net investments in sales-type leases are reported as components of the consolidated balance sheet captions "other receivables" and "other long-term assets," respectively.
Schedule of Future Minimum Lease Payments for Capital Leases	The minimum payments expected to be received for future years under sales-type leases as of March 31, 2016 were as follows: (in thousands) Future lease payments 2016 (Remaining nine months) $ 1,137 2017 1,159 2018 869 2019 508 2020 58 Total $ 3,731
Accrued Liabilities	Accrued payroll and other current liabilities (in thousands) March 31, December 31, Payroll and related expenses $ 5,625 $ 8,162 Accrued payables 1,975 1,835 Deferred rent, current portion 364 326 Lease financing, current portion 742 706 Product warranty 584 701 Customer prepayments 915 941 Sales and use tax payable 270 285 Other 312 383 Total accrued payroll and other current liabilities $ 10,787 $ 13,339
Schedule of Product Warranty Liability	The changes in the Company's product warranty reserve are as follows: Three months ended March 31, (in thousands) 2016 2015 Warranty balance at the beginning of the period $ 806 $ 497 Warranty expense accrued for shipments during the period 172 64 Changes in estimate related to pre-existing warranties (201 ) 358 Warranty settlements made (157 ) (85 ) Total product warranty $ 620 $ 834 Less: Long-term portion (36 ) $ — Current portion of warranty balance at the end of the period $ 584 $ 834

Commitments and Contingencies (

Commitments and Contingencies (Tables)	3 Months Ended
	Mar. 31, 2016
Commitments and Contingencies Disclosure [Abstract]
Schedule of Future Minimum Rental Payments for Operating Leases	Future minimum lease payments at March 31, 2016 under non-cancelable operating leases are as follows: (in thousands) Operating leases 2016 (remaining nine months) $ 1,471 2017 1,911 2018 1,727 2019 1,601 2020 1,549 2021 1,595 Thereafter 402 Total minimum lease payments $ 10,256

Stock-based Compensation and 24

Stock-based Compensation and Awards (Tables)	3 Months Ended
	Mar. 31, 2016
Disclosure of Compensation Related Costs, Share-based Payments [Abstract]
Rollforward of stock option activity	A summary of the stock option activity for the three months ended March 31, 2016 is presented below: Options outstanding Number of Options Weighted Average Exercise Price Weighted average remaining contractual term Aggregate intrinsic value (in years) (in thousands) Outstanding at December 31, 2015 3,151,680 $ 9.47 5.50 $ 14,587 Options granted — Options exercised (80,239 ) 5.06 Options canceled (2,734 ) 18.26 Outstanding at March 31, 2016 3,068,707 $ 9.57 5.29 $ 15,019
Stock option valuation assumptions	The following assumptions were used for each respective period for employee stock options: Three months ended March 31, 2015 Expected Term (in years) 5.39 Volatility 41.8% Risk-free interest rate 1.63% Dividend yield 0%
Equity B-S-M Valuation Assumptions	The following Black-Scholes option-pricing assumptions were used for each respective period for the ESPP: Three months ended March 31, 2016 2015 Expected Term (in years) 0.50 0.50 Volatility 41.5% 57.8% Risk-free interest rate 0.33% 0.07% Dividend yield 0% 0%
Rollforward of RSA and RSU activty	A summary of RSU activity for the three months ended March 31, 2016 is presented below: Restricted Stock Units Number of shares Weighted Average Grant Date Fair Value per Share Outstanding at December 31, 2015 1,351,728 $ 11.54 Granted 128,528 14.32 Vested (62,209 ) 15.14 Forfeited (46,647 ) 12.12 Outstanding at March 31, 2016 1,371,400 $ 11.62
Allocation of Recognized Period Costs	The following table presents the stock-based compensation allocation of expense: Three months ended March 31, (in thousands) 2016 2015 Cost of revenue $ 269 $ 309 Research and development 226 260 Sales and marketing 1,010 1,034 General and administrative 1,041 991 Total stock-based compensation $ 2,546 $ 2,594

Segments Segments (Tables)

