ZELTIQ Aesthetics (ZLTQ) 10-Q 5 May 15 2015 Q1 Quarterly report Financial data

Document_And_Entity_Informatio

Document And Entity Information	3 Months Ended
	Mar. 31, 2015	Apr. 30, 2015
Document and Entity Information [Abstract]
Document Type	10-Q
Amendment Flag	FALSE
Document Period End Date	31-Mar-15
Document Fiscal Year Focus	2015
Document Fiscal Period Focus	Q1
Entity Registrant Name	Zeltiq Aesthetics Inc
Entity Central Index Key	1415336
Current Fiscal Year End Date	-19
Entity Filer Category	Accelerated Filer
Entity Common Stock, Shares Outstanding		38,606,704

Condensed_Consolidated_Balance

Condensed Consolidated Balance Sheets (USD $)	Mar. 31, 2015	Dec. 31, 2014
In Thousands, unless otherwise specified
CURRENT ASSETS:
Cash and cash equivalents	$25,057	$28,649
Short-term investments	15,822	16,286
Accounts receivable, net	24,525	21,472
Inventory	17,353	15,536
Prepaid expenses and other current assets	7,384	7,060
Total current assets	90,141	89,003
Long-term investments	3,411	4,805
Restricted cash	546	560
Property and equipment, net	3,608	3,724
Intangible asset, net	5,605	5,780
Other assets	68	33
Total assets	103,379	103,905
CURRENT LIABILITIES:
Accounts payable	7,297	5,824
Accrued liabilities	20,224	21,450
Deferred revenue	5,674	5,069
Current portion of capital lease obligations	121	120
Total current liabilities	33,316	32,463
Long-term deferred revenue	472	622
Long-term capital lease obligations, less current portion	232	262
Other non-current liabilities	385	39
Total liabilities	34,405	33,386
Commitments and contingencies
STOCKHOLDERS’ EQUITY:
Preferred stock, $0.01 par value: 50,000,000 shares authorized and no shares issued and outstanding at March 31, 2015, and December 31, 2014	0	0
Common stock, $0.001 par value: 500,000,000 shares authorized at March 31, 2015, and December 31, 2014; 38,569,936 and 38,123,998 shares issued and outstanding at March 31, 2015, and December 31, 2014, respectively	42	42
Additional paid-in capital	203,868	202,701
Accumulated other comprehensive income (loss)	-1,279	-696
Accumulated deficit	-133,657	-131,528
Total stockholders’ equity	68,974	70,519
Total liabilities and stockholders’ equity	$103,379	$103,905

Condensed_Consolidated_Balance1

Condensed Consolidated Balance Sheets (Parenthetical) (USD $)	Mar. 31, 2015	Dec. 31, 2014
Statement of Financial Position [Abstract]
Preferred stock, par value (in dollars per share)	$0.01	$0.01
Preferred stock, shares authorized	50,000,000	50,000,000
Preferred stock, shares issued	0	0
Preferred stock, shares outstanding	0	0
Common stock, par value (in dollars per share)	$0.00	$0.00
Common stock, shares authorized	500,000,000	500,000,000
Common stock, shares issued	38,569,936	38,123,998
Common stock, shares outstanding	38,569,936	38,123,998

Condensed_Consolidated_Stateme

Condensed Consolidated Statements of Operations (USD $)	3 Months Ended
In Thousands, except Share data, unless otherwise specified	Mar. 31, 2015	Mar. 31, 2014
Income Statement [Abstract]
Revenue	$51,558	$30,975
Cost of revenue	14,378	9,016
Gross profit	37,180	21,959
Operating expenses:
Research and development	6,080	4,270
Sales and marketing	24,406	20,187
General and administrative	8,388	4,713
Total operating expenses	38,874	29,170
Income (loss) from operations	-1,694	-7,211
Interest income (expense), net	13	19
Other income (expense), net	-420	-66
Income (loss) before income taxes	-2,101	-7,258
Income tax expense	28	79
Net income (loss)	($2,129)	($7,337)
Basic net income (loss) per share:
Net income (loss) per share, basic (dollars per share)	($0.06)	($0.20)
Weighted average shares of common stock outstanding used in computing net income (loss) per share, basic (shares)	38,383,022	37,215,697
Diluted net income (loss) per share:
Net income (loss) per share, diluted (dollars per share)	($0.06)	($0.20)
Weighted average shares of common stock outstanding used in computing net income (loss) per share, diluted (shares)	38,383,022	37,215,697

Condensed_Consolidated_Stateme1

Condensed Consolidated Statements of Comprehensive Income (Loss) (USD $)	3 Months Ended
In Thousands, unless otherwise specified	Mar. 31, 2015	Mar. 31, 2014
Statement of Comprehensive Income [Abstract]
Net income (loss)	($2,129)	($7,337)
Other comprehensive income (loss), net of tax:
Foreign currency translation adjustments	-588	30
Changes in unrealized gains (losses) on available-for-sale securities	5	2
Other comprehensive income (loss), net of tax	-583	32
Comprehensive income (loss)	($2,712)	($7,305)

Condensed_Consolidated_Stateme2

Condensed Consolidated Statements of Cash Flows (USD $)	3 Months Ended
In Thousands, unless otherwise specified	Mar. 31, 2015	Mar. 31, 2014
CASH FLOWS FROM OPERATING ACTIVITIES:
Net income (loss)	($2,129)	($7,337)
Adjustments to reconcile net income (loss) to net cash used in operating activities:
Depreciation and amortization	513	455
Stock-based compensation	4,150	2,105
Deferred income taxes	0	30
Amortization (accretion) of investment premium (discount), net	22	67
Provision for (recovery of) doubtful accounts receivable	123	0
Provision for excess and obsolete inventory	128	105
Loss on disposal and write-off of property and equipment	0	17
Changes in operating assets and liabilities:
Accounts receivable	-3,359	-2,088
Inventory	-2,100	-6,291
Prepaid expenses and other assets	-391	570
Deferred revenue, net of deferred costs	503	853
Accounts payable, accrued and other non-current liabilities	710	-829
Net cash provided by (used in) operating activities	-1,830	-12,343
CASH FLOWS FROM INVESTING ACTIVITIES:
Purchase of investments	-4,070	-2,249
Proceeds from sale of investments	0	1,000
Proceeds from maturity of investments	5,911	4,791
Purchase of property and equipment	-285	-559
Change in restricted cash	0	-1
Net cash provided by (used in) investing activities	1,556	2,982
CASH FLOWS FROM FINANCING ACTIVITIES:
Principal payments on capital leases	-29	0
Proceeds from issuance of common stock upon exercise of stock options	1,346	640
Tax payments related to shares withheld for vested restricted stock units	-4,345	-2,546
Tax effect of employee stock plans	16	0
Net cash provided by (used in) financing activities	-3,012	-1,906
Effect of exchange rate changes on cash and cash equivalents	-306	15
NET INCREASE (DECREASE) IN CASH AND CASH EQUIVALENTS	-3,592	-11,252
CASH AND CASH EQUIVALENTS—Beginning of period	28,649	25,798
CASH AND CASH EQUIVALENTS—End of period	$25,057	$14,546

