ZELTIQ Aesthetics (ZLTQ) 10-Q 30 Jul 15 2015 Q2 Quarterly report Financial data

Document and Entity Information

Document and Entity Information - shares	6 Months Ended
	Jun. 30, 2015	Jul. 24, 2015
Document and Entity Information [Abstract]
Document Type	10-Q
Amendment Flag	false
Document Period End Date	Jun. 30, 2015
Document Fiscal Year Focus	2,015
Document Fiscal Period Focus	Q2
Entity Registrant Name	Zeltiq Aesthetics Inc
Entity Central Index Key	1,415,336
Current Fiscal Year End Date	--12-31
Entity Filer Category	Accelerated Filer
Entity Common Stock, Shares Outstanding		38,756,476

Condensed Consolidated Balance

Condensed Consolidated Balance Sheets - USD ($) $ in Thousands	Jun. 30, 2015	Dec. 31, 2014
CURRENT ASSETS:
Cash and cash equivalents	$ 37,306	$ 28,649
Short-term investments	11,404	16,286
Accounts receivable, net	30,700	21,472
Inventory	18,372	15,536
Prepaid expenses and other current assets	6,239	7,060
Total current assets	104,021	89,003
Long-term investments	4,363	4,805
Restricted cash	563	560
Property and equipment, net	4,186	3,724
Intangible asset, net	5,430	5,780
Other assets	147	33
Total assets	118,710	103,905
CURRENT LIABILITIES:
Accounts payable	8,340	5,824
Accrued liabilities	26,981	21,450
Deferred revenue	8,027	5,069
Current portion of capital lease obligations	122	120
Total current liabilities	43,470	32,463
Long-term deferred revenue	313	622
Long-term capital lease obligations, less current portion	201	262
Other non-current liabilities	476	39
Total liabilities	$ 44,460	$ 33,386
Commitments and contingencies
STOCKHOLDERS’ EQUITY:
Preferred stock, $0.01 par value: 50,000,000 shares authorized and no shares issued and outstanding at June 30, 2015, and December 31, 2014	$ 0	$ 0
Common stock, $0.001 par value: 500,000,000 shares authorized at June 30, 2015, and December 31, 2014; 38,741,143 and 38,123,998 shares issued and outstanding at June 30, 2015, and December 31, 2014, respectively	42	42
Additional paid-in capital	207,168	202,701
Accumulated other comprehensive income (loss)	(481)	(696)
Accumulated deficit	(132,479)	(131,528)
Total stockholders’ equity	74,250	70,519
Total liabilities and stockholders’ equity	$ 118,710	$ 103,905

Condensed Consolidated Balance3

Condensed Consolidated Balance Sheets (Parenthetical) - $ / shares	Jun. 30, 2015	Dec. 31, 2014
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	38,741,143	38,123,998
Common stock, shares outstanding	38,741,143	38,123,998

Condensed Consolidated Statemen

Condensed Consolidated Statements of Operations - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2015	Jun. 30, 2014	Jun. 30, 2015	Jun. 30, 2014
Income Statement [Abstract]
Revenue	$ 64,431	$ 47,061	$ 115,989	$ 78,036
Cost of revenue	18,116	13,660	32,494	22,676
Gross profit	46,315	33,401	83,495	55,360
Operating expenses:
Research and development	5,809	4,350	11,889	8,620
Sales and marketing	32,199	21,052	56,605	41,239
General and administrative	6,654	5,234	15,042	9,947
Total operating expenses	44,662	30,636	83,536	59,806
Income (loss) from operations	1,653	2,765	(41)	(4,446)
Interest income, net	13	14	26	33
Other expense, net	(445)	(83)	(865)	(149)
Income (loss) before income taxes	1,221	2,696	(880)	(4,562)
Income tax expense (benefit)	43	(73)	71	6
Net income (loss)	$ 1,178	$ 2,769	$ (951)	$ (4,568)
Basic net income (loss) per share:
Net income (loss) per share, basic (dollars per share)	$ 0.03	$ 0.07	$ (0.02)	$ (0.12)
Weighted average shares of common stock outstanding used in computing net income (loss) per share, basic (shares)	38,649,873	37,440,537	38,517,817	37,328,738
Diluted net income (loss) per share:
Net income (loss) per share, diluted (dollars per share)	$ 0.03	$ 0.07	$ (0.02)	$ (0.12)
Weighted average shares of common stock outstanding used in computing net income (loss) per share, diluted (shares)	41,641,660	40,597,275	38,517,817	37,328,738

Condensed Consolidated Stateme5

Condensed Consolidated Statements of Comprehensive Income (Loss) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2015	Jun. 30, 2014	Jun. 30, 2015	Jun. 30, 2014
Statement of Comprehensive Income [Abstract]
Net income (loss)	$ 1,178	$ 2,769	$ (951)	$ (4,568)
Other comprehensive income, net of tax:
Foreign currency translation adjustments	798	149	210	179
Changes in unrealized gains (losses) on available-for-sale securities	0	(6)	5	(4)
Other comprehensive income, net of tax	798	143	215	175
Comprehensive income (loss)	$ 1,976	$ 2,912	$ (736)	$ (4,393)

Condensed Consolidated Stateme6

Condensed Consolidated Statements of Cash Flows - USD ($) $ in Thousands	6 Months Ended
	Jun. 30, 2015	Jun. 30, 2014
CASH FLOWS FROM OPERATING ACTIVITIES:
Net income (loss)	$ (951)	$ (4,568)
Adjustments to reconcile net loss to net cash provided by (used in) operating activities:
Depreciation and amortization	1,062	932
Stock-based compensation	7,233	4,511
Deferred income taxes	0	38
Amortization (accretion) of investment premium (discount), net	44	126
Provision for doubtful accounts receivable	158	145
Provision for excess and obsolete inventory	253	325
Loss on disposal and write-off of property and equipment	0	17
Changes in operating assets and liabilities:
Accounts receivable	(9,414)	(3,781)
Inventory	(2,994)	(9,781)
Prepaid expenses and other assets	707	2,022
Deferred revenue, net of deferred costs	2,645	2,099
Accounts payable, accrued and other non-current liabilities	8,487	(2,416)
Net cash provided by (used in) operating activities	7,230	(10,331)
CASH FLOWS FROM INVESTING ACTIVITIES:
Purchase of investments	(6,024)	(4,513)
Proceeds from sale of investments	0	1,000
Proceeds from maturity of investments	11,310	10,634
Purchase of property and equipment	(1,188)	(770)
Change in restricted cash	1	(1)
Net cash provided by investing activities	4,099	6,350
CASH FLOWS FROM FINANCING ACTIVITIES:
Principal payments on capital leases	(59)	0
Proceeds from issuance of common stock upon exercise of stock options and from employee stock purchase program	2,816	1,587
Tax payments related to shares withheld for vested restricted stock units	(5,599)	(3,247)
Tax effect of employee stock plans	17	15
Net cash used in financing activities	(2,825)	(1,645)
Effect of exchange rate changes on cash and cash equivalents	153	90
NET INCREASE (DECREASE) IN CASH AND CASH EQUIVALENTS	8,657	(5,536)
CASH AND CASH EQUIVALENTS—Beginning of period	28,649	25,798
CASH AND CASH EQUIVALENTS—End of period	$ 37,306	$ 20,262

