ZELTIQ Aesthetics (ZLTQ) 10-Q 9 Aug 16 2016 Q2 Quarterly report Financial data

Document and Entity Information

Document and Entity Information - shares	6 Months Ended
	Jun. 30, 2016	Aug. 04, 2016
Document and Entity Information [Abstract]
Document Type	10-Q
Amendment Flag	false
Document Period End Date	Jun. 30, 2016
Document Fiscal Year Focus	2,016
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	Large Accelerated Filer
Entity Common Stock, Shares Outstanding (shares)		39,627,007

Condensed Consolidated Balance

Condensed Consolidated Balance Sheets (Unaudited) - USD ($) $ in Thousands	Jun. 30, 2016	Dec. 31, 2015
CURRENT ASSETS:
Cash and cash equivalents	$ 46,930	$ 35,710
Short-term investments	4,497	12,867
Accounts receivable, net	43,086	33,359
Inventory	28,103	28,095
Prepaid expenses and other current assets	11,135	11,771
Total current assets	133,751	121,802
Long-term investments	508	3,490
Restricted cash	844	452
Property and equipment, net	7,730	6,969
Intangible asset, net	4,767	5,092
Long-term deferred tax assets	38,636	40,475
Other assets	383	547
Total assets	186,619	178,827
CURRENT LIABILITIES:
Accounts payable	13,780	10,903
Accrued and other current liabilities	37,629	34,691
Deferred revenue	20,013	7,682
Current portion of capital lease obligations	127	124
Total current liabilities	71,549	53,400
Long-term deferred revenue	168	226
Long-term capital lease obligations, less current portion	74	138
Other non-current liabilities	858	761
Total liabilities	72,649	54,525
Commitments and contingencies (Note 6)
STOCKHOLDERS’ EQUITY:
Preferred stock, $0.01 par value: 50,000,000 shares authorized and no shares issued and outstanding at June 30, 2016 and December 31, 2015	0	0
Common stock, $0.001 par value: 500,000,000 shares authorized at June 30, 2016, and December 31, 2015; 39,578,675 and 39,217,630 shares issued and outstanding at June 30, 2016 and December 31, 2015, respectively	43	43
Additional paid-in capital	222,368	215,621
Accumulated other comprehensive loss	(3,943)	(1,636)
Accumulated deficit	(104,498)	(89,726)
Total stockholders’ equity	113,970	124,302
Total liabilities and stockholders’ equity	$ 186,619	$ 178,827

Condensed Consolidated Balance3

Condensed Consolidated Balance Sheets (Unaudited) (Parenthetical) - $ / shares	Jun. 30, 2016	Dec. 31, 2015
Statement of Financial Position [Abstract]
Preferred stock, par value (usd per share)	$ 0.01	$ 0.01
Preferred stock, shares authorized (shares)	50,000,000	50,000,000
Preferred stock, shares issued (shares)	0	0
Preferred stock, shares outstanding (shares)	0	0
Common stock, par value (usd per share)	$ 0.001	$ 0.001
Common stock, shares authorized (shares)	500,000,000	500,000,000
Common stock, shares issued (shares)	39,578,675	39,217,630
Common stock, shares outstanding (shares)	39,578,675	39,217,630

Condensed Consolidated Statemen

Condensed Consolidated Statements of Operations (Unaudited) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2016	Jun. 30, 2015	Jun. 30, 2016	Jun. 30, 2015
Income Statement [Abstract]
Revenue	$ 89,465	$ 64,431	$ 153,934	$ 115,989
Cost of revenue	27,521	18,116	45,750	32,494
Gross profit	61,944	46,315	108,184	83,495
Operating expenses:
Research and development	6,403	5,809	12,606	11,889
Sales and marketing	50,293	32,199	90,948	56,605
General and administrative	8,774	6,654	19,320	15,042
Total operating expenses	65,470	44,662	122,874	83,536
Income (loss) from operations	(3,526)	1,653	(14,690)	(41)
Interest income (expense), net	(20)	13	(56)	26
Other income (expense), net	1,409	(445)	2,055	(865)
Income (loss) before income taxes	(2,137)	1,221	(12,691)	(880)
Provision for income taxes	2,765	43	2,081	71
Net income (loss)	$ (4,902)	$ 1,178	$ (14,772)	$ (951)
Basic net income (loss) per share:
Net income (loss) per share, basic (usd per share)	$ (0.12)	$ 0.03	$ (0.38)	$ (0.02)
Weighted average shares of common stock outstanding used in computing net income (loss) per share, basic (shares)	39,493,665	38,649,873	39,391,259	38,517,817
Diluted net income (loss) per share:
Net income (loss) per share, diluted (usd per share)	$ (0.12)	$ 0.03	$ (0.38)	$ (0.02)
Weighted average shares of common stock outstanding used in computing net income (loss) per share, diluted (shares)	39,493,665	41,641,660	39,391,259	38,517,817

Condensed Consolidated Stateme5

Condensed Consolidated Statements of Comprehensive Income (Loss) (Unaudited) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2016	Jun. 30, 2015	Jun. 30, 2016	Jun. 30, 2015
Statement of Comprehensive Income [Abstract]
Net income (loss)	$ (4,902)	$ 1,178	$ (14,772)	$ (951)
Other comprehensive income (loss), net of tax:
Foreign currency translation adjustments	(1,964)	798	(2,329)	210
Changes in unrealized gains (losses) on available-for-sale securities	0	0	22	5
Other comprehensive income (loss), net of tax	(1,964)	798	(2,307)	215
Comprehensive income (loss)	$ (6,866)	$ 1,976	$ (17,079)	$ (736)

Condensed Consolidated Stateme6

Condensed Consolidated Statements of Cash Flows (Unaudited) - USD ($) $ in Thousands	6 Months Ended
	Jun. 30, 2016	Jun. 30, 2015
CASH FLOWS FROM OPERATING ACTIVITIES:
Net loss	$ (14,772)	$ (951)
Adjustments to reconcile net loss to net cash provided by operating activities:
Depreciation and amortization	1,522	1,062
Stock-based compensation	8,822	7,233
Deferred income taxes	1,839	0
Amortization of investment premium, net	33	44
Provision for doubtful accounts receivable	231	158
Provision for excess and obsolete inventory	153	253
Loss on disposal and write-off of property and equipment	22	0
Gain on foreign currency exchange rates	(1,501)	0
Changes in operating assets and liabilities:
Accounts receivable	(10,098)	(9,414)
Inventory	(521)	(2,994)
Prepaid expenses and other assets	702	707
Deferred revenue, net of deferred costs	12,336	2,645
Accounts payable, accrued and other liabilities	6,895	8,487
Net cash provided by operating activities	5,663	7,230
CASH FLOWS FROM INVESTING ACTIVITIES:
Purchase of investments	(741)	(6,024)
Proceeds from sale of investments	8,683	0
Proceeds from maturity of investments	3,398	11,310
Purchase of property and equipment	(2,733)	(1,188)
Change in restricted cash	(421)	1
Net cash provided by investing activities	8,186	4,099
CASH FLOWS FROM FINANCING ACTIVITIES:
Principal payments on capital leases	(62)	(59)
Proceeds from issuance of common stock upon exercise of stock options and from employee stock purchase program	1,801	2,816
Tax payments related to shares withheld for vested restricted stock units	(3,871)	(5,599)
Tax effect of employee stock plans	0	17
Net cash used in financing activities	(2,132)	(2,825)
Effect of exchange rate changes on cash and cash equivalents	(497)	153
NET INCREASE IN CASH AND CASH EQUIVALENTS	11,220	8,657
CASH AND CASH EQUIVALENTS—Beginning of period	35,710	28,649
CASH AND CASH EQUIVALENTS—End of period	$ 46,930	$ 37,306