Basis_of_Presentation_and_Summ

Basis of Presentation and Summary of Significant Accounting Policies	3 Months Ended
	Mar. 31, 2015
Organization, Consolidation and Presentation of Financial Statements [Abstract]
Basis of Presentation and Summary of Significant Accounting Policies	Basis of Presentation and Summary of Significant Accounting Policies
	Basis of Presentation
	The accompanying interim condensed consolidated financial statements of ZELTIQ Aesthetics, Inc. (the "Company") are unaudited. These interim condensed consolidated financial statements have been prepared in accordance with generally accepted accounting principles in the United States of America, or GAAP, and the applicable rules and regulations of the Securities and Exchange Commission, or SEC, for interim financial information. Accordingly, they do not include all of the information and footnotes required by GAAP for complete financial statements. The December 31, 2014, condensed consolidated balance sheet was derived from the audited financial statements as of that date, but does not include all of the information and footnotes required by GAAP for complete financial statements.
	The accompanying unaudited interim condensed consolidated financial statements have been prepared on the same basis as the audited consolidated financial statements and, in the opinion of management, reflect all adjustments of a normal recurring nature considered necessary to state fairly the Company's financial position as of March 31, 2015, results of operations for the three months ended March 31, 2015 and 2014, comprehensive income (loss) for the three months ended March 31, 2015 and 2014, and cash flows for the three months ended March 31, 2015 and 2014. The interim results for the three months ended March 31, 2015, are not necessarily indicative of the results that may be expected for the year ending December 31, 2015, or for any other future annual or interim period. Certain amounts in the prior year's condensed consolidated statement of balance sheets have been reclassified to conform to the current period's presentation. These reclassifications had no impact on previously reported consolidated balance sheets or results of consolidated statements of operations.
	The information included in this Quarterly Report on Form 10-Q should be read in conjunction with “Management’s Discussion and Analysis of Financial Condition and Results of Operations," “Quantitative and Qualitative Disclosures About Market Risk” and the Consolidated Financial Statements and notes thereto included in Items 7, 7A and 8, respectively, in the Company's Annual Report on Form 10-K for the year ended December 31, 2014.
	Principles of Consolidation
	The condensed consolidated financial statements include the accounts of the Company and its wholly-owned subsidiaries. All significant intercompany accounts and transactions have been eliminated.
	The functional currency of the Company’s international subsidiaries is evaluated on a case-by-case basis and has been determined to be the local currency. All assets and liabilities of these foreign operations are translated to U.S. Dollars at current period end exchange rates, and revenue and expenses are translated to U.S. Dollars using average exchange rates in effect during the period. The gains and losses from the foreign currency translation of the foreign subsidiaries' financial statements are included as a separate component of stockholders' equity under "Accumulated other comprehensive income (loss)." Gains or losses arising from currency exchange rate fluctuations on transactions denominated in a currency other than the local functional currency are included in other income (expense), net.
	Use of Estimates
	The preparation of financial statements in conformity with GAAP requires management to make certain estimates and assumptions that affect the reported amounts of assets and liabilities and disclosure of contingent assets and liabilities at the date of the financial statements and the reported amounts of revenue and expenses during the reported periods. The primary estimates underlying the Company's financial statements include the value of revenue elements, product warranty, inventory valuation, allowance for doubtful accounts receivable, assumptions regarding variables used in calculating the fair value of the Company's equity awards, fair value of investments, useful lives of intangibles, income taxes and contingent liabilities. Actual results could differ from those estimates.
	Concentration of Credit Risk
	As of March 31, 2015, one individual customer, which is a large aesthetic chain, accounted for 25% of accounts receivable. As of March 31, 2014, no individual customer accounted for 10% or more of the Company's accounts receivable. During the three months ended March 31, 2015, one individual customer, which is a large aesthetic chain, accounted for 11% of total revenue. During the three months ended March 31, 2014, no individual customer accounted for 10% or more of total revenue.
	Critical Accounting Policies
	There have been no material changes to the Company’s critical accounting policies during the three months ended March 31, 2015, as compared to the critical accounting policies described in the Company’s Annual Report on Form 10-K for the year ended December 31, 2014.
	Recent Accounting Pronouncements
	On May 28, 2014, the Financial Accounting Standards Board, or FASB, issued Accounting Standards Update No. 2014-10, Revenue from Contracts with Customers. The objective of this update is to provide a single, comprehensive revenue recognition model for all contracts with customers to improve comparability within industries, across industries, and across capital markets. This standard update contains principles that the Company will apply to determine the measurement of revenue and timing of when it is recognized. This guidance allows for two methods of adoption: (a) full retrospective adoption, meaning the guidance is applied to all periods presented, or (b) modified retrospective adoption, meaning the cumulative effect of applying this guidance is recognized as an adjustment to the fiscal 2017 opening Accumulated deficit balance. The Company will adopt this guidance effective January 1, 2017, and is currently evaluating the two adoption methods as well as the impact this new guidance will have on the consolidated financial statements and related disclosures.
	In August 2014, the FASB issued Accounting Standards Update No. 2014-15, Disclosure of Uncertainties About an Entity's Ability to Continue as a Going Concern. This standard update provides guidance around management's responsibility to evaluate whether there is substantial doubt about an entity's ability to continue as a going concern and to provide related footnote disclosures. The new guidance is effective for all annual and interim periods ending after December 15, 2016. The new guidance will not have an impact on the Company's consolidated financial statements.

Fair_Value_of_Financial_Instru

Fair Value of Financial Instruments	3 Months Ended
	Mar. 31, 2015
Fair Value Disclosures [Abstract]
Fair Value of Financial Instruments	Fair Value of Financial Instruments
	Fair value is defined as the price that would be received to sell an asset or paid to transfer a liability (an exit price) in an orderly transaction between market participants at the reporting date. The accounting guidance establishes a three-tiered hierarchy, which prioritizes the inputs used in the valuation methodologies in measuring fair value:
	•Level 1—Quoted prices in active markets for identical assets or liabilities.
	•Level 2—Inputs other than Level 1 that are observable, either directly or indirectly, such as quoted prices in markets that are not active, or other inputs that are observable or can be corroborated by observable market data for substantially the full term of the assets or liabilities.
	•Level 3—Unobservable inputs that are supported by little or no market activity and that are significant to the fair value of the assets or liabilities. The Company did not hold any Level 3 assets or liabilities at March 31, 2015.
	The categorization of a financial instrument within the valuation hierarchy is based on the lowest level of input that is significant to the fair value measurement.
	The Company classifies its cash equivalents and investments within Level 1 and Level 2, as it uses quoted market prices or alternative pricing sources and models utilizing market observable inputs. The following tables set forth the fair value of the Company’s financial assets and liabilities by level within the fair value hierarchy (in thousands):
		As of March 31, 2015
		Level 1		Level 2		Level 3		Fair Value
	Financial Assets
	Cash equivalents:
	Money market funds	$	4,962	$	—	$	—	$	4,962
	Short-term investments:
	U.S. Agency securities	—		5,253		—		5,253
	U.S. Treasury	—		1,002		—		1,002
	Corporate bonds	—		7,734		—		7,734
	Commercial paper	—		600		—		600
	Certificates of deposit	1,233		—		—		1,233
	Long-term investments:
	U.S. Agency securities	—		850		—		850
	Corporate bonds	—		250		—		250
	Certificates of deposit	2,311		—		—		2,311
	Total	$	8,506	$	15,689	$	—	$	24,195
		As of December 31, 2014
		Level 1		Level 2		Level 3		Fair Value
	Financial Assets
	Cash equivalents:
	Money market funds	$	6,062	$	—	$	—	$	6,062
	Short-term investments:
	U.S. Agency securities	—		5,240		—		5,240
	U.S. Treasury	—		1,004		—		1,004
	Corporate bonds	—		7,774		—		7,774
	Commercial paper	—		1,349		—		1,349
	Certificates of deposit	919		—		—		919
	Long-term investments:
	U.S. Agency securities	—		999		—		999
	U.S. Treasury	—		500		—		500
	Corporate bonds	—		750		—		750
	Certificates of deposit	2,556		—		—		2,556
	Total	$	9,537	$	17,616	$	—	$	27,153
	During the three months ended March 31, 2015 and 2014, the Company did not have any transfers of financial assets measured at fair value on a recurring basis to or from Level 1, Level 2 or Level 3. The Company did not hold any Level 3 assets or liabilities as of March 31, 2015, and December 31, 2014.
	The carrying amounts of the Company’s cash equivalents, accounts receivable, accounts payable and accrued liabilities, approximate fair value due to their relatively short maturities.