Basis of Presentation and Summa

Basis of Presentation and Summary of Significant Accounting Policies	6 Months Ended
	Jun. 30, 2015
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, 2014 , 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 June 30, 2015 , results of operations for the three and six months ended June 30, 2015 and 2014 , comprehensive income (loss) for the three and six months ended June 30, 2015 and 2014 , and cash flows for the six months ended June 30, 2015 and 2014 . The interim results for the three and six months ended June 30, 2015 , are not necessarily indicative of the results that may be expected for the year ending December 31, 2015 , or for any other future annual or interim period. Certain amounts in the prior year's condensed consolidated balance sheet have been reclassified to conform to the current period's presentation. These reclassifications had no impact on previously reported condensed consolidated statements of cash flows or statements of operations. 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, 2014 . Out of period adjustment During the three months ended June 30, 2015 , the Company recorded and corrected an adjustment related to inventory that served to increase cost of revenue by $0.2 million . The adjustment to cost of revenue and inventory resulted from the reserve and write-off of certain inventory held by vendors starting in the fiscal year ended December 31, 2011 through the first quarter of 2015. Of the total amount of this adjustment to cost of revenue, $0.1 million related to the fiscal year ending December 31, 2012 , $23,000 related to the fiscal year ended December 31, 2013 and $42,000 related to the fiscal year ended December 31, 2014 . The error caused the overstatement of inventory and the understatement of cost of revenue in prior periods. The Company does not believe that such amounts are material to current and previously reported consolidated financial statements. 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 respective local 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 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 June 30, 2015 , one individual customer, which is a large aesthetic chain, accounted for 30% of accounts receivable. As of June 30, 2014 , no individual customer accounted for 10% or more of the Company's accounts receivable. During the three and six months ended June 30, 2015 , one individual customer accounted for 17% and 14% of total revenue, respectively. During the three and six months ended June 30, 2014 , no individual customer accounted for 10% or more of total revenue. Critical Accounting Policies There have been no material changes to the Company’s critical accounting policies during the six months ended June 30, 2015 , as compared to the critical accounting policies described in the Company’s Annual Report on Form 10-K for the year ended December 31, 2014 . 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. 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 will 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 the consolidated financial statements and related disclosures. In August 2014 , the FASB issued Accounting Standards Update No. 2014-15, Disclosure of Uncertainties About an Entity's Ability to Continue as a Going Concern. This standard update provides guidance around management's responsibility to evaluate whether there is substantial doubt about an entity's ability to continue as a going concern and to provide related footnote disclosures. The new guidance is effective for all annual and interim periods ending after December 15, 2016 . The new guidance will not have an impact on the Company's consolidated financial statements. In April 2015 , the FASB issued Accounting Standards Update No. 2015-05 regarding Subtopic 350-40, “Intangibles - Goodwill and Other - Internal-Use Software.” This standard provides guidance to customers about whether a cloud computing arrangement includes a software license. If a cloud computing arrangement includes a software license, the customer should account for the software license element of the arrangement consistent with other software licenses. If a cloud computing arrangement does not include a software license, the customer should account for the arrangement as a service contract. The amendments are effective for annual and interim periods beginning after December 15, 2015 . Early adoption is permitted. The amendments may be applied either prospectively to all arrangements entered into or materially modified after the effective date or retrospectively. The Company is currently evaluating the impact this new guidance will have on the consolidated financial statements and related disclosures. In June 2015 , the FASB issued Accounting Standards Update No. 2015-10, Technical Corrections and Improvements. The standard covers a wide range of Topics in the Codification. The amendments in this standard represent changes to clarify the Codification, correct unintended application of guidance, or make minor improvements to the Codification that are not expected to have a significant effect on current accounting practice or create a significant administrative cost on most entities. The amendments are effective for fiscal years and interim periods within those fiscal years, beginning after December 15, 2015 . The Company does not anticipate that the adoption of this standard will have a material impact on its consolidated financial statements and footnote disclosures. The Company is currently evaluating the impact this new guidance will have on the consolidated financial statements and related disclosures.

Fair Value of Financial Instrum

Fair Value of Financial Instruments	6 Months Ended
	Jun. 30, 2015
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 Company did not hold any Level 3 assets or liabilities at June 30, 2015 . 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 June 30, 2015 Level 1 Level 2 Level 3 Fair Value Financial Assets Cash equivalents: Money market funds $ 5,930 $ — $ — $ 5,930 Short-term investments: U.S. Agency securities — 3,251 — 3,251 U.S. Treasury — 501 — 501 Corporate bonds — 6,472 — 6,472 Certificates of deposit 1,180 — — 1,180 Long-term investments: U.S. Agency securities — 600 — 600 Corporate bonds — 1,207 — 1,207 Certificates of deposit 2,556 — — 2,556 Total $ 9,666 $ 12,031 $ — $ 21,697 As of December 31, 2014 Level 1 Level 2 Level 3 Fair Value Financial Assets Cash equivalents: Money market funds $ 6,062 $ — $ — $ 6,062 Short-term investments: U.S. Agency securities — 5,240 — 5,240 U.S. Treasury — 1,004 — 1,004 Corporate bonds — 7,774 — 7,774 Commercial paper — 1,349 — 1,349 Certificates of deposit 919 — — 919 Long-term investments: U.S. Agency securities — 999 — 999 U.S. Treasury — 500 — 500 Corporate bonds — 750 — 750 Certificates of deposit 2,556 — — 2,556 Total $ 9,537 $ 17,616 $ — $ 27,153 During the three and six months ended June 30, 2015 and 2014 , the Company did not have any transfers of financial assets measured at fair value on a recurring basis to or from Level 1, Level 2 or Level 3. The Company did not hold any Level 3 assets or liabilities as of June 30, 2015 , and December 31, 2014 . The carrying amounts of the Company’s cash equivalents, accounts receivable, accounts payable and accrued liabilities, approximate fair value due to their relatively short maturities.

Balance Sheet Components

Balance Sheet Components	6 Months Ended
	Jun. 30, 2015
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 June 30, 2015 , are as follows (in thousands): Short-term Amortized Cost Gross Unrealized Gains Gross Unrealized Losses Fair Value U.S. Agency securities $ 3,251 $ — $ — $ 3,251 U.S. Treasury 500 1 — 501 Corporate bonds 6,474 1 (3 ) 6,472 Certificates of deposit 1,180 — — 1,180 Total $ 11,405 $ 2 $ (3 ) $ 11,404 Long-term Amortized Cost Gross Unrealized Gains Gross Unrealized Losses Fair Value U.S. Agency securities $ 600 $ — $ — $ 600 Corporate bonds 1,208 — (1 ) 1,207 Certificates of deposit 2,556 — — 2,556 Total $ 4,364 $ — $ (1 ) $ 4,363 The Company's short-term and long-term investments as of December 31, 2014 , are as follows (in thousands): Short-term Amortized Cost Gross Unrealized Gains Gross Unrealized Losses Fair Value U.S. Agency securities $ 5,240 $ 1 $ (1 ) $ 5,240 U.S. Treasury 1,003 1 — 1,004 Corporate bonds 7,778 2 (6 ) 7,774 Commercial paper 1,349 — — 1,349 Certificates of deposit 919 — — 919 Total $ 16,289 $ 4 $ (7 ) $ 16,286 Long-term Amortized Cost Gross Unrealized Gains Gross Unrealized Losses Fair Value U.S. Agency securities $ 1,000 $ — $ (1 ) $ 999 U.S. Treasury 500 — — 500 Corporate bonds 752 — (2 ) 750 Certificates of deposit 2,556 — — 2,556 Total $ 4,808 $ — $ (3 ) $ 4,805 For each of the three and six months ended June 30, 2015 and 2014 , 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 June 30, 2015 , are as follows (in thousands): June 30, 2015 Amortized Cost Fair Value Due in one year or less $ 11,405 $ 11,404 Due in one year to five years 4,364 4,363 $ 15,769 $ 15,767 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, computed on a standard cost basis. 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, new production introductions and market conditions. The components of inventory consist of the following (in thousands): June 30, December 31, Raw materials $ 8,987 $ 7,692 Finished goods 9,385 7,844 Total inventory $ 18,372 $ 15,536 Property and equipment, net Property and equipment, net comprised the following (in thousands): June 30, December 31, Lab equipment, tooling and molds $ 2,959 $ 2,766 Computer software 2,081 1,337 Computer equipment 1,308 984 Leasehold improvements 1,525 1,452 Furniture and fixtures 681 494 Vehicles 35 35 Total property and equipment 8,589 7,068 Less: Accumulated depreciation and amortization (4,788 ) (4,111 ) Construction in progress 385 767 Property and equipment, net $ 4,186 $ 3,724 The table above includes property and equipment acquired under capital leases which totaled $0.4 million as of both June 30, 2015 and December 31, 2014 . Depreciation and amortization expense related to property and equipment was $0.4 million and $0.7 million for the three and six months ended June 30, 2015 , respectively. Depreciation and amortization expense related to property and equipment was $0.3 million and $0.6 million for the three and six months ended June 30, 2014 , respectively. Accrued Liabilities The following table shows the components of accrued liabilities (in thousands): June 30, December 31, Accrued payroll and employee related expenses $ 10,150 $ 8,386 Accrued marketing expenses 4,438 2,959 Accrued royalty 4,581 3,612 Sales and other taxes payable 2,222 2,123 Advance payments from customers 1,295 1,908 Accrued warranty 339 569 Accrued legal expenses 2,556 592 Other accrued liabilities 1,400 1,301 Total accrued liabilities $ 26,981 $ 21,450 Product Warranty The Company provides a standard limited warranty on its products of generally 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 three years for control units and one year for applicators. The Company accrues for the estimated future costs of repair or replacement upon shipment. Changes in the warranty accrual are recorded to cost of revenue and is based upon historical and forecasted 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 and projected product failure rates, and average repair costs, including freight, material, technical support labor, and overhead costs, for products returned under warranty. The product warranty accrual was as follows (in thousands): Three Months Ended Six Months Ended June 30, June 30, 2015 2014 2015 2014 Balance at the beginning of the period $ 440 $ 660 $ 569 $ 676 Change in accruals for warranties issued (134 ) 159 (163 ) 198 Settlements of warranty claims 33 (78 ) (67 ) (133 ) Balance at the end of the period $ 339 $ 741 $ 339 $ 741