Basis of Presentation and Summa

Basis of Presentation and Summary of Significant Accounting Policies	6 Months Ended
	Jun. 30, 2016
Organization, Consolidation and Presentation of Financial Statements [Abstract]
Basis of Presentation and Summary of Significant Accounting Policies	Basis of Presentation and Summary of Significant Accounting Policies Basis of Presentation The accompanying interim condensed consolidated financial statements of ZELTIQ Aesthetics, Inc. (the "Company") are unaudited. These interim condensed consolidated financial statements have been prepared in accordance with generally accepted accounting principles in the United States of America, or GAAP, and the applicable rules and regulations of the Securities and Exchange Commission, or SEC, for interim financial information. Accordingly, they do not include all of the information and footnotes required by GAAP for complete financial statements. The December 31, 2015 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, 2016 , results of operations for the three and six months ended June 30, 2016 and 2015 , comprehensive income (loss) for the three and six months ended June 30, 2016 and 2015 , and cash flows for the six months ended June 30, 2016 and 2015 . The interim results for the three and six months ended June 30, 2016 , are not necessarily indicative of the results that may be expected for the year ending December 31, 2016 , or for any other future annual or interim period. The information included in this Quarterly Report on Form 10-Q should be read in conjunction with “Management’s Discussion and Analysis of Financial Condition and Results of Operations," “Quantitative and Qualitative Disclosures About Market Risk” and the Consolidated Financial Statements and notes thereto included in Items 7, 7A and 8, respectively, in the Company's Annual Report on Form 10-K for the year ended December 31, 2015 . Out of period adjustments During the three months ended June 30, 2016 , the Company recorded certain out-of-period correcting adjustments totaling $0.4 million to increase cost of revenue by $0.2 million , with a corresponding decrease to inventory, and to increase other operating expenses by $0.2 million , with a corresponding increase to other accruals, relating to prior periods. The Company does not believe that such amounts are material to any prior period consolidated financial statements, and the impact of correcting these errors in the six months ended June 30, 2016 is not material to the current consolidated financial statements or expected to be material to the financial statements for the year ending December 31, 2016 . During the three months ended March 31, 2016 , the Company recorded certain out-of-period correcting adjustments totaling $0.2 million to increase cost of revenue by $0.4 million , with a corresponding increase to warranty accrual, and to reduce other operating expenses by $0.2 million , with a corresponding decrease to other accruals, relating to prior periods. The Company does not believe that such amounts are material to any prior period consolidated financial statements, and the impact of correcting these errors in the three months ended March 31, 2016 is not material to the current consolidated financial statements or expected to be material to the financial statements for the year ending December 31, 2016 . During the three months ended June 30, 2015 , the Company recorded an out-of-period adjustment of $0.2 million to increase cost of revenue to write-off of certain inventory held by vendors. Of this adjustment, $0.1 million , $23,000 and $42,000 related to the fiscal years ended December 31, 2013 , 2014 and 2015 , respectively. The Company does not believe that such amounts are material to any prior period consolidated financial statements, and the impact of correcting these errors in the six months ended June 30, 2015 is not material to the current 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 income (expense), net. Use of Estimates The preparation of financial statements in conformity with GAAP requires management to make certain estimates and assumptions that affect the reported amounts of assets and liabilities and disclosure of contingent assets and liabilities at the date of the financial statements and the reported amounts of revenue and expenses during the reported periods. The primary estimates underlying the Company's financial statements include the value of revenue elements, product warranty, inventory valuation, allowance for doubtful accounts receivable, assumptions regarding variables used in calculating the fair value of the Company's equity awards, fair value of investments, useful lives of intangibles, income taxes and contingent liabilities. Actual results could differ from those estimates. Concentration of Credit Risk As of June 30, 2016 , no individual customer accounted for more than 10% of accounts receivable. As of December 31, 2015 , one individual customer, which is a large aesthetic chain, accounted for 10% of accounts receivable. During the three months ended June 30, 2016 , one individual customer accounted for 12% of total revenue. During the six months ended June 30, 2016 , no customer accounted for more than 10% of total revenue. During the three and six months ended June 30, 2015 , one individual customer accounted for 17% and 14% of total revenue, respectively. Critical Accounting Policies There have been no changes to the Company’s critical accounting policies during the six months ended June 30, 2016 , as compared to the critical accounting policies described in the Company’s Annual Report on Form 10-K for the year ended December 31, 2015 . Recent Accounting Pronouncements On May 28, 2014 , the Financial Accounting Standards Board, or FASB, issued Accounting Standards Update No. 2014-09, Revenue from Contracts with Customers: Topic 606 and issued subsequent amendments to the initial guidance in August 2015, March 2016, April 2016 and May 2016 within ASU 2015-14, ASU 2016-08, ASU 2016-10 and ASU 2016-12, respectively (ASU 2014-09, ASU 2015-14, ASU 2016-08, ASU 2016-10 and ASU 2016-12 collectively, Topic 606). Topic 606 supersedes nearly all existing revenue recognition guidance under GAAP. The objective of this update is to provide a single, comprehensive revenue recognition model for all contracts with customers to improve comparability within industries, across industries, and across capital markets. This standard update contains principles that the Company will apply to determine the measurement of revenue and timing of when it is recognized. This guidance allows for two methods of adoption: (a) full retrospective adoption, meaning the guidance is applied to all periods presented, or (b) modified retrospective adoption, meaning the cumulative effect of applying this guidance is recognized as an adjustment to the fiscal 2018 opening accumulated deficit balance. The Company expects to adopt this guidance effective January 1, 2018 , and is currently evaluating the two adoption methods as well as the impact this new guidance will have on its consolidated financial statements and related disclosures. In July 2015 , the FASB issued Accounting Standards Update No. 2015-11 to amend ASC Topic 330, Inventory ("ASC 330") to simplify the measurement of inventory. The amendments require that an entity measure inventory at the lower of cost and net realizable value instead of the lower of cost and market. This guidance is effective for public companies for years, and interim periods within those years, beginning on or after December 15, 2016, with earlier application permitted as of the beginning of an interim or annual reporting period. This guidance will be effective for the Company beginning in its first quarter of fiscal 2017. The Company is currently evaluating the impact this new guidance will have on its consolidated financial statements and related disclosures. In February 2016, the FASB issued Accounting Standards Update No. 2016-02, Leases. This ASU requires lease assets and lease liabilities arising from leases, including operating leases, to be recognized on the balance sheet. ASU 2016-02 will become effective for the Company on January 1, 2019, and requires adoption using a modified retrospective approach. The Company is currently evaluating the impact of this guidance on its consolidated financial statements and related disclosures. In March 30, 2016, the FASB issued Accounting Standards Update No. 2016-09, Improvements to Employee Share-Based Payment Accounting. This ASU will change how companies account for certain aspects of share-based payments to employees. This guidance will require all income tax effects of awards to be recognized in the income statement when the awards vest or are settled. It also will allow an employer to repurchase more of an employee's shares than it can today for tax withholding purposes without triggering liability accounting and to make a policy election to account for forfeitures as they occur. The guidance is effective for public business entities for fiscal years beginning after December 2016, and interim periods within those years, with earlier application permitted in any annual or interim period for which financial statements haven't been issued or made available for issuance, but all of the guidance must be adopted in the same period. The Company is currently evaluating the impact this new guidance will have on its consolidated financial statements and related disclosures. In May 2016, the FASB issued ASU No. 2016-11, “Revenue Recognition (Topic 605) and Derivatives and Hedging (Topic 815): Rescission of SEC Guidance Because of Accounting Standards Updates 2014-09 and 2014-16 pursuant to Staff announcements at the March 3, 2016 EITF Meeting” (“ASU 2016-11”). The purpose of ASU 2016-11 is to rescind from the FASB Accounting Standards Codification certain SEC paragraphs as a result of two SEC Staff Announcements at the March 3, 2016 meeting. For public entities, the amendments in ASU 2016-11 related to Topic 605 are effective for interim and annual reporting periods beginning after December 15, 2017 and amendments related to Topic 815 are effective for interim and annual reporting periods beginning after December 15, 2015. The Company is currently assessing the impact of ASU 2016-11 on its condensed consolidated financial statements. In June 2016, the FASB issued ASU 2016-13, "Financial Instruments – Credit Losses." This ASU changes the accounting for recognizing impairments of financial assets. Under the new guidance, credit losses for certain types of financial instruments will be estimated based on expected losses. The new guidance also modifies the impairment models for available-for-sale debt securities and for purchased financial assets with credit deterioration since their origination. The new guidance will be effective for the Company starting in the first quarter of fiscal 2021. Early adoption is permitted starting in the first quarter of fiscal 2020. The Company is in the process of determine the effects the adoption will have on its consolidated financial statements as well as whether to adopt the new guidance early.

Fair Value of Financial Instrum

Fair Value of Financial Instruments	6 Months Ended
	Jun. 30, 2016
Fair Value Disclosures [Abstract]
Fair Value of Financial Instruments	Fair Value of Financial Instruments Fair value is defined as the price that would be received to sell an asset or paid to transfer a liability (an exit price) in an orderly transaction between market participants at the reporting date. The accounting guidance establishes a three-tiered hierarchy, which prioritizes the inputs used in the valuation methodologies in measuring fair value: • Level 1—Quoted prices in active markets for identical assets or liabilities. • Level 2—Inputs other than Level 1 that are observable, either directly or indirectly, such as quoted prices in markets that are not active, or other inputs that are observable or can be corroborated by observable market data for substantially the full term of the assets or liabilities. • Level 3—Unobservable inputs that are supported by little or no market activity and that are significant to the fair value of the assets or liabilities. The categorization of a financial instrument within the valuation hierarchy is based on the lowest level of input that is significant to the fair value measurement. The Company classifies its cash equivalents and investments within Level 1 and Level 2, as it uses quoted market prices or alternative pricing sources and models utilizing market observable inputs. The following tables set forth the fair value of the Company’s financial assets and liabilities by level within the fair value hierarchy (in thousands): As of June 30, 2016 Level 1 Level 2 Level 3 Fair Value Financial Assets Cash equivalents: Money market funds $ 2,762 $ — $ — $ 2,762 Short-term investments: U.S. Agency securities — 750 — 750 Corporate bonds — 3,747 — 3,747 Long-term investments: Corporate bonds — 263 — 263 Certificates of deposit 245 — — 245 Total $ 3,007 $ 4,760 $ — $ 7,767 As of December 31, 2015 Level 1 Level 2 Level 3 Fair Value Financial Assets Cash equivalents: Money market funds $ 1,342 $ — $ — $ 1,342 Short-term investments: U.S. Agency securities — 1,549 — 1,549 U.S. Treasury — 500 — 500 Corporate bonds — 7,763 — 7,763 Commercial paper — 500 — 500 Certificates of deposit 2,555 — — 2,555 Long-term investments: U.S. Agency securities — 497 — 497 Corporate bonds — 874 — 874 Certificates of deposit 2,119 — — 2,119 Total $ 6,016 $ 11,683 $ — $ 17,699 During the three and six months ended June 30, 2016 and 2015 , the Company did not have any transfers of financial assets measured at fair value on a recurring basis to or from Level 1, Level 2 or Level 3. The Company did not hold any Level 3 assets or liabilities as of June 30, 2016 , and December 31, 2015 . The carrying amounts of the Company’s cash equivalents, accounts receivable and accounts payable approximate fair value due to their relatively short maturities.

Balance Sheet Components

Balance Sheet Components	6 Months Ended
	Jun. 30, 2016
Organization, Consolidation and Presentation of Financial Statements [Abstract]
Balance Sheet Components	Balance Sheet Components Investments The Company's short-term and long-term investments as of June 30, 2016 are as follows (in thousands): Short-term Amortized Cost Gross Unrealized Gains Gross Unrealized Losses Fair Value U.S. Agency securities $ 750 $ — $ — $ 750 U.S. Treasury — — — — Corporate bonds 3,747 — — 3,747 Commercial paper — — — — Certificates of deposit — — — — Total $ 4,497 $ — $ — $ 4,497 Long-term Amortized Cost Gross Unrealized Gains Gross Unrealized Losses Fair Value U.S. Agency securities $ — $ — $ — $ — Corporate bonds 263 — — 263 Certificates of deposit 245 — — 245 Total $ 508 $ — $ — $ 508 The Company's short-term and long-term investments as of December 31, 2015 are as follows (in thousands): Short-term Amortized Cost Gross Unrealized Gains Gross Unrealized Losses Fair Value U.S. Agency securities $ 1,551 $ — $ (2 ) $ 1,549 U.S. Treasury 500 — — 500 Corporate bonds 7,776 — (13 ) 7,763 Commercial paper 500 — — 500 Certificates of deposit 2,555 — — 2,555 Total $ 12,882 $ — $ (15 ) $ 12,867 Long-term Amortized Cost Gross Unrealized Gains Gross Unrealized Losses Fair Value U.S. Agency securities $ 499 $ — $ (2 ) $ 497 U.S. Treasury — — — — Corporate bonds 878 — (4 ) 874 Certificates of deposit 2,119 — — 2,119 Total $ 3,496 $ — $ (6 ) $ 3,490 For each of the three and six months ended June 30, 2016 and 2015 , gains or losses realized on the sale of investments were insignificant. The contractual maturities of the Company's short-term and long-term investments as of June 30, 2016 , are as follows (in thousands): June 30, 2016 Amortized Cost Fair Value Due in one year or less $ 4,497 $ 4,497 Due in one year to five years 508 508 $ 5,005 $ 5,005 When evaluating the investments for other-than-temporary impairment, the Company reviews factors such as the length of time and extent to which fair value has been below the amortized cost basis, review of current market liquidity, interest rate risk, the financial condition of the issuer, as well as credit rating downgrades. The Company believes that the unrealized losses are not other-than-temporary. The Company does not have a foreseeable need to liquidate the portfolio and anticipates recovering the full cost of the securities either as market conditions improve, or as the securities mature. Inventory Inventory is stated at the lower of cost (which approximates actual cost on a first-in, first-out basis) or market. Inventory that is obsolete or in excess of forecasted usage is written down to its estimated net realizable value based on assumptions about future demand, new production introductions and market conditions. The components of inventory consist of the following (in thousands): June 30, December 31, Raw materials $ 8,091 $ 9,117 Finished goods 20,012 18,978 Total inventory $ 28,103 $ 28,095 Property and equipment, net Property and equipment, net comprised the following (in thousands): June 30, December 31, Lab equipment, tooling and molds $ 3,943 $ 3,228 Computer software 2,503 2,019 Computer equipment 2,543 2,757 Leasehold improvements 1,929 1,670 Furniture and fixtures 1,134 950 Vehicles 35 35 Construction in progress 1,950 1,945 Total property and equipment 14,037 12,604 Less: Accumulated depreciation and amortization (6,307 ) (5,635 ) Property and equipment, net $ 7,730 $ 6,969 The table above includes property and equipment acquired under capital leases which totaled $0.4 million as of both June 30, 2016 and December 31, 2015 . Depreciation and amortization expense related to property and equipment was $0.6 million and $1.2 million for the three and six months ended June 30, 2016 , respectively. 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. Accrued and Other Current Liabilities The following table shows the components of accrued liabilities (in thousands): June 30, December 31, Accrued payroll and employee related expenses $ 13,408 $ 14,887 Accrued marketing expenses 4,995 5,554 Accrued royalty 6,786 5,453 Sales and other taxes payable 3,853 3,703 Advance payments from customers 1,879 1,585 Accrued warranty 1,428 527 Accrued legal expenses 2,987 1,465 Other 2,293 1,517 Total accrued and other current liabilities $ 37,629 $ 34,691 Deferred Revenue The following table shows the components of deferred revenue, including long-term deferred revenue (in thousands): June 30, December 31, Deferred extended warranty revenue $ 3,072 $ 2,902 Deferred training revenue 3,793 3,115 Deferred product revenue 13,316 * 1,891 Total deferred revenue $ 20,181 $ 7,908 * A portion of the total balance consists of undelivered CoolAdvantage applicators that total $8.2 million as of June 30, 2016 and other deferrals that have not met the Company's revenue recognition policy. Deferred Extended Warranty Revenue The Company offers standard extended warranties which allows customers to receive service and support which extend beyond the contractual term of the product warranty. The Company recognizes these contracts over the life of the service period. Changes in the Company's deferred revenue, including long-term deferred revenue, related to extended warranties were as follows (in thousands): Three Months Ended Six Months Ended June 30, June 30, 2016 2015 2016 2015 Balance at the beginning of the period $ 2,901 $ 3,215 $ 2,902 $ 3,272 Extended warranties issued 1,215 1,073 2,219 1,806 Amortization (1,044 ) (903 ) (2,049 ) (1,693 ) Balance at the end of the period $ 3,072 $ 3,385 $ 3,072 $ 3,385 Product Warranties 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 3.2 years for control units and 1.2 years for applicators. The Company accrues for the estimated future costs of repair or replacement upon shipment. The warranty accrual is recorded to cost of revenue and is based upon historical trends in the volume of product failures during the warranty period and the cost to repair or replace the equipment. The Company bases product warranty costs on related freight, material, technical support labor and overhead costs. The estimated product warranty costs are assessed by considering historical costs and applying the experienced failure rates to the outstanding warranty period for products sold. The Company exercises judgment in estimating the expected product warranty costs, using data such as the actual product failure rates, and average repair costs, including freight, material, technical support labor, and overhead costs, for products returned under warranty. Changes in the Company's product warranty accrual was as follows (in thousands): Three Months Ended Six Months Ended June 30, June 30, 2016 2015 2016 2015 Balance at the beginning of the period $ 1,052 $ 440 $ 527 $ 569 Settlements of warranties (248 ) 33 (473 ) (67 ) Provision 624 (134 ) 1,374 (163 ) Balance at the end of the period $ 1,428 $ 339 $ 1,428 $ 339