Balance_Sheet_Components

Balance Sheet Components	3 Months Ended
	Mar. 31, 2015
Organization, Consolidation and Presentation of Financial Statements [Abstract]
Balance Sheet Components	Balance Sheet Components
	Investments
	The Company's short-term and long-term investments as of March 31, 2015, are as follows (in thousands):
	Short-term
		Amortized Cost			Gross Unrealized Gains			Gross Unrealized Losses			Fair Value
	U.S. Agency securities	$	5,252		$	1		$	—		$	5,253
	U.S. Treasury	1,001			1			—			1,002
	Corporate bonds	7,737			2			(5		)	7,734
	Commercial paper	600			—			—			600
	Certificates of deposit	1,233			—			—			1,233
	Total	$	15,823		$	4		$	(5	)	$	15,822
	Long-term
		Amortized Cost			Gross Unrealized Gains			Gross Unrealized Losses			Fair Value
	U.S. Agency securities	$	850		$	—		$	—		$	850
	Corporate bonds	250			—			—			250
	Certificates of deposit	2,311			—			—			2,311
	Total	$	3,411		$	—		$	—		$	3,411
	The Company's short-term and long-term investments as of December 31, 2014, are as follows (in thousands):
	Short-term
		Amortized Cost			Gross Unrealized Gains			Gross Unrealized Losses			Fair Value
	U.S. Agency securities	$	5,240		$	1		$	(1	)	$	5,240
	U.S. Treasury	1,003			1			—			1,004
	Corporate bonds	7,778			2			(6		)	7,774
	Commercial paper	1,349			—			—			1,349
	Certificates of deposit	919			—			—			919
	Total	$	16,289		$	4		$	(7	)	$	16,286
	Long-term
		Amortized Cost			Gross Unrealized Gains			Gross Unrealized Losses			Fair Value
	U.S. Agency securities	$	1,000		$	—		$	(1	)	$	999
	U.S. Treasury	500			—			—			500
	Corporate bonds	752			—			(2		)	750
	Certificates of deposit	2,556			—			—			2,556
	Total	$	4,808		$	—		$	(3	)	$	4,805
	For each of the three months ended March 31, 2015 and 2014, gains or losses realized on the sale of investments were insignificant.
	The contractual maturities of the Company's short-term and long-term investments as of March 31, 2015, are as follows (in thousands):
		March 31, 2015
		Amortized Cost			Fair Value
	Due in one year or less	$	15,823		$	15,822
	Due in one year to five years	3,411			3,411
		$	19,234		$	19,233
	When evaluating the investments for other-than-temporary impairment, the Company reviews factors such as the length of time and extent to which fair value has been below the amortized cost basis, review of current market liquidity, interest rate risk, the financial condition of the issuer, as well as credit rating downgrades. The Company believes that the unrealized losses are not other-than-temporary. The Company does not have a foreseeable need to liquidate the portfolio and anticipates recovering the full cost of the securities either as market conditions improve, or as the securities mature.
	Inventory
	Inventory is stated at the lower of cost (which approximates actual cost on a first-in, first-out basis) or market, computed on a standard cost basis. Inventory that is obsolete or in excess of forecasted usage is written down to its estimated net realizable value based on assumptions about future demand and market conditions.
	The components of inventory consist of the following (in thousands):
		March 31,			December 31,
		2015			2014
	Raw materials	$	7,906		$	7,692
	Finished goods	9,447			7,844
	Total inventory	$	17,353		$	15,536
	Property and equipment, net
	Property and equipment, net comprised the following (in thousands):
		March 31,			December 31,
		2015			2014
	Lab equipment, tooling and molds	$	2,707		$	2,766
	Computer software	1,813			1,337
	Computer equipment	1,106			984
	Leasehold improvements	1,443			1,452
	Furniture and fixtures	569			494
	Vehicles	35			35
	Total property and equipment	7,673			7,068
	Less: Accumulated depreciation and amortization	(4,407		)	(4,111		)
	Construction in progress	342			767
	Property and equipment, net	$	3,608		$	3,724
	The table above includes property and equipment acquired under capital leases which totaled $0.4 million as of both March 31, 2015, and December 31, 2014.
Depreciation and amortization expense related to property and equipment was $0.3 million for the three months ended March 31, 2015. Depreciation and amortization expense related to property and equipment was $0.3 million for the three months ended March 31, 2014.
Accrued Liabilities
The following table shows the components of accrued liabilities (in thousands):
	March 31,			December 31,
	2015			2014
Accrued payroll and employee related expenses	$	6,592		$	8,386
Accrued marketing expenses	2,870			2,959
Accrued royalty	3,494			3,612
Sales and other taxes payable	1,971			2,123
Advance payments from customers	1,244			1,908
Accrued warranty	440			569
Accrued legal expenses	1,917			592
Other accrued liabilities	1,696			1,301
Total accrued liabilities	$	20,224		$	21,450
Product Warranty
The Company provides a standard limited warranty on its products of generally one year for both control units and applicators for its direct customers. For indirect customers in international markets, the Company provides a standard limited warranty on its products of generally three years for control units and one year for applicators.
The Company accrues for the estimated future costs of repair or replacement upon shipment. The warranty accrual is recorded to cost of revenue and is based upon historical and forecasted trends in the volume of product failures during the warranty period and the cost to repair or replace the equipment. The Company bases product warranty costs on related freight, material, technical support labor and overhead costs. The estimated product warranty costs are assessed by considering historical costs and applying the experienced failure rates to the outstanding warranty period for products sold. The Company exercises judgment in estimating the expected product warranty costs, using data such as the actual and projected product failure rates, and average repair costs, including freight, material, technical support labor, and overhead costs, for products returned under warranty.
The estimated product warranty accrual was as follows (in thousands):
	Three Months Ended
	March 31,
	2015			2014
Balance at the beginning of the period	$	569		$	676
Change in accruals for warranties issued	(29		)	39
Settlements of warranty claims	(100		)	(55		)
Balance at the end of the period	$	440		$	660