Intangible Asset, Net

Intangible Asset, Net	6 Months Ended
	Jun. 30, 2015
Goodwill and Intangible Assets Disclosure [Abstract]
Intangible Asset, Net	Intangible Asset, Net The 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): June 30, December 31, Purchased technology $ 8,050 $ 8,050 Less: Accumulated amortization (2,620 ) (2,270 ) Intangible asset, net $ 5,430 $ 5,780 Amortization expense of the intangible asset was $0.2 million for both the three months ended June 30, 2015 and 2014 , and $0.4 million for both the six months ended June 30, 2015 and 2014 . The total estimated annual future amortization expense of this intangible asset as of June 30, 2015 , is as follows (in thousands): Fiscal Year 2015 (remaining 6 months) $ 351 2016 701 2017 701 2018 701 2019 701 Thereafter 2,275 Total $ 5,430

Related Party Transactions

Related Party Transactions	6 Months Ended
	Jun. 30, 2015
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, or ADVANCE, dated March 18, 2011 , as our 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 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 $0.3 million and $1.6 million for the three and six months ended June 30, 2015 , respectively, compared to $0.1 million and $1.1 million for the three and six months ended June 30, 2014 , respectively. The accounts receivable balance under this distribution agreement was $1.0 million and $0.2 million as of June 30, 2015 , and December 31, 2014 , respectively.

Commitments and Contingencies

Commitments and Contingencies	6 Months Ended
	Jun. 30, 2015
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 October 2015 , Taipei, Taiwan, under a lease which extends through August 2016 , Seoul, South Korea, under a lease which extends through October 2015 , Reston, Virginia, under a lease which extends through September 2020 , and Dublin, Ireland under a month-to-month lease. 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 and $1.1 million for the three and six months ended June 30, 2015 , respectively, compared to $0.4 million and $0.7 million for the three and six months ended June 30, 2014 , respectively. Future minimum lease payments under the non-cancellable operating leases as of June 30, 2015 , are as follows (in thousands): Year Ending December 31, Amount 2015 (remaining 6 months) $ 1,102 2016 2,219 2017 1,995 2018 1,848 2019 694 Thereafter 228 Total future minimum lease payments $ 8,086 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) June 30, 2015 December 31, Computer equipment 3 $ 382 $ 382 Total capital leased equipment 382 382 Less: Accumulated depreciation and amortization (85 ) (21 ) Capital leased equipment, net $ 297 $ 361 Total amortization of assets acquired under capital leases was $32,000 and $0.1 million for the three and six months ended June 30, 2015 , respectively, which is included in total depreciation and amortization expense. There were no such arrangements during the three and six months ended June 30, 2014 . Future minimum payments required under capital leases as of June 30, 2015 , are as follows (in thousands): Year Ending December 31, Amount 2015 (remaining 6 months) $ 66 2016 132 2017 141 Total future payments $ 339 Less: Amount representing interest $ 16 Present value of future minimum payments 323 Less: Current portion 122 Long term portion $ 201 Purchase Commitments The Company had non-cancellable purchase obligations to contract manufacturers and suppliers of $10.0 million and $4.0 million at June 30, 2015 , and December 31, 2014 , respectively. The $6.0 million increase in contract obligations from December 31, 2014 to June 30, 2015 was mainly due to inventory purchase commitments relating to our launch of the CoolSmooth PRO and in contemplation of future demand and sales levels. Unrecognized Tax Benefits The Company's gross liability for unrecognized tax benefits totaled $29,000 , including estimated interest and penalties, as of June 30, 2015 , and is classified in long-term income taxes payable. 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. The Company records a liability in its 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. The Company is not currently a defendant in any litigation or claims that are expected to have a material impact on the Company's condensed consolidated financial statements. 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 our exposure to these claims, but this insurance is subject to a cap on reimbursement. Future product liability losses are, by their nature, uncertain and are based upon complex judgments and probabilities. The Company accrues for certain probable product liabilities to the extent they can be reasonably estimated. The Company estimates these accruals for probable losses based on various factors, including historical claims and settlement experience. The total value of self-insured product liability claims settled in the three and six months ended June 30, 2015 and 2014 , respectively, are not material. The value of known and reasonably estimable self-insured product liability claims pending was $0.8 million as of June 30, 2015 . Such estimated claims were not material as of December 31, 2014 . 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.

Stock-Based Compensation Expens

Stock-Based Compensation Expense	6 Months Ended
	Jun. 30, 2015
Disclosure of Compensation Related Costs, Share-based Payments [Abstract]
Stock-Based Compensation Expense	Stock-Based Compensation Expense Stock-Based Compensation Activity Activity under the Company’s stock-based compensation plans is set forth below: Options Outstanding Shares Available for Grant Number of Stock Options Outstanding Weighted- Average Exercise Price Balance, December 31, 2014 2,685,209 3,242,421 $ 6.47 Additional shares reserved 1,000,000 — — Options granted (45,622 ) 45,622 34.65 Restricted stock units granted (426,972 ) — — Options exercised — (311,522 ) 5.30 Options canceled 17,599 (17,599 ) 6.52 Restricted stock units canceled 108,727 — — Restricted stock units withheld for tax 174,867 — — Balance, June 30, 2015 3,513,808 2,958,922 $ 7.03 Restricted Stock Activity Activity related to restricted stock units and awards is set forth below: Number of Units and Awards Weighted- Balance, December 31, 2014 1,533,081 $ 10.08 Restricted stock units granted 426,972 31.56 Restricted stock units vested (431,608 ) 9.18 Restricted stock units canceled (108,727 ) 11.70 Balance, June 30, 2015 1,419,718 $ 16.63 During the three and six months ended June 30, 2015 , 101,407 and 431,608 shares vested, respectively, subject to previously granted restricted stock units. A majority of these vested restricted stock units were net share settled. During the three and six months ended June 30, 2015 , the Company withheld 41,832 and 174,867 shares, respectively, 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 and six months ended June 30, 2014 , 109,576 and 429,158 shares vested, respectively, subject to previously granted restricted stock units. A majority of these vested restricted stock units were net share settled. During the three and six months ended June 30, 2014 , the Company withheld 42,018 and 176,854 shares, respectively, 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 was $1.3 million and $5.6 million for the three and six months ended June 30, 2015 , respectively. Total payments for employee's tax obligations to the relevant taxing authority was $0.7 million and $3.2 million for the three and six months ended June 30, 2014 , respectively. 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 categorized as follows (in thousands): Three Months Ended Six Months Ended June 30, June 30, 2015 2014 2015 2014 Revenue $ 68 $ — $ 148 $ — Cost of revenue 149 117 283 210 Research and development 392 263 742 469 Sales and marketing 1,345 998 2,896 1,934 General and administrative 1,129 1,028 3,164 1,898 Total stock-based compensation $ 3,083 $ 2,406 $ 7,233 $ 4,511 As of June 30, 2015 , the total unrecognized compensation costs related to outstanding stock options, awards and employee stock purchases was $20.1 million , which is expected to be recognized using the straight-line attribution method over 1.6 years . Performance-Based Awards 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 $0.5 million and $2.0 million for the three and six months ended June 30, 2015 , respectively, compared to $0.5 million and $1.0 million for the three and six months ended June 30, 2014 , respectively. 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. During 2015, the Company modified its approach for calculating assumptions related to the expected term and volatility as detailed below. The fair value of employee stock options was estimated using the following weighted-average assumptions: Three Months Ended Six Months Ended June 30, June 30, 2015 2014 2015 2014 Expected term (in years) N/A 4.4 4.8 4.4 Expected volatility N/A 43 % 63 % 43 % Risk-free interest rate N/A 1.30 % 1.29 % 1.21 % Expected dividend yield N/A — % — % — % Expected Term . Prior to the Company's initial public offering of its common stock, or IPO, the Company derived the expected term using the “simplified” method (the expected term is determined as the average of the time-to-vesting and the contractual life of the options), as the Company had limited historical information to develop expectations about future exercise patterns and post-vesting employment termination behavior. Subsequent to the 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 . Prior to the IPO, because the Company was a private entity with no historical data regarding the volatility of its common stock, the expected volatility used was based on volatility 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. 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. No stock options were granted in the three months ended June 30, 2015 . During the six months ended June 30, 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 and six months ended June 30, 2014 , the Company granted 180,000 and 250,000 stock options, respectively, to employees with a weighted-average grant date fair value of $6.42 and $6.77 per share, respectively. During the three and six months ended June 30, 2015 , the Company granted 65,215 and 418,972 restricted stock units, respectively, to employees with a weighted-average grant date fair value of $29.42 and $31.56 per share, respectively. During the three and six months ended June 30, 2014 , the Company granted 185,375 and 369,175 restricted stock units, respectively, to employees with a weighted-average grant date fair value of $15.79 and $18.28 per share, respectively. During the six months ended June 30, 2015 , employees purchased 52,965 shares under the Company's employee stock purchase plan, or ESPP, at a weighted average exercise price of $22.02 . As of June 30, 2015 , the unrecognized compensation cost related to the ESPP was $0.3 million , which will be recognized using the straight-line attribution method over 0.4 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 and six months ended June 30, 2015, the Company granted stock-based awards to a non-employee that vest over one year. During the three and six months ended June 30, 2014 , the Company granted stock-based awards to a non-employee which will vest over two years . Stock-based compensation expense related to non-employee grants was $0.1 million and $0.3 million for the three and six months ended June 30, 2015 , respectively, of which $0.1 million relates to an arrangement with a non-employee customer and has been recorded as a reduction of revenue for both the three and six months ended June 30, 2015 , respectively, in the condensed consolidated statements of operations. Stock-based compensation expense for non-employees was $21,000 and $0.1 million for the three and six months ended June 30, 2014 , respectively.