Segments Segments (Tables)	3 Months Ended
	Mar. 31, 2016
Segment Reporting [Abstract]
Segments	The following table presents a summary of the operating segments: Three months ended March 31, (in thousands) 2016 2015 Revenue Product $ 13,802 $ 12,462 Service 12,975 11,356 Total revenue 26,777 23,818 Cost of Revenue Product 4,449 4,432 Service 5,650 4,851 Total cost of revenue 10,099 9,283 Gross profit Product 9,353 8,030 Service 7,325 6,505 Total gross profit 16,678 14,535 Operating expenses 20,334 18,897 Interest (expense) income, net and other 164 (22 ) Loss before income taxes $ (3,492 ) $ (4,384 )

The Company and Summary of Si26

The Company and Summary of Significant Accounting Policies Narrative (Details) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2016	Mar. 31, 2015	Dec. 31, 2015
Accounting Policies [Abstract]
sales type capital leases transfered to banks	$ 300	$ 500
Initial financing liability during period incurred for future executory services on transfered leases	400	$ 200
Net Investment in Sales Type Leases	$ 1,977		$ 1,480

Fair Value of Financial Instr27

Fair Value of Financial Instruments (Details) - USD ($)	3 Months Ended
	Mar. 31, 2016	Dec. 31, 2015
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Fair Value, Assets, Level 2 to Level 1 Transfers, Amount	$ 0
Fair Value, Assets, Level 1 to Level 2 Transfers, Amount	0
Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset Transfers Into Level 3	0
Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset, Transfers out of Level 3	0
Assets, Fair Value Disclosure [Abstract]
Cash and Cash Equivalents, Fair Value Disclosure	22,400,000	$ 20,572,000
AFS Securities, Fair Value Disclosure	97,829,000	96,202,000
Fair Value, Measurements, Recurring
Assets, Fair Value Disclosure [Abstract]
Total assets measured at fair value	105,236,000	104,886,000
Fair Value, Measurements, Recurring | Level 1
Assets, Fair Value Disclosure [Abstract]
Total assets measured at fair value	7,407,000	8,684,000
Fair Value, Measurements, Recurring | Level 2
Assets, Fair Value Disclosure [Abstract]
Total assets measured at fair value	97,829,000	96,202,000
Fair Value, Measurements, Recurring | Money market funds
Assets, Fair Value Disclosure [Abstract]
Cash and Cash Equivalents, Fair Value Disclosure	3,087,000	7,532,000
Fair Value, Measurements, Recurring | Money market funds | Level 1
Assets, Fair Value Disclosure [Abstract]
Cash and Cash Equivalents, Fair Value Disclosure	3,087,000	7,532,000
Fair Value, Measurements, Recurring | Money market funds | Level 2
Assets, Fair Value Disclosure [Abstract]
Cash and Cash Equivalents, Fair Value Disclosure	0	0
Fair Value, Measurements, Recurring | Commercial paper
Assets, Fair Value Disclosure [Abstract]
AFS Securities, Fair Value Disclosure	3,098,000	0
Fair Value, Measurements, Recurring | Commercial paper | Level 1
Assets, Fair Value Disclosure [Abstract]
AFS Securities, Fair Value Disclosure	1,300,000	0
Fair Value, Measurements, Recurring | Commercial paper | Level 2
Assets, Fair Value Disclosure [Abstract]
AFS Securities, Fair Value Disclosure	1,798,000	0
Fair Value, Measurements, Recurring | U.S. government agency securities
Assets, Fair Value Disclosure [Abstract]
AFS Securities, Fair Value Disclosure	12,001,000	13,009,000
Fair Value, Measurements, Recurring | U.S. government agency securities | Level 1
Assets, Fair Value Disclosure [Abstract]
AFS Securities, Fair Value Disclosure	100,000	0
Fair Value, Measurements, Recurring | U.S. government agency securities | Level 2
Assets, Fair Value Disclosure [Abstract]
AFS Securities, Fair Value Disclosure	11,901,000	13,009,000
Fair Value, Measurements, Recurring | U.S. Treasury securities
Assets, Fair Value Disclosure [Abstract]
AFS Securities, Fair Value Disclosure	7,365,000	5,843,000
Fair Value, Measurements, Recurring | U.S. Treasury securities | Level 1
Assets, Fair Value Disclosure [Abstract]
AFS Securities, Fair Value Disclosure	0	0
Fair Value, Measurements, Recurring | U.S. Treasury securities | Level 2
Assets, Fair Value Disclosure [Abstract]
AFS Securities, Fair Value Disclosure	7,365,000	5,843,000
Fair Value, Measurements, Recurring | Municipal debt securities
Assets, Fair Value Disclosure [Abstract]
AFS Securities, Fair Value Disclosure	0	0
Fair Value, Measurements, Recurring | Municipal debt securities | Level 1
Assets, Fair Value Disclosure [Abstract]
AFS Securities, Fair Value Disclosure	0	0
Fair Value, Measurements, Recurring | Municipal debt securities | Level 2
Assets, Fair Value Disclosure [Abstract]
AFS Securities, Fair Value Disclosure	0	0
Fair Value, Measurements, Recurring | Corporate debt securities
Assets, Fair Value Disclosure [Abstract]
AFS Securities, Fair Value Disclosure	79,685,000	78,502,000
Fair Value, Measurements, Recurring | Corporate debt securities | Level 1
Assets, Fair Value Disclosure [Abstract]
AFS Securities, Fair Value Disclosure	2,920,000	1,152,000
Fair Value, Measurements, Recurring | Corporate debt securities | Level 2
Assets, Fair Value Disclosure [Abstract]
AFS Securities, Fair Value Disclosure	$ 76,765,000	$ 77,350,000

