ZELTIQ Aesthetics (ZLTQ) 10-Q 11 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]
Document Type	10-Q
Amendment Flag	false
Document Period End Date	Mar. 31, 2016
Document Fiscal Year Focus	2,016
Document Fiscal Period Focus	Q1
Entity Registrant Name	Zeltiq Aesthetics Inc
Entity Central Index Key	1,415,336
Current Fiscal Year End Date	--12-31
Entity Filer Category	Large Accelerated Filer
Entity Common Stock, Shares Outstanding		39,455,079

Condensed Consolidated Balance

Condensed Consolidated Balance Sheets - USD ($) $ in Thousands	Mar. 31, 2016	Dec. 31, 2015
CURRENT ASSETS:
Cash and cash equivalents	$ 33,508	$ 35,710
Short-term investments	4,663	12,867
Accounts receivable, net	32,572	33,359
Inventory	32,562	28,095
Prepaid expenses and other current assets	13,709	11,771
Total current assets	117,014	121,802
Long-term investments	857	3,490
Restricted cash	444	452
Property and equipment, net	7,511	6,969
Intangible asset, net	4,930	5,092
Long-term deferred tax assets	41,256	40,475
Other assets	473	547
Total assets	172,485	178,827
CURRENT LIABILITIES:
Accounts payable	13,554	10,903
Accrued and other current liabilities	31,326	34,691
Deferred revenue	10,637	7,682
Current portion of capital lease obligations	125	124
Total current liabilities	55,642	53,400
Long-term deferred revenue	214	226
Long-term capital lease obligations, less current portion	106	138
Other non-current liabilities	847	761
Total liabilities	$ 56,809	$ 54,525
Commitments and contingencies (Note 6)
STOCKHOLDERS’ EQUITY:
Preferred stock, $0.01 par value: 50,000,000 shares authorized and no shares issued and outstanding at March 31, 2016 and December 31, 2015	$ 0	$ 0
Common stock, $0.001 par value: 500,000,000 shares authorized at March 31, 2016, and December 31, 2015; 39,420,312 and 39,217,630 shares issued and outstanding at March 31, 2016 and December 31, 2015, respectively	43	43
Additional paid-in capital	217,208	215,621
Accumulated other comprehensive loss	(1,979)	(1,636)
Accumulated deficit	(99,596)	(89,726)
Total stockholders’ equity	115,676	124,302
Total liabilities and stockholders’ equity	$ 172,485	$ 178,827

Condensed Consolidated Balance3

Condensed Consolidated Balance Sheets (Parenthetical) - $ / shares	Mar. 31, 2016	Dec. 31, 2015
Statement of Financial Position [Abstract]
Preferred stock, par value (in dollars per share)	$ 0.01	$ 0.01
Preferred stock, shares authorized	50,000,000	50,000,000
Preferred stock, shares issued	0	0
Preferred stock, shares outstanding	0	0
Common stock, par value (in dollars per share)	$ 0.001	$ 0.001
Common stock, shares authorized	500,000,000	500,000,000
Common stock, shares issued	39,420,312	39,217,630
Common stock, shares outstanding	39,420,312	39,217,630

Condensed Consolidated Statemen

Condensed Consolidated Statements of Operations - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2016	Mar. 31, 2015
Income Statement [Abstract]
Revenue	$ 64,469	$ 51,558
Cost of revenue	18,229	14,378
Gross profit	46,240	37,180
Operating expenses:
Research and development	6,203	6,080
Sales and marketing	40,655	24,406
General and administrative	10,546	8,388
Total operating expenses	57,404	38,874
Loss from operations	(11,164)	(1,694)
Interest income (expense), net	(36)	13
Other income (expense), net	646	(420)
Loss before income taxes	(10,554)	(2,101)
Provision for (benefit from) income taxes	(684)	28
Net loss	$ (9,870)	$ (2,129)
Basic and diluted net loss per share:
Net loss per share, basic and diluted	$ (0.25)	$ (0.06)
Weighted average shares of common stock outstanding used in computing net loss per share, basic and diluted	39,288,853	38,383,022

Condensed Consolidated Stateme5

Condensed Consolidated Statements of Comprehensive Income (Loss) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2016	Mar. 31, 2015
Statement of Comprehensive Income [Abstract]
Net loss	$ (9,870)	$ (2,129)
Other comprehensive loss, net of tax:
Foreign currency translation adjustments	(365)	(588)
Changes in unrealized gains on available-for-sale securities	22	5
Other comprehensive loss, net of tax	(343)	(583)
Comprehensive loss	$ (10,213)	$ (2,712)

Condensed Consolidated Stateme6

Condensed Consolidated Statements of Cash Flows - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2016	Mar. 31, 2015
CASH FLOWS FROM OPERATING ACTIVITIES:
Net loss	$ (9,870)	$ (2,129)
Adjustments to reconcile net loss to net cash used in operating activities:
Depreciation and amortization	709	513
Stock-based compensation	4,202	4,150
Deferred income taxes	(781)	0
Amortization of investment premium, net	22	22
Provision for doubtful accounts receivable	284	123
Provision for excess and obsolete inventory	27	128
Loss on disposal and write-off of property and equipment	20	0
Changes in operating assets and liabilities:
Accounts receivable	36	(3,359)
Inventory	(4,794)	(2,100)
Prepaid expenses and other assets	(1,972)	(391)
Deferred revenue	3,076	503
Accounts payable, accrued and other liabilities	(47)	710
Net cash used in operating activities	(9,088)	(1,830)
CASH FLOWS FROM INVESTING ACTIVITIES:
Purchase of investments	(741)	(4,070)
Proceeds from sale of investments	8,683	0
Proceeds from maturity of investments	2,894	5,911
Purchase of property and equipment	(1,424)	(285)
Net cash provided by investing activities	9,412	1,556
CASH FLOWS FROM FINANCING ACTIVITIES:
Principal payments on capital leases	(31)	(29)
Proceeds from issuance of common stock upon exercise of stock options	37	1,346
Tax payments related to shares withheld for vested restricted stock units	(2,651)	(4,345)
Tax effect of employee stock plans	0	16
Net cash used in financing activities	(2,645)	(3,012)
Effect of exchange rate changes on cash and cash equivalents	119	(306)
NET DECREASE IN CASH AND CASH EQUIVALENTS	(2,202)	(3,592)
CASH AND CASH EQUIVALENTS—Beginning of period	35,710	28,649
CASH AND CASH EQUIVALENTS—End of period	$ 33,508	$ 25,057