Net Income (Loss) Per Share of

Net Income (Loss) Per Share of Common Stock	6 Months Ended
	Jun. 30, 2015
Earnings Per Share [Abstract]
Net Income (Loss) Per Share of Common Stock	Net Income (Loss) per Share of Common Stock Basic net income (loss) per share of common stock is calculated by dividing the net income (loss) by the weighted-average number of shares of common stock outstanding for the period. Diluted net income (loss) per share of common stock 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 income (loss) per share is as follows: Three Months Ended Six Months Ended June 30, June 30, 2015 2014 2015 2014 Numerator Net income (loss) (in thousands) $ 1,178 $ 2,769 $ (951 ) $ (4,568 ) Denominator Weighted average shares of common stock outstanding used in computing net income (loss) per share, basic 38,649,873 37,440,537 38,517,817 37,328,738 Dilutive effect of incremental shares and share equivalents 2,991,787 3,156,738 — — Weighted average shares of common stock outstanding used in computing net income (loss) per share, diluted 41,641,660 40,597,275 38,517,817 37,328,738 Net income (loss) per share: Net income (loss) per share, basic $ 0.03 $ 0.07 $ (0.02 ) $ (0.12 ) Net income (loss) per share, diluted $ 0.03 $ 0.07 $ (0.02 ) $ (0.12 ) The following outstanding potentially dilutive securities were excluded from the computation of diluted net income (loss) per share of common stock for the periods presented, because including them would have been anti-dilutive: Three Months Ended Six Months Ended June 30, June 30, 2015 2014 2015 2014 Options to purchase common stock 45,622 188,297 2,958,922 3,663,603 Restricted stock units 116,035 141,871 1,419,718 1,766,501 Common stock issuable pursuant to the ESPP — — 722 2,633 Total 161,657 330,168 4,379,362 5,432,737

Income Taxes

Income Taxes	6 Months Ended
	Jun. 30, 2015
Income Tax Disclosure [Abstract]
Income Taxes	Income Taxes The Company recorded income tax expense of $43,000 and $71,000 for the three and six months ended June 30, 2015 , respectively, compared to income tax (benefit) expense of $(73,000) and $6,000 for the three and six months ended June 30, 2014 , respectively. The income tax expense for the three and six months ended June 30, 2015 and 2014 , reflects the mixture and distribution of pre-tax income in the Company's operating jurisdictions. The Company continues to maintain a valuation allowance for its U.S. federal and state deferred tax assets. At June 30, 2015 , the Company had $1.5 million of unrecognized tax benefits, of which $28,000 , if recognized, would affect the effective tax rate due to the valuation allowance that currently offsets deferred tax assets. 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. 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 June 30, 2015 , 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	6 Months Ended
	Jun. 30, 2015
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 Six Months Ended June 30, June 30, 2015 2014 2015 2014 North America $ 51,436 $ 37,077 $ 86,665 $ 59,864 International 12,995 9,984 29,324 18,172 Total $ 64,431 $ 47,061 $ 115,989 $ 78,036 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 $46.4 million and $79.5 million for the three and six months ended June 30, 2015 , respectively, compared to $34.9 million and $55.8 million for the three and six months ended June 30, 2014 , respectively. The following table sets forth revenue by product expressed as dollar amounts (in thousands): Three Months Ended Six Months Ended June 30, June 30, 2015 2014 2015 2014 System revenue $ 32,047 $ 25,383 $ 58,203 $ 39,844 Consumable revenue 32,384 21,678 57,786 38,192 Total $ 64,431 $ 47,061 $ 115,989 $ 78,036 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)	6 Months Ended
	Jun. 30, 2015
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, 2014 , 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 June 30, 2015 , results of operations for the three and six months ended June 30, 2015 and 2014 , comprehensive income (loss) for the three and six months ended June 30, 2015 and 2014 , and cash flows for the six months ended June 30, 2015 and 2014 . The interim results for the three and six months ended June 30, 2015 , are not necessarily indicative of the results that may be expected for the year ending December 31, 2015 , or for any other future annual or interim period. Certain amounts in the prior year's condensed consolidated balance sheet have been reclassified to conform to the current period's presentation. These reclassifications had no impact on previously reported condensed consolidated statements of cash flows or statements of operations. 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, 2014 . Out of period adjustment During the three months ended June 30, 2015 , the Company recorded and corrected an adjustment related to inventory that served to increase cost of revenue by $0.2 million . The adjustment to cost of revenue and inventory resulted from the reserve and write-off of certain inventory held by vendors starting in the fiscal year ended December 31, 2011 through the first quarter of 2015. Of the total amount of this adjustment to cost of revenue, $0.1 million related to the fiscal year ending December 31, 2012 , $23,000 related to the fiscal year ended December 31, 2013 and $42,000 related to the fiscal year ended December 31, 2014 . The error caused the overstatement of inventory and the understatement of cost of revenue in prior periods. The Company does not believe that such amounts are material to current and previously reported consolidated financial statements.
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 respective local 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 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	Critical Accounting Policies There have been no material changes to the Company’s critical accounting policies during the six months ended June 30, 2015 , as compared to the critical accounting policies described in the Company’s Annual Report on Form 10-K for the year ended December 31, 2014 .
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. 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 will 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 the consolidated financial statements and related disclosures. In August 2014 , the FASB issued Accounting Standards Update No. 2014-15, Disclosure of Uncertainties About an Entity's Ability to Continue as a Going Concern. This standard update provides guidance around management's responsibility to evaluate whether there is substantial doubt about an entity's ability to continue as a going concern and to provide related footnote disclosures. The new guidance is effective for all annual and interim periods ending after December 15, 2016 . The new guidance will not have an impact on the Company's consolidated financial statements. In April 2015 , the FASB issued Accounting Standards Update No. 2015-05 regarding Subtopic 350-40, “Intangibles - Goodwill and Other - Internal-Use Software.” This standard provides guidance to customers about whether a cloud computing arrangement includes a software license. If a cloud computing arrangement includes a software license, the customer should account for the software license element of the arrangement consistent with other software licenses. If a cloud computing arrangement does not include a software license, the customer should account for the arrangement as a service contract. The amendments are effective for annual and interim periods beginning after December 15, 2015 . Early adoption is permitted. The amendments may be applied either prospectively to all arrangements entered into or materially modified after the effective date or retrospectively. The Company is currently evaluating the impact this new guidance will have on the consolidated financial statements and related disclosures. In June 2015 , the FASB issued Accounting Standards Update No. 2015-10, Technical Corrections and Improvements. The standard covers a wide range of Topics in the Codification. The amendments in this standard represent changes to clarify the Codification, correct unintended application of guidance, or make minor improvements to the Codification that are not expected to have a significant effect on current accounting practice or create a significant administrative cost on most entities. The amendments are effective for fiscal years and interim periods within those fiscal years, beginning after December 15, 2015 . The Company does not anticipate that the adoption of this standard will have a material impact on its consolidated financial statements and footnote disclosures. The Company is currently evaluating the impact this new guidance will have on the 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 Company did not hold any Level 3 assets or liabilities at June 30, 2015 . 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.
Inventory	Inventory is stated at the lower of cost (which approximates actual cost on a first-in, first-out basis) or market, computed on a standard cost basis. 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, new production introductions and market conditions.