Intangible_Asset_Net

Intangible Asset, Net	3 Months Ended
	Mar. 31, 2015
Goodwill and Intangible Assets Disclosure [Abstract]
Intangible Asset, Net	Intangible Asset, Net
	The intangible asset consists of an exclusive license agreement with Massachusetts General Hospital, or MGH, for commercializing patents and other technology. All milestone payments payable by the Company pursuant to the terms of the agreement subsequent to the date of the Food and Drug Administration, or FDA, clearance were capitalized as purchased technology when paid, and are subsequently amortized into cost of revenue using the straight-line method over the estimated remaining useful life of the technology, not to exceed the term of the agreement or the life of the patent.
	Intangible asset, net comprised the following (in thousands):
		March 31,			December 31,
		2015			2014
	Purchased technology	$	8,050		$	8,050
	Less: Accumulated amortization	(2,445		)	(2,270		)
	Intangible asset, net	$	5,605		$	5,780
	Amortization expense of the intangible asset was $0.2 million for both the three months ended March 31, 2015 and 2014.
	The total estimated annual future amortization expense of this intangible asset as of March 31, 2015, is as follows (in thousands):
	Fiscal Year
	2015 (remaining 9 months)	$	526
	2016	701
	2017	701
	2018	701
	2019	701
	Thereafter	2,275
	Total	$	5,605

Related_Party_Transactions

Related Party Transactions	3 Months Ended
	Mar. 31, 2015
Related Party Transactions [Abstract]
Related Party Transactions	Related Party Transactions
	Brazilian Distribution Agreement
	The Company entered into a distribution agreement with ADVANCE Medical, Inc. and its wholly-owned subsidiaries, or ADVANCE, dated March 18, 2011, as our exclusive distributor of CoolSculpting in Brazil and Mexico, as amended on August 29, 2011, February 27, 2012, and September 4, 2012. The distribution agreement was further amended on August 15, 2014, whereby ADVANCE is no longer a distributor in Mexico effective November 2014. As the exclusive distributor in Brazil, ADVANCE is required to purchase a minimum quantity of the Company’s products each calendar quarter throughout the term of the distribution agreement which expires on December 31, 2018. Venrock, a principal stockholder of the Company, owns an equity interest in ADVANCE Medical, Ltd., the parent company of ADVANCE. Dr. Bryan E. Roberts, who is a member of the Company's Board of Directors, is also a partner of Venrock Associates. The revenue recognized by the Company under this distribution agreement was $1.3 million for the three months ended March 31, 2015, compared to $1.0 million for the three months ended March 31, 2014. The accounts receivable balance under this distribution agreement was $1.4 million and $0.2 million as of March 31, 2015, and December 31, 2014, respectively.

Commitments_And_Contingencies

Commitments And Contingencies	3 Months Ended
	Mar. 31, 2015
Commitments and Contingencies Disclosure [Abstract]
Commitments and Contingencies	Commitments and Contingencies
	Operating Lease Obligations
	The Company leases facilities under non-cancellable operating leases with various expiration dates. Specifically, the Company occupies a facility in Pleasanton, California, under a lease which extends through March 2019, a manufacturing facility in Dublin, California, under a lease which extends through May 2017, and a warehouse space in Livermore, California, under a lease which extends through May 2017. The Company also occupies office and warehouse space near Gatwick, United Kingdom, under a lease which extends through December 2018, as well as office space in London, United Kingdom, under a lease which extends through October 2015, Taipei, Taiwan, under a lease which extends through August 2016, Seoul, South Korea, under a lease which extends through October 2015, Reston, Virginia, under a lease which extends through September 2020, and Dublin, Ireland under a month-to-month lease. Rent expense for non-cancellable operating leases with scheduled rent increases is recognized on a straight-line basis over the lease term. Rent expense was $0.5 million for the three months ended March 31, 2015, compared to $0.4 million for the three months ended March 31, 2014.
	Future minimum lease payments under the non-cancellable operating leases as of March 31, 2015, are as follows (in thousands):
	Year Ending December 31,	Amount
	2015 (remaining 9 months)	$	1,504
	2016	1,761
	2017	1,798
	2018	1,845
	2019	694
	Thereafter	228
	Total future minimum lease payments	$	7,830
	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 (in thousands):
		Useful life (Years)		31-Mar-15			December 31,
							2014
	Computer equipment	3		382			382
	Total capital leased equipment			382			382
	Less: Accumulated depreciation and amortization			(53		)	(21		)
	Capital leased equipment, net			$	329		$	361
	Total amortization of assets acquired under capital leases was $32,000 for the three months ended March 31, 2015, which is included in total depreciation and amortization expense. There were no such arrangements during the three months ended March 31, 2014.
	Future minimum payments required under capital leases as of March 31, 2015, are as follows (in thousands):
	Year Ending December 31,	Amount
	2015 (remaining 9 months)	$	100
	2016	132
	2017	141
	Total future payments	$	373
	Less: Amount representing interest	$	20
	Present value of future minimum payments	353
	Less: Current portion	121
	Long term portion	$	232
	Purchase Commitments
	The Company had non-cancellable purchase obligations to contract manufacturers and suppliers for $5.8 million and $4.0 million at March 31, 2015, and December 31, 2014, respectively.
	Unrecognized Tax Benefits
	The Company's gross liability for unrecognized tax benefits totaled $26,000, including estimated interest and penalties, as of March 31, 2015, and is classified in long-term income taxes payable. The Company is unable to make a reasonably reliable estimate of the timing of payments in individual years due to uncertainties in the timing of tax audits, if any, or their outcomes.
	Legal Matters
	From time to time, the Company may be involved in legal and administrative proceedings and claims of various types. Additionally, the Company may be subject to insurance related claims resulting from matters associated with CoolSculpting treatments. The Company records a liability in its consolidated financial statements for these matters when a loss is known and considered probable and the amount can be reasonably estimated. Management reviews these estimates in each accounting period as additional information becomes known and adjusts the loss provision when appropriate. If the loss is not probable or cannot be reasonably estimated, a liability is not recorded in the consolidated financial statements. If a loss is probable but the amount of loss cannot be reasonably estimated, the Company discloses the loss contingency and an estimate of possible loss or range of loss (unless such an estimate cannot be made). The Company does not recognize gain contingencies until they are realized. Legal costs incurred in connection with loss contingencies are expensed as incurred.
	The Company is not currently a defendant in any litigation or claims that are expected to have a material impact on the Company's condensed consolidated financial statements.
	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.