Schedule of Available for Sale

Schedule of Available for Sale Securities (Details) - USD ($) $ in Thousands	Mar. 31, 2016	Dec. 31, 2015
Cash and cash equivalents [Abstract]
Cash and Cash Equivalents, Amortized Cost	$ 22,400	$ 20,572
Cash And Cash Equivalents, Gross Unrealized Gains	0	0
Cash And Cash Equivalents, Gross Unrealized Losses	0	0
Cash and Cash Equivalents, Fair Value Disclosure	22,400	20,572
Short-term Investments [Abstract]
AFS Securities, Amortized Cost Basis	97,819	96,364
Available-for-sale Securities, Gross Unrealized Gain1	45	4
Available-for-sale Securities, Gross Unrealized Loss1	(35)	(166)
AFS Securities, Fair Value Disclosure	97,829	96,202
Cash, Cash Equivalents, and Short-term Investments [Abstract]
Cash, Cash Equiv. And S-T Investments, Amortized Cost	120,219	116,936
Cash, Cash Equiv. And S-T Investments, Gross Unrealized Gains	45	4
Cash, Cash Equiv. And S-T Investments, Gross Unrealized Losses	(35)	(166)
Cash, Cash Equiv. And S-T Investments, Fair Value Disclosure	120,229	116,774
Demand deposits and other cash
Cash and cash equivalents [Abstract]
Cash and Cash Equivalents, Amortized Cost	14,993	11,888
Cash And Cash Equivalents, Gross Unrealized Gains	0	0
Cash And Cash Equivalents, Gross Unrealized Losses	0	0
Cash and Cash Equivalents, Fair Value Disclosure	14,993	11,888
Money market funds
Cash and cash equivalents [Abstract]
Cash and Cash Equivalents, Amortized Cost	3,087	7,532
Cash And Cash Equivalents, Gross Unrealized Gains	0	0
Cash And Cash Equivalents, Gross Unrealized Losses	0	0
Cash and Cash Equivalents, Fair Value Disclosure	3,087	7,532
Corporate Debt Securities
Cash and cash equivalents [Abstract]
Cash and Cash Equivalents, Amortized Cost		1,152
Cash And Cash Equivalents, Gross Unrealized Gains		0
Cash And Cash Equivalents, Gross Unrealized Losses		0
Cash and Cash Equivalents, Fair Value Disclosure		1,152
U.S. government agency securities
Short-term Investments [Abstract]
AFS Securities, Amortized Cost Basis	11,896	13,038
Available-for-sale Securities, Gross Unrealized Gain1	6	0
Available-for-sale Securities, Gross Unrealized Loss1	(1)	(29)
AFS Securities, Fair Value Disclosure	11,901	13,009
U.S. Treasury securities
Short-term Investments [Abstract]
AFS Securities, Amortized Cost Basis	7,359	5,855
Available-for-sale Securities, Gross Unrealized Gain1	6	0
Available-for-sale Securities, Gross Unrealized Loss1	0	(12)
AFS Securities, Fair Value Disclosure	7,365	5,843
Corporate Debt Securities
Short-term Investments [Abstract]
AFS Securities, Amortized Cost Basis	76,766	77,471
Available-for-sale Securities, Gross Unrealized Gain1	33	4
Available-for-sale Securities, Gross Unrealized Loss1	(34)	(125)
AFS Securities, Fair Value Disclosure	$ 76,765	$ 77,350