Fair Value of Financial Instr18

Fair Value of Financial Instruments (Tables)	6 Months Ended
	Jun. 30, 2015
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 June 30, 2015 Level 1 Level 2 Level 3 Fair Value Financial Assets Cash equivalents: Money market funds $ 5,930 $ — $ — $ 5,930 Short-term investments: U.S. Agency securities — 3,251 — 3,251 U.S. Treasury — 501 — 501 Corporate bonds — 6,472 — 6,472 Certificates of deposit 1,180 — — 1,180 Long-term investments: U.S. Agency securities — 600 — 600 Corporate bonds — 1,207 — 1,207 Certificates of deposit 2,556 — — 2,556 Total $ 9,666 $ 12,031 $ — $ 21,697 As of December 31, 2014 Level 1 Level 2 Level 3 Fair Value Financial Assets Cash equivalents: Money market funds $ 6,062 $ — $ — $ 6,062 Short-term investments: U.S. Agency securities — 5,240 — 5,240 U.S. Treasury — 1,004 — 1,004 Corporate bonds — 7,774 — 7,774 Commercial paper — 1,349 — 1,349 Certificates of deposit 919 — — 919 Long-term investments: U.S. Agency securities — 999 — 999 U.S. Treasury — 500 — 500 Corporate bonds — 750 — 750 Certificates of deposit 2,556 — — 2,556 Total $ 9,537 $ 17,616 $ — $ 27,153

Balance Sheet Components (Table

Balance Sheet Components (Tables)	6 Months Ended
	Jun. 30, 2015
Organization, Consolidation and Presentation of Financial Statements [Abstract]
Schedule of Investments	The Company's short-term and long-term investments as of June 30, 2015 , are as follows (in thousands): Short-term Amortized Cost Gross Unrealized Gains Gross Unrealized Losses Fair Value U.S. Agency securities $ 3,251 $ — $ — $ 3,251 U.S. Treasury 500 1 — 501 Corporate bonds 6,474 1 (3 ) 6,472 Certificates of deposit 1,180 — — 1,180 Total $ 11,405 $ 2 $ (3 ) $ 11,404 Long-term Amortized Cost Gross Unrealized Gains Gross Unrealized Losses Fair Value U.S. Agency securities $ 600 $ — $ — $ 600 Corporate bonds 1,208 — (1 ) 1,207 Certificates of deposit 2,556 — — 2,556 Total $ 4,364 $ — $ (1 ) $ 4,363 The Company's short-term and long-term investments as of December 31, 2014 , are as follows (in thousands): Short-term Amortized Cost Gross Unrealized Gains Gross Unrealized Losses Fair Value U.S. Agency securities $ 5,240 $ 1 $ (1 ) $ 5,240 U.S. Treasury 1,003 1 — 1,004 Corporate bonds 7,778 2 (6 ) 7,774 Commercial paper 1,349 — — 1,349 Certificates of deposit 919 — — 919 Total $ 16,289 $ 4 $ (7 ) $ 16,286 Long-term Amortized Cost Gross Unrealized Gains Gross Unrealized Losses Fair Value U.S. Agency securities $ 1,000 $ — $ (1 ) $ 999 U.S. Treasury 500 — — 500 Corporate bonds 752 — (2 ) 750 Certificates of deposit 2,556 — — 2,556 Total $ 4,808 $ — $ (3 ) $ 4,805
Schedule of Contractual Maturities of Investments	The contractual maturities of the Company's short-term and long-term investments as of June 30, 2015 , are as follows (in thousands): June 30, 2015 Amortized Cost Fair Value Due in one year or less $ 11,405 $ 11,404 Due in one year to five years 4,364 4,363 $ 15,769 $ 15,767
Schedule of Inventory	The components of inventory consist of the following (in thousands): June 30, December 31, Raw materials $ 8,987 $ 7,692 Finished goods 9,385 7,844 Total inventory $ 18,372 $ 15,536
Schedule of Property and Equipment, Net	Property and equipment, net comprised the following (in thousands): June 30, December 31, Lab equipment, tooling and molds $ 2,959 $ 2,766 Computer software 2,081 1,337 Computer equipment 1,308 984 Leasehold improvements 1,525 1,452 Furniture and fixtures 681 494 Vehicles 35 35 Total property and equipment 8,589 7,068 Less: Accumulated depreciation and amortization (4,788 ) (4,111 ) Construction in progress 385 767 Property and equipment, net $ 4,186 $ 3,724
Schedule of Accrued Liabilities	The following table shows the components of accrued liabilities (in thousands): June 30, December 31, Accrued payroll and employee related expenses $ 10,150 $ 8,386 Accrued marketing expenses 4,438 2,959 Accrued royalty 4,581 3,612 Sales and other taxes payable 2,222 2,123 Advance payments from customers 1,295 1,908 Accrued warranty 339 569 Accrued legal expenses 2,556 592 Other accrued liabilities 1,400 1,301 Total accrued liabilities $ 26,981 $ 21,450
Schedule of Product Warranty Accrual	The product warranty accrual was as follows (in thousands): Three Months Ended Six Months Ended June 30, June 30, 2015 2014 2015 2014 Balance at the beginning of the period $ 440 $ 660 $ 569 $ 676 Change in accruals for warranties issued (134 ) 159 (163 ) 198 Settlements of warranty claims 33 (78 ) (67 ) (133 ) Balance at the end of the period $ 339 $ 741 $ 339 $ 741

Intangible Asset, Net (Tables)

Intangible Asset, Net (Tables)	6 Months Ended
	Jun. 30, 2015
Goodwill and Intangible Assets Disclosure [Abstract]
Schedule of Intangible Assets, Net	Intangible asset, net comprised the following (in thousands): June 30, December 31, Purchased technology $ 8,050 $ 8,050 Less: Accumulated amortization (2,620 ) (2,270 ) Intangible asset, net $ 5,430 $ 5,780
Schedule of Total Estimated Annual Future Amortization Expense	The total estimated annual future amortization expense of this intangible asset as of June 30, 2015 , is as follows (in thousands): Fiscal Year 2015 (remaining 6 months) $ 351 2016 701 2017 701 2018 701 2019 701 Thereafter 2,275 Total $ 5,430

Commitments and Contingencies (

Commitments and Contingencies (Tables)	6 Months Ended
	Jun. 30, 2015
Commitments and Contingencies Disclosure [Abstract]
Schedule of Future Minimum Rental Payments for Operating Leases	Future minimum lease payments under the non-cancellable operating leases as of June 30, 2015 , are as follows (in thousands): Year Ending December 31, Amount 2015 (remaining 6 months) $ 1,102 2016 2,219 2017 1,995 2018 1,848 2019 694 Thereafter 228 Total future minimum lease payments $ 8,086
Schedule of Capital Leased Assets	Property and equipment includes amounts under leases that have been capitalized as follows (dollars in thousands): Useful life (Years) June 30, 2015 December 31, Computer equipment 3 $ 382 $ 382 Total capital leased equipment 382 382 Less: Accumulated depreciation and amortization (85 ) (21 ) Capital leased equipment, net $ 297 $ 361
Schedule of Future Minimum Payments Required Under Capital Leases	Future minimum payments required under capital leases as of June 30, 2015 , are as follows (in thousands): Year Ending December 31, Amount 2015 (remaining 6 months) $ 66 2016 132 2017 141 Total future payments $ 339 Less: Amount representing interest $ 16 Present value of future minimum payments 323 Less: Current portion 122 Long term portion $ 201

Stock-Based Compensation Expe22

Stock-Based Compensation Expense (Tables)	6 Months Ended
	Jun. 30, 2015
Disclosure of Compensation Related Costs, Share-based Payments [Abstract]
Stock Options Activity	Activity under the Company’s stock-based compensation plans is set forth below: Options Outstanding Shares Available for Grant Number of Stock Options Outstanding Weighted- Average Exercise Price Balance, December 31, 2014 2,685,209 3,242,421 $ 6.47 Additional shares reserved 1,000,000 — — Options granted (45,622 ) 45,622 34.65 Restricted stock units granted (426,972 ) — — Options exercised — (311,522 ) 5.30 Options canceled 17,599 (17,599 ) 6.52 Restricted stock units canceled 108,727 — — Restricted stock units withheld for tax 174,867 — — Balance, June 30, 2015 3,513,808 2,958,922 $ 7.03
Restricted Stock Activity	Activity related to restricted stock units and awards is set forth below: Number of Units and Awards Weighted- Balance, December 31, 2014 1,533,081 $ 10.08 Restricted stock units granted 426,972 31.56 Restricted stock units vested (431,608 ) 9.18 Restricted stock units canceled (108,727 ) 11.70 Balance, June 30, 2015 1,419,718 $ 16.63
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 categorized as follows (in thousands): Three Months Ended Six Months Ended June 30, June 30, 2015 2014 2015 2014 Revenue $ 68 $ — $ 148 $ — Cost of revenue 149 117 283 210 Research and development 392 263 742 469 Sales and marketing 1,345 998 2,896 1,934 General and administrative 1,129 1,028 3,164 1,898 Total stock-based compensation $ 3,083 $ 2,406 $ 7,233 $ 4,511
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 Six Months Ended June 30, June 30, 2015 2014 2015 2014 Expected term (in years) N/A 4.4 4.8 4.4 Expected volatility N/A 43 % 63 % 43 % Risk-free interest rate N/A 1.30 % 1.29 % 1.21 % Expected dividend yield N/A — % — % — %