StockBased_Compensation_Expens

Stock-Based Compensation Expense	3 Months Ended
	Mar. 31, 2015
Disclosure of Compensation Related Costs, Share-based Payments [Abstract]
Stock-Based Compensation Expense	Stock-Based Compensation Expense
	Stock-Based Compensation Activity
	Activity under the Company’s stock-based compensation plans is set forth below:
						Options Outstanding
			Shares			Number of		Weighted-
			Available			Stock Options		Average
			for Grant			Outstanding		Exercise
								Price
	Balance, December 31, 2014		2,685,209			3,242,421		$	6.47
	Additional shares reserved		1,000,000			—		—
	Options granted		(45,622	)		45,622		34.65
	Restricted stock units granted		(353,757	)		—		—
	Options exercised		—			(252,855	)	5.32
	Options canceled		10,093			(10,093	)	5.1
	Restricted stock units canceled		58,392			—		—
	Restricted stock units withheld for tax		133,035			—		—
	Balance, March 31, 2015		3,487,350			3,025,095		$	6.99
	Restricted Stock Activity
	Activity related to restricted stock units and awards is set forth below:
			Number of Units and Awards			Weighted-
						Average
						Grant Date Fair Value
	Balance, December 31, 2014		1,533,081			$	10.08
	Restricted stock units granted		353,757			31.95
	Restricted stock units vested		(330,201	)		8.77
	Restricted stock units canceled		(58,392	)		8.74
	Balance, March 31, 2015		1,498,245			$	15.58
	During the three months ended March 31, 2015, 330,201 shares vested subject to previously granted restricted stock units. A majority of these vested restricted stock units were net share settled. During the three months ended March 31, 2015, the Company withheld 133,035 shares based upon the Company's closing stock price on the vesting date to settle the employee's minimum statutory obligation for the applicable income and other employment taxes. During the three months ended March 31, 2014, 319,582 shares vested subject to previously granted restricted stock units. A majority of these vested restricted stock units were net share settled. During the three months ended March 31, 2014, the Company withheld 134,836 shares based upon the Company's closing stock price on the vesting date to settle the employee's minimum statutory obligation for the applicable income and other employment taxes.
	Subsequently, the Company remitted cash to the appropriate taxing authorities. Total payments for employee's tax obligations to the relevant taxing authority was $4.3 million for the three months ended March 31, 2015. Total payments for employee's tax obligations to the relevant taxing authority was $2.5 million for the three months ended March 31, 2014. 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
		March 31,
		2015				2014
	Revenue	$	80			$	—
	Cost of revenue	134				93
	Research and development	350				206
	Sales and marketing	1,551				936
	General and administrative	2,035				870
	Total stock-based compensation	$	4,150			$	2,105
	As of March 31, 2015, the total unrecognized compensation costs related to outstanding stock options, awards and employee stock purchases was $21.2 million, which is expected to be recognized using the straight-line attribution method over 1.8 years.
	Performance-Based Awards
	Stock-based compensation expense includes charges related to performance-based stock options and restricted stock units granted to certain executives. Stock-based compensation expense related to these stock options and restricted stock units was $1.5 million for the three months ended March 31, 2015, compared to $0.5 million for the three months ended March 31, 2014.
	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
		March 31,
		2015			2014
	Expected term (in years)	4.8			4.4
	Expected volatility	63	%		43	%
	Risk-free interest rate	1.29	%		1.11	%
	Expected dividend yield	—	%		—	%
	Expected Term. Prior to the Company's initial public offering of its common stock, or IPO, the Company derived the expected term using the “simplified” method (the expected term is determined as the average of the time-to-vesting and the contractual life of the options), as the Company had limited historical information to develop expectations about future exercise patterns and post-vesting employment termination behavior. Subsequent to the IPO and through 2014, the expected term used was based on expected term of a group of similar entities, referred to as its “peer group.” In evaluating similarity, the Company considered factors such as industry, stage of life cycle and size. In 2015, the Company modified its approach by including its own historical data along with the expected term of the identified peer group companies. The Company will continue to apply this methodology until a sufficient amount of historical information regarding its own expected term becomes available.
	Volatility. Prior to the IPO, because the Company was a private entity with no historical data regarding the volatility of its common stock, the expected volatility used was based on volatility of a group of similar entities, referred to as its “peer group.” In evaluating similarity, the Company considered factors such as industry, stage of life cycle and size. Subsequent to the IPO and through 2014, the Company continued to estimate its volatility based on its peer group as the Company did not have sufficient historical data regarding its specific volatility. In 2015, the Company modified its approach by including its own common stock trading history along with the volatility of the identified peer group companies. The expected stock price volatility is estimated using a combination of historical and peer group volatility to derive the expected volatility assumption. The Company believes the blended volatility is more representative of future stock price trends over the expected life of the options rather than just using historical or peer group volatility. The Company will continue to apply this methodology until a sufficient amount of historical information regarding the volatility of its own stock price becomes available.
	Risk-Free Interest Rate. The risk-free interest rate is based on U.S. Treasury zero-coupon issues with remaining terms similar to the expected term on the options.
	Dividend Yield. The Company has never paid any dividends and does not plan to pay dividends in the foreseeable future, and, therefore, used an expected dividend yield of zero in the valuation model.
	Forfeitures. The Company is required to estimate forfeitures at the time of grant, and revise those estimates in subsequent periods if actual forfeitures differ from those estimates. The Company uses historical data to estimate pre-vesting option forfeitures and to record stock-based compensation expense only for those awards that are expected to vest. To the extent actual forfeitures differ from the estimates, the difference will be recorded as a cumulative adjustment in the period that the estimates are revised.
	During the three months ended March 31, 2015, the Company granted 45,622 stock options to employees with a weighted-average grant date fair value of $18.19 per share. During the three months ended March 31, 2014, the Company granted 70,000 stock options to employees with a weighted-average grant date fair value of $7.69 per share.
	During the three months ended March 31, 2015, the Company granted 353,757 restricted stock units to employees with a weighted-average grant date fair value of $31.95 per share. During the three months ended March 31, 2014, the Company granted 183,800 restricted stock units to employees with a weighted-average grant date fair value of $20.80 per share.
	As of March 31, 2015, the unrecognized compensation cost related to the Company's employee stock purchase plan, or ESPP, was $0.2 million, which will be recognized using the straight-line attribution method over 0.2 years.
	Stock-Based Compensation for Non-employees
	Stock-based compensation expense related to stock-based awards to non-employees is recognized as the stock-based awards are earned, generally through the provision of services. The Company believes that the fair value of the stock-based awards is more reliably measurable than the fair value of the services received. The fair value of the granted stock-based awards is calculated at each reporting date using the Black-Scholes option pricing model. During the three months ended March 31, 2014, the Company granted additional stock-based awards to a non-employee which will vest over two years. Stock-based compensation expense related to non-employee grants was $0.1 million for the three months ended March 31, 2015, of which $0.1 million relates to an arrangement with a non-employee customer and has been recorded as a reduction of revenue in the condensed consolidated statements of operations. Stock-based compensation expense for non-employees was $0.1 million for the three months ended March 31, 2014.