Contractual maturities of cash,

Contractual maturities of cash, cash equivalent and short-term investment (Details) - USD ($) $ in Thousands	Mar. 31, 2016	Dec. 31, 2015
Schedule of Available-for-sale Securities [Line Items]
Cash and cash equivalents (1)	$ 22,400	$ 20,572
Short-term investments	97,829	96,202
Cash, cash equivalents and short-term investments	120,229	116,774
Maturity up to one year
Schedule of Available-for-sale Securities [Line Items]
Cash and cash equivalents (1)	22,400	20,572
Short-term investments	84,417	75,725
Cash, cash equivalents and short-term investments	106,817	96,297
maturity between 1 and 2 years
Schedule of Available-for-sale Securities [Line Items]
Cash and cash equivalents (1)	0	0
Short-term investments	13,412	20,477
Cash, cash equivalents and short-term investments	$ 13,412	$ 20,477

Schedule of the computation of

Schedule of the computation of basic and diluted net income (loss) per share (Details) - USD ($) $ / shares in Units, shares in Thousands, $ in Thousands	3 Months Ended
	Mar. 31, 2016	Mar. 31, 2015
Numerator:
Net loss	$ (3,584)	$ (4,487)
Denominator:
Weighted Average Number of Shares Outstanding, Basic and Diluted	26,379	25,667
Net loss per share
Earnings Per Share, Basic and Diluted	$ (0.14)	$ (0.17)

Schedule of antidilutive securi

Schedule of antidilutive securities excluded from computation of earnings per share (Details) - shares shares in Thousands	3 Months Ended
	Mar. 31, 2016	Mar. 31, 2015
Options to purchase common stock, including ESPP
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items]
Antidilutive Securities Excluded from Computation of Earnings Per Share, Amount	3,125	3,440
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	0	1
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	0	44
Restricted stock units
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items]
Antidilutive Securities Excluded from Computation of Earnings Per Share, Amount	1,371	1,064

Schedule of Finite-Lived Intang

Schedule of Finite-Lived Intangible Assets (Details) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2016	Dec. 31, 2015
Finite-Lived Intangible Assets [Line Items]
Accumulated Amortization	$ 4,551	$ 4,365
Finite-Lived Intangible Assets, Net	2,189
Finite-Lived Intangible Assets, Useful Life
Intangible assets, gross	6,740	6,740
Intangible assets, net book value	2,189	2,375
Developed technology
Finite-Lived Intangible Assets [Line Items]
Gross Carrying Amount	3,650	3,650
Accumulated Amortization	2,194	2,094
Finite-Lived Intangible Assets, Net	1,456	1,556
Customer relationships
Finite-Lived Intangible Assets [Line Items]
Gross Carrying Amount	2,520	2,520
Accumulated Amortization	1,976	1,934
Finite-Lived Intangible Assets, Net	544	586
Noncompete Agreements
Finite-Lived Intangible Assets [Line Items]
Gross Carrying Amount	460	460
Accumulated Amortization	299	258
Finite-Lived Intangible Assets, Net	161	202
Trademarks
Finite-Lived Intangible Assets [Line Items]
Gross Carrying Amount	110	110
Accumulated Amortization	82	79
Finite-Lived Intangible Assets, Net	$ 28	$ 31
Minimum | Developed technology
Finite-Lived Intangible Assets, Useful Life
Finite-lived intangible asset, useful life	4 years
Minimum | Customer relationships
Finite-Lived Intangible Assets, Useful Life
Finite-lived intangible asset, useful life	7 years
Minimum | Noncompete Agreements
Finite-Lived Intangible Assets, Useful Life
Finite-lived intangible asset, useful life	2 years
Minimum | Trademarks
Finite-Lived Intangible Assets, Useful Life
Finite-lived intangible asset, useful life	4 years
Maximum | Developed technology
Finite-Lived Intangible Assets, Useful Life
Finite-lived intangible asset, useful life	7 years
Maximum | Customer relationships
Finite-Lived Intangible Assets, Useful Life
Finite-lived intangible asset, useful life	9 years
Maximum | Noncompete Agreements
Finite-Lived Intangible Assets, Useful Life
Finite-lived intangible asset, useful life	4 years
Maximum | Trademarks
Finite-Lived Intangible Assets, Useful Life
Finite-lived intangible asset, useful life	7 years