Net Income (Loss) Per Share o23

Net Income (Loss) Per Share of Common Stock (Tables)	6 Months Ended
	Jun. 30, 2015
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 income (loss) per share is as follows: Three Months Ended Six Months Ended June 30, June 30, 2015 2014 2015 2014 Numerator Net income (loss) (in thousands) $ 1,178 $ 2,769 $ (951 ) $ (4,568 ) Denominator Weighted average shares of common stock outstanding used in computing net income (loss) per share, basic 38,649,873 37,440,537 38,517,817 37,328,738 Dilutive effect of incremental shares and share equivalents 2,991,787 3,156,738 — — Weighted average shares of common stock outstanding used in computing net income (loss) per share, diluted 41,641,660 40,597,275 38,517,817 37,328,738 Net income (loss) per share: Net income (loss) per share, basic $ 0.03 $ 0.07 $ (0.02 ) $ (0.12 ) Net income (loss) per share, diluted $ 0.03 $ 0.07 $ (0.02 ) $ (0.12 )
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 income (loss) per share of common stock for the periods presented, because including them would have been anti-dilutive: Three Months Ended Six Months Ended June 30, June 30, 2015 2014 2015 2014 Options to purchase common stock 45,622 188,297 2,958,922 3,663,603 Restricted stock units 116,035 141,871 1,419,718 1,766,501 Common stock issuable pursuant to the ESPP — — 722 2,633 Total 161,657 330,168 4,379,362 5,432,737

Segment Information (Tables)

Segment Information (Tables)	6 Months Ended
	Jun. 30, 2015
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 Six Months Ended June 30, June 30, 2015 2014 2015 2014 North America $ 51,436 $ 37,077 $ 86,665 $ 59,864 International 12,995 9,984 29,324 18,172 Total $ 64,431 $ 47,061 $ 115,989 $ 78,036
Revenue By Product	The following table sets forth revenue by product expressed as dollar amounts (in thousands): Three Months Ended Six Months Ended June 30, June 30, 2015 2014 2015 2014 System revenue $ 32,047 $ 25,383 $ 58,203 $ 39,844 Consumable revenue 32,384 21,678 57,786 38,192 Total $ 64,431 $ 47,061 $ 115,989 $ 78,036

Basis of Presentation and Sum25

Basis of Presentation and Summary of Significant Accounting Policies - Out of Period Adjustments (Details) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2015	Jun. 30, 2014	Jun. 30, 2015	Jun. 30, 2014
Error Corrections and Prior Period Adjustments Restatement [Line Items]
Cost of revenue	$ 18,116	$ 13,660	$ 32,494	$ 22,676
Overstatement of Inventory and Understatement of Cost of Revenue [Member] | Restatement Adjustment [Member]
Error Corrections and Prior Period Adjustments Restatement [Line Items]
Cost of revenue	200
Overstatement of Inventory and Understatement of Cost of Revenue [Member] | Restatement Adjustment [Member] | Adjustment Related to Fiscal 2012 [Member]
Error Corrections and Prior Period Adjustments Restatement [Line Items]
Cost of revenue	100
Overstatement of Inventory and Understatement of Cost of Revenue [Member] | Restatement Adjustment [Member] | Adjustment Related to Fiscal 2013 [Member]
Error Corrections and Prior Period Adjustments Restatement [Line Items]
Cost of revenue	23
Overstatement of Inventory and Understatement of Cost of Revenue [Member] | Restatement Adjustment [Member] | Adjustment Related to Fiscal 2014 [Member]
Error Corrections and Prior Period Adjustments Restatement [Line Items]
Cost of revenue	$ 42

Basis of Presentation and Sum26

Basis of Presentation and Summary of Significant Accounting Policies - Concentration of Credit Risk (Details) - Jun. 30, 2015 - Customer Concentration Risk [Member] - customer	Total	Total
Accounts Receivable [Member]
Concentration Risk [Line Items]
Concentration risk, number		1
Concentration risk, percentage		30.00%
Revenue [Member]
Concentration Risk [Line Items]
Concentration risk, number	1	1
Concentration risk, percentage	17.00%	14.00%

Fair Value of Financial Instr27

Fair Value of Financial Instruments (Details) - USD ($)	Jun. 30, 2015	Dec. 31, 2014
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Available-for-sale securities, fair value disclosure	$ 15,767,000
Assets, fair value disclosure	21,697,000	$ 27,153,000
Money market funds [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Cash equivalents, fair value disclosure	5,930,000	6,062,000
Short-term Investments [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Available-for-sale securities, fair value disclosure	11,404,000	16,286,000
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	3,251,000	5,240,000
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	501,000	1,004,000
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	6,472,000	7,774,000
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		1,349,000
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	1,180,000	919,000
Long-term Investments [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Available-for-sale securities, fair value disclosure	4,363,000	4,805,000
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	600,000	999,000
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		500,000
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	1,207,000	750,000
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	2,556,000	2,556,000
Level 1 [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Assets, fair value disclosure	9,666,000	9,537,000
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	5,930,000	6,062,000
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
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	1,180,000	919,000
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] | 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
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	2,556,000	2,556,000
Level 2 [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Assets, fair value disclosure	12,031,000	17,616,000
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	3,251,000	5,240,000
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	501,000	1,004,000
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	6,472,000	7,774,000
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		1,349,000
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	600,000	999,000
Level 2 [Member] | 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		500,000
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	1,207,000	750,000
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
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] | 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
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	Jun. 30, 2015	Dec. 31, 2014
Schedule of Available-for-sale Securities [Line Items]
Amortized Cost	$ 15,769
Fair Value	15,767
Short-term Investments [Member]
Schedule of Available-for-sale Securities [Line Items]
Amortized Cost	11,405	$ 16,289
Gross Unrealized Gains	2	4
Gross Unrealized Losses	(3)	(7)
Fair Value	11,404	16,286
Short-term Investments [Member] | U.S. Agency securities [Member]
Schedule of Available-for-sale Securities [Line Items]
Amortized Cost	3,251	5,240
Gross Unrealized Gains	0	1
Gross Unrealized Losses	0	(1)
Fair Value	3,251	5,240
Short-term Investments [Member] | U.S. Treasury [Member]
Schedule of Available-for-sale Securities [Line Items]
Amortized Cost	500	1,003
Gross Unrealized Gains	1	1
Gross Unrealized Losses	0	0
Fair Value	501	1,004
Short-term Investments [Member] | Corporate bonds [Member]
Schedule of Available-for-sale Securities [Line Items]
Amortized Cost	6,474	7,778
Gross Unrealized Gains	1	2
Gross Unrealized Losses	(3)	(6)
Fair Value	6,472	7,774
Short-term Investments [Member] | Commercial paper [Member]
Schedule of Available-for-sale Securities [Line Items]
Amortized Cost		1,349
Gross Unrealized Gains		0
Gross Unrealized Losses		0
Fair Value		1,349
Short-term Investments [Member] | Certificates of deposit [Member]
Schedule of Available-for-sale Securities [Line Items]
Amortized Cost	1,180	919
Gross Unrealized Gains	0	0
Gross Unrealized Losses	0	0
Fair Value	1,180	919
Long-term Investments [Member]
Schedule of Available-for-sale Securities [Line Items]
Amortized Cost	4,364	4,808
Gross Unrealized Gains	0	0
Gross Unrealized Losses	(1)	(3)
Fair Value	4,363	4,805
Long-term Investments [Member] | U.S. Agency securities [Member]
Schedule of Available-for-sale Securities [Line Items]
Amortized Cost	600	1,000
Gross Unrealized Gains	0	0
Gross Unrealized Losses	0	(1)
Fair Value	600	999
Long-term Investments [Member] | U.S. Treasury [Member]
Schedule of Available-for-sale Securities [Line Items]
Amortized Cost		500
Gross Unrealized Gains		0
Gross Unrealized Losses		0
Fair Value		500
Long-term Investments [Member] | Corporate bonds [Member]
Schedule of Available-for-sale Securities [Line Items]
Amortized Cost	1,208	752
Gross Unrealized Gains	0	0
Gross Unrealized Losses	(1)	(2)
Fair Value	1,207	750
Long-term Investments [Member] | Certificates of deposit [Member]
Schedule of Available-for-sale Securities [Line Items]
Amortized Cost	2,556	2,556
Gross Unrealized Gains	0	0
Gross Unrealized Losses	0	0
Fair Value	$ 2,556	$ 2,556

Balance Sheet Components - In29

Balance Sheet Components - Investments, Contractual Maturities (Details) $ in Thousands	Jun. 30, 2015USD ($)
Organization, Consolidation and Presentation of Financial Statements [Abstract]
Amortized Cost, Due in one year or less	$ 11,405
Amortized Cost, Due in one year to five years	4,364
Amortized Cost	15,769
Fair Value, Due in one year or less	11,404
Fair Value, Due in one year to five years	4,363
Fair Value	$ 15,767