Net_Income_Loss_Per_Share_of_C

Net Income (Loss) Per Share of Common Stock	3 Months Ended
	Mar. 31, 2015
Earnings Per Share [Abstract]
Net Income (Loss) Per Share of Common Stock	Net Income (Loss) per Share of Common Stock
	Basic net income (loss) per share of common stock is calculated by dividing the net income (loss) by the weighted-average number of shares of common stock outstanding for the period. Diluted net income (loss) per share of common stock is computed by giving effect to all potentially dilutive securities outstanding during the period, including stock options, restricted stock units and common stock issuable pursuant to the ESPP.
	A reconciliation of the numerator and denominator used in the calculation of the basic and diluted net income (loss) per share is as follows:
		Three Months Ended
		March 31,
		2015				2014
	Numerator
	Net income (loss) (in thousands)	$	(2,129	)		$	(7,337	)
	Denominator
	Weighted average shares of common stock outstanding used in computing net income (loss) per share, basic	38,383,022				37,215,697
	Dilutive effect of incremental shares and share equivalents	—				—
	Weighted average shares of common stock outstanding used in computing net income (loss) per share, diluted	38,383,022				37,215,697
	Net income (loss) per share:
	Net income (loss) per share, basic	$	(0.06	)		$	(0.20	)
	Net income (loss) per share, diluted	$	(0.06	)		$	(0.20	)
	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
		March 31,
		2015			2014
	Options to purchase common stock	3,025,095			3,534,340
	Restricted stock units	1,498,245			1,730,064
	Common stock issuable pursuant to the ESPP	8,874			—
	Total	4,532,214			5,264,404

Income_Taxes

Income Taxes	3 Months Ended
	Mar. 31, 2015
Income Tax Disclosure [Abstract]
Income Taxes	Income Taxes
	The Company recorded income tax expense of $28,000 for the three months ended March 31, 2015, compared to income tax expense of $0.1 million for the three months ended March 31, 2014. The income tax expense for the three months ended March 31, 2015 and 2014, reflects the mixture and distribution of pre-tax income in the Company's operating jurisdictions. The Company continues to maintain a valuation allowance for its U.S. federal and state deferred tax assets.
	At March 31, 2015, the Company had $1.5 million of unrecognized tax benefits, of which $25,000, if recognized, would affect the effective tax rate due to the valuation allowance that currently offsets deferred tax assets. The Company recognizes interest and penalties related to uncertain tax positions as part of the income tax provision. To date, such interest and penalties have not been material.
	The Company files annual income tax returns in multiple taxing jurisdictions around the world, including the U.S. federal and state jurisdictions, and the United Kingdom. A number of years may elapse before an uncertain tax position is audited and finally resolved. While it is often difficult to predict the final outcome or the timing of resolution of any particular uncertain tax position, the Company believes that its reserves for income taxes reflect the most likely outcome. The Company adjusts these reserves, as well as the related interest, in light of changing facts and circumstances. Settlement of any particular position could require the use of cash. As of March 31, 2015, changes to the Company's uncertain tax positions in the next 12 months that are reasonably possible are not expected to have a significant impact on the Company's financial position or results of operations.
	The utilization of the net operating loss ("NOL") carryforwards is subject to annual limitations under Section 382 of the Internal Revenue Code. Section 382 imposes limitations on a corporation’s ability to utilize its NOL carryforwards if it experiences an “ownership change.” In general terms, an ownership change results from transactions increasing the ownership of certain stockholders in the stock of a corporation by more than 50% over a three-year period. Once an ownership change is deemed to have occurred under Section 382, a limitation on the annual utilization of NOL carryforwards is imposed and, therefore, a portion of the tax loss carryforwards would be subject to the limitation under Section 382. If an ownership change were to occur, the annual limitations under Section 382 are not expected to adversely impact the Company's ability to utilize its net operating losses prior to their expiration.

Segment_Information

Segment Information	3 Months Ended
	Mar. 31, 2015
Segment Reporting [Abstract]
Segment Information	Segment Information
	Operating segments are defined as components of an enterprise about which separate financial information is available that is evaluated regularly by the chief operating decision maker, or decision making group, in deciding how to allocate resources and in assessing performance. The Company’s chief operating decision maker is its Chief Executive Officer. The Company has one business activity and there are no segment managers who are held accountable for operations. Accordingly, the Company has a single reportable segment structure. All of the Company’s principal operations and decision-making functions are located in the United States.
	The Company’s revenue by geographic region, based on the location to where the product was shipped, is summarized as follows (in thousands):
		Three Months Ended
		March 31,
		2015		2014
	North America	$	35,229	$	22,787
	International	16,329		8,188
	Total	$	51,558	$	30,975
	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 $33.2 million for the three months ended March 31, 2015, compared to $20.9 million for the three months ended March 31, 2014.
	The following table sets forth revenue by product expressed as dollar amounts (in thousands):
		Three Months Ended
		March 31,
		2015		2014
	System revenue	$	26,156	$	14,461
	Consumable revenue	25,402		16,514
	Total	$	51,558	$	30,975
	Substantially all of the Company’s long-lived assets are located in the United States of America.

Basis_of_Presentation_and_Summ1

Basis of Presentation and Summary of Significant Accounting Policies (Policies)	3 Months Ended
	Mar. 31, 2015
Organization, Consolidation and Presentation of Financial Statements [Abstract]
Basis of Presentation	Basis of Presentation
	The accompanying interim condensed consolidated financial statements of ZELTIQ Aesthetics, Inc. (the "Company") are unaudited. These interim condensed consolidated financial statements have been prepared in accordance with generally accepted accounting principles in the United States of America, or GAAP, and the applicable rules and regulations of the Securities and Exchange Commission, or SEC, for interim financial information. Accordingly, they do not include all of the information and footnotes required by GAAP for complete financial statements. The December 31, 2014, condensed consolidated balance sheet was derived from the audited financial statements as of that date, but does not include all of the information and footnotes required by GAAP for complete financial statements.
	The accompanying unaudited interim condensed consolidated financial statements have been prepared on the same basis as the audited consolidated financial statements and, in the opinion of management, reflect all adjustments of a normal recurring nature considered necessary to state fairly the Company's financial position as of March 31, 2015, results of operations for the three months ended March 31, 2015 and 2014, comprehensive income (loss) for the three months ended March 31, 2015 and 2014, and cash flows for the three months ended March 31, 2015 and 2014. The interim results for the three months ended March 31, 2015, are not necessarily indicative of the results that may be expected for the year ending December 31, 2015, or for any other future annual or interim period. Certain amounts in the prior year's condensed consolidated statement of balance sheets have been reclassified to conform to the current period's presentation. These reclassifications had no impact on previously reported consolidated balance sheets or results of consolidated statements of operations.
	The information included in this Quarterly Report on Form 10-Q should be read in conjunction with “Management’s Discussion and Analysis of Financial Condition and Results of Operations," “Quantitative and Qualitative Disclosures About Market Risk” and the Consolidated Financial Statements and notes thereto included in Items 7, 7A and 8, respectively, in the Company's Annual Report on Form 10-K for the year ended December 31, 2014.
Principles of Consolidation	Principles of Consolidation
	The condensed consolidated financial statements include the accounts of the Company and its wholly-owned subsidiaries. All significant intercompany accounts and transactions have been eliminated.
Foreign Currency	The functional currency of the Company’s international subsidiaries is evaluated on a case-by-case basis and has been determined to be the local currency. 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 material changes to the Company’s critical accounting policies during the three months ended March 31, 2015, as compared to the critical accounting policies described in the Company’s Annual Report on Form 10-K for the year ended December 31, 2014.
Recent Accounting Pronouncements	Recent Accounting Pronouncements
	On May 28, 2014, the Financial Accounting Standards Board, or FASB, issued Accounting Standards Update No. 2014-10, Revenue from Contracts with Customers. The objective of this update is to provide a single, comprehensive revenue recognition model for all contracts with customers to improve comparability within industries, across industries, and across capital markets. This standard update contains principles that the Company will apply to determine the measurement of revenue and timing of when it is recognized. This guidance allows for two methods of adoption: (a) full retrospective adoption, meaning the guidance is applied to all periods presented, or (b) modified retrospective adoption, meaning the cumulative effect of applying this guidance is recognized as an adjustment to the fiscal 2017 opening Accumulated deficit balance. The Company will adopt this guidance effective January 1, 2017, and is currently evaluating the two adoption methods as well as the impact this new guidance will have on the consolidated financial statements and related disclosures.
	In August 2014, the FASB issued Accounting Standards Update No. 2014-15, Disclosure of Uncertainties About an Entity's Ability to Continue as a Going Concern. This standard update provides guidance around management's responsibility to evaluate whether there is substantial doubt about an entity's ability to continue as a going concern and to provide related footnote disclosures. The new guidance is effective for all annual and interim periods ending after December 15, 2016. The new guidance will not have an impact on the Company's consolidated financial statements.
Fair Value of Financial Instruments	Fair value is defined as the price that would be received to sell an asset or paid to transfer a liability (an exit price) in an orderly transaction between market participants at the reporting date. The accounting guidance establishes a three-tiered hierarchy, which prioritizes the inputs used in the valuation methodologies in measuring fair value:
	•Level 1—Quoted prices in active markets for identical assets or liabilities.
	•Level 2—Inputs other than Level 1 that are observable, either directly or indirectly, such as quoted prices in markets that are not active, or other inputs that are observable or can be corroborated by observable market data for substantially the full term of the assets or liabilities.
	•Level 3—Unobservable inputs that are supported by little or no market activity and that are significant to the fair value of the assets or liabilities. The Company did not hold any Level 3 assets or liabilities at March 31, 2015.
	The categorization of a financial instrument within the valuation hierarchy is based on the lowest level of input that is significant to the fair value measurement.
Inventory	Inventory is stated at the lower of cost (which approximates actual cost on a first-in, first-out basis) or market, computed on a standard cost basis. Inventory that is obsolete or in excess of forecasted usage is written down to its estimated net realizable value based on assumptions about future demand and market conditions.