Basis of Presentation and Summa

Basis of Presentation and Summary of Significant Accounting Policies	3 Months Ended
	Mar. 31, 2016
Organization, Consolidation and Presentation of Financial Statements [Abstract]
Basis of Presentation and Summary of Significant Accounting Policies	Basis of Presentation and Summary of Significant Accounting Policies Basis of Presentation The accompanying interim condensed consolidated financial statements of ZELTIQ Aesthetics, Inc. (the "Company") are unaudited. These interim condensed consolidated financial statements have been prepared in accordance with generally accepted accounting principles in the United States of America, or GAAP, and the applicable rules and regulations of the Securities and Exchange Commission, or SEC, for interim financial information. Accordingly, they do not include all of the information and footnotes required by GAAP for complete financial statements. The December 31, 2015 condensed consolidated balance sheet was derived from the audited financial statements as of that date, but does not include all of the information and footnotes required by GAAP for complete financial statements. The accompanying unaudited interim condensed consolidated financial statements have been prepared on the same basis as the audited consolidated financial statements and, in the opinion of management, reflect all adjustments of a normal recurring nature considered necessary to state fairly the Company's financial position as of March 31, 2016 , results of operations for the three months ended March 31, 2016 and 2015 , comprehensive loss for the three months ended March 31, 2016 and 2015 , and cash flows for the three months ended March 31, 2016 and 2015 . The interim results for the three months ended March 31, 2016 are not necessarily indicative of the results that may be expected for the year ending December 31, 2016 or for any other future annual or interim period. The information included in this Quarterly Report on Form 10-Q should be read in conjunction with “Management’s Discussion and Analysis of Financial Condition and Results of Operations," “Quantitative and Qualitative Disclosures About Market Risk” and the Consolidated Financial Statements and notes thereto included in Items 7, 7A and 8, respectively, in the Company's Annual Report on Form 10-K for the year ended December 31, 2015 . Out of period adjustments During the three months ended March 31, 2016 , the Company recorded certain out-of-period correcting adjustments totaling $0.2 million to increase cost of revenue by $0.4 million , with a corresponding increase to warranty accrual, and to reduce other operating expenses by $0.2 million , with a corresponding decrease to other accruals, relating to prior periods. The Company does not believe that such amounts are material to any prior period consolidated financial statements, and the impact of correcting these errors in the three months ended March 31, 2016 is not material to the current consolidated financial statements or expected to be material to the financial statements for the year ending December 31, 2016 . Principles of Consolidation The condensed consolidated financial statements include the accounts of the Company and its wholly-owned subsidiaries. All significant intercompany accounts and transactions have been eliminated. The functional currency of the Company’s international subsidiaries is evaluated on a case-by-case basis and has been determined to be the local currency with the exception of Malta which carries a U.S. dollar functional currency. All assets and liabilities of these foreign operations are translated to U.S. Dollars at current period end exchange rates, and revenue and expenses are translated to U.S. Dollars using average exchange rates in effect during the period. The gains and losses from the foreign currency translation of the foreign subsidiaries' financial statements are included as a separate component of stockholders' equity under "Accumulated other comprehensive income (loss)." Gains or losses arising from currency exchange rate fluctuations on transactions denominated in a currency other than the local functional currency are included in other income (expense), net. Use of Estimates The preparation of financial statements in conformity with GAAP requires management to make certain estimates and assumptions that affect the reported amounts of assets and liabilities and disclosure of contingent assets and liabilities at the date of the financial statements and the reported amounts of revenue and expenses during the reported periods. The primary estimates underlying the Company's financial statements include the value of revenue elements, product warranty, inventory valuation, allowance for doubtful accounts receivable, assumptions regarding variables used in calculating the fair value of the Company's equity awards, fair value of investments, useful lives of intangibles, income taxes and contingent liabilities. Actual results could differ from those estimates. Concentration of Credit Risk As of March 31, 2016 , no individual customer accounted for more than 10% of accounts receivable. As of December 31, 2015 , Ideal Image, which is a large aesthetic chain, along with its affiliated franchises, accounted for 10% of the Company's accounts receivable. During the three months ended March 31, 2016 , no customer accounted for more than 10% of total revenue. During the three months ended March 31, 2015 , Ideal Image accounted for 11% of total revenue. Significant Accounting Policies There have been no material changes to the Company’s significant accounting policies during the three months ended March 31, 2016 , as compared to the significant accounting policies described in the Company’s Annual Report on Form 10-K for the year ended December 31, 2015 . Recent Accounting Pronouncements On May 28, 2014 , the Financial Accounting Standards Board, or FASB, issued Accounting Standards Update No. 2014-09, Revenue from Contracts with Customers. On August 12, 2015 , the FASB issued ASU 2015-14, Revenue from Contracts with Customers (Topic 606): Deferral of the Effective Date, which delays the effective date of ASU 2014-09 by one year. In March 2016, the FASB issued ASU 2016-08 which included amendments to the guidance in the new standard on assessing whether an entity is a principal or an agent in a revenue transaction. This conclusion impacts whether an entity reports revenue on a gross or net basis. In April 2016, the FASB issued ASU 2016-10 which includes additional amendments to the guidance in the new revenue standard on identifying performance obligations and accounting for licenses of intellectual property. The objective of this update is to provide a single, comprehensive revenue recognition model for all contracts with customers to improve comparability within industries, across industries, and across capital markets. This standard update contains principles that the Company will apply to determine the measurement of revenue and timing of when it is recognized. This guidance allows for two methods of adoption: (a) full retrospective adoption, meaning the guidance is applied to all periods presented, or (b) modified retrospective adoption, meaning the cumulative effect of applying this guidance is recognized as an adjustment to the fiscal 2018 opening accumulated deficit balance. The Company expects to adopt this guidance effective January 1, 2018 , and is currently evaluating the two adoption methods as well as the impact this new guidance will have on its consolidated financial statements and related disclosures. In July 2015 , the FASB issued Accounting Standards Update No. 2015-11 to amend ASC Topic 330, Inventory ("ASC 330") to simplify the measurement of inventory. The amendments require that an entity measure inventory at the lower of cost and net realizable value instead of the lower of cost and market. This guidance is effective for public companies for years, and interim periods within those years, beginning on or after December 15, 2016, with earlier application permitted as of the beginning of an interim or annual reporting period. This guidance will be effective for the Company beginning in its first quarter of fiscal 2017. The Company is currently evaluating the impact this new guidance will have on its consolidated financial statements and related disclosures. In February 2016, the FASB issued Accounting Standards Update No. 2016-02, Leases. This ASU requires lease assets and lease liabilities arising from leases, including operating leases, to be recognized on the balance sheet. ASU 2016-02 will become effective for the Company on January 1, 2019, and requires adoption using a modified retrospective approach. The Company is currently evaluating the impact of this guidance on its consolidated financial statements and related disclosures. In March 30, 2016, the FASB issued Accounting Standards Update No. 2016-09, Improvements to Employee Share-Based Payment Accounting. This ASU will change how companies account for certain aspects of share-based payments to employees. This guidance will require all income tax effects of awards to be recognized in the income statement when the awards vest or are settled. It also will allow an employer to repurchase more of an employee's shares than it can today for tax withholding purposes without triggering liability accounting and to make a policy election to account for forfeitures as they occur. The guidance is effective for public business entities for fiscal years beginning after December 2016, and interim periods within those years, with earlier application permitted in any annual or interim period for which financial statements haven't been issued or made available for issuance, but all of the guidance must be adopted in the same period. The Company is currently evaluating the impact this new guidance will have on its consolidated financial statements and 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 Fair value is defined as the price that would be received to sell an asset or paid to transfer a liability (an exit price) in an orderly transaction between market participants at the reporting date. The accounting guidance establishes a three-tiered hierarchy, which prioritizes the inputs used in the valuation methodologies in measuring fair value: • Level 1—Quoted prices in active markets for identical assets or liabilities. • Level 2—Inputs other than Level 1 that are observable, either directly or indirectly, such as quoted prices in markets that are not active, or other inputs that are observable or can be corroborated by observable market data for substantially the full term of the assets or liabilities. • Level 3—Unobservable inputs that are supported by little or no market activity and that are significant to the fair value of the assets or liabilities. The categorization of a financial instrument within the valuation hierarchy is based on the lowest level of input that is significant to the fair value measurement. The Company classifies its cash equivalents and investments within Level 1 and Level 2, as it uses quoted market prices or alternative pricing sources and models utilizing market observable inputs. The following tables set forth the fair value of the Company’s financial assets and liabilities by level within the fair value hierarchy (in thousands): As of March 31, 2016 Level 1 Level 2 Level 3 Fair Value Financial Assets Cash equivalents: Money market funds $ 2,244 $ — $ — $ 2,244 Short-term investments: U.S. Agency securities — 750 — 750 U.S. Treasury — — — — Corporate bonds — 3,913 — 3,913 Commercial paper — — — — Certificates of deposit — — — — Long-term investments: U.S. Agency securities — — — — Corporate bonds — 612 — 612 Certificates of deposit 245 — — 245 Total $ 2,489 $ 5,275 $ — $ 7,764 As of December 31, 2015 Level 1 Level 2 Level 3 Fair Value Financial Assets Cash equivalents: Money market funds $ 1,342 $ — $ — $ 1,342 Short-term investments: U.S. Agency securities — 1,549 — 1,549 U.S. Treasury — 500 — 500 Corporate bonds — 7,763 — 7,763 Commercial paper — 500 — 500 Certificates of deposit 2,555 — — 2,555 Long-term investments: U.S. Agency securities — 497 — 497 Corporate bonds — 874 — 874 Certificates of deposit 2,119 — — 2,119 Total $ 6,016 $ 11,683 $ — $ 17,699 During the three months ended March 31, 2016 and 2015 , the Company did not have any transfers of financial assets measured at fair value on a recurring basis to or from Level 3. The Company did not hold any Level 3 assets or liabilities as of March 31, 2016 or December 31, 2015 . The carrying amounts of the Company’s cash equivalents, accounts receivable and accounts payable approximate fair value due to their relatively short maturities.

Balance Sheet Components

Balance Sheet Components	3 Months Ended
	Mar. 31, 2016
Organization, Consolidation and Presentation of Financial Statements [Abstract]
Balance Sheet Components	Balance Sheet Components Investments The Company's short-term and long-term investments as of March 31, 2016 are as follows (in thousands): Short-term Amortized Cost Gross Unrealized Gains Gross Unrealized Losses Fair Value U.S. Agency securities $ 750 $ — $ — $ 750 U.S. Treasury — — — — Corporate bonds 3,914 1 (2 ) 3,913 Commercial paper — — — — Certificates of deposit — — — — Total $ 4,664 $ 1 $ (2 ) $ 4,663 Long-term Amortized Cost Gross Unrealized Gains Gross Unrealized Losses Fair Value U.S. Agency securities $ — $ — $ — $ — Corporate bonds 611 1 — 612 Certificates of deposit 245 — — 245 Total $ 856 $ 1 $ — $ 857 The Company's short-term and long-term investments as of December 31, 2015 are as follows (in thousands): Short-term Amortized Cost Gross Unrealized Gains Gross Unrealized Losses Fair Value U.S. Agency securities $ 1,551 $ — $ (2 ) $ 1,549 U.S. Treasury 500 — — 500 Corporate bonds 7,776 — (13 ) 7,763 Commercial paper 500 — — 500 Certificates of deposit 2,555 — — 2,555 Total $ 12,882 $ — $ (15 ) $ 12,867 Long-term Amortized Cost Gross Unrealized Gains Gross Unrealized Losses Fair Value U.S. Agency securities $ 499 $ — $ (2 ) $ 497 U.S. Treasury — — — — Corporate bonds 878 — (4 ) 874 Certificates of deposit 2,119 — — 2,119 Total $ 3,496 $ — $ (6 ) $ 3,490 For each of the three months ended March 31, 2016 and 2015 , gains or losses realized on the sale of investments were insignificant. The contractual maturities of the Company's short-term and long-term investments as of March 31, 2016 are as follows (in thousands): March 31, 2016 Amortized Cost Fair Value Due in one year or less $ 4,664 $ 4,663 Due in one year to five years 856 857 $ 5,520 $ 5,520 When evaluating the investments for other-than-temporary impairment, the Company reviews factors such as the length of time and extent to which fair value has been below the amortized cost basis, review of current market liquidity, interest rate risk, the financial condition of the issuer, as well as credit rating downgrades. The Company believes that the unrealized losses are not other-than-temporary. The Company does not have a foreseeable need to liquidate the portfolio and anticipates recovering the full cost of the securities either as market conditions improve, or as the securities mature. Inventory Inventory is stated at the lower of cost (which approximates actual cost on a first-in, first-out basis) or market. Inventory that is obsolete or in excess of forecasted usage is written down to its estimated net realizable value based on assumptions about future demand and market conditions. The components of inventory consist of the following (in thousands): March 31, December 31, Raw materials $ 10,698 $ 9,117 Finished goods 21,864 18,978 Total inventory $ 32,562 $ 28,095 Property and equipment, net Property and equipment, net comprised the following (in thousands): March 31, December 31, Lab equipment, tooling and molds $ 3,375 $ 3,228 Computer software 2,499 2,019 Computer equipment 2,844 2,757 Leasehold improvements 1,825 1,670 Furniture and fixtures 1,057 950 Vehicles 35 35 Total property and equipment 11,635 10,659 Less: Accumulated depreciation and amortization (6,179 ) (5,635 ) Construction in progress 2,055 1,945 Property and equipment, net $ 7,511 $ 6,969 The table above includes property and equipment acquired under capital leases which totaled $0.4 million as of both March 31, 2016 and December 31, 2015 . Depreciation and amortization expense related to property and equipment was $0.5 million for the three months ended March 31, 2016 . Depreciation and amortization expense related to property and equipment was $0.3 million for the three months ended March 31, 2015 . Accrued and Other Current Liabilities The following table shows the components of accrued liabilities (in thousands): March 31, December 31, Accrued payroll and employee related expenses $ 9,506 $ 14,887 Accrued marketing expenses 6,157 5,554 Accrued royalty 4,693 5,453 Sales and other taxes payable 3,507 3,703 Advance payments from customers 864 1,585 Accrued warranty 1,052 527 Accrued legal expenses 2,527 1,465 Other 3,020 1,517 Total accrued and other current liabilities $ 31,326 $ 34,691 Deferred Revenue The following table shows the components of deferred revenue, including long-term deferred revenue (in thousands): March 31, December 31, Deferred extended warranty revenue 2,901 2,902 Deferred training revenue 3,408 3,115 Other deferred revenue 4,542 1,891 Total deferred revenue $ 10,851 $ 7,908 Deferred Extended Warranty Revenue The Company offers standard extended warranties which allows customers to receive service and support which extend beyond the contractual term of the product warranty. The Company recognizes these contracts over the life of the service period. Changes in the Company's deferred revenue, including long-term deferred revenue, related to extended warranties were as follows (in thousands): March 31, March 31, Balance at the beginning of the period $ 2,902 $ 3,272 Extended warranties issued 1,004 732 Amortization (1,005 ) (789 ) Balance at the end of the period $ 2,901 $ 3,215 Product Warranties The Company provides a standard limited warranty on its products of one year for both control units and applicators for its direct customers. For indirect customers in international markets, the Company provides a standard limited warranty on its products of generally 3.2 years for control units and 1.2 years for applicators. The Company accrues for the estimated future costs of repair or replacement upon shipment. The warranty accrual is recorded to cost of revenue and is based upon historical trends in the volume of product failures during the warranty period and the cost to repair or replace the equipment. The Company bases product warranty costs on related freight, material, technical support labor and overhead costs. The estimated product warranty costs are assessed by considering historical costs and applying the experienced failure rates to the outstanding warranty period for products sold. The Company exercises judgment in estimating the expected product warranty costs, using data such as the actual product failure rates, and average repair costs, including freight, material, technical support labor, and overhead costs, for products returned under warranty. Changes in product warranty accrual was as follows (in thousands): Three Months Ended March 31, 2016 2015 Balance at the beginning of the period $ 527 $ 569 Settlements of warranties (225 ) (100 ) Provision 750 (29 ) Balance at the end of the period $ 1,052 $ 440