Future amortization schedule (D

Future amortization schedule (Details) $ in Thousands	Mar. 31, 2016USD ($)
Goodwill and intangible assets [Abstract]
Finite-Lived Intangibles, AmortExp Remainder 2016	$ 533
Finite-Lived Intangible Assets, Amortization Expense, 2017	551
Finite-Lived Intangibles, AmortExp, 2018	441
Finite-Lived Intangibles, AmortExp, 2019	386
Finite-Lived Intangibles, AmortExp, 2020	201
Finite-Lived Intangibles, AmortExp, 2021	77
Finite-Lived Intangible Assets, Net	$ 2,189

Goodwill and Intangible Asset34

Goodwill and Intangible Assets Narrative (Details) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2016	Mar. 31, 2015	Dec. 31, 2015
Finite-Lived Intangible Assets [Line Items]
Goodwill	$ 9,988		$ 9,988
Intangibles - period amortization expense [Abstract]
Amortization expense	$ 200	$ 200

Inventories (Details)

Inventories (Details) - USD ($) $ in Thousands	Mar. 31, 2016	Dec. 31, 2015
Inventory, Net [Abstract]
Raw materials	$ 86	$ 36
Finished goods	3,527	2,677
Total inventories	$ 3,613	$ 2,713

Property and Equipment (Details

Property and Equipment (Details) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2016	Mar. 31, 2015	Dec. 31, 2015
Property, Plant and Equipment [Line Items]
Property, Plant and Equipment, Gross	$ 17,570		$ 16,248
Less: Accumulated depreciation	(13,047)		(12,628)
Property and equipment, net	4,523		3,620
Depreciation, Depletion and Amortization [Abstract]
Depreciation	500	$ 700
Computer equipment and software
Property, Plant and Equipment [Line Items]
Property, Plant and Equipment, Gross	9,889		9,446
Furniture, fixtures and equipment
Property, Plant and Equipment [Line Items]
Property, Plant and Equipment, Gross	1,027		1,004
Leasehold improvements
Property, Plant and Equipment [Line Items]
Property, Plant and Equipment, Gross	2,450		2,435
Manufacturing tools and equipment
Property, Plant and Equipment [Line Items]
Property, Plant and Equipment, Gross	3,263		3,134
Construction in process
Property, Plant and Equipment [Line Items]
Property, Plant and Equipment, Gross	$ 941		$ 229

Investment in Sales Type Leases

Investment in Sales Type Leases (Details) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2016	Dec. 31, 2015
Capital Leased Assets [Line Items]
Net Investment in Sales Type Leases, Future Minimum Payments-Gross	$ 3,731	$ 2,772
Net Investment in Sales Type Leases, Deferred Income	(1,754)	(1,292)
Net Investment in Sales Type Leases	1,977	1,480
Net Investment in Sales Type Leases, Current	(1,007)	(832)
Net Investment in Sales Type Leases, Noncurrent	$ 970	$ 648
Minimum
Capital Leased Assets [Line Items]
Lessors, Capital Leases, Term of contract	6 months
Maximum
Capital Leased Assets [Line Items]
Lessors, Capital Leases, Term of contract	4 years

Future payments- sales type lea

Future payments- sales type leases (Details) - USD ($) $ in Thousands	Mar. 31, 2016	Dec. 31, 2015
Balance Sheet Components [Abstract]
Sales-type Leases, Future Minimum Payments, Remainder of 2016	$ 1,137
Capital Leases, Future Minimum Payments Due in 2017	1,159
Sales-type Leases, Future Minimum Payments Due in 2018	869
Capital Leases, Future Minimum Payments Due in 2019	508
Capital Leases, Future Minimum Payments Due in 2020	58
Capital Leases, Future Minimum Payments Due Thereafter	0
Net Investment in Sales Type Leases, Future Minimum Payments-Gross	$ 3,731	$ 2,772

Accrued Liabilities (Details)