Fair_Value_of_Financial_Instru1

Fair Value of Financial Instruments (Tables)	3 Months Ended
	Mar. 31, 2015
Fair Value Disclosures [Abstract]
Fair value of financial assets and liabilities by level within fair value hierarchy	The following tables set forth the fair value of the Company’s financial assets and liabilities by level within the fair value hierarchy (in thousands):
		As of March 31, 2015
		Level 1		Level 2		Level 3		Fair Value
	Financial Assets
	Cash equivalents:
	Money market funds	$	4,962	$	—	$	—	$	4,962
	Short-term investments:
	U.S. Agency securities	—		5,253		—		5,253
	U.S. Treasury	—		1,002		—		1,002
	Corporate bonds	—		7,734		—		7,734
	Commercial paper	—		600		—		600
	Certificates of deposit	1,233		—		—		1,233
	Long-term investments:
	U.S. Agency securities	—		850		—		850
	Corporate bonds	—		250		—		250
	Certificates of deposit	2,311		—		—		2,311
	Total	$	8,506	$	15,689	$	—	$	24,195
		As of December 31, 2014
		Level 1		Level 2		Level 3		Fair Value
	Financial Assets
	Cash equivalents:
	Money market funds	$	6,062	$	—	$	—	$	6,062
	Short-term investments:
	U.S. Agency securities	—		5,240		—		5,240
	U.S. Treasury	—		1,004		—		1,004
	Corporate bonds	—		7,774		—		7,774
	Commercial paper	—		1,349		—		1,349
	Certificates of deposit	919		—		—		919
	Long-term investments:
	U.S. Agency securities	—		999		—		999
	U.S. Treasury	—		500		—		500
	Corporate bonds	—		750		—		750
	Certificates of deposit	2,556		—		—		2,556
	Total	$	9,537	$	17,616	$	—	$	27,153

Balance_Sheet_Components_Table

Balance Sheet Components (Tables)	3 Months Ended
	Mar. 31, 2015
Organization, Consolidation and Presentation of Financial Statements [Abstract]
Schedule of Investments	The Company's short-term and long-term investments as of March 31, 2015, are as follows (in thousands):
	Short-term
		Amortized Cost			Gross Unrealized Gains			Gross Unrealized Losses			Fair Value
	U.S. Agency securities	$	5,252		$	1		$	—		$	5,253
	U.S. Treasury	1,001			1			—			1,002
	Corporate bonds	7,737			2			(5		)	7,734
	Commercial paper	600			—			—			600
	Certificates of deposit	1,233			—			—			1,233
	Total	$	15,823		$	4		$	(5	)	$	15,822
	Long-term
		Amortized Cost			Gross Unrealized Gains			Gross Unrealized Losses			Fair Value
	U.S. Agency securities	$	850		$	—		$	—		$	850
	Corporate bonds	250			—			—			250
	Certificates of deposit	2,311			—			—			2,311
	Total	$	3,411		$	—		$	—		$	3,411
	The Company's short-term and long-term investments as of December 31, 2014, are as follows (in thousands):
	Short-term
		Amortized Cost			Gross Unrealized Gains			Gross Unrealized Losses			Fair Value
	U.S. Agency securities	$	5,240		$	1		$	(1	)	$	5,240
	U.S. Treasury	1,003			1			—			1,004
	Corporate bonds	7,778			2			(6		)	7,774
	Commercial paper	1,349			—			—			1,349
	Certificates of deposit	919			—			—			919
	Total	$	16,289		$	4		$	(7	)	$	16,286
	Long-term
		Amortized Cost			Gross Unrealized Gains			Gross Unrealized Losses			Fair Value
	U.S. Agency securities	$	1,000		$	—		$	(1	)	$	999
	U.S. Treasury	500			—			—			500
	Corporate bonds	752			—			(2		)	750
	Certificates of deposit	2,556			—			—			2,556
	Total	$	4,808		$	—		$	(3	)	$	4,805
Schedule of Contractual Maturities of Investments	The contractual maturities of the Company's short-term and long-term investments as of March 31, 2015, are as follows (in thousands):
		March 31, 2015
		Amortized Cost			Fair Value
	Due in one year or less	$	15,823		$	15,822
	Due in one year to five years	3,411			3,411
		$	19,234		$	19,233
Schedule of Inventory	The components of inventory consist of the following (in thousands):
		March 31,			December 31,
		2015			2014
	Raw materials	$	7,906		$	7,692
	Finished goods	9,447			7,844
	Total inventory	$	17,353		$	15,536
Schedule of Property and Equipment, Net	Property and equipment, net comprised the following (in thousands):
		March 31,			December 31,
		2015			2014
	Lab equipment, tooling and molds	$	2,707		$	2,766
	Computer software	1,813			1,337
	Computer equipment	1,106			984
	Leasehold improvements	1,443			1,452
	Furniture and fixtures	569			494
	Vehicles	35			35
	Total property and equipment	7,673			7,068
	Less: Accumulated depreciation and amortization	(4,407		)	(4,111		)
	Construction in progress	342			767
	Property and equipment, net	$	3,608		$	3,724
Schedule of Accrued Liabilities	The following table shows the components of accrued liabilities (in thousands):
		March 31,			December 31,
		2015			2014
	Accrued payroll and employee related expenses	$	6,592		$	8,386
	Accrued marketing expenses	2,870			2,959
	Accrued royalty	3,494			3,612
	Sales and other taxes payable	1,971			2,123
	Advance payments from customers	1,244			1,908
	Accrued warranty	440			569
	Accrued legal expenses	1,917			592
	Other accrued liabilities	1,696			1,301
	Total accrued liabilities	$	20,224		$	21,450
Schedule of Product Warranty Accrual	The estimated product warranty accrual was as follows (in thousands):
		Three Months Ended
		March 31,
		2015			2014
	Balance at the beginning of the period	$	569		$	676
	Change in accruals for warranties issued	(29		)	39
	Settlements of warranty claims	(100		)	(55		)
	Balance at the end of the period	$	440		$	660