Intangible Asset, Net

Intangible Asset, Net	3 Months Ended
	Mar. 31, 2016
Goodwill and Intangible Assets Disclosure [Abstract]
Intangible Asset, Net	Intangible Asset, Net The Company's intangible asset consists of an exclusive license agreement with Massachusetts General Hospital, or MGH, for commercializing patents and other technology. All milestone payments payable by the Company pursuant to the terms of the agreement subsequent to the date of the Food and Drug Administration, or FDA, clearance were capitalized as purchased technology when paid, and are subsequently amortized into cost of revenue using the straight-line method over the estimated remaining useful life of the technology, not to exceed the term of the agreement or the life of the patent. Intangible asset, net comprised the following (in thousands): March 31, December 31, Purchased technology $ 8,050 $ 8,050 Less: Accumulated amortization (3,120 ) (2,958 ) Intangible asset, net $ 4,930 $ 5,092 Amortization expense of the intangible asset was $0.2 million for both the three months ended March 31, 2016 and 2015 . The total estimated annual future amortization expense of this intangible asset as of March 31, 2016 , is as follows (in thousands): Fiscal Year 2016 (remaining 9 months) $ 488 2017 650 2018 650 2019 650 2020 650 Thereafter 1,842 Total $ 4,930

Related Party Transactions

Related Party Transactions	3 Months Ended
	Mar. 31, 2016
Related Party Transactions [Abstract]
Related Party Transactions	Related Party Transactions Brazilian Distribution Agreement The Company entered into a distribution agreement with ADVANCE Medical, Inc. and its wholly owned subsidiaries, Immunotech and BIOGEN, or ADVANCE, dated March 18, 2011 , as the Company's exclusive distributor of CoolSculpting in Brazil and Mexico, as amended on August 29, 2011 , February 27, 2012 and September 4, 2012 . The distribution agreement was further amended on August 15, 2014, whereby ADVANCE is no longer a distributor in Mexico, effective November 13, 2014 . As the exclusive distributor in Brazil, ADVANCE is required to purchase a minimum quantity of the Company’s products each calendar quarter throughout the term of the distribution agreement which expires on December 31, 2018 . Venrock, a principal stockholder of the Company, owns an equity interest in ADVANCE Medical, Ltd., the parent company of ADVANCE. Dr. Bryan E. Roberts, who is a member of the Company's Board of Directors, is also a partner of Venrock Associates. ADVANCE purchases product with payment terms up to 180 days, and to date no amounts have been determined to be unrecoverable. The revenue recognized by the Company under this distribution agreement was $0.9 million for the three months ended March 31, 2016 , compared to $1.3 million for the three months ended March 31, 2015 . The accounts receivable balance under this distribution agreement was insignificant as of March 31, 2016 and $1.7 million as of December 31, 2015 .

Commitments And Contingencies

Commitments And Contingencies	3 Months Ended
	Mar. 31, 2016
Commitments and Contingencies Disclosure [Abstract]
Commitments and Contingencies	Commitments and Contingencies Operating Lease Obligations The Company leases facilities under non-cancellable operating leases with various expiration dates. Specifically, the Company occupies a facility in Pleasanton, California, under a lease which extends through March 2019, a manufacturing facility in Dublin, California, under a lease which extends through May 2017, and a warehouse space in Livermore, California, under a lease which extends through May 2017. The Company also occupies office and warehouse space near Gatwick, United Kingdom, under a lease which extends through December 2018, as well as office space in London, United Kingdom, under a lease which extends through April 2016, Taipei, Taiwan, under a lease which extends through August 2016, Seoul, South Korea, under a lease which extends through August 2016, Reston, Virginia, under a lease which extends through September 2021, Galway, Ireland under a lease which extends through September 2016 . Rent expense for non-cancellable operating leases with scheduled rent increases is recognized on a straight-line basis over the lease term. Rent expense was $0.6 million for the three months ended March 31, 2016 , compared to $0.5 million for the three months ended March 31, 2015 . Future minimum lease payments under the Company's non-cancellable operating leases as of March 31, 2016 are as follows (in thousands): Year Ending December 31, Amount 2016 (remaining 9 months) $ 1,804 2017 2,182 2018 2,040 2019 896 2020 529 Thereafter 408 Total future minimum lease payments $ 7,859 Capital Lease Obligations The Company has entered into certain capital lease obligations to purchase equipment for operations which include a bargain purchase option. The underlying assets and related depreciation are included in the appropriate property and equipment category and related accumulated depreciation account. Property and equipment includes amounts under leases that have been capitalized as follows (dollars in thousands): Useful life (Years) March 31, 2016 December 31, Computer equipment 3 $ 382 $ 382 Total capital leased equipment 382 382 Less: Accumulated depreciation and amortization (181 ) (149 ) Capital leased equipment, net $ 201 $ 233 Total depreciation of assets acquired under capital leases was $32,000 for each of the three months ended March 31, 2016 and March 31, 2015 , which is included in total depreciation and amortization expense. Future minimum payments required under capital leases as of March 31, 2016 , are as follows (in thousands): Year Ending March 31, Amount 2016 (remaining 9 months) $ 99 2017 141 Total future payments $ 240 Less: Amount representing interest $ 9 Present value of future minimum payments 231 Less: Current portion 125 Long term portion $ 106 Purchase Commitments The Company had non-cancellable purchase obligations to contract manufacturers and suppliers for $4.1 million and $5.9 million at March 31, 2016 and December 31, 2015 , respectively. Unrecognized Tax Benefits The Company's gross liability for unrecognized tax benefits totaled $0.3 million , including estimated interest and penalties, as of March 31, 2016 , and is classified in other non-current liabilities. The Company is unable to make a reasonably reliable estimate of the timing of payments in individual years due to uncertainties in the timing of tax audits, if any, or their outcomes. Legal Matters From time to time, the Company may be involved in legal and administrative proceedings and claims of various types. Additionally, the Company may be subject to insurance related claims resulting from matters associated with CoolSculpting treatments. The Company records a liability in its condensed consolidated financial statements for these matters when a loss is known and considered probable and the amount can be reasonably estimated. Management reviews these estimates in each accounting period as additional information becomes known and adjusts the loss provision when appropriate. If the loss is not probable or cannot be reasonably estimated, a liability is not recorded in the consolidated financial statements. If a loss is probable but the amount of loss cannot be reasonably estimated, the Company discloses the loss contingency and an estimate of possible loss or range of loss (unless such an estimate cannot be made). The Company does not recognize gain contingencies until they are realized. Legal costs incurred in connection with loss contingencies are expensed as incurred. Product Liability Contingencies The Company has historically been and continues to be predominantly self-insured for any product liability losses related to its products. The Company obtains third-party insurance to limit its exposure to these claims, but this insurance is subject to a cap on reimbursement. Product liability losses are, by their nature, uncertain and are based upon complex judgments and probabilities. The Company accrues for reported claims and estimates for incurred, but not reported claims, to the extent that such losses can be reasonably estimated. The Company determines its accruals for probable product liability losses based on various factors, including historical claims and settlement experience. The total amount of self-insured product liability claims settled in the quarter ended March 31, 2016 was $0.9 million . The total amount of self-insured product liability claims settled during the quarter ended March 31, 2015 was insignificant. The amount of reported and estimated incurred but not known self-insured product liability claims pending was $1.8 million as of March 31, 2016 and $1.1 million as of December 31, 2015 , which is recorded in accrued and other current liabilities on the Company's condensed consolidated balance sheet and expected to be paid within one year. Indemnifications In the normal course of business, the Company enters into contracts that contain a variety of representations and warranties and provide for general indemnifications. The Company's exposure under these agreements is unknown because it involves claims that may be made against the Company in the future, but have not yet been made. To date, the Company has not paid any claims, and the Company believes that the estimated fair value of these indemnification obligations is minimal and it has not accrued any amounts for these obligations. Separation Agreements On February 25, 2016 , the Company's former Chief Financial Officer and the Company mutually agreed that the former Chief Financial Officer would cease to be an officer and employee of the Company which resulted in the Company incurring $0.3 million in termination benefits. In addition, stock-based compensation expense relating to the modifications of the former Chief Financial Officer's stock options and stock awards totaled $1.1 million , of which $0.8 million was recognized as stock-based compensation during the quarter ended March 31, 2016 and $0.3 million will be recognized in the quarter ending June 30, 2016 .