Accrued Liabilities (Details) - USD ($) $ in Thousands	Mar. 31, 2016	Dec. 31, 2015
Accrued Liabilities, Current [Abstract]
Payroll and related expenses	$ 5,625	$ 8,162
Accrued payables	1,975	1,835
Deferred Rent Credit, Current	364	326
Lease financing, current portion	742	706
Product warranty	584	701
Customer Refund Liability, Current	915	941
Sales and use tax payable	270	285
Other	312	383
Total accrued payroll and other current liabilities	$ 10,787	$ 13,339

Schedule of Product Liability (

Schedule of Product Liability (Details) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2016	Mar. 31, 2015
Movement in Standard and Extended Product Warranty, Increase (Decrease) [Roll Forward]
Product warranty accrual, at the beginning of the period	$ 806	$ 497
Warranty expenses accrued	172	64
Product Warranty Accrual, Preexisting, Increase (Decrease)	(201)	358
Warranty settlements made	(157)	(85)
Product warranty accrual, at the end of period	584	834
Product Warranty Accrual	620	834
Product Warranty Accrual, Noncurrent	$ (36)	$ 0

Schedule of Future Minimum Rent

Schedule of Future Minimum Rental Payments for Operating Leases (Details) $ in Thousands	Mar. 31, 2016USD ($)
Operating Leases, Future Minimum Payments Due, by FY
Remainder of 2016	$ 1,471
Operating Leases, Future Minimum Payments, 2017	1,911
Operating Leases, Future Minimum Payments, 2018	1,727
Operating Leases, Future Minimum Payments, 2019	1,601
Operating Leases, Future Minimum Payments, 2020	1,549
Operating Leases, Future Minimum Payments, 2021	1,595
Operating Leases, Future Minimum Payments, Due Thereafter	402
Total minimum lease payments	$ 10,256

Litigation_ alleged shareholder

Litigation: alleged shareholder class action (Details)	3 Months Ended
	Mar. 31, 2016
Loss Contingencies [Line Items]
Loss Contingency, Settlement Agreement, Terms	9,000,000

Commitments Narrative (Details)

Commitments Narrative (Details) - USD ($) $ in Millions	3 Months Ended
	Mar. 31, 2016	Mar. 31, 2015	Dec. 31, 2015
Unrecorded Unconditional Purchase Obligation [Line Items]
Operating Leases, Rent Expense, Net	$ 0.6	$ 0.5
Inventories
Unrecorded Unconditional Purchase Obligation [Line Items]
Unrecorded Unconditional Purchase Obligation	$ 7.1		$ 7.8

Stock Option Activity (Details)

Stock Option Activity (Details) - Stock Options - USD ($) $ / shares in Units, $ in Thousands	3 Months Ended	12 Months Ended
	Mar. 31, 2016	Dec. 31, 2015
Number of Options (in shares):
Beginning balance	3,151,680
Options granted	0
Options exercised	(80,239)
Options canceled	(2,734)
Ending balance	3,068,707	3,151,680
Weighted Average Exercise Price (in dollars per share):
Beginning balance	$ 9.47
Options granted
Options exercised	$ 5.06
Options canceled	18.26
Ending balance	$ 9.57	$ 9.47
Wtd avg remaining term, Outstanding	5 years 3 months 15 days	5 years 6 months
Aggregate intrinsic value, Outstanding	$ 15,019	$ 14,587

Summary of Equity B-S-M Assumpt

Summary of Equity B-S-M Assumptiuons (Details)	3 Months Ended		12 Months Ended
	Mar. 31, 2016	Mar. 31, 2015	Dec. 31, 2015	Dec. 31, 2014
Equity Option
Equity B-S-M Fair Value Assumptions
Expected Term (in years)		5 years 4 months 19 days
Volatility		41.80%
Interest Rate		1.63%
Dividend yield		0.00%
Equity Option | Minimum
Equity B-S-M Fair Value Assumptions
Expected Term (in years)
Volatility
Interest Rate
Equity Option | Maximum
Equity B-S-M Fair Value Assumptions
Expected Term (in years)
Volatility
Interest Rate
2012 Employee Stock Purchase Plan | ESPP
Equity B-S-M Fair Value Assumptions
Expected Term (in years)	6 months	6 months
Volatility	41.50%	57.80%
Interest Rate	0.33%	0.07%
Dividend yield	0.00%	0.00%
2012 Employee Stock Purchase Plan | ESPP | Minimum
Equity B-S-M Fair Value Assumptions
Expected Term (in years)
Volatility
Interest Rate
2012 Employee Stock Purchase Plan | ESPP | Maximum
Equity B-S-M Fair Value Assumptions
Expected Term (in years)
Volatility
Interest Rate