Intangible Asset, Net

Intangible Asset, Net	6 Months Ended
	Jun. 30, 2016
Goodwill and Intangible Assets Disclosure [Abstract]
Intangible Asset, Net	Intangible Asset, Net The Company's intangible asset consists of an exclusive license agreement with Massachusetts General Hospital, or MGH, for commercializing patents and other technology. All milestone payments payable by the Company pursuant to the terms of the agreement subsequent to the date of the Food and Drug Administration, or FDA, clearance were capitalized as purchased technology when paid, and are subsequently amortized into cost of revenue using the straight-line method over the estimated remaining useful life of the technology, not to exceed the term of the agreement or the life of the patent. Intangible asset, net comprised the following (in thousands): June 30, December 31, Purchased technology $ 8,050 $ 8,050 Less: Accumulated amortization (3,283 ) (2,958 ) Intangible asset, net $ 4,767 $ 5,092 Amortization expense of the intangible asset was $0.2 million for both the three months ended June 30, 2016 and 2015 , and $0.3 million and $0.4 million for the six months ended June 30, 2016 and 2015 , respectively. The total estimated annual future amortization expense of this intangible asset as of June 30, 2016 , is as follows (in thousands): Fiscal Year 2016 (remaining 6 months) $ 325 2017 650 2018 650 2019 650 2020 650 Thereafter 1,842 Total $ 4,767

Related Party Transactions

Related Party Transactions	6 Months Ended
	Jun. 30, 2016
Related Party Transactions [Abstract]
Related Party Transactions	Related Party Transactions Brazilian Distribution Agreement The Company entered into a distribution agreement with ADVANCE Medical, Inc. and its wholly-owned subsidiaries, or ADVANCE, dated March 18, 2011 , as the Company's exclusive distributor of CoolSculpting in Brazil and Mexico, as amended on August 29, 2011 , February 27, 2012 and September 4, 2012 . The distribution agreement was further amended on August 15, 2014 , whereby ADVANCE is no longer a distributor in Mexico, effective November 13, 2014 . As the exclusive distributor in Brazil, ADVANCE is required to purchase a minimum quantity of the Company’s products each calendar quarter throughout the term of the distribution agreement which expires on December 31, 2018 . Venrock, a former principal stockholder of the Company, owns an equity interest in ADVANCE Medical, Ltd., the parent company of ADVANCE. Dr. Bryan E. Roberts, who was a member of the Company's Board of Directors until our annual meeting of stockholders in June 2016, 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 $0.4 million and $1.4 million for the three and six months ended June 30, 2016 , respectively, compared to $0.3 million and $1.6 million for the three and six months ended June 30, 2015 , respectively. The accounts receivable balance under this distribution agreement was zero and $1.7 million as of June 30, 2016 and December 31, 2015 , respectively.

Commitments and Contingencies

Commitments and Contingencies	6 Months Ended
	Jun. 30, 2016
Commitments and Contingencies Disclosure [Abstract]
Commitments and Contingencies	Commitments and Contingencies Operating Lease Obligations The Company leases facilities under non-cancellable operating leases with various expiration dates. In the three months ended June 30, 2016 , the Company entered into an office lease for approximately 109,701 square feet in Pleasanton California which extends through August 2027 and a manufacturing facility in Galway, Ireland which extends through June 2022 . The Company currently 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 , Seoul, South Korea, under a lease which extends through August 2016 , Reston, Virginia, under a lease which extends through September 2021 , and Galway, Ireland which extends through September 2016 , as well as office space in London, United Kingdom and Taipei, Taiwan that are leased on a month to month basis. 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 $0.7 million and $1.3 million for the three and six months ended June 30, 2016 , respectively, compared to $0.6 million and $1.1 million for the three and six months ended June 30, 2015 , respectively. Future minimum lease payments under the non-cancellable operating leases as of June 30, 2016 , are as follows (in thousands): Year Ending December 31, Amount 2016 (remaining 6 months) $ 1,340 2017 3,845 2018 5,317 2019 5,188 2020 4,943 Thereafter 31,785 Total future minimum lease payments $ 52,418 This compares to future minimum lease payments under the non-cancellable operating leases as of December 31, 2015 , of $7.3 million . 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, 2016 December 31, Computer equipment 3 $ 392 $ 382 Total capital leased equipment 392 382 Less: Accumulated depreciation and amortization (212 ) (149 ) Capital leased equipment, net $ 180 $ 233 Total amortization of assets acquired under capital leases was $32,000 and $0.1 million for the three and six months ended June 30, 2016 , respectively, which is included in total depreciation and amortization expense. Future minimum payments required under capital leases as of June 30, 2016 , are as follows (dollars in thousands): Year Ending December 31, Amount 2016 (remaining 6 months) $ 66 2017 141 Total future payments $ 207 Less: Amount representing interest 6 Present value of future minimum payments 201 Less: Current portion 127 Long term portion $ 74 Purchase Commitments The Company had non-cancellable purchase obligations to contract manufacturers and suppliers of $5.0 million and $5.9 million at June 30, 2016 and December 31, 2015 , respectively. Unrecognized Tax Benefits The Company's gross liability for unrecognized tax benefits totaled $0.3 million , including estimated interest and penalties, as of June 30, 2016 , 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 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 its exposure to these claims, but this insurance is subject to a cap on reimbursement. Product liability losses are, by their nature, uncertain and are based upon complex judgments and probabilities. The Company accrues for reported claims and estimates for incurred, but not reported claims, to the extent that such losses can be reasonably estimated. The Company determines its accruals for probable product liability losses based on various factors, including historical claims and settlement experience. The total amount of self-insured product liability claims settled in the three and six months ended June 30, 2016 were $0.6 million and $1.5 million , respectively. The total amount of self-insured product liability claims settled in the three and six months ended June 30, 2015 were not material. The amount of reported and estimated incurred but not known self-insured product liability claims pending was $2.0 million as of June 30, 2016 and $1.1 million as of December 31, 2015 , which is recorded as an accrual on the Company's condensed consolidated balance sheet and expected to be paid within one year. Indemnifications In the normal course of business, the Company enters into contracts that contain a variety of representations and warranties and provide for general indemnifications. The Company's exposure under these agreements is unknown because it involves claims that may be made against the Company in the future, but have not yet been made. To date, the Company has not paid any claims, and the Company believes that the estimated fair value of these indemnification obligations is minimal and it has not accrued any amounts for these obligations. Separation Agreements On February 25, 2016 , the Company's former Chief Financial Officer and the Company mutually agreed that the former Chief Financial Officer would cease to be an officer and employee of the Company which resulted in the Company incurring $0.3 million in termination benefits. In addition, stock-based compensation expense relating to the modifications of the former Chief Financial Officer's stock options and stock awards totaled $1.1 million , of which $0.7 million was recognized as stock-based compensation during the quarter ended March 31, 2016 and $0.4 million was recognized in the quarter ended June 30, 2016 .