Stock-Based Compensation Expens

Stock-Based Compensation Expense	3 Months Ended
	Mar. 31, 2016
Disclosure of Compensation Related Costs, Share-based Payments [Abstract]
Stock-Based Compensation Expense	Stock-Based Compensation Expense Share-Based Awards Available for Grant A summary of share-based awards available for grant is as follows: Shares Available for Grant Balance, December 31, 2015 3,517,305 Additional shares reserved 1,000,000 Options granted (302,226 ) Restricted stock units granted (379,569 ) Options canceled 217 Restricted stock units canceled 39,189 Restricted stock units withheld for tax 112,546 Balance, March 31, 2016 3,987,462 Stock Option Awards A summary of the stock option activity is as follows: Options Outstanding Number of Stock Options Outstanding Weighted- Average Exercise Price Balance, December 31, 2015 2,641,592 $ 6.86 Options granted 302,226 22.25 Options exercised (6,594 ) 5.67 Options canceled (217 ) 6.38 Balance, March 31, 2016 2,937,007 $ 8.44 Restricted Stock Activity Activity related to restricted stock units and awards is set forth below: Number of Units and Awards Weighted- Balance, December 31, 2015 1,312,651 $ 19.09 Restricted stock units granted 379,569 22.79 Restricted stock units vested (308,634 ) 24.17 Restricted stock units canceled (39,189 ) 23.49 Balance, March 31, 2016 1,344,397 $ 20.82 During the three months ended March 31, 2016 , 308,634 shares vested subject to previously granted restricted stock units. A majority of these vested restricted stock units were net share settled. During the three months ended March 31, 2016 , the Company withheld 112,546 shares based upon the Company's closing stock price on the vesting date to settle the employee's minimum statutory obligation for the applicable income and other employment taxes. During the three months ended March 31, 2015 , 330,201 shares vested subject to previously granted restricted stock units. A majority of these vested restricted stock units were net share settled. During the three months ended March 31, 2015 , the Company withheld 133,035 shares based upon the Company's closing stock price on the vesting date to settle the employee's minimum statutory obligation for the applicable income and other employment taxes. Subsequently, the Company remitted cash to the appropriate taxing authorities. Total payments for employee's tax obligations to the relevant taxing authority were $2.6 million for the three months ended March 31, 2016 . Total payments for employee's tax obligations to the relevant taxing authority were $4.3 million for the three months ended March 31, 2015 . The payments were for taxes related to the net share settlements of restricted stock units. Stock-Based Compensation Expense Stock-based compensation related to all of the Company's stock-based awards and employee stock purchases was recorded as an expense or a reduction to revenue and are categorized as follows (in thousands): Three Months Ended March 31, 2016 2015 Revenue $ — $ 80 Cost of revenue 232 134 Research and development 501 350 Sales and marketing 1,383 1,551 General and administrative 2,086 2,035 Total stock-based compensation $ 4,202 $ 4,150 As of March 31, 2016 , the total unrecognized compensation costs related to outstanding stock options, awards and employee stock purchases was $26.2 million , which is expected to be recognized using the straight-line attribution method over 2.9 years . Performance-Based Awards From time to time, the Company will issue performance-based stock options and restricted stock units to senior executives. During both the three months ended March 31, 2016 and 2015 , the Company granted 40,000 performance-based restricted stock units to a senior executive, which was accounted for as an equity award. The number of units that ultimately vest depends on achieving certain performance criteria and can range from 0% to 100% of the number of units granted. The performance criteria are specific to the roles of each of the executives and are set by the Compensation Committee of the Board of Directors. The performance-based restricted stock units have no dividend or voting rights during the performance period. Each of the performance-based restricted stock units represents the contingent right to receive one share of the Company's common stock if the vesting conditions are satisfied. Compensation expense related to these grants is based on the grant date fair value of the award. Stock-based compensation expense includes charges related to performance-based stock options and restricted stock units granted to certain executives. Stock-based compensation expense related to these stock options and restricted stock units was $0.4 million for the three months ended March 31, 2016 , compared to $1.5 million for the three months ended March 31, 2015 . Employee Stock-Based Compensation The Company uses the Black-Scholes option pricing model to determine the fair value of stock options. The valuation model for stock-based compensation expense requires the Company to make assumptions and judgments about the variables used in the calculation including the expected term (weighted-average period of time that the options granted are expected to be outstanding), volatility of the Company's common stock, an assumed-risk-free interest rate and the estimated forfeitures of unvested stock options. The Company's assumptions related to the expected term and volatility are detailed below. The fair value of employee stock options was estimated using the following weighted-average assumptions: Three Months Ended March 31, 2016 2015 Expected term (in years) 4.8 4.8 Expected volatility 63 % 63 % Risk-free interest rate 1.21 % 1.29 % Expected dividend yield — % — % Expected Term . Subsequent to the Company's initial public offering of its common stock, or IPO, and through 2014, the expected term used was based on expected term of a group of similar entities, referred to as its “peer group.” In evaluating similarity, the Company considered factors such as industry, stage of life cycle and size. In 2015, the Company modified its approach by including its own historical data along with the expected term of the identified peer group companies. The Company will continue to apply this methodology until a sufficient amount of historical information regarding its own expected term becomes available. Volatility . Subsequent to the IPO, and through 2014, the Company continued to estimate its volatility based on its peer group as the Company did not have sufficient historical data regarding its specific volatility. In 2015, the Company modified its approach by including its own common stock trading history along with the volatility of the identified peer group companies. The expected stock price volatility is estimated using a combination of historical and peer group volatility to derive the expected volatility assumption. The Company believes the blended volatility is more representative of future stock price trends over the expected life of the options rather than just using historical or peer group volatility. The Company will continue to apply this methodology until a sufficient amount of historical information regarding the volatility of its own stock price becomes available. Risk-Free Interest Rate . The risk-free interest rate is based on U.S. Treasury zero-coupon issues with remaining terms similar to the expected term on the options. Dividend Yield . The Company has never paid any dividends and does not plan to pay dividends in the foreseeable future, and, therefore, used an expected dividend yield of zero in the valuation model. Forfeitures. The Company is required to estimate forfeitures at the time of grant, and revise those estimates in subsequent periods if actual forfeitures differ from those estimates. The Company uses historical data to estimate pre-vesting option forfeitures and to record stock-based compensation expense only for those awards that are expected to vest. To the extent actual forfeitures differ from the estimates, the difference will be recorded as a cumulative adjustment in the period that the estimates are revised. During the three months ended March 31, 2016 , the Company granted 302,226 stock options to employees with a weighted-average grant date fair value of $22.25 per share. During the three months ended March 31, 2015 , the Company granted 45,622 stock options to employees with a weighted-average grant date fair value of $18.19 per share. During the three months ended March 31, 2016 , the Company granted 379,569 restricted stock units to employees with a weighted-average grant date fair value of $22.79 per share. During the three months ended March 31, 2015 , the Company granted 353,757 restricted stock units to employees with a weighted-average grant date fair value of $31.95 per share. As of March 31, 2016 , the unrecognized compensation cost related to the Company's employee stock purchase plan, or ESPP, was $0.2 million , which will be recognized using the straight-line attribution method over 0.2 years . Stock-Based Compensation for Non-employees Stock-based compensation expense related to stock-based awards to non-employees is recognized as the stock-based awards are earned, generally through the provision of services. The Company believes that the fair value of the stock-based awards is more reliably measurable than the fair value of the services received. The fair value of the granted stock-based awards is calculated at each reporting date using the Black-Scholes option pricing model. During the three months ended March 31, 2016, the Company granted stock-based awards to a non-employee which will vest over two years. Stock-based compensation expense for non-employees was insignificant for the three months ended March 31, 2016 and $0.1 million for the three months ended March 31, 2015 .

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 Basic net loss per share is calculated by dividing the net loss by the weighted-average number of shares of common stock outstanding for the period. Diluted net loss per share is computed by giving effect to all potentially dilutive securities outstanding during the period, including stock options, restricted stock units and common stock issuable pursuant to the ESPP. A reconciliation of the numerator and denominator used in the calculation of the basic and diluted net loss per share is as follows: Three Months Ended March 31, 2016 2015 Numerator Net loss (in thousands) $ (9,870 ) $ (2,129 ) Denominator Weighted average shares of common stock outstanding used in computing net loss per share, basic 39,288,853 38,383,022 Dilutive effect of incremental shares and share equivalents — — Weighted average shares of common stock outstanding used in computing net loss per share, diluted 39,288,853 38,383,022 Net loss per share: Net loss per share, basic and diluted $ (0.25 ) $ (0.06 ) The following outstanding potentially dilutive securities were excluded from the computation of diluted net loss per share of common stock for the periods presented, because including them would have been anti-dilutive: Three Months Ended March 31, 2016 2015 Options to purchase common stock 2,937,007 3,025,095 Restricted stock units 1,344,397 1,498,245 Common stock issuable pursuant to the ESPP — 8,874 Total 4,281,404 4,532,214

Income Taxes

Income Taxes	3 Months Ended
	Mar. 31, 2016
Income Tax Disclosure [Abstract]
Income Taxes	Income Taxes The Company recorded income tax benefit of $0.7 million and income tax expense of $28,000 for the three months ended March 31, 2016 and March 31, 2015 , respectively. The income tax benefit for the three months ended March 31, 2016 reflects a year to date pre-tax loss in the Company's operating entities in various taxing jurisdictions, while the income tax expense for the three months ended March 31, 2015 reflects the mixture and distribution of pre-tax income. The Company continues to maintain a valuation allowance on its deferred tax assets relating to its California R&D credits. The Company generated pre-tax year-to-date ordinary losses in its zero-rate jurisdiction, and the Company has elected to exclude these pre-tax year-to-date ordinary losses from its zero-rate jurisdiction from its estimated effective tax rate computations. The exclusion is based on the notion that a loss in a zero-rate jurisdiction ultimately will not provide the Company a tax benefit. At March 31, 2016 , the Company had $3.2 million of unrecognized tax benefits. The Company recognizes interest and penalties related to uncertain tax positions as part of the income tax provision. To date, such interest and penalties have not been material. During the fourth quarter of the year ended December 31, 2015, the Company released its valuation allowance against U.S. federal and state deferred tax assets, with the exception of the California research and development credit carryforwards. Based upon the evaluation of positive and negative evidence supporting the realizability of deferred tax assets as of the quarter ended March 31, 2016, there remains sufficient positive evidence to support the realization of U.S. federal and state deferred tax assets, with the exception of California research and development credit carryforwards. The Company files annual income tax returns in multiple taxing jurisdictions around the world, including the U.S. federal and state jurisdictions, Ireland and the United Kingdom. A number of years may elapse before an uncertain tax position is audited and finally resolved. While it is often difficult to predict the final outcome or the timing of resolution of any particular uncertain tax position, the Company believes that its reserves for income taxes reflect the most likely outcome. The Company adjusts these reserves, as well as the related interest, in light of changing facts and circumstances. Settlement of any particular position could require the use of cash. As of March 31, 2016 , changes to the Company's uncertain tax positions in the next 12 months that are reasonably possible are not expected to have a significant impact on the Company's financial position or results of operations.

Segment Information

Segment Information	3 Months Ended
	Mar. 31, 2016
Segment Reporting [Abstract]
Segment Information	Segment Information Operating segments are defined as components of an enterprise about which separate financial information is available that is evaluated regularly by the chief operating decision maker, or decision making group, in deciding how to allocate resources and in assessing performance. The Company’s chief operating decision maker is its Chief Executive Officer. The Company has one business activity and there are no segment managers who are held accountable for operations. Accordingly, the Company has a single reportable segment structure. All of the Company’s principal operations and decision-making functions are located in the United States. The Company’s revenue by geographic region, based on the location to where the product was shipped, is summarized as follows (in thousands): Three Months Ended March 31, 2016 2015 North America $ 51,469 $ 35,229 International 13,000 16,329 Total $ 64,469 $ 51,558 North America includes the United States and related territories, as well as Canada. International is the rest of the world. Revenue for the United States was $51.3 million for the three months ended March 31, 2016 , compared to $33.2 million for the three months ended March 31, 2015 . The following table sets forth revenue by product (in thousands): Three Months Ended March 31, 2016 2015 System revenue $ 24,689 $ 26,156 Consumable revenue 39,780 25,402 Total $ 64,469 $ 51,558 Substantially all of the Company’s long-lived assets are located in the United States of America.