Balance Sheet Components - In30

Balance Sheet Components - Inventory (Details) - USD ($) $ in Thousands	Jun. 30, 2015	Dec. 31, 2014
Inventory, Net [Abstract]
Raw materials	$ 8,987	$ 7,692
Finished goods	9,385	7,844
Total inventory	$ 18,372	$ 15,536

Balance Sheet Components - Prop

Balance Sheet Components - Property and Equipment, Net (Details) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2015	Jun. 30, 2014	Jun. 30, 2015	Jun. 30, 2014	Dec. 31, 2014
Property, Plant and Equipment [Line Items]
Property, plant and equipment, gross	$ 8,589		$ 8,589		$ 7,068
Less: Accumulated depreciation and amortization	(4,788)		(4,788)		(4,111)
Property and equipment, net	4,186		4,186		3,724
Property and equipment acquired under capital leases	382		382		382
Depreciation expense	400	$ 300	700	$ 600
Lab equipment, tooling and molds [Member]
Property, Plant and Equipment [Line Items]
Property, plant and equipment, gross	2,959		2,959		2,766
Computer software [Member]
Property, Plant and Equipment [Line Items]
Property, plant and equipment, gross	2,081		2,081		1,337
Computer equipment [Member]
Property, Plant and Equipment [Line Items]
Property, plant and equipment, gross	1,308		1,308		984
Property and equipment acquired under capital leases	382		382		382
Leasehold improvements [Member]
Property, Plant and Equipment [Line Items]
Property, plant and equipment, gross	1,525		1,525		1,452
Furniture and fixtures [Member]
Property, Plant and Equipment [Line Items]
Property, plant and equipment, gross	681		681		494
Vehicles [Member]
Property, Plant and Equipment [Line Items]
Property, plant and equipment, gross	35		35		35
Construction in Progress [Member]
Property, Plant and Equipment [Line Items]
Property, plant and equipment, gross	$ 385		$ 385		$ 767

Balance Sheet Components - Accr

Balance Sheet Components - Accrued Liabilities (Details) - USD ($) $ in Thousands	Jun. 30, 2015	Dec. 31, 2014
Organization, Consolidation and Presentation of Financial Statements [Abstract]
Accrued payroll and employee related expenses	$ 10,150	$ 8,386
Accrued marketing expenses	4,438	2,959
Accrued royalty	4,581	3,612
Sales and other taxes payable	2,222	2,123
Advance payments from customers	1,295	1,908
Accrued warranty	339	569
Accrued legal expenses	2,556	592
Other accrued liabilities	1,400	1,301
Total accrued liabilities	$ 26,981	$ 21,450

Balance Sheet Components - Prod

Balance Sheet Components - Product Warranty (Details) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2015	Jun. 30, 2014	Jun. 30, 2015	Jun. 30, 2014
Movement in Standard Product Warranty Accrual [Roll Forward]
Balance at the beginning of the period	$ 440	$ 660	$ 569	$ 676
Change in accruals for warranties issued	(134)	159	(163)	198
Settlements of warranty claims	33	(78)	(67)	(133)
Balance at the end of the period	$ 339	$ 741	$ 339	$ 741
Direct Customer [Member] | Control Units [Member]
Product Liability Contingency [Line Items]
Product Warranty Accrual, Term			1 year
Direct Customer [Member] | Applicators [Member]
Product Liability Contingency [Line Items]
Product Warranty Accrual, Term			1 year
International [Member] | Indirect Customer [Member] | Control Units [Member]
Product Liability Contingency [Line Items]
Product Warranty Accrual, Term			3 years
International [Member] | Indirect Customer [Member] | Applicators [Member]
Product Liability Contingency [Line Items]
Product Warranty Accrual, Term			1 year

Intangible Asset, Net (Details)

Intangible Asset, Net (Details) - USD ($) $ in Millions	3 Months Ended		6 Months Ended
	Jun. 30, 2015	Jun. 30, 2014	Jun. 30, 2015	Jun. 30, 2014
Goodwill and Intangible Assets Disclosure [Abstract]
Amortization of intangible assets	$ 0.2	$ 0.2	$ 0.4	$ 0.4

Intangible Asset, Net - Intangi

Intangible Asset, Net - Intangible Asset, Net Components (Details) - USD ($) $ in Thousands	Jun. 30, 2015	Dec. 31, 2014
Goodwill and Intangible Assets Disclosure [Abstract]
Purchased technology	$ 8,050	$ 8,050
Less: Accumulated amortization	(2,620)	(2,270)
Intangible asset, net	$ 5,430	$ 5,780

Intangible Asset, Net - Estimat

Intangible Asset, Net - Estimated Annual Future Amortization Expense (Details) - USD ($) $ in Thousands	Jun. 30, 2015	Dec. 31, 2014
Intangible Asset, Net, Amortization Expense, Fiscal Year Maturity [Abstract]
2015 (remaining 6 months)	$ 351
2,016	701
2,017	701
2,018	701
2,019	701
Thereafter	2,275
Intangible asset, net	$ 5,430	$ 5,780

Related Party Transactions - Br

Related Party Transactions - Brazilian Distribution Agreement (Details) - Distributor [Member] - USD ($) $ in Millions	3 Months Ended		6 Months Ended
	Jun. 30, 2015	Jun. 30, 2014	Jun. 30, 2015	Jun. 30, 2014	Dec. 31, 2014
Related Party Transaction [Line Items]
Payments term, maximum			180 days
Revenue from related parties	$ 0.3	$ 0.1	$ 1.6	$ 1.1
Accounts receivable, related parties	$ 1		$ 1		$ 0.2

Commitments and Contingencies -

Commitments and Contingencies - Operating Lease Obligations (Details) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2015	Jun. 30, 2014	Jun. 30, 2015	Jun. 30, 2014
Commitments and Contingencies Disclosure [Abstract]
Rent expense	$ 600	$ 400	$ 1,100	$ 700
Operating Leases, Future Minimum Payments Due, Fiscal Year Maturity [Abstract]
2015 (remaining 6 months)	1,102		1,102
2,016	2,219		2,219
2,017	1,995		1,995
2,018	1,848		1,848
2,019	694		694
Thereafter	228		228
Total future minimum lease payments	$ 8,086		$ 8,086

Commitments and Contingencies39

Commitments and Contingencies - Capital Lease Obligations (Details) - USD ($)	3 Months Ended		6 Months Ended		12 Months Ended
	Jun. 30, 2015	Jun. 30, 2014	Jun. 30, 2015	Jun. 30, 2014	Dec. 31, 2014
Capital Leased Assets [Line Items]
Capital leased equipment, gross	$ 382,000		$ 382,000		$ 382,000
Less: Accumulated depreciation and amortization	(85,000)		(85,000)		(21,000)
Capital leased equipment, net	297,000		297,000		361,000
Amortization of assets acquired under capital leases	32,000	$ 0	100,000	$ 0
Future minimum payments under capital leases
2015 (remaining 6 months)	66,000		66,000
2,016	132,000		132,000
2,017	141,000		141,000
Total future payments	339,000		339,000
Less: Amount representing interest	16,000		16,000
Present value of future minimum payments	323,000		323,000
Less: Current portion	122,000		122,000		120,000
Long term portion	201,000		$ 201,000		$ 262,000
Computer equipment [Member]
Capital Leased Assets [Line Items]
Useful Life			3 years		3 years
Capital leased equipment, gross	$ 382,000		$ 382,000		$ 382,000

Commitments and Contingencies40

Commitments and Contingencies - Purchase Commitments, Unrecognized Tax Benefits, and Product Liability Contingencies (Details) - USD ($) $ in Thousands	6 Months Ended
	Jun. 30, 2015	Dec. 31, 2014
Commitments and Contingencies Disclosure [Abstract]
Purchase obligation	$ 10,000	$ 4,000
Increase in contract obligations	6,000
Unrecognized tax benefits, including estimated interest and penalties	29
Known and reasonably estimable self-insured product liability claims pending	$ 800