Stock-Based Compensation Expens

Stock-Based Compensation Expense	6 Months Ended
	Jun. 30, 2016
Disclosure of Compensation Related Costs, Share-based Payments [Abstract]
Stock-Based Compensation Expense	Stock-Based Compensation Expense Share-Based Awards Available for Grant A summary of share-based awards available for grant is as follows: Shares Available for Grant Balance, December 31, 2015 3,517,305 Additional shares reserved 1,000,000 Options granted (302,236 ) Restricted stock units granted (761,790 ) Options canceled 7,509 Restricted stock units canceled 87,621 Restricted stock units withheld for tax 154,682 Balance, June 30, 2016 3,703,091 Stock Option Awards A summary of the stock option activity is as follows: Options Outstanding Number of Stock Options Outstanding Weighted- Average Exercise Price Balance, December 31, 2015 2,641,592 $ 6.47 Options granted 302,236 22.25 Options exercised (29,167 ) 6.30 Options canceled (7,509 ) 4.19 Balance, June 30, 2016 2,907,152 $ 8.47 Restricted Stock Activity Activity related to restricted stock units and awards is set forth below: Number of Units and Awards Weighted- Balance, December 31, 2015 1,312,651 $ 19.09 Restricted stock units granted 761,790 25.25 Restricted stock units vested (419,703 ) 14.68 Restricted stock units canceled (87,621 ) 21.44 Balance, June 30, 2016 1,567,117 $ 23.14 During the three and six months ended June 30, 2016 , 111,069 and 419,703 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, 2016 , the Company withheld 42,136 and 154,682 shares, respectively, based upon the Company's closing stock price on the vesting date to settle the employees' minimum statutory obligations for the applicable income and other employment taxes. 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. Subsequently, the Company remitted cash to the appropriate taxing authorities. Total payments for employee's tax obligations to the relevant taxing authorities was $1.2 million and $3.9 million for the three and six months ended June 30, 2016 , respectively. Total payments for employees' tax obligations to the relevant taxing authorities was $1.3 million and $5.6 million for the three and six months ended June 30, 2015 , 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, 2016 2015 2016 2015 Revenue $ 56 $ 68 $ 56 $ 148 Cost of revenue 258 149 490 283 Research and development 507 392 1,008 742 Sales and marketing 1,820 1,345 3,203 2,896 General and administrative 1,979 1,129 4,065 3,164 Total stock-based compensation $ 4,620 $ 3,083 $ 8,822 $ 7,233 As of June 30, 2016 , the total unrecognized compensation costs related to outstanding stock options, awards and employee stock purchases was $30.8 million , which is expected to be recognized using the straight-line attribution method over 3.70 years . Performance-Based Awards From time to time, the Company will issue performance-based stock options and restricted stock units to senior executives. During both the six months ended June 30, 2016 and 2015 , the Company granted 40,000 performance-based restricted stock units to a senior executive, which was accounted for as an equity award. The number of units that ultimately vest depends on achieving certain performance criteria and can range from 0% to 100% of the number of units granted. The performance criteria are specific to the roles of each of the executives and are set by the Compensation Committee of the Board of Directors. The performance-based restricted stock units have no dividend or voting rights during the performance period. Each of the performance-based restricted stock units represents the contingent right to receive one share of the Company's common stock if the vesting conditions are satisfied. Compensation expense related to these grants is based on the grant date fair value of the award. Stock-based compensation expense includes charges related to performance-based stock options and restricted stock units granted to certain executives. Stock-based compensation expense includes charges related to performance-based stock options and restricted stock units granted to certain executives. Stock-based compensation expense related to these stock options and restricted stock units was $0.4 million and $0.8 million for the three and six months ended June 30, 2016 , respectively, compared to $0.5 million and $2.0 million for the three and six months ended June 30, 2015 , 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, 2016 2015 2016 2015 Expected term N/A N/A 4.80 years 4.80 years Expected volatility N/A N/A 63 % 63 % Risk-free interest rate N/A N/A 1.21 % 1.29 % Expected dividend yield N/A N/A — % — % Expected Term . Subsequent to the Company's initial public offering of its common stock, or IPO, and through 2014, the expected term used was based on expected term of a group of similar entities, referred to as its “peer group.” In evaluating similarity, the Company considered factors such as industry, stage of life cycle and size. In 2015, the Company modified its approach by including its own historical data along with the expected term of the identified peer group companies. The Company will continue to apply this methodology until a sufficient amount of historical information regarding its own expected term becomes available. Volatility . Subsequent to the IPO, and through 2014, the Company continued to estimate its volatility based on its peer group as the Company did not have sufficient historical data regarding its specific volatility. In 2015, the Company modified its approach by including its own common stock trading history along with the volatility of the identified peer group companies. The expected stock price volatility is estimated using a combination of historical and peer group volatility to derive the expected volatility assumption. The Company believes the blended volatility is more representative of future stock price trends over the expected life of the options rather than just using historical or peer group volatility. The Company will continue to apply this methodology until a sufficient amount of historical information regarding the volatility of its own stock price becomes available. Risk-Free Interest Rate . The risk-free interest rate is based on U.S. Treasury zero-coupon issues with remaining terms similar to the expected term on the options. Dividend Yield . The Company has never paid any dividends and does not plan to pay dividends in the foreseeable future, and, therefore, used an expected dividend yield of zero in the valuation model. Forfeitures. The Company is required to estimate forfeitures at the time of grant, and revise those estimates in subsequent periods if actual forfeitures differ from those estimates. The Company uses historical data to estimate pre-vesting option forfeitures and to record stock-based compensation expense only for those awards that are expected to vest. To the extent actual forfeitures differ from the estimates, the difference will be recorded as a cumulative adjustment in the period that the estimates are revised. No stock options were granted in either of the three months ended June 30, 2016 or June 30, 2015 . During the six months ended June 30, 2016 , the Company granted 302,236 stock options to employees with a weighted-average grant date fair value of $22.25 per share. 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, respectively. During the three and six months ended June 30, 2016 , the Company granted 382,221 and 761,790 restricted stock units, respectively, to employees with a weighted-average grant date fair value of $27.71 and $25.25 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. During the six months ended June 30, 2016 , employees purchased 66,857 shares under the Company's employee stock purchase plan, or ESPP, at a weighted average exercise price of $24.19 . As of June 30, 2016 , the unrecognized compensation cost related to the ESPP was $0.5 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, 2016 , the Company granted stock-based awards to a non-employee that vest over one year. Stock-based compensation expense related to non-employee grants was $0.1 million for both the three and six months ended June 30, 2016 , 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, 2016 , in the condensed consolidated statements of operations. Stock-based compensation expense for non-employees was $0.1 million and $0.3 million for the three and six months ended June 30, 2015 , respectively.

Net Income (Loss) Per Share

Net Income (Loss) Per Share	6 Months Ended
	Jun. 30, 2016
Earnings Per Share [Abstract]
Net Income (Loss) Per Share	Net Income (Loss) per Share Basic net income (loss) per share is computed using the weighted average number of common shares outstanding during the period. Diluted net income per share is computed using the treasury stock method to calculate the weighted average number of common shares and, if dilutive, potential common shares outstanding during the period. Potential dilutive common shares include unvested restricted stock awards and units and incremental common shares issuable upon the exercise of stock options, less shares from assumed proceeds. The assumed proceeds calculation includes actual proceeds to be received from the employee upon exercise, the average unrecognized stock compensation cost during the period and any tax benefits that will be credited upon exercise to additional paid-in capital. 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, 2016 2015 2016 2015 Numerator Net income (loss) (in thousands) $ (4,902 ) $ 1,178 $ (14,772 ) $ (951 ) Denominator Weighted average shares of common stock outstanding used in computing net income (loss) per share, basic 39,493,665 38,649,873 39,391,259 38,517,817 Dilutive effect of incremental shares and share equivalents — 2,991,787 — — Weighted average shares of common stock outstanding used in computing net income (loss) per share, diluted 39,493,665 41,641,660 39,391,259 38,517,817 Net income (loss) per share: Net income (loss) per share, basic $ (0.12 ) $ 0.03 $ (0.38 ) $ (0.02 ) Net income (loss) per share, diluted $ (0.12 ) $ 0.03 $ (0.38 ) $ (0.02 ) 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, 2016 2015 2016 2015 Options to purchase common stock 347,848 45,622 2,907,152 2,958,922 Restricted stock units 98,586 116,035 1,567,117 1,419,718 Common stock issuable pursuant to the ESPP — — — 722 Total 446,434 161,657 4,474,269 4,379,362

Income Taxes

Income Taxes	6 Months Ended
	Jun. 30, 2016
Income Tax Disclosure [Abstract]
Income Taxes	Income Taxes The Company recorded income tax expense of $2.8 million and $2.1 million for the three and six months ended June 30, 2016 , respectively, compared to income tax expense of $43,000 and $71,000 for the three and six months ended June 30, 2015 , respectively. The income tax expense for the three and six months ended June 30, 2016 and 2015 reflects the mixture and distribution of pre-tax income in the Company's operating jurisdictions. The Company continues to maintain a valuation allowance on its deferred tax assets relating to its California research and development credit. The Company generated pre-tax year-to-date ordinary losses in its zero-rate jurisdiction, and the Company has elected to exclude these pre-tax year-to-date ordinary losses from its zero-rate jurisdiction from its estimated effective tax rate computations. The exclusion is based on the notion that a loss in a zero-rate jurisdiction ultimately will not provide the Company a tax benefit. At June 30, 2016 , the Company had $3.1 million of unrecognized tax benefits. The Company recognizes interest and penalties related to uncertain tax positions as part of the income tax provision. To date, such interest and penalties have not been material. During the fourth quarter of the year ended December 31, 2015, the Company released its valuation allowance against U.S. federal and state deferred tax assets, with the exception of the California research and development credit carryforwards. Based upon the evaluation of positive and negative evidence supporting the realizability of deferred tax assets as of the quarter ended June 30, 2016 , there remains sufficient positive evidence to support the realization of U.S. federal and state deferred tax assets, with the exception of California research and development credit carryforwards. The Company files annual income tax returns in multiple taxing jurisdictions around the world, including the U.S. federal and state jurisdictions, Ireland and the United Kingdom. A number of years may elapse before an uncertain tax position is audited and finally resolved. While it is often difficult to predict the final outcome or the timing of resolution of any particular uncertain tax position, the Company believes that its reserves for income taxes reflect the most likely outcome. The Company adjusts these reserves, as well as the related interest, in light of changing facts and circumstances. Settlement of any particular position could require the use of cash. As of June 30, 2016 , changes to the Company's uncertain tax positions in the next 12 months that are reasonably possible are not expected to have a significant impact on the Company's financial position or results of operations.

Segment Information

Segment Information	6 Months Ended
	Jun. 30, 2016
Segment Reporting [Abstract]
Segment Information	Segment Information Operating segments are defined as components of an enterprise about which separate financial information is available that is evaluated regularly by the chief operating decision maker, or decision making group, in deciding how to allocate resources and in assessing performance. The Company’s chief operating decision maker is its Chief Executive Officer. The Company has one business activity and there are no segment managers who are held accountable for operations. Accordingly, the Company has a single reportable segment structure. All of the Company’s principal operations and decision-making functions are located in the United States. The Company’s revenue by geographic region, based on the location to where the product was shipped, is summarized as follows (in thousands): Three Months Ended Six Months Ended June 30, June 30, 2016 2015 2016 2015 North America $ 74,014 $ 51,436 $ 125,483 $ 86,665 International 15,451 12,995 28,451 29,324 Total $ 89,465 $ 64,431 $ 153,934 $ 115,989 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 $71.6 million and $122.9 million for the three and six months ended June 30, 2016 , respectively, compared to $46.4 million and $79.5 million for the three and six months ended June 30, 2015 , 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, 2016 2015 2016 2015 System revenue $ 39,449 $ 32,047 $ 64,138 $ 58,203 Consumable revenue 50,016 32,384 89,796 57,786 Total $ 89,465 $ 64,431 $ 153,934 $ 115,989 As of June 30, 2016 and December 31, 2015, property and equipment, net, by geographical area are presented below (in thousands): June 30, December 31, 2016 2015 U.S. $ 5,873 $ 6,691 Ireland 1,589 — Other 268 278 Total $ 7,730 $ 6,969