Basis of Presentation and Sum17

Basis of Presentation and Summary of Significant Accounting Policies (Policies)	3 Months Ended
	Mar. 31, 2016
Organization, Consolidation and Presentation of Financial Statements [Abstract]
Basis of Presentation	Basis of Presentation The accompanying interim condensed consolidated financial statements of ZELTIQ Aesthetics, Inc. (the "Company") are unaudited. These interim condensed consolidated financial statements have been prepared in accordance with generally accepted accounting principles in the United States of America, or GAAP, and the applicable rules and regulations of the Securities and Exchange Commission, or SEC, for interim financial information. Accordingly, they do not include all of the information and footnotes required by GAAP for complete financial statements. The December 31, 2015 condensed consolidated balance sheet was derived from the audited financial statements as of that date, but does not include all of the information and footnotes required by GAAP for complete financial statements. The accompanying unaudited interim condensed consolidated financial statements have been prepared on the same basis as the audited consolidated financial statements and, in the opinion of management, reflect all adjustments of a normal recurring nature considered necessary to state fairly the Company's financial position as of March 31, 2016 , results of operations for the three months ended March 31, 2016 and 2015 , comprehensive loss for the three months ended March 31, 2016 and 2015 , and cash flows for the three months ended March 31, 2016 and 2015 . The interim results for the three months ended March 31, 2016 are not necessarily indicative of the results that may be expected for the year ending December 31, 2016 or for any other future annual or interim period. The information included in this Quarterly Report on Form 10-Q should be read in conjunction with “Management’s Discussion and Analysis of Financial Condition and Results of Operations," “Quantitative and Qualitative Disclosures About Market Risk” and the Consolidated Financial Statements and notes thereto included in Items 7, 7A and 8, respectively, in the Company's Annual Report on Form 10-K for the year ended December 31, 2015 .
Principles of Consolidation	Principles of Consolidation The condensed consolidated financial statements include the accounts of the Company and its wholly-owned subsidiaries. All significant intercompany accounts and transactions have been eliminated.
Foreign Currency	The functional currency of the Company’s international subsidiaries is evaluated on a case-by-case basis and has been determined to be the local currency with the exception of Malta which carries a U.S. dollar functional currency. All assets and liabilities of these foreign operations are translated to U.S. Dollars at current period end exchange rates, and revenue and expenses are translated to U.S. Dollars using average exchange rates in effect during the period. The gains and losses from the foreign currency translation of the foreign subsidiaries' financial statements are included as a separate component of stockholders' equity under "Accumulated other comprehensive income (loss)." Gains or losses arising from currency exchange rate fluctuations on transactions denominated in a currency other than the local functional currency are included in other income (expense), net.
Use of Estimates	Use of Estimates The preparation of financial statements in conformity with GAAP requires management to make certain estimates and assumptions that affect the reported amounts of assets and liabilities and disclosure of contingent assets and liabilities at the date of the financial statements and the reported amounts of revenue and expenses during the reported periods. The primary estimates underlying the Company's financial statements include the value of revenue elements, product warranty, inventory valuation, allowance for doubtful accounts receivable, assumptions regarding variables used in calculating the fair value of the Company's equity awards, fair value of investments, useful lives of intangibles, income taxes and contingent liabilities. Actual results could differ from those estimates.
Critical Accounting Policies	Significant Accounting Policies There have been no material changes to the Company’s significant accounting policies during the three months ended March 31, 2016 , as compared to the significant accounting policies described in the Company’s Annual Report on Form 10-K for the year ended December 31, 2015 .
Recent Accounting Pronouncements	Recent Accounting Pronouncements On May 28, 2014 , the Financial Accounting Standards Board, or FASB, issued Accounting Standards Update No. 2014-09, Revenue from Contracts with Customers. On August 12, 2015 , the FASB issued ASU 2015-14, Revenue from Contracts with Customers (Topic 606): Deferral of the Effective Date, which delays the effective date of ASU 2014-09 by one year. In March 2016, the FASB issued ASU 2016-08 which included amendments to the guidance in the new standard on assessing whether an entity is a principal or an agent in a revenue transaction. This conclusion impacts whether an entity reports revenue on a gross or net basis. In April 2016, the FASB issued ASU 2016-10 which includes additional amendments to the guidance in the new revenue standard on identifying performance obligations and accounting for licenses of intellectual property. The objective of this update is to provide a single, comprehensive revenue recognition model for all contracts with customers to improve comparability within industries, across industries, and across capital markets. This standard update contains principles that the Company will apply to determine the measurement of revenue and timing of when it is recognized. This guidance allows for two methods of adoption: (a) full retrospective adoption, meaning the guidance is applied to all periods presented, or (b) modified retrospective adoption, meaning the cumulative effect of applying this guidance is recognized as an adjustment to the fiscal 2018 opening accumulated deficit balance. The Company expects to adopt this guidance effective January 1, 2018 , and is currently evaluating the two adoption methods as well as the impact this new guidance will have on its consolidated financial statements and related disclosures. In July 2015 , the FASB issued Accounting Standards Update No. 2015-11 to amend ASC Topic 330, Inventory ("ASC 330") to simplify the measurement of inventory. The amendments require that an entity measure inventory at the lower of cost and net realizable value instead of the lower of cost and market. This guidance is effective for public companies for years, and interim periods within those years, beginning on or after December 15, 2016, with earlier application permitted as of the beginning of an interim or annual reporting period. This guidance will be effective for the Company beginning in its first quarter of fiscal 2017. The Company is currently evaluating the impact this new guidance will have on its consolidated financial statements and related disclosures. In February 2016, the FASB issued Accounting Standards Update No. 2016-02, Leases. This ASU requires lease assets and lease liabilities arising from leases, including operating leases, to be recognized on the balance sheet. ASU 2016-02 will become effective for the Company on January 1, 2019, and requires adoption using a modified retrospective approach. The Company is currently evaluating the impact of this guidance on its consolidated financial statements and related disclosures. In March 30, 2016, the FASB issued Accounting Standards Update No. 2016-09, Improvements to Employee Share-Based Payment Accounting. This ASU will change how companies account for certain aspects of share-based payments to employees. This guidance will require all income tax effects of awards to be recognized in the income statement when the awards vest or are settled. It also will allow an employer to repurchase more of an employee's shares than it can today for tax withholding purposes without triggering liability accounting and to make a policy election to account for forfeitures as they occur. The guidance is effective for public business entities for fiscal years beginning after December 2016, and interim periods within those years, with earlier application permitted in any annual or interim period for which financial statements haven't been issued or made available for issuance, but all of the guidance must be adopted in the same period. The Company is currently evaluating the impact this new guidance will have on its consolidated financial statements and related disclosures.
Fair Value of Financial Instruments	Fair value is defined as the price that would be received to sell an asset or paid to transfer a liability (an exit price) in an orderly transaction between market participants at the reporting date. The accounting guidance establishes a three-tiered hierarchy, which prioritizes the inputs used in the valuation methodologies in measuring fair value: • Level 1—Quoted prices in active markets for identical assets or liabilities. • Level 2—Inputs other than Level 1 that are observable, either directly or indirectly, such as quoted prices in markets that are not active, or other inputs that are observable or can be corroborated by observable market data for substantially the full term of the assets or liabilities. • Level 3—Unobservable inputs that are supported by little or no market activity and that are significant to the fair value of the assets or liabilities. The categorization of a financial instrument within the valuation hierarchy is based on the lowest level of input that is significant to the fair value measurement. The Company classifies its cash equivalents and investments within Level 1 and Level 2, as it uses quoted market prices or alternative pricing sources and models utilizing market observable inputs.
Inventory	Inventory Inventory is stated at the lower of cost (which approximates actual cost on a first-in, first-out basis) or market. Inventory that is obsolete or in excess of forecasted usage is written down to its estimated net realizable value based on assumptions about future demand and market conditions.

Fair Value of Financial Instr18

Fair Value of Financial Instruments (Tables)	3 Months Ended
	Mar. 31, 2016
Fair Value Disclosures [Abstract]
Fair value of financial assets and liabilities by level within fair value hierarchy	The following tables set forth the fair value of the Company’s financial assets and liabilities by level within the fair value hierarchy (in thousands): As of March 31, 2016 Level 1 Level 2 Level 3 Fair Value Financial Assets Cash equivalents: Money market funds $ 2,244 $ — $ — $ 2,244 Short-term investments: U.S. Agency securities — 750 — 750 U.S. Treasury — — — — Corporate bonds — 3,913 — 3,913 Commercial paper — — — — Certificates of deposit — — — — Long-term investments: U.S. Agency securities — — — — Corporate bonds — 612 — 612 Certificates of deposit 245 — — 245 Total $ 2,489 $ 5,275 $ — $ 7,764 As of December 31, 2015 Level 1 Level 2 Level 3 Fair Value Financial Assets Cash equivalents: Money market funds $ 1,342 $ — $ — $ 1,342 Short-term investments: U.S. Agency securities — 1,549 — 1,549 U.S. Treasury — 500 — 500 Corporate bonds — 7,763 — 7,763 Commercial paper — 500 — 500 Certificates of deposit 2,555 — — 2,555 Long-term investments: U.S. Agency securities — 497 — 497 Corporate bonds — 874 — 874 Certificates of deposit 2,119 — — 2,119 Total $ 6,016 $ 11,683 $ — $ 17,699

Balance Sheet Components (Table

Balance Sheet Components (Tables)	3 Months Ended
	Mar. 31, 2016
Organization, Consolidation and Presentation of Financial Statements [Abstract]
Schedule of Investments	The Company's short-term and long-term investments as of March 31, 2016 are as follows (in thousands): Short-term Amortized Cost Gross Unrealized Gains Gross Unrealized Losses Fair Value U.S. Agency securities $ 750 $ — $ — $ 750 U.S. Treasury — — — — Corporate bonds 3,914 1 (2 ) 3,913 Commercial paper — — — — Certificates of deposit — — — — Total $ 4,664 $ 1 $ (2 ) $ 4,663 Long-term Amortized Cost Gross Unrealized Gains Gross Unrealized Losses Fair Value U.S. Agency securities $ — $ — $ — $ — Corporate bonds 611 1 — 612 Certificates of deposit 245 — — 245 Total $ 856 $ 1 $ — $ 857 The Company's short-term and long-term investments as of December 31, 2015 are as follows (in thousands): Short-term Amortized Cost Gross Unrealized Gains Gross Unrealized Losses Fair Value U.S. Agency securities $ 1,551 $ — $ (2 ) $ 1,549 U.S. Treasury 500 — — 500 Corporate bonds 7,776 — (13 ) 7,763 Commercial paper 500 — — 500 Certificates of deposit 2,555 — — 2,555 Total $ 12,882 $ — $ (15 ) $ 12,867 Long-term Amortized Cost Gross Unrealized Gains Gross Unrealized Losses Fair Value U.S. Agency securities $ 499 $ — $ (2 ) $ 497 U.S. Treasury — — — — Corporate bonds 878 — (4 ) 874 Certificates of deposit 2,119 — — 2,119 Total $ 3,496 $ — $ (6 ) $ 3,490
Schedule of Contractual Maturities of Investments	The contractual maturities of the Company's short-term and long-term investments as of March 31, 2016 are as follows (in thousands): March 31, 2016 Amortized Cost Fair Value Due in one year or less $ 4,664 $ 4,663 Due in one year to five years 856 857 $ 5,520 $ 5,520
Schedule of Inventory	The components of inventory consist of the following (in thousands): March 31, December 31, Raw materials $ 10,698 $ 9,117 Finished goods 21,864 18,978 Total inventory $ 32,562 $ 28,095
Schedule of Property and Equipment, Net	Property and equipment, net comprised the following (in thousands): March 31, December 31, Lab equipment, tooling and molds $ 3,375 $ 3,228 Computer software 2,499 2,019 Computer equipment 2,844 2,757 Leasehold improvements 1,825 1,670 Furniture and fixtures 1,057 950 Vehicles 35 35 Total property and equipment 11,635 10,659 Less: Accumulated depreciation and amortization (6,179 ) (5,635 ) Construction in progress 2,055 1,945 Property and equipment, net $ 7,511 $ 6,969
Schedule of Accrued Liabilities	The following table shows the components of accrued liabilities (in thousands): March 31, December 31, Accrued payroll and employee related expenses $ 9,506 $ 14,887 Accrued marketing expenses 6,157 5,554 Accrued royalty 4,693 5,453 Sales and other taxes payable 3,507 3,703 Advance payments from customers 864 1,585 Accrued warranty 1,052 527 Accrued legal expenses 2,527 1,465 Other 3,020 1,517 Total accrued and other current liabilities $ 31,326 $ 34,691
Schedule of Deferred Revenue	The following table shows the components of deferred revenue, including long-term deferred revenue (in thousands): March 31, December 31, Deferred extended warranty revenue 2,901 2,902 Deferred training revenue 3,408 3,115 Other deferred revenue 4,542 1,891 Total deferred revenue $ 10,851 $ 7,908
Schedule of Product Warranty Accrual	Changes in product warranty accrual was as follows (in thousands): Three Months Ended March 31, 2016 2015 Balance at the beginning of the period $ 527 $ 569 Settlements of warranties (225 ) (100 ) Provision 750 (29 ) Balance at the end of the period $ 1,052 $ 440 Changes in the Company's deferred revenue, including long-term deferred revenue, related to extended warranties were as follows (in thousands): March 31, March 31, Balance at the beginning of the period $ 2,902 $ 3,272 Extended warranties issued 1,004 732 Amortization (1,005 ) (789 ) Balance at the end of the period $ 2,901 $ 3,215