Stock-Based Compensation Expe41

Stock-Based Compensation Expense - Stock Options Plan Activity (Details) - $ / shares	3 Months Ended		6 Months Ended
	Jun. 30, 2015	Jun. 30, 2014	Jun. 30, 2015	Jun. 30, 2014
Shares Available for Grant
Balance at beginning of period (Shares)			2,685,209
Additional shares reserved (Shares)			1,000,000
Options granted (Shares)			(45,622)
Options canceled (Shares)			17,599
Balance at end of period (Shares)	3,513,808		3,513,808
Number of Stock Options Outstanding
Balance at beginning of period (Shares)			3,242,421
Options granted (Shares)			45,622
Options exercised (Shares)			(311,522)
Options canceled (Shares)			(17,599)
Balance at end of period (Shares)	2,958,922		2,958,922
Weighted-Average Exercise Price
Balance at beginning of period (Weighted average exercise price) (In Dollars per Share)			$ 6.47
Options granted (Weighted average exercise price) (In Dollars per Share)			34.65
Options exercised (Weighted average exercise price) (In Dollars per Share)			5.30
Options canceled (Weighted average exercise price) (In Dollars per Share)			6.52
Balance at end of period (Weighted average exercise price) (In Dollars per Share)	$ 7.03		$ 7.03
Restricted Stock Units (RSUs) [Member]
Shares Available for Grant
Restricted stock units granted (Shares)			(426,972)
Restricted stock units canceled (Shares)			108,727
Restricted stock units withheld for tax (Shares)	41,832	42,018	174,867	176,854

Stock-Based Compensation Expe42

Stock-Based Compensation Expense - Restricted Stock Units (Details) - USD ($) $ / shares in Units, $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2015	Jun. 30, 2014	Jun. 30, 2015	Jun. 30, 2014
Weighted- Average Grant Date Fair Value
Payments for employee's tax obligations to relevant taxing authority			$ 5,599	$ 3,247
Restricted Stock Units (RSUs) [Member]
Number of Units and Awards
Balance at beginning of period (Shares)			1,533,081
Restricted stock units granted (Shares)			426,972
Restricted stock units vested (Shares)	(101,407)	(109,576)	(431,608)	(429,158)
Restricted stock units canceled (Shares)			(108,727)
Balance at end of period (Shares)	1,419,718		1,419,718
Weighted- Average Grant Date Fair Value
Balance at beginning of period (Weighted average exercise price) (In Dollars per Share)			$ 10.08
Restricted stock units granted (Weighted average exercise price) (In Dollars per Share)			31.56
Restricted stock units vested (Weighted average exercise price) (In Dollars per Share)			9.18
Restricted stock units canceled (Weighted average exercise price) (In Dollars per Share)			11.70
Balance at end of period (Weighted average exercise price) (In Dollars per Share)	$ 16.63		$ 16.63
Restricted stock units withheld for tax (Shares)	41,832	42,018	174,867	176,854
Payments for employee's tax obligations to relevant taxing authority	$ 1,300	$ 700	$ 5,600	$ 3,200

Stock-Based Compensation Expe43

Stock-Based Compensation Expense - Allocation of Stock Based Compensation Expense (Details) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2015	Jun. 30, 2014	Jun. 30, 2015	Jun. 30, 2014
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Stock-based compensation expense	$ 3,083	$ 2,406	$ 7,233	$ 4,511
Revenue [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Stock-based compensation expense	68	0	148	0
Cost of Revenue [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Stock-based compensation expense	149	117	283	210
Research and Development [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Stock-based compensation expense	392	263	742	469
Sales and Marketing [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Stock-based compensation expense	1,345	998	2,896	1,934
General and Administrative [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Stock-based compensation expense	1,129	1,028	3,164	1,898
Stock Compensation Plan [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Unrecognized compensation cost	20,100		$ 20,100
Unrecognized compensation cost, recognition period (in years)			1 year 7 months 6 days
Performance Based Stock Options and Restricted Stock Units [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Stock-based compensation expense	$ 500	$ 500	$ 2,000	$ 1,000

Stock-Based Compensation Expe44

Stock-Based Compensation Expense - Assumptions (Details) - Stock Options [Member]	3 Months Ended	6 Months Ended
	Jun. 30, 2014	Jun. 30, 2015	Jun. 30, 2014
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Expected term	4 years 4 months 24 days	4 years 9 months 18 days	4 years 4 months 24 days
Expected volatility	43.00%	63.00%	43.00%
Risk-free interest rate	1.30%	1.29%	1.21%
Expected dividend yield	0.00%	0.00%	0.00%

Stock-Based Compensation Expe45

Stock-Based Compensation Expense - Employee Stock-Based Compensation (Details) - USD ($) $ / shares in Units, $ in Millions	3 Months Ended		6 Months Ended
	Jun. 30, 2015	Jun. 30, 2014	Jun. 30, 2015	Jun. 30, 2014
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Options granted (Shares)			45,622
Stock Compensation Plan [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Options granted (Shares)	0	180,000	45,622	250,000
Weighted average grant date fair value, Options (In Dollars per Share)		$ 6.42	$ 18.19	$ 6.77
Unrecognized compensation cost, recognition period (in years)			1 year 7 months 6 days
Employee Restricted Stock Units (RSUs) [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Restricted stock units granted (Shares)	65,215	185,375	418,972	369,175
Weighted average grant date fair value (In Dollars per Share)	$ 29.42	$ 15.79	$ 31.56	$ 18.28
ESPP [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Shares purchased under employee stock purchase plan			52,965
Weighted average exercise price of shares purchased under employee stock purchase plan (in Dollars per Share)	$ 22.02		$ 22.02
Unrecognized compensation cost	$ 0.3		$ 0.3
Unrecognized compensation cost, recognition period (in years)			5 months

Stock-Based Compensation Expe46

Stock-Based Compensation Expense - Non-Employee Stock-Based Compensation (Details) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2015	Jun. 30, 2014	Jun. 30, 2015	Jun. 30, 2014
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Vesting period for non-employee stock-based awards	1 year	2 years	1 year	2 years
Stock-based compensation expense related to non-employee grants	$ 100	$ 21	$ 300	$ 100
Stock-based compensation expense	3,083	2,406	7,233	4,511
Revenue [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Stock-based compensation expense	$ 68	$ 0	$ 148	$ 0

Net Income (Loss) Per Share o47

Net Income (Loss) Per Share of Common Stock (Details) - USD ($) $ / shares in Units, $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2015	Jun. 30, 2014	Jun. 30, 2015	Jun. 30, 2014
Numerator
Net income (loss)	$ 1,178	$ 2,769	$ (951)	$ (4,568)
Denominator
Weighted average shares of common stock outstanding used in computing net income (loss) per share, basic	38,649,873	37,440,537	38,517,817	37,328,738
Dilutive effect of incremental shares and share equivalents	2,991,787	3,156,738	0	0
Weighted average shares of common stock outstanding used in computing net income (loss) per share, diluted	41,641,660	40,597,275	38,517,817	37,328,738
Net income (loss) per share:
Net income (loss) per share, basic (dollars per share)	$ 0.03	$ 0.07	$ (0.02)	$ (0.12)
Net income (loss) per share, diluted (dollars per share)	$ 0.03	$ 0.07	$ (0.02)	$ (0.12)

Net Income (Loss) Per Share o48

Net Income (Loss) Per Share of Common Stock - Outstanding Shares of Potentially Dilutive Securities (Details) - shares	3 Months Ended		6 Months Ended
	Jun. 30, 2015	Jun. 30, 2014	Jun. 30, 2015	Jun. 30, 2014
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items]
Antidilutive securities excluded from computation of earnings per share, amount (in shares)	161,657	330,168	4,379,362	5,432,737
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)	45,622	188,297	2,958,922	3,663,603
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)	116,035	141,871	1,419,718	1,766,501
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	0	722	2,633

Income Taxes (Details)

Income Taxes (Details) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2015	Jun. 30, 2014	Jun. 30, 2015	Jun. 30, 2014
Income Tax Disclosure [Abstract]
Income tax (benefit) expense	$ 43	$ (73)	$ 71	$ 6
Unrecognized tax benefits	1,500		1,500
Unrecognized tax benefits that would impact effective tax rate	$ 28		$ 28

Segment Information (Details)

Segment Information (Details) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2015USD ($)	Jun. 30, 2014USD ($)	Jun. 30, 2015USD ($)segmentmanagerbusiness_activity	Jun. 30, 2014USD ($)
Segment Reporting Information [Line Items]
Number of business activities | business_activity			1
Number of segment managers held accountable for operations | manager			0
Number of reportable segments | segment			1
Revenue, net	$ 64,431	$ 47,061	$ 115,989	$ 78,036
Systems Revenue [Member]
Segment Reporting Information [Line Items]
Revenue, net	32,047	25,383	58,203	39,844
Consumable Revenue [Member]
Segment Reporting Information [Line Items]
Revenue, net	32,384	21,678	57,786	38,192
Reportable Geographical Components [Member] | North America [Member]
Segment Reporting Information [Line Items]
Revenue, net	51,436	37,077	86,665	59,864
Reportable Geographical Components [Member] | United States [Member]
Segment Reporting Information [Line Items]
Revenue, net	46,400	34,900	79,500	55,800
Reportable Geographical Components [Member] | International [Member]
Segment Reporting Information [Line Items]
Revenue, net	$ 12,995	$ 9,984	$ 29,324	$ 18,172