Basis of Presentation and Sum17

Basis of Presentation and Summary of Significant Accounting Policies (Policies)	6 Months Ended
	Jun. 30, 2016
Organization, Consolidation and Presentation of Financial Statements [Abstract]
Basis of Presentation	Basis of Presentation The accompanying interim condensed consolidated financial statements of ZELTIQ Aesthetics, Inc. (the "Company") are unaudited. These interim condensed consolidated financial statements have been prepared in accordance with generally accepted accounting principles in the United States of America, or GAAP, and the applicable rules and regulations of the Securities and Exchange Commission, or SEC, for interim financial information. Accordingly, they do not include all of the information and footnotes required by GAAP for complete financial statements. The December 31, 2015 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, 2016 , results of operations for the three and six months ended June 30, 2016 and 2015 , comprehensive income (loss) for the three and six months ended June 30, 2016 and 2015 , and cash flows for the six months ended June 30, 2016 and 2015 . The interim results for the three and six months ended June 30, 2016 , are not necessarily indicative of the results that may be expected for the year ending December 31, 2016 , or for any other future annual or interim period. The information included in this Quarterly Report on Form 10-Q should be read in conjunction with “Management’s Discussion and Analysis of Financial Condition and Results of Operations," “Quantitative and Qualitative Disclosures About Market Risk” and the Consolidated Financial Statements and notes thereto included in Items 7, 7A and 8, respectively, in the Company's Annual Report on Form 10-K for the year ended December 31, 2015 .
Principles of Consolidation	Principles of Consolidation The condensed consolidated financial statements include the accounts of the Company and its wholly-owned subsidiaries. All significant intercompany accounts and transactions have been eliminated.
Foreign Currency	The functional currency of the Company’s international subsidiaries is evaluated on a case-by-case basis and has been determined to be the 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 income (expense), net.
Use of Estimates	Use of Estimates The preparation of financial statements in conformity with GAAP requires management to make certain estimates and assumptions that affect the reported amounts of assets and liabilities and disclosure of contingent assets and liabilities at the date of the financial statements and the reported amounts of revenue and expenses during the reported periods. The primary estimates underlying the Company's financial statements include the value of revenue elements, product warranty, inventory valuation, allowance for doubtful accounts receivable, assumptions regarding variables used in calculating the fair value of the Company's equity awards, fair value of investments, useful lives of intangibles, income taxes and contingent liabilities. Actual results could differ from those estimates.
Critical Accounting Policies	Critical Accounting Policies There have been no changes to the Company’s critical accounting policies during the six months ended June 30, 2016 , as compared to the critical accounting policies described in the Company’s Annual Report on Form 10-K for the year ended December 31, 2015 .
Recent Accounting Pronouncements	Recent Accounting Pronouncements On May 28, 2014 , the Financial Accounting Standards Board, or FASB, issued Accounting Standards Update No. 2014-09, Revenue from Contracts with Customers: Topic 606 and issued subsequent amendments to the initial guidance in August 2015, March 2016, April 2016 and May 2016 within ASU 2015-14, ASU 2016-08, ASU 2016-10 and ASU 2016-12, respectively (ASU 2014-09, ASU 2015-14, ASU 2016-08, ASU 2016-10 and ASU 2016-12 collectively, Topic 606). Topic 606 supersedes nearly all existing revenue recognition guidance under GAAP. The objective of this update is to provide a single, comprehensive revenue recognition model for all contracts with customers to improve comparability within industries, across industries, and across capital markets. This standard update contains principles that the Company will apply to determine the measurement of revenue and timing of when it is recognized. This guidance allows for two methods of adoption: (a) full retrospective adoption, meaning the guidance is applied to all periods presented, or (b) modified retrospective adoption, meaning the cumulative effect of applying this guidance is recognized as an adjustment to the fiscal 2018 opening accumulated deficit balance. The Company expects to adopt this guidance effective January 1, 2018 , and is currently evaluating the two adoption methods as well as the impact this new guidance will have on its consolidated financial statements and related disclosures. In July 2015 , the FASB issued Accounting Standards Update No. 2015-11 to amend ASC Topic 330, Inventory ("ASC 330") to simplify the measurement of inventory. The amendments require that an entity measure inventory at the lower of cost and net realizable value instead of the lower of cost and market. This guidance is effective for public companies for years, and interim periods within those years, beginning on or after December 15, 2016, with earlier application permitted as of the beginning of an interim or annual reporting period. This guidance will be effective for the Company beginning in its first quarter of fiscal 2017. The Company is currently evaluating the impact this new guidance will have on its consolidated financial statements and related disclosures. In February 2016, the FASB issued Accounting Standards Update No. 2016-02, Leases. This ASU requires lease assets and lease liabilities arising from leases, including operating leases, to be recognized on the balance sheet. ASU 2016-02 will become effective for the Company on January 1, 2019, and requires adoption using a modified retrospective approach. The Company is currently evaluating the impact of this guidance on its consolidated financial statements and related disclosures. In March 30, 2016, the FASB issued Accounting Standards Update No. 2016-09, Improvements to Employee Share-Based Payment Accounting. This ASU will change how companies account for certain aspects of share-based payments to employees. This guidance will require all income tax effects of awards to be recognized in the income statement when the awards vest or are settled. It also will allow an employer to repurchase more of an employee's shares than it can today for tax withholding purposes without triggering liability accounting and to make a policy election to account for forfeitures as they occur. The guidance is effective for public business entities for fiscal years beginning after December 2016, and interim periods within those years, with earlier application permitted in any annual or interim period for which financial statements haven't been issued or made available for issuance, but all of the guidance must be adopted in the same period. The Company is currently evaluating the impact this new guidance will have on its consolidated financial statements and related disclosures. In May 2016, the FASB issued ASU No. 2016-11, “Revenue Recognition (Topic 605) and Derivatives and Hedging (Topic 815): Rescission of SEC Guidance Because of Accounting Standards Updates 2014-09 and 2014-16 pursuant to Staff announcements at the March 3, 2016 EITF Meeting” (“ASU 2016-11”). The purpose of ASU 2016-11 is to rescind from the FASB Accounting Standards Codification certain SEC paragraphs as a result of two SEC Staff Announcements at the March 3, 2016 meeting. For public entities, the amendments in ASU 2016-11 related to Topic 605 are effective for interim and annual reporting periods beginning after December 15, 2017 and amendments related to Topic 815 are effective for interim and annual reporting periods beginning after December 15, 2015. The Company is currently assessing the impact of ASU 2016-11 on its condensed consolidated financial statements. In June 2016, the FASB issued ASU 2016-13, "Financial Instruments – Credit Losses." This ASU changes the accounting for recognizing impairments of financial assets. Under the new guidance, credit losses for certain types of financial instruments will be estimated based on expected losses. The new guidance also modifies the impairment models for available-for-sale debt securities and for purchased financial assets with credit deterioration since their origination. The new guidance will be effective for the Company starting in the first quarter of fiscal 2021. Early adoption is permitted starting in the first quarter of fiscal 2020. The Company is in the process of determine the effects the adoption will have on its consolidated financial statements as well as whether to adopt the new guidance early.
Fair Value of Financial Instruments	Fair Value of Financial Instruments Fair value is defined as the price that would be received to sell an asset or paid to transfer a liability (an exit price) in an orderly transaction between market participants at the reporting date. The accounting guidance establishes a three-tiered hierarchy, which prioritizes the inputs used in the valuation methodologies in measuring fair value: • Level 1—Quoted prices in active markets for identical assets or liabilities. • Level 2—Inputs other than Level 1 that are observable, either directly or indirectly, such as quoted prices in markets that are not active, or other inputs that are observable or can be corroborated by observable market data for substantially the full term of the assets or liabilities. • Level 3—Unobservable inputs that are supported by little or no market activity and that are significant to the fair value of the assets or liabilities. The categorization of a financial instrument within the valuation hierarchy is based on the lowest level of input that is significant to the fair value measurement. The Company classifies its cash equivalents and investments within Level 1 and Level 2, as it uses quoted market prices or alternative pricing sources and models utilizing market observable inputs.
Inventory	Inventory Inventory is stated at the lower of cost (which approximates actual cost on a first-in, first-out basis) or market. Inventory that is obsolete or in excess of forecasted usage is written down to its estimated net realizable value based on assumptions about future demand, new production introductions and market conditions.

Fair Value of Financial Instr18

Fair Value of Financial Instruments (Tables)	6 Months Ended
	Jun. 30, 2016
Fair Value Disclosures [Abstract]
Fair Value of Financial Assets and Liabilities by Level Within Fair Value Hierarchy	The following tables set forth the fair value of the Company’s financial assets and liabilities by level within the fair value hierarchy (in thousands): As of June 30, 2016 Level 1 Level 2 Level 3 Fair Value Financial Assets Cash equivalents: Money market funds $ 2,762 $ — $ — $ 2,762 Short-term investments: U.S. Agency securities — 750 — 750 Corporate bonds — 3,747 — 3,747 Long-term investments: Corporate bonds — 263 — 263 Certificates of deposit 245 — — 245 Total $ 3,007 $ 4,760 $ — $ 7,767 As of December 31, 2015 Level 1 Level 2 Level 3 Fair Value Financial Assets Cash equivalents: Money market funds $ 1,342 $ — $ — $ 1,342 Short-term investments: U.S. Agency securities — 1,549 — 1,549 U.S. Treasury — 500 — 500 Corporate bonds — 7,763 — 7,763 Commercial paper — 500 — 500 Certificates of deposit 2,555 — — 2,555 Long-term investments: U.S. Agency securities — 497 — 497 Corporate bonds — 874 — 874 Certificates of deposit 2,119 — — 2,119 Total $ 6,016 $ 11,683 $ — $ 17,699

Balance Sheet Components (Table

Balance Sheet Components (Tables)	6 Months Ended
	Jun. 30, 2016
Organization, Consolidation and Presentation of Financial Statements [Abstract]
Schedule of Investments	The Company's short-term and long-term investments as of June 30, 2016 are as follows (in thousands): Short-term Amortized Cost Gross Unrealized Gains Gross Unrealized Losses Fair Value U.S. Agency securities $ 750 $ — $ — $ 750 U.S. Treasury — — — — Corporate bonds 3,747 — — 3,747 Commercial paper — — — — Certificates of deposit — — — — Total $ 4,497 $ — $ — $ 4,497 Long-term Amortized Cost Gross Unrealized Gains Gross Unrealized Losses Fair Value U.S. Agency securities $ — $ — $ — $ — Corporate bonds 263 — — 263 Certificates of deposit 245 — — 245 Total $ 508 $ — $ — $ 508 The Company's short-term and long-term investments as of December 31, 2015 are as follows (in thousands): Short-term Amortized Cost Gross Unrealized Gains Gross Unrealized Losses Fair Value U.S. Agency securities $ 1,551 $ — $ (2 ) $ 1,549 U.S. Treasury 500 — — 500 Corporate bonds 7,776 — (13 ) 7,763 Commercial paper 500 — — 500 Certificates of deposit 2,555 — — 2,555 Total $ 12,882 $ — $ (15 ) $ 12,867 Long-term Amortized Cost Gross Unrealized Gains Gross Unrealized Losses Fair Value U.S. Agency securities $ 499 $ — $ (2 ) $ 497 U.S. Treasury — — — — Corporate bonds 878 — (4 ) 874 Certificates of deposit 2,119 — — 2,119 Total $ 3,496 $ — $ (6 ) $ 3,490
Schedule of Contractual Maturities of Investments	The contractual maturities of the Company's short-term and long-term investments as of June 30, 2016 , are as follows (in thousands): June 30, 2016 Amortized Cost Fair Value Due in one year or less $ 4,497 $ 4,497 Due in one year to five years 508 508 $ 5,005 $ 5,005
Schedule of Inventory	The components of inventory consist of the following (in thousands): June 30, December 31, Raw materials $ 8,091 $ 9,117 Finished goods 20,012 18,978 Total inventory $ 28,103 $ 28,095
Schedule of Property and Equipment, Net	Property and equipment, net comprised the following (in thousands): June 30, December 31, Lab equipment, tooling and molds $ 3,943 $ 3,228 Computer software 2,503 2,019 Computer equipment 2,543 2,757 Leasehold improvements 1,929 1,670 Furniture and fixtures 1,134 950 Vehicles 35 35 Construction in progress 1,950 1,945 Total property and equipment 14,037 12,604 Less: Accumulated depreciation and amortization (6,307 ) (5,635 ) Property and equipment, net $ 7,730 $ 6,969
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 $ 13,408 $ 14,887 Accrued marketing expenses 4,995 5,554 Accrued royalty 6,786 5,453 Sales and other taxes payable 3,853 3,703 Advance payments from customers 1,879 1,585 Accrued warranty 1,428 527 Accrued legal expenses 2,987 1,465 Other 2,293 1,517 Total accrued and other current liabilities $ 37,629 $ 34,691
Schedule of Deferred Revenue	The following table shows the components of deferred revenue, including long-term deferred revenue (in thousands): June 30, December 31, Deferred extended warranty revenue $ 3,072 $ 2,902 Deferred training revenue 3,793 3,115 Deferred product revenue 13,316 * 1,891 Total deferred revenue $ 20,181 $ 7,908 * A portion of the total balance consists of undelivered CoolAdvantage applicators that total $8.2 million as of June 30, 2016 and other deferrals that have not met the Company's revenue recognition policy.
Schedule of Product Warranty Accrual	Changes in the Company's deferred revenue, including long-term deferred revenue, related to extended warranties were as follows (in thousands): Three Months Ended Six Months Ended June 30, June 30, 2016 2015 2016 2015 Balance at the beginning of the period $ 2,901 $ 3,215 $ 2,902 $ 3,272 Extended warranties issued 1,215 1,073 2,219 1,806 Amortization (1,044 ) (903 ) (2,049 ) (1,693 ) Balance at the end of the period $ 3,072 $ 3,385 $ 3,072 $ 3,385 Changes in the Company's product warranty accrual was as follows (in thousands): Three Months Ended Six Months Ended June 30, June 30, 2016 2015 2016 2015 Balance at the beginning of the period $ 1,052 $ 440 $ 527 $ 569 Settlements of warranties (248 ) 33 (473 ) (67 ) Provision 624 (134 ) 1,374 (163 ) Balance at the end of the period $ 1,428 $ 339 $ 1,428 $ 339