Intangible Asset, Net (Tables)

Intangible Asset, Net (Tables)	3 Months Ended
	Mar. 31, 2016
Goodwill and Intangible Assets Disclosure [Abstract]
Schedule of Intangible Assets, Net	Intangible asset, net comprised the following (in thousands): March 31, December 31, Purchased technology $ 8,050 $ 8,050 Less: Accumulated amortization (3,120 ) (2,958 ) Intangible asset, net $ 4,930 $ 5,092
Schedule of Total Estimated Annual Future Amortization Expense	The total estimated annual future amortization expense of this intangible asset as of March 31, 2016 , is as follows (in thousands): Fiscal Year 2016 (remaining 9 months) $ 488 2017 650 2018 650 2019 650 2020 650 Thereafter 1,842 Total $ 4,930

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 under the Company's non-cancellable operating leases as of March 31, 2016 are as follows (in thousands): Year Ending December 31, Amount 2016 (remaining 9 months) $ 1,804 2017 2,182 2018 2,040 2019 896 2020 529 Thereafter 408 Total future minimum lease payments $ 7,859
Schedule of Capital Leased Assets	Property and equipment includes amounts under leases that have been capitalized as follows (dollars in thousands): Useful life (Years) March 31, 2016 December 31, Computer equipment 3 $ 382 $ 382 Total capital leased equipment 382 382 Less: Accumulated depreciation and amortization (181 ) (149 ) Capital leased equipment, net $ 201 $ 233
Schedule of Future Minimum Payments Required Under Capital Leases	Future minimum payments required under capital leases as of March 31, 2016 , are as follows (in thousands): Year Ending March 31, Amount 2016 (remaining 9 months) $ 99 2017 141 Total future payments $ 240 Less: Amount representing interest $ 9 Present value of future minimum payments 231 Less: Current portion 125 Long term portion $ 106

Stock-Based Compensation Expe22

Stock-Based Compensation Expense (Tables)	3 Months Ended
	Mar. 31, 2016
Disclosure of Compensation Related Costs, Share-based Payments [Abstract]
Stock Options Activity	A summary of share-based awards available for grant is as follows: Shares Available for Grant Balance, December 31, 2015 3,517,305 Additional shares reserved 1,000,000 Options granted (302,226 ) Restricted stock units granted (379,569 ) Options canceled 217 Restricted stock units canceled 39,189 Restricted stock units withheld for tax 112,546 Balance, March 31, 2016 3,987,462 Stock Option Awards A summary of the stock option activity is as follows: Options Outstanding Number of Stock Options Outstanding Weighted- Average Exercise Price Balance, December 31, 2015 2,641,592 $ 6.86 Options granted 302,226 22.25 Options exercised (6,594 ) 5.67 Options canceled (217 ) 6.38 Balance, March 31, 2016 2,937,007 $ 8.44
Restricted Stock Activity	Activity related to restricted stock units and awards is set forth below: Number of Units and Awards Weighted- Balance, December 31, 2015 1,312,651 $ 19.09 Restricted stock units granted 379,569 22.79 Restricted stock units vested (308,634 ) 24.17 Restricted stock units canceled (39,189 ) 23.49 Balance, March 31, 2016 1,344,397 $ 20.82
Stock-based Compensation Expense	Stock-based compensation related to all of the Company's stock-based awards and employee stock purchases was recorded as an expense or a reduction to revenue and are categorized as follows (in thousands): Three Months Ended March 31, 2016 2015 Revenue $ — $ 80 Cost of revenue 232 134 Research and development 501 350 Sales and marketing 1,383 1,551 General and administrative 2,086 2,035 Total stock-based compensation $ 4,202 $ 4,150
Summary of Fair Value of Employee Stock Option Assumptions	The fair value of employee stock options was estimated using the following weighted-average assumptions: Three Months Ended March 31, 2016 2015 Expected term (in years) 4.8 4.8 Expected volatility 63 % 63 % Risk-free interest rate 1.21 % 1.29 % Expected dividend yield — % — %

Net Loss Per Share (Tables)

Net Loss Per Share (Tables)	3 Months Ended
	Mar. 31, 2016
Earnings Per Share [Abstract]
Schedule of Earnings Per Share, Basic and Diluted	A reconciliation of the numerator and denominator used in the calculation of the basic and diluted net loss per share is as follows: Three Months Ended March 31, 2016 2015 Numerator Net loss (in thousands) $ (9,870 ) $ (2,129 ) Denominator Weighted average shares of common stock outstanding used in computing net loss per share, basic 39,288,853 38,383,022 Dilutive effect of incremental shares and share equivalents — — Weighted average shares of common stock outstanding used in computing net loss per share, diluted 39,288,853 38,383,022 Net loss per share: Net loss per share, basic and diluted $ (0.25 ) $ (0.06 )
Schedule of Antidilutive Securities Excluded from Computation of Earnings Per Share	The following outstanding potentially dilutive securities were excluded from the computation of diluted net loss per share of common stock for the periods presented, because including them would have been anti-dilutive: Three Months Ended March 31, 2016 2015 Options to purchase common stock 2,937,007 3,025,095 Restricted stock units 1,344,397 1,498,245 Common stock issuable pursuant to the ESPP — 8,874 Total 4,281,404 4,532,214

Segment Information (Tables)

Segment Information (Tables)	3 Months Ended
	Mar. 31, 2016
Segment Reporting [Abstract]
Revenue By Geographic Region	The Company’s revenue by geographic region, based on the location to where the product was shipped, is summarized as follows (in thousands): Three Months Ended March 31, 2016 2015 North America $ 51,469 $ 35,229 International 13,000 16,329 Total $ 64,469 $ 51,558
Revenue By Product	The following table sets forth revenue by product (in thousands): Three Months Ended March 31, 2016 2015 System revenue $ 24,689 $ 26,156 Consumable revenue 39,780 25,402 Total $ 64,469 $ 51,558

Basis of Presentation and Sum25

Basis of Presentation and Summary of Significant Accounting Policies Out of Period Adjustment (Details) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2016	Mar. 31, 2015
Error Corrections and Prior Period Adjustments Restatement [Line Items]
Net loss	$ (9,870)	$ (2,129)
Cost of revenue	18,229	14,378
Operating Expenses	57,404	$ 38,874
Correcting Adjustment to Increase Cost of Revenue, Warranty Accrual and Reduction to Other Operating Expenses [Member] | Restatement Adjustment [Member]
Error Corrections and Prior Period Adjustments Restatement [Line Items]
Net loss	(200)
Cost of revenue	400
Operating Expenses	$ (200)

Basis of Presentation and Sum26

Basis of Presentation and Summary of Significant Accounting Policies (Details) - Customer Concentration Risk [Member]	3 Months Ended
	Mar. 31, 2016	Mar. 31, 2015
Accounts Receivable [Member]
Concentration Risk [Line Items]
Concentration Risk, Number	0
Concentration risk, percentage		10.00%
Total Revenue [Member]
Concentration Risk [Line Items]
Concentration Risk, Number	0
Concentration risk, percentage		11.00%