Summary of Restricted Stock Act

Summary of Restricted Stock Activity (Details) - Restricted Stock Units	3 Months Ended
	Mar. 31, 2016$ / sharesshares
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Stock Comp-other than options - Period for Recognition- Comp cost not yet rocognized	1 year 8 months 27 days
Number of Shares:
Beginning balance | shares	1,351,728
Granted | shares	128,528
Vested | shares	(62,209)
Forfeited | shares	(46,647)
Ending balance | shares	1,371,400
Weighted Average Grant Date Fair Value per Share (in dollars per share):
Beginning balance | $ / shares	$ 11.54
Granted | $ / shares	14.32
Vested | $ / shares	15.14
Forfeited | $ / shares	12.12
Ending balance | $ / shares	$ 11.62

Share-based Compensaton Allocat

Share-based Compensaton Allocated to Expense Captions (Details) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2016	Mar. 31, 2015
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Stock-based compensation expense	$ 2,546	$ 2,594
Cost of Sales
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Stock-based compensation expense	269	309
Research and Development Expense
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Stock-based compensation expense	226	260
Selling and Marketing Expense
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Stock-based compensation expense	1,010	1,034
General and Administrative Expense
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Stock-based compensation expense	$ 1,041	$ 991
Equity Option
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Dividend yield		0.00%

Narrative (Details)

Narrative (Details) - USD ($) $ in Thousands	3 Months Ended	12 Months Ended
	Mar. 31, 2016	Dec. 31, 2014
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Proceeds from warrant exercises	$ 0	$ 0
Stock Options
Share-based Compensation Arrangement by Share-based Payment Award, Options, Additional Disclosures [Abstract]
Unamortized Compensation Cost, Stock Options	$ 3,400
Uamortized Compensation Cost Not yet Recognized, Period Remaining, Options	2 years
Restricted stock units
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Additional Disclosures [Abstract]
Employee Service Share-based Compensation, Nonvested Awards, Compensation Not yet Recognized, Share-based Awards Other than Options	$ 9,800
Stock Comp-other than options - Period for Recognition- Comp cost not yet rocognized	1 year 8 months 27 days
2012 Stock Option Plan | Stock options and restricted stock units
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Number of Shares Available for Grant	2,625,529
2012 Employee Stock Purchase Plan | ESPP
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Number of Shares Available for Grant	656,831

Segments Operating Segments (De

Segments Operating Segments (Details) $ in Thousands	3 Months Ended
	Mar. 31, 2016USD ($)Segments	Mar. 31, 2015USD ($)
Segment Reporting [Abstract]
Number of reportable segments | Segments	2
Revenue
Product	$ 13,802	$ 12,462
Service	12,975	11,356
Total revenue	26,777	23,818
Cost of revenue
Product	4,449	4,432
Service	5,650	4,851
Cost of Goods and Services Sold	10,099	9,283
Gross profit
Product	9,353	8,030
Service	7,325	6,505
Total gross profit	16,678	14,535
Calculation of pretax profit (loss) [Abstract]
Operating expenses	20,334	18,897
Interest (expense) income, net and other	164	(22)
Loss before income taxes	$ (3,492)	$ (4,384)

Income Taxes (Details)

Income Taxes (Details) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2016	Mar. 31, 2015
Income Tax Disclosure [Abstract]
Income Tax Expense (Benefit)	$ 92	$ 103

Business Acquisition - PPA (Det

Business Acquisition - PPA (Details) - USD ($) $ in Thousands	Mar. 31, 2016	Dec. 31, 2015
Business Combination, Recognized Identifiable Assets Acquired, Goodwill, and Liabilities Assumed, Net [Abstract]
Goodwill	$ 9,988	$ 9,988

Business Acquisition Narrative

Business Acquisition Narrative (Details) - Noncompete Agreements	3 Months Ended
	Mar. 31, 2016
Minimum
Business Acquisition [Line Items]
Finite-lived intangible asset, useful life	2 years
Maximum
Business Acquisition [Line Items]
Finite-lived intangible asset, useful life	4 years