Intangible Asset, Net (Tables)

Intangible Asset, Net (Tables)	6 Months Ended
	Jun. 30, 2016
Goodwill and Intangible Assets Disclosure [Abstract]
Schedule of Intangible Asset, Net	Intangible asset, net comprised the following (in thousands): June 30, December 31, Purchased technology $ 8,050 $ 8,050 Less: Accumulated amortization (3,283 ) (2,958 ) Intangible asset, net $ 4,767 $ 5,092
Schedule of Total Estimated Annual Future Amortization Expense	The total estimated annual future amortization expense of this intangible asset as of June 30, 2016 , is as follows (in thousands): Fiscal Year 2016 (remaining 6 months) $ 325 2017 650 2018 650 2019 650 2020 650 Thereafter 1,842 Total $ 4,767

Commitments and Contingencies (

Commitments and Contingencies (Tables)	6 Months Ended
	Jun. 30, 2016
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, 2016 , are as follows (in thousands): Year Ending December 31, Amount 2016 (remaining 6 months) $ 1,340 2017 3,845 2018 5,317 2019 5,188 2020 4,943 Thereafter 31,785 Total future minimum lease payments $ 52,418
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, 2016 December 31, Computer equipment 3 $ 392 $ 382 Total capital leased equipment 392 382 Less: Accumulated depreciation and amortization (212 ) (149 ) Capital leased equipment, net $ 180 $ 233
Schedule of Future Minimum Payments Required Under Capital Leases	Future minimum payments required under capital leases as of June 30, 2016 , are as follows (dollars in thousands): Year Ending December 31, Amount 2016 (remaining 6 months) $ 66 2017 141 Total future payments $ 207 Less: Amount representing interest 6 Present value of future minimum payments 201 Less: Current portion 127 Long term portion $ 74

Stock-Based Compensation Expe22

Stock-Based Compensation Expense (Tables)	6 Months Ended
	Jun. 30, 2016
Disclosure of Compensation Related Costs, Share-based Payments [Abstract]
Stock Options Activity	A summary of share-based awards available for grant is as follows: Shares Available for Grant Balance, December 31, 2015 3,517,305 Additional shares reserved 1,000,000 Options granted (302,236 ) Restricted stock units granted (761,790 ) Options canceled 7,509 Restricted stock units canceled 87,621 Restricted stock units withheld for tax 154,682 Balance, June 30, 2016 3,703,091 Stock Option Awards A summary of the stock option activity is as follows: Options Outstanding Number of Stock Options Outstanding Weighted- Average Exercise Price Balance, December 31, 2015 2,641,592 $ 6.47 Options granted 302,236 22.25 Options exercised (29,167 ) 6.30 Options canceled (7,509 ) 4.19 Balance, June 30, 2016 2,907,152 $ 8.47
Restricted Stock Activity	Activity related to restricted stock units and awards is set forth below: Number of Units and Awards Weighted- Balance, December 31, 2015 1,312,651 $ 19.09 Restricted stock units granted 761,790 25.25 Restricted stock units vested (419,703 ) 14.68 Restricted stock units canceled (87,621 ) 21.44 Balance, June 30, 2016 1,567,117 $ 23.14
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, 2016 2015 2016 2015 Revenue $ 56 $ 68 $ 56 $ 148 Cost of revenue 258 149 490 283 Research and development 507 392 1,008 742 Sales and marketing 1,820 1,345 3,203 2,896 General and administrative 1,979 1,129 4,065 3,164 Total stock-based compensation $ 4,620 $ 3,083 $ 8,822 $ 7,233
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, 2016 2015 2016 2015 Expected term N/A N/A 4.80 years 4.80 years Expected volatility N/A N/A 63 % 63 % Risk-free interest rate N/A N/A 1.21 % 1.29 % Expected dividend yield N/A N/A — % — %

Net Income (Loss) Per Share (Ta

Net Income (Loss) Per Share (Tables)	6 Months Ended
	Jun. 30, 2016
Earnings Per Share [Abstract]
Schedule of Earnings Per Share, Basic and Diluted	A reconciliation of the numerator and denominator used in the calculation of the basic and diluted net income (loss) per share is as follows: Three Months Ended Six Months Ended June 30, June 30, 2016 2015 2016 2015 Numerator Net income (loss) (in thousands) $ (4,902 ) $ 1,178 $ (14,772 ) $ (951 ) Denominator Weighted average shares of common stock outstanding used in computing net income (loss) per share, basic 39,493,665 38,649,873 39,391,259 38,517,817 Dilutive effect of incremental shares and share equivalents — 2,991,787 — — Weighted average shares of common stock outstanding used in computing net income (loss) per share, diluted 39,493,665 41,641,660 39,391,259 38,517,817 Net income (loss) per share: Net income (loss) per share, basic $ (0.12 ) $ 0.03 $ (0.38 ) $ (0.02 ) Net income (loss) per share, diluted $ (0.12 ) $ 0.03 $ (0.38 ) $ (0.02 )
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, 2016 2015 2016 2015 Options to purchase common stock 347,848 45,622 2,907,152 2,958,922 Restricted stock units 98,586 116,035 1,567,117 1,419,718 Common stock issuable pursuant to the ESPP — — — 722 Total 446,434 161,657 4,474,269 4,379,362

Segment Information (Tables)

Segment Information (Tables)	6 Months Ended
	Jun. 30, 2016
Segment Reporting [Abstract]
Revenue By Geographic Region	The Company’s revenue by geographic region, based on the location to where the product was shipped, is summarized as follows (in thousands): Three Months Ended Six Months Ended June 30, June 30, 2016 2015 2016 2015 North America $ 74,014 $ 51,436 $ 125,483 $ 86,665 International 15,451 12,995 28,451 29,324 Total $ 89,465 $ 64,431 $ 153,934 $ 115,989
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, 2016 2015 2016 2015 System revenue $ 39,449 $ 32,047 $ 64,138 $ 58,203 Consumable revenue 50,016 32,384 89,796 57,786 Total $ 89,465 $ 64,431 $ 153,934 $ 115,989
Property and Equipment, Net, by Geographical Area	As of June 30, 2016 and December 31, 2015, property and equipment, net, by geographical area are presented below (in thousands): June 30, December 31, 2016 2015 U.S. $ 5,873 $ 6,691 Ireland 1,589 — Other 268 278 Total $ 7,730 $ 6,969

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, 2016	Mar. 31, 2016	Jun. 30, 2015	Jun. 30, 2016	Jun. 30, 2015
Error Corrections and Prior Period Adjustments Restatement [Line Items]
Net loss	$ 4,902		$ (1,178)	$ 14,772	$ 951
Cost of revenue	27,521		18,116	45,750	32,494
Other operating expenses	65,470		44,662	$ 122,874	$ 83,536
Correcting Adjustment to Increase Cost of Revenue, Operating Expenses and Reduction to Inventory [Member] | Restatement Adjustment [Member]
Error Corrections and Prior Period Adjustments Restatement [Line Items]
Net loss	400
Cost of revenue	200
Other operating expenses	$ 200
Correcting Adjustment to Increase Cost of Revenue, Warranty Accrual and Reduction to Other Operating Expenses [Member] | Restatement Adjustment [Member]
Error Corrections and Prior Period Adjustments Restatement [Line Items]
Net loss		$ 200
Cost of revenue		400
Other operating expenses		$ (200)
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 2013 [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 2014 [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 2015 [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) - Customer Concentration Risk [Member] - customer	3 Months Ended		6 Months Ended		12 Months Ended
	Jun. 30, 2016	Jun. 30, 2015	Jun. 30, 2016	Jun. 30, 2015	Dec. 31, 2015
Accounts Receivable [Member]
Concentration Risk [Line Items]
Concentration risk (customer)					1
Concentration risk (percent)					10.00%
Revenue [Member]
Concentration Risk [Line Items]
Concentration risk (customer)	1	1	0	1
Concentration risk (percent)	12.00%	17.00%		14.00%

Fair Value of Financial Instr27

Fair Value of Financial Instruments (Details) - USD ($) $ in Thousands	Jun. 30, 2016	Dec. 31, 2015
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Investments, fair value disclosure	$ 5,005
Assets, fair value disclosure	7,767	$ 17,699
Money market funds [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Cash equivalents, fair value disclosure	2,762	1,342
Short-term Investments [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Investments, fair value disclosure	4,497	12,867
Short-term Investments [Member] | U.S. Agency securities [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Investments, fair value disclosure	750	1,549
Short-term Investments [Member] | U.S. Treasury [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Investments, fair value disclosure	0	500
Short-term Investments [Member] | Corporate bonds [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Investments, fair value disclosure	3,747	7,763
Short-term Investments [Member] | Commercial paper [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Investments, fair value disclosure	0	500
Short-term Investments [Member] | Certificates of deposit [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Investments, fair value disclosure	0	2,555
Long-term Investments [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Investments, fair value disclosure	508	3,490
Long-term Investments [Member] | U.S. Agency securities [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Investments, fair value disclosure	0	497
Long-term Investments [Member] | U.S. Treasury [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Investments, fair value disclosure		0
Long-term Investments [Member] | Corporate bonds [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Investments, fair value disclosure	263	874
Long-term Investments [Member] | Certificates of deposit [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Investments, fair value disclosure	245	2,119
Level 1 [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Assets, fair value disclosure	3,007	6,016
Level 1 [Member] | Money market funds [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Cash equivalents, fair value disclosure	2,762	1,342
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]
Investments, 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]
Investments, fair value disclosure		0
Level 1 [Member] | Short-term Investments [Member] | Corporate bonds [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Investments, 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]
Investments, 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]
Investments, fair value disclosure		2,555
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]
Investments, 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]
Investments, 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]
Investments, fair value disclosure	245	2,119
Level 2 [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Assets, fair value disclosure	4,760	11,683
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]
Investments, fair value disclosure	750	1,549
Level 2 [Member] | Short-term Investments [Member] | U.S. Treasury [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Investments, fair value disclosure		500
Level 2 [Member] | Short-term Investments [Member] | Corporate bonds [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Investments, fair value disclosure	3,747	7,763
Level 2 [Member] | Short-term Investments [Member] | Commercial paper [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Investments, fair value disclosure		500
Level 2 [Member] | Short-term Investments [Member] | Certificates of deposit [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Investments, fair value disclosure		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]
Investments, fair value disclosure		497
Level 2 [Member] | Long-term Investments [Member] | Corporate bonds [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Investments, fair value disclosure	263	874
Level 2 [Member] | Long-term Investments [Member] | Certificates of deposit [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Investments, 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
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]
Investments, 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]
Investments, fair value disclosure		0
Level 3 [Member] | Short-term Investments [Member] | Corporate bonds [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Investments, 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]
Investments, 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]
Investments, fair value disclosure		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]
Investments, 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]
Investments, 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]
Investments, fair value disclosure	$ 0	$ 0