Fair Value of Financial Instr27

Fair Value of Financial Instruments (Details) - USD ($)	Mar. 31, 2016	Dec. 31, 2015
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Available-for-sale securities, fair value disclosure	$ 5,520,000
Assets, fair value disclosure	7,764,000	$ 17,699,000
Money Market Funds [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Cash equivalents, fair value disclosure	2,244,000	1,342,000
Short-term Investments [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Available-for-sale securities, fair value disclosure	4,663,000	12,867,000
Short-term Investments [Member] | U.S. Agency securities [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Available-for-sale securities, fair value disclosure	750,000	1,549,000
Short-term Investments [Member] | U.S. Treasury [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Available-for-sale securities, fair value disclosure	0	500,000
Short-term Investments [Member] | Corporate bonds [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Available-for-sale securities, fair value disclosure	3,913,000	7,763,000
Short-term Investments [Member] | Commercial Paper [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Available-for-sale securities, fair value disclosure	0	500,000
Short-term Investments [Member] | Certificates of deposit [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Available-for-sale securities, fair value disclosure	0	2,555,000
Long-term Investments [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Available-for-sale securities, fair value disclosure	857,000	3,490,000
Long-term Investments [Member] | U.S. Agency securities [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Available-for-sale securities, fair value disclosure	0	497,000
Long-term Investments [Member] | U.S. Treasury [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Available-for-sale securities, fair value disclosure		0
Long-term Investments [Member] | Corporate bonds [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Available-for-sale securities, fair value disclosure	612,000	874,000
Long-term Investments [Member] | Certificates of deposit [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Available-for-sale securities, fair value disclosure	245,000	2,119,000
Level 1 [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Assets, fair value disclosure	2,489,000	6,016,000
Level 1 [Member] | Money Market Funds [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Cash equivalents, fair value disclosure	2,244,000	1,342,000
Level 1 [Member] | Short-term Investments [Member] | U.S. Agency securities [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Available-for-sale securities, fair value disclosure	0	0
Level 1 [Member] | Short-term Investments [Member] | U.S. Treasury [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Available-for-sale securities, fair value disclosure	0	0
Level 1 [Member] | Short-term Investments [Member] | Corporate bonds [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Available-for-sale securities, fair value disclosure	0	0
Level 1 [Member] | Short-term Investments [Member] | Commercial Paper [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Available-for-sale securities, fair value disclosure	0	0
Level 1 [Member] | Short-term Investments [Member] | Certificates of deposit [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Available-for-sale securities, fair value disclosure	0	2,555,000
Level 1 [Member] | Long-term Investments [Member] | U.S. Agency securities [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Available-for-sale securities, fair value disclosure	0	0
Level 1 [Member] | Long-term Investments [Member] | Corporate bonds [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Available-for-sale securities, fair value disclosure	0	0
Level 1 [Member] | Long-term Investments [Member] | Certificates of deposit [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Available-for-sale securities, fair value disclosure	245,000	2,119,000
Level 2 [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Assets, fair value disclosure	5,275,000	11,683,000
Level 2 [Member] | Money Market Funds [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Cash equivalents, fair value disclosure	0	0
Level 2 [Member] | Short-term Investments [Member] | U.S. Agency securities [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Available-for-sale securities, fair value disclosure	750,000	1,549,000
Level 2 [Member] | Short-term Investments [Member] | U.S. Treasury [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Available-for-sale securities, fair value disclosure	0	500,000
Level 2 [Member] | Short-term Investments [Member] | Corporate bonds [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Available-for-sale securities, fair value disclosure	3,913,000	7,763,000
Level 2 [Member] | Short-term Investments [Member] | Commercial Paper [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Available-for-sale securities, fair value disclosure	0	500,000
Level 2 [Member] | Short-term Investments [Member] | Certificates of deposit [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Available-for-sale securities, fair value disclosure	0	0
Level 2 [Member] | Long-term Investments [Member] | U.S. Agency securities [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Available-for-sale securities, fair value disclosure	0	497,000
Level 2 [Member] | Long-term Investments [Member] | Corporate bonds [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Available-for-sale securities, fair value disclosure	612,000	874,000
Level 2 [Member] | Long-term Investments [Member] | Certificates of deposit [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Available-for-sale securities, fair value disclosure	0	0
Level 3 [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Assets, fair value disclosure	0	0
Liabilities, fair value disclosure	0	0
Level 3 [Member] | Money Market Funds [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Cash equivalents, fair value disclosure	0	0
Level 3 [Member] | Short-term Investments [Member] | U.S. Agency securities [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Available-for-sale securities, fair value disclosure	0	0
Level 3 [Member] | Short-term Investments [Member] | U.S. Treasury [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Available-for-sale securities, fair value disclosure	0	0
Level 3 [Member] | Short-term Investments [Member] | Corporate bonds [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Available-for-sale securities, fair value disclosure	0	0
Level 3 [Member] | Short-term Investments [Member] | Commercial Paper [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Available-for-sale securities, fair value disclosure	0	0
Level 3 [Member] | Short-term Investments [Member] | Certificates of deposit [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Available-for-sale securities, fair value disclosure	0	0
Level 3 [Member] | Long-term Investments [Member] | U.S. Agency securities [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Available-for-sale securities, fair value disclosure	0	0
Level 3 [Member] | Long-term Investments [Member] | Corporate bonds [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Available-for-sale securities, fair value disclosure	0	0
Level 3 [Member] | Long-term Investments [Member] | Certificates of deposit [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Available-for-sale securities, fair value disclosure	$ 0	$ 0

Balance Sheet Components - Inve

Balance Sheet Components - Investments (Details) - USD ($) $ in Thousands	Mar. 31, 2016	Dec. 31, 2015
Schedule of Available-for-sale Securities [Line Items]
Amortized Cost	$ 5,520
Fair Value	5,520
Short-term Investments [Member]
Schedule of Available-for-sale Securities [Line Items]
Amortized Cost	4,664	$ 12,882
Gross Unrealized Gains	1	0
Gross Unrealized Losses	(2)	(15)
Fair Value	4,663	12,867
Short-term Investments [Member] | U.S. Agency securities [Member]
Schedule of Available-for-sale Securities [Line Items]
Amortized Cost	750	1,551
Gross Unrealized Gains	0	0
Gross Unrealized Losses	0	(2)
Fair Value	750	1,549
Short-term Investments [Member] | U.S. Treasury [Member]
Schedule of Available-for-sale Securities [Line Items]
Amortized Cost	0	500
Gross Unrealized Gains	0	0
Gross Unrealized Losses	0	0
Fair Value	0	500
Short-term Investments [Member] | Corporate bonds [Member]
Schedule of Available-for-sale Securities [Line Items]
Amortized Cost	3,914	7,776
Gross Unrealized Gains	1	0
Gross Unrealized Losses	(2)	(13)
Fair Value	3,913	7,763
Short-term Investments [Member] | Commercial paper [Member]
Schedule of Available-for-sale Securities [Line Items]
Amortized Cost	0	500
Gross Unrealized Gains	0	0
Gross Unrealized Losses	0	0
Fair Value	0	500
Short-term Investments [Member] | Certificates of deposit [Member]
Schedule of Available-for-sale Securities [Line Items]
Amortized Cost	0	2,555
Gross Unrealized Gains	0	0
Gross Unrealized Losses	0	0
Fair Value	0	2,555
Long-term Investments [Member]
Schedule of Available-for-sale Securities [Line Items]
Amortized Cost	856	3,496
Gross Unrealized Gains	1	0
Gross Unrealized Losses	0	(6)
Fair Value	857	3,490
Long-term Investments [Member] | U.S. Agency securities [Member]
Schedule of Available-for-sale Securities [Line Items]
Amortized Cost	0	499
Gross Unrealized Gains	0	0
Gross Unrealized Losses	0	(2)
Fair Value	0	497
Long-term Investments [Member] | U.S. Treasury [Member]
Schedule of Available-for-sale Securities [Line Items]
Amortized Cost		0
Gross Unrealized Gains		0
Gross Unrealized Losses		0
Fair Value		0
Long-term Investments [Member] | Corporate bonds [Member]
Schedule of Available-for-sale Securities [Line Items]
Amortized Cost	611	878
Gross Unrealized Gains	1	0
Gross Unrealized Losses	0	(4)
Fair Value	612	874
Long-term Investments [Member] | Certificates of deposit [Member]
Schedule of Available-for-sale Securities [Line Items]
Amortized Cost	245	2,119
Gross Unrealized Gains	0	0
Gross Unrealized Losses	0	0
Fair Value	$ 245	$ 2,119

Balance Sheet Components - In29

Balance Sheet Components - Investments, Contractual Maturities (Details) $ in Thousands	Mar. 31, 2016USD ($)
Organization, Consolidation and Presentation of Financial Statements [Abstract]
Amortized Cost, Due in one year or less	$ 4,664
Amortized Cost, Due in one year to five years	856
Amortized Cost	5,520
Fair Value, Due in one year or less	4,663
Fair Value, Due in one year to five years	857
Fair Value	$ 5,520

Balance Sheet Components - In30

Balance Sheet Components - Inventory (Details) - USD ($) $ in Thousands	Mar. 31, 2016	Dec. 31, 2015
Inventory, Net [Abstract]
Raw materials	$ 10,698	$ 9,117
Finished goods	21,864	18,978
Total inventory	$ 32,562	$ 28,095

Balance Sheet Components - Prop

Balance Sheet Components - Property and Equipment, Net (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	$ 11,635		$ 10,659
Less: Accumulated depreciation and amortization	(6,179)		(5,635)
Property and equipment, net	7,511		6,969
Property and equipment acquired under capital leases	382		382
Depreciation expense	500	$ 300
Lab equipment, tooling and molds [Member]
Property, Plant and Equipment [Line Items]
Property, plant and equipment, gross	3,375		3,228
Computer software [Member]
Property, Plant and Equipment [Line Items]
Property, plant and equipment, gross	2,499		2,019
Computer equipment [Member]
Property, Plant and Equipment [Line Items]
Property, plant and equipment, gross	2,844		2,757
Property and equipment acquired under capital leases	382		382
Leasehold improvements [Member]
Property, Plant and Equipment [Line Items]
Property, plant and equipment, gross	1,825		1,670
Furniture and fixtures [Member]
Property, Plant and Equipment [Line Items]
Property, plant and equipment, gross	1,057		950
Vehicles [Member]
Property, Plant and Equipment [Line Items]
Property, plant and equipment, gross	35		35
Construction in Progress [Member]
Property, Plant and Equipment [Line Items]
Property, plant and equipment, gross	$ 2,055		$ 1,945

Balance Sheet Components - Accr

Balance Sheet Components - Accrued Liabilities (Details) - USD ($) $ in Thousands	Mar. 31, 2016	Dec. 31, 2015
Organization, Consolidation and Presentation of Financial Statements [Abstract]
Accrued payroll and employee related expenses	$ 9,506	$ 14,887
Accrued marketing expenses	6,157	5,554
Accrued royalty	4,693	5,453
Sales and other taxes payable	3,507	3,703
Advance payments from customers	864	1,585
Accrued warranty	1,052	527
Accrued legal expenses	2,527	1,465
Other	3,020	1,517
Total accrued and other current liabilities	$ 31,326	$ 34,691

Balance Sheet Components - Defe

Balance Sheet Components - Deferred Revenue (Details) - USD ($) $ in Thousands	Mar. 31, 2016	Dec. 31, 2015
Deferred Revenue Disclosure [Abstract]
Deferred extended warranty revenue	$ 2,901	$ 2,902
Deferred training revenue	3,408	3,115
Other deferred revenue	4,542	1,891
Total deferred revenue	$ 10,851	$ 7,908

Balance Sheet Components - Prod

Balance Sheet Components - Product Warranty (Details) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2016	Mar. 31, 2015
Movement in Extended Product Warranty Accrual [Roll Forward]
Balance at the beginning of the period	$ 2,902	$ 3,272
Extended warranties issued	1,004	732
Amortization	(1,005)	(789)
Balance at the end of the period	2,901	3,215
Movement in Standard Product Warranty Accrual [Roll Forward]
Balance at the beginning of the period	527	569
Settlements of warranties	(225)	(100)
Provision	750	(29)
Balance at the end of the period	$ 1,052	$ 440
Direct Customer [Member] | Control Units [Member]
Movement in Extended Product Warranty Accrual [Roll Forward]
Product warranty term	1 year
Direct Customer [Member] | Applicators [Member]
Movement in Extended Product Warranty Accrual [Roll Forward]
Product warranty term	1 year
International [Member] | Indirect Customer [Member] | Control Units [Member]
Movement in Extended Product Warranty Accrual [Roll Forward]
Product warranty term	3 years 2 months
International [Member] | Indirect Customer [Member] | Applicators [Member]
Movement in Extended Product Warranty Accrual [Roll Forward]
Product warranty term	1 year 2 months

Intangible Asset, Net (Details)

Intangible Asset, Net (Details) - USD ($) $ in Millions	3 Months Ended
	Mar. 31, 2016	Mar. 31, 2015
Goodwill and Intangible Assets Disclosure [Abstract]
Amortization of intangible assets	$ 0.2	$ 0.2

Intangible Asset, Net - Intangi

Intangible Asset, Net - Intangible Asset, Net Comprises (Details) - USD ($) $ in Thousands	Mar. 31, 2016	Dec. 31, 2015
Goodwill and Intangible Assets Disclosure [Abstract]
Purchased technology	$ 8,050	$ 8,050
Less: Accumulated amortization	(3,120)	(2,958)
Intangible asset, net	$ 4,930	$ 5,092