Balance Sheet Components - Inve

Balance Sheet Components - Investments (Details) - USD ($) $ in Thousands	Jun. 30, 2016	Dec. 31, 2015
Schedule of Available-for-sale Securities [Line Items]
Amortized Cost	$ 5,005
Fair Value	5,005
Short-term Investments [Member]
Schedule of Available-for-sale Securities [Line Items]
Amortized Cost	4,497	$ 12,882
Gross Unrealized Gains	0	0
Gross Unrealized Losses	0	(15)
Fair Value	4,497	12,867
Short-term Investments [Member] | U.S. Agency securities [Member]
Schedule of Available-for-sale Securities [Line Items]
Amortized Cost	750	1,551
Gross Unrealized Gains	0	0
Gross Unrealized Losses	0	(2)
Fair Value	750	1,549
Short-term Investments [Member] | U.S. Treasury [Member]
Schedule of Available-for-sale Securities [Line Items]
Amortized Cost	0	500
Gross Unrealized Gains	0	0
Gross Unrealized Losses	0	0
Fair Value	0	500
Short-term Investments [Member] | Corporate bonds [Member]
Schedule of Available-for-sale Securities [Line Items]
Amortized Cost	3,747	7,776
Gross Unrealized Gains	0	0
Gross Unrealized Losses	0	(13)
Fair Value	3,747	7,763
Short-term Investments [Member] | Commercial paper [Member]
Schedule of Available-for-sale Securities [Line Items]
Amortized Cost	0	500
Gross Unrealized Gains	0	0
Gross Unrealized Losses	0	0
Fair Value	0	500
Short-term Investments [Member] | Certificates of deposit [Member]
Schedule of Available-for-sale Securities [Line Items]
Amortized Cost	0	2,555
Gross Unrealized Gains	0	0
Gross Unrealized Losses	0	0
Fair Value	0	2,555
Long-term Investments [Member]
Schedule of Available-for-sale Securities [Line Items]
Amortized Cost	508	3,496
Gross Unrealized Gains	0	0
Gross Unrealized Losses	0	(6)
Fair Value	508	3,490
Long-term Investments [Member] | U.S. Agency securities [Member]
Schedule of Available-for-sale Securities [Line Items]
Amortized Cost	0	499
Gross Unrealized Gains	0	0
Gross Unrealized Losses	0	(2)
Fair Value	0	497
Long-term Investments [Member] | U.S. Treasury [Member]
Schedule of Available-for-sale Securities [Line Items]
Amortized Cost		0
Gross Unrealized Gains		0
Gross Unrealized Losses		0
Fair Value		0
Long-term Investments [Member] | Corporate bonds [Member]
Schedule of Available-for-sale Securities [Line Items]
Amortized Cost	263	878
Gross Unrealized Gains	0	0
Gross Unrealized Losses	0	(4)
Fair Value	263	874
Long-term Investments [Member] | Certificates of deposit [Member]
Schedule of Available-for-sale Securities [Line Items]
Amortized Cost	245	2,119
Gross Unrealized Gains	0	0
Gross Unrealized Losses	0	0
Fair Value	$ 245	$ 2,119

Balance Sheet Components - In29

Balance Sheet Components - Investments, Contractual Maturities (Details) $ in Thousands	Jun. 30, 2016USD ($)
Organization, Consolidation and Presentation of Financial Statements [Abstract]
Amortized Cost, Due in one year or less	$ 4,497
Amortized Cost, Due in one year to five years	508
Amortized Cost	5,005
Fair Value, Due in one year or less	4,497
Fair Value, Due in one year to five years	508
Fair Value	$ 5,005

Balance Sheet Components - In30

Balance Sheet Components - Inventory (Details) - USD ($) $ in Thousands	Jun. 30, 2016	Dec. 31, 2015
Organization, Consolidation and Presentation of Financial Statements [Abstract]
Raw materials	$ 8,091	$ 9,117
Finished goods	20,012	18,978
Total inventory	$ 28,103	$ 28,095

Balance Sheet Components - Prop

Balance Sheet Components - Property and Equipment, Net (Details) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2016	Jun. 30, 2015	Jun. 30, 2016	Jun. 30, 2015	Dec. 31, 2015
Property, Plant and Equipment [Line Items]
Property, plant and equipment, gross	$ 14,037		$ 14,037		$ 12,604
Less: Accumulated depreciation and amortization	(6,307)		(6,307)		(5,635)
Property and equipment, net	7,730		7,730		6,969
Property and equipment acquired under capital leases	392		392		382
Depreciation and amortization expense	600	$ 400	1,200	$ 700
Lab equipment, tooling and molds [Member]
Property, Plant and Equipment [Line Items]
Property, plant and equipment, gross	3,943		3,943		3,228
Computer software [Member]
Property, Plant and Equipment [Line Items]
Property, plant and equipment, gross	2,503		2,503		2,019
Computer equipment [Member]
Property, Plant and Equipment [Line Items]
Property, plant and equipment, gross	2,543		2,543		2,757
Property and equipment acquired under capital leases	392		392		382
Leasehold improvements [Member]
Property, Plant and Equipment [Line Items]
Property, plant and equipment, gross	1,929		1,929		1,670
Furniture and fixtures [Member]
Property, Plant and Equipment [Line Items]
Property, plant and equipment, gross	1,134		1,134		950
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	$ 1,950		$ 1,950		$ 1,945

Balance Sheet Components - Accr

Balance Sheet Components - Accrued and Other Current Liabilities (Details) - USD ($) $ in Thousands	Jun. 30, 2016	Dec. 31, 2015
Organization, Consolidation and Presentation of Financial Statements [Abstract]
Accrued payroll and employee related expenses	$ 13,408	$ 14,887
Accrued marketing expenses	4,995	5,554
Accrued royalty	6,786	5,453
Sales and other taxes payable	3,853	3,703
Advance payments from customers	1,879	1,585
Accrued warranty	1,428	527
Accrued legal expenses	2,987	1,465
Other	2,293	1,517
Total accrued and other current liabilities	$ 37,629	$ 34,691

Balance Sheet Components Balanc

Balance Sheet Components Balance Sheet Components - Deferred Revenue (Details) - USD ($) $ in Thousands	Jun. 30, 2016	Dec. 31, 2015
Product Information [Line Items]
Deferred extended warranty revenue	$ 3,072	$ 2,902
Deferred training revenue	3,793	3,115
Deferred product revenue	13,316	1,891
Total deferred revenue	20,181	$ 7,908
Applicators [Member]
Product Information [Line Items]
Deferred product revenue	$ 8,200

Balance Sheet Components - Prod

Balance Sheet Components - Product Warranty (Details) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2016	Jun. 30, 2015	Jun. 30, 2016	Jun. 30, 2015
Movement in Extended Product Warranty Accrual [Roll Forward]
Balance at the beginning of the period	$ 2,901	$ 3,215	$ 2,902	$ 3,272
Extended warranties issued	1,215	1,073	2,219	1,806
Amortization	(1,044)	(903)	(2,049)	(1,693)
Balance at the end of the period	3,072	3,385	3,072	3,385
Movement in Standard Product Warranty Accrual [Roll Forward]
Balance at the beginning of the period	1,052	440	527	569
Settlements of warranties	(248)	33	(473)	(67)
Provision	624	(134)	1,374	(163)
Balance at the end of the period	$ 1,428	$ 339	$ 1,428	$ 339
Direct Customer [Member] | Control Units [Member]
Product Liability Contingency [Line Items]
Standard limited warranty (years)			1 year
Direct Customer [Member] | Applicators [Member]
Product Liability Contingency [Line Items]
Standard limited warranty (years)			1 year
International [Member] | Indirect Customer [Member] | Control Units [Member]
Product Liability Contingency [Line Items]
Standard limited warranty (years)			3 years 2 months
International [Member] | Indirect Customer [Member] | Applicators [Member]
Product Liability Contingency [Line Items]
Standard limited warranty (years)			1 year 2 months

Intangible Asset, Net - Compone

Intangible Asset, Net - Components (Details) - USD ($) $ in Thousands	Jun. 30, 2016	Dec. 31, 2015
Goodwill and Intangible Assets Disclosure [Abstract]
Purchased technology	$ 8,050	$ 8,050
Less: Accumulated amortization	(3,283)	(2,958)
Intangible asset, net	$ 4,767	$ 5,092

Intangible Asset, Net - Amortiz

Intangible Asset, Net - Amortization (Details) - USD ($) $ in Millions	3 Months Ended		6 Months Ended
	Jun. 30, 2016	Jun. 30, 2015	Jun. 30, 2016	Jun. 30, 2015
Goodwill and Intangible Assets Disclosure [Abstract]
Amortization expense	$ 0.2	$ 0.2	$ 0.3	$ 0.4

Intangible Asset, Net - Estimat

Intangible Asset, Net - Estimated Annual Future Amortization Expense (Details) - USD ($) $ in Thousands	Jun. 30, 2016	Dec. 31, 2015
Fiscal Year
2016 (remaining 6 months)	$ 325
2,017	650
2,018	650
2,019	650
2,020	650
Thereafter	1,842
Intangible asset, net	$ 4,767	$ 5,092

Related Party Transactions (Det

Related Party Transactions (Details) - Distributor [Member] - USD ($)	3 Months Ended		6 Months Ended
	Jun. 30, 2016	Jun. 30, 2015	Jun. 30, 2016	Jun. 30, 2015	Dec. 31, 2015
Related Party Transaction [Line Items]
Payments term, maximum (days)			180 days
Revenue from related parties	$ 400,000	$ 300,000	$ 1,400,000	$ 1,600,000
Accounts receivable, related parties	$ 0		$ 0		$ 1,700,000

Commitments and Contingencies -

Commitments and Contingencies - Operating Lease Obligations (Details) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2016USD ($)ft²	Jun. 30, 2015USD ($)	Jun. 30, 2016USD ($)ft²	Jun. 30, 2015USD ($)	Dec. 31, 2015USD ($)
Commitments and Contingencies Disclosure [Abstract]
Square foot of property | ft²	109,701		109,701
Rent expense	$ 700	$ 600	$ 1,300	$ 1,100
Operating Leases, Future Minimum Payments Due, Fiscal Year Maturity [Abstract]
2016 (remaining 6 months)	1,340		1,340
2,017	3,845		3,845
2,018	5,317		5,317
2,019	5,188		5,188
2,020	4,943		4,943
Thereafter	31,785		31,785
Total future minimum lease payments	$ 52,418		$ 52,418		$ 7,300

Commitments and Contingencies40

Commitments and Contingencies - Capital Lease Obligations (Details) - USD ($) $ in Thousands	3 Months Ended	6 Months Ended
	Jun. 30, 2016	Jun. 30, 2016	Dec. 31, 2015
Capital Leased Assets [Line Items]
Capital leased equipment, gross	$ 392	$ 392	$ 382
Less: Accumulated depreciation and amortization	(212)	(212)	(149)
Capital leased equipment, net	180	180	233
Amortization of assets acquired under capital leases	32	100
Year Ending December 31,
2016 (remaining 6 months)	66	66
2,017	141	141
Total future payments	207	207
Less: Amount representing interest	6	6
Present value of future minimum payments	201	201
Less: Current portion	127	127	124
Long term portion	74	$ 74	138
Computer equipment [Member]
Capital Leased Assets [Line Items]
Useful life (Years)		3 years
Capital leased equipment, gross	$ 392	$ 392	$ 382

Commitments and Contingencies41

Commitments and Contingencies - Purchase Commitments, Unrecognized Tax Benefits, and Product Liability Contingencies (Details) - USD ($) $ in Millions	Feb. 25, 2016	Jun. 30, 2016	Mar. 31, 2016	Jun. 30, 2016	Dec. 31, 2015
Commitments and Contingencies Disclosure [Abstract]
Purchase obligation		$ 5		$ 5	$ 5.9
Unrecognized tax benefits, including estimated interest and penalties		0.3		0.3
Product liability claims settled		0.6		1.5
Known and reasonably estimable self-insured product liability claims pending		2		2	$ 1.1
Chief Financial Officer [Member]
Loss Contingencies [Line Items]
Termination benefits related costs	$ 0.3
Recognized stock-based compensation		$ 0.4	$ 0.7	$ 1.1

Stock-Based Compensation Expe42

Stock-Based Compensation Expense - Stock Options Plan Activity (Details) - $ / shares	3 Months Ended		6 Months Ended
	Jun. 30, 2016	Jun. 30, 2015	Jun. 30, 2016	Jun. 30, 2015
Shares Available for Grant
Balance at beginning of period (shares)			3,517,305
Additional shares reserved (shares)			1,000,000
Options granted (shares)			(302,236)
Options canceled (shares)			(7,509)
Balance at end of period (shares)	3,703,091		3,703,091
Number of Stock Options Outstanding
Balance at beginning of period (shares)			2,641,592
Options granted (shares)	0	0	(302,236)	(45,622)
Options exercised (shares)			(29,167)
Options canceled (shares)			(7,509)
Balance at end of period (shares)	2,907,152		2,907,152
Weighted- Average Exercise Price
Balance at beginning of period (Weighted average exercise price) (usd per share)			$ 6.47
Options granted (Weighted average exercise price) (usd per share)			22.25
Options exercised (Weighted average exercise price) (usd per share)			6.30
Options canceled (Weighted average exercise price) (usd per share)			4.19
Balance at end of period (Weighted average exercise price) (usd per share)	$ 8.47		$ 8.47
Restricted stock units (RSUs) [Member]
Shares Available for Grant
Restricted stock units granted (shares)			(761,790)
Restricted stock units canceled (shares)			87,621
Restricted stock units withheld for tax (shares)	42,136	41,832	154,682	174,867

Stock-Based Compensation Expe43

Stock-Based Compensation Expense - Restricted Stock Units (Details) - USD ($) $ / shares in Units, $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2016	Jun. 30, 2015	Jun. 30, 2016	Jun. 30, 2015
Weighted- Average Grant Date Fair Value
Payments for employee's tax obligations to relevant taxing authority			$ 3,871	$ 5,599
Restricted stock units (RSUs) [Member]
Number of Units and Awards
Balance at beginning of period (shares)			1,312,651
Restricted stock units granted (shares)			761,790
Restricted stock units vested (shares)	(111,069)	(101,407)	(419,703)	(431,608)
Restricted stock units canceled (shares)			(87,621)
Balance at end of period (shares)	1,567,117		1,567,117
Weighted- Average Grant Date Fair Value
Balance at beginning of period (Weighted average exercise price) (usd per share)			$ 19.09
Restricted stock units granted (Weighted average exercise price) (usd per share)			25.25
Restricted stock units vested (Weighted average exercise price) (usd per share)			14.68
Restricted stock units canceled (Weighted average exercise price) (usd per share)			21.44
Balance at end of period (Weighted average exercise price) (usd per share)	$ 23.14		$ 23.14
Restricted stock units vested (shares)	111,069	101,407	419,703	431,608
Restricted stock units withheld for tax (shares)	42,136	41,832	154,682	174,867
Payments for employee's tax obligations to relevant taxing authority	$ 1,200	$ 1,300	$ 3,900	$ 5,600

Stock-Based Compensation Expe44

Stock-Based Compensation Expense - Allocation of Stock Based Compensation Expense (Details) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2016	Jun. 30, 2015	Jun. 30, 2016	Jun. 30, 2015
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Stock-based compensation expense	$ 4,620	$ 3,083	$ 8,822	$ 7,233
Options granted (shares)	0	0	302,236	45,622
Stock Compensation Plan [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Unrecognized compensation cost	$ 30,800		$ 30,800
Unrecognized compensation cost, recognition period			3 years 8 months 12 days
Performance Based Restricted Stock Units [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Options granted (shares)			40,000	40,000
Performance Based Stock Options and Restricted Stock Units [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Stock-based compensation expense	400	$ 500	$ 800	$ 2,000
Minimum [Member] | Performance Based Restricted Stock Units [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Award vesting (percent)			0.00%
Maximum [Member] | Performance Based Restricted Stock Units [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Award vesting (percent)			100.00%
Revenue [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Stock-based compensation expense		68	$ 56	148
Cost of Revenue [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Stock-based compensation expense	258	149	490	283
Research and Development [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Stock-based compensation expense	507	392	1,008	742
Sales and Marketing [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Stock-based compensation expense	1,820	1,345	3,203	2,896
General and Administrative [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Stock-based compensation expense	1,979	$ 1,129	$ 4,065	$ 3,164
Non-Employee [Member] | Revenue [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Stock-based compensation expense	$ 56

Stock-Based Compensation Expe45

Stock-Based Compensation Expense - Assumptions (Details) - Stock Options [Member]	6 Months Ended
	Jun. 30, 2016	Jun. 30, 2015
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Expected term	4 years 9 months 18 days	4 years 9 months 18 days
Expected volatility	63.00%	63.00%
Risk-free interest rate	1.21%	1.29%
Expected dividend yield	0.00%	0.00%

Stock-Based Compensation Expe46

Stock-Based Compensation Expense - Employee Stock-Based Compensation (Details) - USD ($) $ / shares in Units, $ in Millions	3 Months Ended		6 Months Ended
	Jun. 30, 2016	Jun. 30, 2015	Jun. 30, 2016	Jun. 30, 2015
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Options granted (shares)	0	0	302,236	45,622
Weighted average grant date fair value, options (usd per share)			$ 22.25	$ 18.19
Stock Options [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Expected dividend yield			0.00%	0.00%
Performance Based Restricted Stock Units [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Options granted (shares)			40,000	40,000
Employee Restricted Stock Units (RSUs) [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Restricted stock units granted (shares)	382,221	65,215	761,790	418,972
Weighted average grant date fair value (usd per share)	$ 27.71	$ 29.42	$ 25.25	$ 31.56
ESPP [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Shares purchased under employee stock purchase plan			66,857
Weighted average exercise price of shares purchased under employee stock purchase plan (usd per share)	$ 24.19		$ 24.19
Unrecognized compensation cost	$ 0.5		$ 0.5
Unrecognized compensation cost, recognition period			5 months

Stock-Based Compensation Expe47

Stock-Based Compensation Expense - Non-Employee Stock-Based Compensation (Details) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2016	Jun. 30, 2015	Jun. 30, 2016	Jun. 30, 2015
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Stock-based compensation expense	$ 4,620	$ 3,083	$ 8,822	$ 7,233
Revenue [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Stock-based compensation expense		68	$ 56	148
Non-Employee [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Vesting period for non-employee stock-based awards	1 year		1 year
Stock-based compensation expense related to non-employee grants	$ 100	$ 100	$ 100	$ 300
Non-Employee [Member] | Revenue [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Stock-based compensation expense	$ 56

Net Income (Loss) Per Share - S

Net Income (Loss) Per Share - Schedule of Earnings Per Share, Basic and Diluted (Details) - USD ($) $ / shares in Units, $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2016	Jun. 30, 2015	Jun. 30, 2016	Jun. 30, 2015
Numerator
Net income (loss)	$ (4,902)	$ 1,178	$ (14,772)	$ (951)
Denominator
Weighted average shares of common stock outstanding used in computing net income (loss) per share, basic (shares)	39,493,665	38,649,873	39,391,259	38,517,817
Dilutive effect of incremental shares and share equivalents (shares)	0	2,991,787	0	0
Weighted average shares of common stock outstanding used in computing net income (loss) per share, diluted (shares)	39,493,665	41,641,660	39,391,259	38,517,817
Net income (loss) per share:
Net income (loss) per share, basic (usd per share)	$ (0.12)	$ 0.03	$ (0.38)	$ (0.02)
Net income (loss) per share, diluted (usd per share)	$ (0.12)	$ 0.03	$ (0.38)	$ (0.02)

Net Income (Loss) Per Share - O

Net Income (Loss) Per Share - Outstanding Shares of Potentially Dilutive Securities (Details) - shares	3 Months Ended		6 Months Ended
	Jun. 30, 2016	Jun. 30, 2015	Jun. 30, 2016	Jun. 30, 2015
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items]
Antidilutive securities excluded from computation of earnings per share, amount (shares)	446,434	161,657	4,474,269	4,379,362
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 (shares)	347,848	45,622	2,907,152	2,958,922
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 (shares)	98,586	116,035	1,567,117	1,419,718
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 (shares)	0	0	0	722

Income Taxes (Details)

Income Taxes (Details) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2016	Jun. 30, 2015	Jun. 30, 2016	Jun. 30, 2015
Income Tax Disclosure [Abstract]
Income tax expense	$ 2,765	$ 43	$ 2,081	$ 71
Unrecognized tax benefits	$ 3,100		$ 3,100

Segment Information (Details)

Segment Information (Details) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2016USD ($)	Jun. 30, 2015USD ($)	Jun. 30, 2016USD ($)managerbusiness_activitysegment	Jun. 30, 2015USD ($)	Dec. 31, 2015USD ($)
Segment Reporting [Abstract]
Number of business activities | business_activity			1
Number of segment managers held accountable for operations | manager			0
Number of reportable segments | segment			1
Segment Reporting Information [Line Items]
Revenue, net	$ 89,465	$ 64,431	$ 153,934	$ 115,989
Property and equipment, net	7,730		7,730		$ 6,969
Systems Revenue [Member]
Segment Reporting Information [Line Items]
Revenue, net	39,449	32,047	64,138	58,203
Consumable Revenue [Member]
Segment Reporting Information [Line Items]
Revenue, net	50,016	32,384	89,796	57,786
North America [Member]
Segment Reporting Information [Line Items]
Revenue, net	74,014	51,436	125,483	86,665
U.S. [Member]
Segment Reporting Information [Line Items]
Revenue, net	71,600	46,400	122,900	79,500
Property and equipment, net	5,873		5,873		6,691
International [Member]
Segment Reporting Information [Line Items]
Revenue, net	15,451	$ 12,995	28,451	$ 29,324
Ireland [Member]
Segment Reporting Information [Line Items]
Property and equipment, net	1,589		1,589		0
Other [Member]
Segment Reporting Information [Line Items]
Property and equipment, net	$ 268		$ 268		$ 278