Intangible Asset, Net - Estimat

Intangible Asset, Net - Estimated Annual Future Amortization Expense (Details) - USD ($) $ in Thousands	Mar. 31, 2016	Dec. 31, 2015
Intangible Asset, Net, Amortization Expense, Fiscal Year Maturity [Abstract]
2016 (remaining 9 months)	$ 488
2,017	650
2,018	650
2,019	650
2,020	650
Thereafter	1,842
Intangible asset, net	$ 4,930	$ 5,092

Related Party Transactions (Det

Related Party Transactions (Details) - USD ($) $ in Millions	3 Months Ended
	Mar. 31, 2016	Mar. 31, 2015	Dec. 31, 2015
Related Party Transaction [Line Items]
Related party payment terms	180 days
Distributor [Member]
Related Party Transaction [Line Items]
Revenue from related parties	$ 0.9	$ 1.3
Accounts receivable, related parties			$ 1.7

Commitments and Contingencies -

Commitments and Contingencies - Operating Lease Obligations (Details) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2016	Mar. 31, 2015
Commitments and Contingencies Disclosure [Abstract]
Rent expense	$ 600	$ 500
Operating Leases, Future Minimum Payments Due, Fiscal Year Maturity [Abstract]
2016 (remaining 9 months)	1,804
2,017	2,182
2,018	2,040
2,019	896
2,020	529
Thereafter	408
Total future minimum lease payments	$ 7,859

Commitments and Contingencies40

Commitments and Contingencies - Capital Lease Obligations (Details) - USD ($) $ in Thousands	3 Months Ended		12 Months Ended
	Mar. 31, 2016	Mar. 31, 2015	Dec. 31, 2015
Capital Leased Assets [Line Items]
Capital leased equipment, gross	$ 382		$ 382
Less: Accumulated depreciation and amortization	(181)		(149)
Capital leased equipment, net	201		233
Amortization of assets acquired under capital leases	32	$ 32
Future minimum payments under capital leases
2016 (remaining 9 months)	99
2,017	141
Total future payments	240
Less: Amount representing interest	9
Present value of future minimum payments	231
Less: Current portion	125		124
Long term portion	$ 106		$ 138
Computer equipment [Member]
Capital Leased Assets [Line Items]
Useful life (Years)	3 years		3 years
Capital leased equipment, gross	$ 382		$ 382

Commitments and Contingencies41

Commitments and Contingencies - Purchase Commitments and Unrecognized Tax Benefits (Details) - USD ($) $ in Millions	3 Months Ended
	Mar. 31, 2016	Dec. 31, 2015
Commitments and Contingencies Disclosure [Abstract]
Purchase obligation	$ 4.1	$ 5.9
Unrecognized tax benefits, including estimated interest and penalties	0.3
Self-Insured Product Liability Claims Paid	0.9
Self Insurance Reserve	$ 1.8	$ 1.1

Commitments And Contingencies42

Commitments And Contingencies - Separation Agreements (Details) - Management [Member] - USD ($) $ in Millions	3 Months Ended		4 Months Ended
	Jun. 30, 2016	Mar. 31, 2016	Jun. 30, 2016
Loss Contingencies [Line Items]
Termination benefits		$ 0.3
Stock-based compensation expense due to modification		$ 0.8
Scenario, Forecast [Member]
Loss Contingencies [Line Items]
Stock-based compensation expense due to modification	$ 0.3		$ 1.1

Stock-Based Compensation Expe43

Stock-Based Compensation Expense - Stock Options Plan Activity (Details) - $ / shares	3 Months Ended
	Mar. 31, 2016	Mar. 31, 2015
Shares Available for Grant
Balance at beginning of period (Shares)	3,517,305
Additional shares reserved (Shares)	1,000,000
Options granted (Shares)	(302,226)
Options canceled (Shares)	217
Balance at end of period (Shares)	3,987,462
Number of Stock Options Outstanding
Balance at beginning of period (Number of Stock Options Outstanding) (Shares)	2,641,592
Options granted (Shares)	302,226
Options exercised (Number of stock options outstanding) (Shares)	(6,594)
Options canceled (Number of Stock Options Outstanding) (Shares)	(217)
Balance at end of period (Number of Stock Options Outstanding) (Shares)	2,937,007
Weighted-Average Exercise Price
Balance at beginning of period (Weighted average exercise price) (Per Share)	$ 6.86
Options granted (Weighted average exercise price) (Per Share)	22.25
Options exercised (Weighted average exercise price) (Per Share)	5.67
Options canceled (Weighted average exercise price) (Per Share)	6.38
Balance at end of period (Weighted average exercise price) (Per Share)	$ 8.44
Restricted Stock Units (RSUs) [Member]
Shares Available for Grant
Restricted stock units granted (Shares)	(379,569)
Restricted stock units canceled (Shares)	39,189
Restricted stock units withheld for tax (Shares)	112,546	133,035

Stock-Based Compensation Expe44

Stock-Based Compensation Expense - Restricted Stock Units (Details) - USD ($) $ / shares in Units, $ in Thousands	3 Months Ended
	Mar. 31, 2016	Mar. 31, 2015
Weighted- Average Grant Date Fair Value
Payments for employee's tax obligations to relevant taxing authority	$ 2,651	$ 4,345
Restricted Stock Units (RSUs) [Member]
Number of Units and Awards
Balance at beginning of period (Shares)	1,312,651
Restricted stock units granted (Shares)	379,569
Restricted stock units vested (Shares)	(308,634)	(330,201)
Restricted stock units canceled (Shares)	(39,189)
Balance at end of period (Shares)	1,344,397
Weighted- Average Grant Date Fair Value
Balance at beginning of period (Weighted average exercise price) (Per Share)	$ 19.09
Restricted stock units granted (Weighted average exercise price) (Per Share)	22.79
Restricted stock units vested (Weighted average exercise price) (Per Share)	24.17
Restricted stock units canceled (Weighted average exercise price) (Per Share)	23.49
Balance at end of period (Weighted average exercise price) (Per Share)	$ 20.82
Restricted stock units withheld for tax (Shares)	112,546	133,035
Payments for employee's tax obligations to relevant taxing authority	$ 2,600	$ 4,300

Stock-Based Compensation Expe45

Stock-Based Compensation Expense - Allocation of Stock Based Compensation Expense (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	$ 4,202	$ 4,150
Options granted (Shares)	302,226
Revenue [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Stock-based compensation expense	$ 0	80
Cost of Revenue [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Stock-based compensation expense	232	134
Research and Development [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Stock-based compensation expense	501	350
Sales and Marketing [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Stock-based compensation expense	1,383	1,551
General and Administrative [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Stock-based compensation expense	2,086	$ 2,035
Stock Compensation Plan [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Unrecognized compensation cost	$ 26,200
Unrecognized compensation cost, recognition period (in years)	2 years 11 months
Options granted (Shares)	302,226	45,622
Performance Based Restricted Stock Units [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Options granted (Shares)	40,000	40,000
Performance Based Stock Options and Restricted Stock Units [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Stock-based compensation expense	$ 400	$ 1,500
Minimum [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Vesting percentage	0.00%
Maximum [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Vesting percentage	100.00%

Stock-Based Compensation Expe46

Stock-Based Compensation Expense - Assumptions (Details) - Stock Options [Member]	3 Months Ended
	Mar. 31, 2016	Mar. 31, 2015
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Expected term	4 years 9 months 20 days	4 years 9 months 20 days
Expected volatility	63.00%	63.00%
Risk-free interest rate	1.21%	1.29%
Expected dividend yield	0.00%	0.00%

Stock-Based Compensation Expe47

Stock-Based Compensation Expense - Employee Stock-Based Compensation (Details) - USD ($) $ / shares in Units, $ in Millions	3 Months Ended
	Mar. 31, 2016	Mar. 31, 2015
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Options granted (Shares)	302,226
Stock Compensation Plan [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Options granted (Shares)	302,226	45,622
Weighted average grant date fair value (Per Share)	$ 22.25	$ 18.19
Unrecognized compensation cost, recognition period (in years)	2 years 11 months
Employee Restricted Stock Units (RSUs) [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Restricted stock units granted (Shares)	379,569	353,757
Weighted average grant date fair value (Per Share)	$ 22.79	$ 31.95
ESPP [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Unrecognized compensation cost	$ 0.2
Unrecognized compensation cost, recognition period (in years)	2 months
Performance Based Restricted Stock Units [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Options granted (Shares)	40,000	40,000

Stock-Based Compensation Expe48

Stock-Based Compensation Expense - Non-Employee Stock-Based Compensation (Details) $ in Millions	3 Months Ended
	Mar. 31, 2015USD ($)
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Stock-based compensation expense related to non-employee grants	$ 0.1

Net Loss Per Share (Details)

Net Loss Per Share (Details) - USD ($) $ / shares in Units, $ in Thousands	3 Months Ended
	Mar. 31, 2016	Mar. 31, 2015
Numerator
Net loss	$ (9,870)	$ (2,129)
Denominator
Weighted Average Number of Shares Outstanding, Basic and Diluted	39,288,853	38,383,022
Dilutive effect of incremental shares and share equivalents	0	0
Weighted average shares of common stock outstanding used in computing net loss per share, diluted	39,288,853	38,383,022
Net loss per share:
Net loss per share, basic and diluted	$ (0.25)	$ (0.06)

Net Loss Per Share - Outstandin

Net Loss Per Share - Outstanding Shares of Potentially Dilutive Securities (Details) - shares	3 Months Ended
	Mar. 31, 2016	Mar. 31, 2015
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items]
Antidilutive securities excluded from computation of earnings per share, amount (in shares)	4,281,404	4,532,214
Options to purchase common stock [Member]
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items]
Antidilutive securities excluded from computation of earnings per share, amount (in shares)	2,937,007	3,025,095
Restricted Stock Units (RSUs) [Member]
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items]
Antidilutive securities excluded from computation of earnings per share, amount (in shares)	1,344,397	1,498,245
Common stock issuable pursuant to the ESPP [Member]
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items]
Antidilutive securities excluded from computation of earnings per share, amount (in shares)	0	8,874

Income Taxes (Details)

Income Taxes (Details) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2016	Mar. 31, 2015
Income Tax Disclosure [Abstract]
Provision for (benefit from) income taxes	$ (684)	$ 28
Unrecognized tax benefits	$ 3,200

Segment Information (Details)

Segment Information (Details) $ in Thousands	3 Months Ended
	Mar. 31, 2016USD ($)business_activitysegmentmanager	Mar. 31, 2015USD ($)
Segment Reporting Information [Line Items]
Number of business activities | business_activity	1
Number of reportable segments | segment	1
Number of segment managers held accountable for operations | manager	0
Revenue, net	$ 64,469	$ 51,558
North America [Member]
Segment Reporting Information [Line Items]
Revenue, net	51,469	35,229
United States [Member]
Segment Reporting Information [Line Items]
Revenue, net	51,300	33,200
International [Member]
Segment Reporting Information [Line Items]
Revenue, net	13,000	16,329
Systems Revenue [Member]
Segment Reporting Information [Line Items]
Revenue, net	24,689	26,156
Consumable Revenue [Member]
Segment Reporting Information [Line Items]
Revenue, net	$ 39,780	$ 25,402