Intangible_Asset_Net_Tables

Intangible Asset, Net (Tables)	3 Months Ended
	Mar. 31, 2015
Goodwill and Intangible Assets Disclosure [Abstract]
Schedule of Intangible Assets, Net	Intangible asset, net comprised the following (in thousands):
		March 31,			December 31,
		2015			2014
	Purchased technology	$	8,050		$	8,050
	Less: Accumulated amortization	(2,445		)	(2,270		)
	Intangible asset, net	$	5,605		$	5,780
Schedule of Total Estimated Annual Future Amortization Expense	The total estimated annual future amortization expense of this intangible asset as of March 31, 2015, is as follows (in thousands):
	Fiscal Year
	2015 (remaining 9 months)	$	526
	2016	701
	2017	701
	2018	701
	2019	701
	Thereafter	2,275
	Total	$	5,605

Commitments_and_Contingencies_

Commitments and Contingencies (Tables)	3 Months Ended
	Mar. 31, 2015
Commitments and Contingencies Disclosure [Abstract]
Schedule of Future Minimum Rental Payments for Operating Leases	Future minimum lease payments under the non-cancellable operating leases as of March 31, 2015, are as follows (in thousands):
	Year Ending December 31,	Amount
	2015 (remaining 9 months)	$	1,504
	2016	1,761
	2017	1,798
	2018	1,845
	2019	694
	Thereafter	228
	Total future minimum lease payments	$	7,830
Schedule of Capital Leased Assets	Property and equipment includes amounts under leases that have been capitalized as follows (in thousands):
		Useful life (Years)		31-Mar-15			December 31,
							2014
	Computer equipment	3		382			382
	Total capital leased equipment			382			382
	Less: Accumulated depreciation and amortization			(53		)	(21		)
	Capital leased equipment, net			$	329		$	361
Schedule of Future Minimum Payments Required Under Capital Leases	Future minimum payments required under capital leases as of March 31, 2015, are as follows (in thousands):
	Year Ending December 31,	Amount
	2015 (remaining 9 months)	$	100
	2016	132
	2017	141
	Total future payments	$	373
	Less: Amount representing interest	$	20
	Present value of future minimum payments	353
	Less: Current portion	121
	Long term portion	$	232

StockBased_Compensation_Expens1

Stock-Based Compensation Expense (Tables)	3 Months Ended
	Mar. 31, 2015
Disclosure of Compensation Related Costs, Share-based Payments [Abstract]
Stock Options Activity	Activity under the Company’s stock-based compensation plans is set forth below:
						Options Outstanding
			Shares			Number of		Weighted-
			Available			Stock Options		Average
			for Grant			Outstanding		Exercise
								Price
	Balance, December 31, 2014		2,685,209			3,242,421		$	6.47
	Additional shares reserved		1,000,000			—		—
	Options granted		(45,622	)		45,622		34.65
	Restricted stock units granted		(353,757	)		—		—
	Options exercised		—			(252,855	)	5.32
	Options canceled		10,093			(10,093	)	5.1
	Restricted stock units canceled		58,392			—		—
	Restricted stock units withheld for tax		133,035			—		—
	Balance, March 31, 2015		3,487,350			3,025,095		$	6.99
Restricted Stock Activity	Activity related to restricted stock units and awards is set forth below:
			Number of Units and Awards			Weighted-
						Average
						Grant Date Fair Value
	Balance, December 31, 2014		1,533,081			$	10.08
	Restricted stock units granted		353,757			31.95
	Restricted stock units vested		(330,201	)		8.77
	Restricted stock units canceled		(58,392	)		8.74
	Balance, March 31, 2015		1,498,245			$	15.58
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
		March 31,
		2015				2014
	Revenue	$	80			$	—
	Cost of revenue	134				93
	Research and development	350				206
	Sales and marketing	1,551				936
	General and administrative	2,035				870
	Total stock-based compensation	$	4,150			$	2,105
Summary of Fair Value of Employee Stock Option Assumptions	The fair value of employee stock options was estimated using the following weighted-average assumptions:
		Three Months Ended
		March 31,
		2015			2014
	Expected term (in years)	4.8			4.4
	Expected volatility	63	%		43	%
	Risk-free interest rate	1.29	%		1.11	%
	Expected dividend yield	—	%		—	%

Net_Income_Loss_Per_Share_of_C1

Net Income (Loss) Per Share of Common Stock (Tables)	3 Months Ended
	Mar. 31, 2015
Earnings Per Share [Abstract]
Schedule of Earnings Per Share, Basic and Diluted	A reconciliation of the numerator and denominator used in the calculation of the basic and diluted net income (loss) per share is as follows:
		Three Months Ended
		March 31,
		2015				2014
	Numerator
	Net income (loss) (in thousands)	$	(2,129	)		$	(7,337	)
	Denominator
	Weighted average shares of common stock outstanding used in computing net income (loss) per share, basic	38,383,022				37,215,697
	Dilutive effect of incremental shares and share equivalents	—				—
	Weighted average shares of common stock outstanding used in computing net income (loss) per share, diluted	38,383,022				37,215,697
	Net income (loss) per share:
	Net income (loss) per share, basic	$	(0.06	)		$	(0.20	)
	Net income (loss) per share, diluted	$	(0.06	)		$	(0.20	)
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
		March 31,
		2015			2014
	Options to purchase common stock	3,025,095			3,534,340
	Restricted stock units	1,498,245			1,730,064
	Common stock issuable pursuant to the ESPP	8,874			—
	Total	4,532,214			5,264,404

Segment_Information_Tables

Segment Information (Tables)	3 Months Ended
	Mar. 31, 2015
Segment Reporting [Abstract]
Revenue By Geographic Region	The Company’s revenue by geographic region, based on the location to where the product was shipped, is summarized as follows (in thousands):
		Three Months Ended
		March 31,
		2015		2014
	North America	$	35,229	$	22,787
	International	16,329		8,188
	Total	$	51,558	$	30,975
Revenue By Product	The following table sets forth revenue by product expressed as dollar amounts (in thousands):
		Three Months Ended
		March 31,
		2015		2014
	System revenue	$	26,156	$	14,461
	Consumable revenue	25,402		16,514
	Total	$	51,558	$	30,975

Basis_of_Presentation_and_Summ2

Basis of Presentation and Summary of Significant Accounting Policies (Details) (Customer Concentration Risk [Member])	3 Months Ended
	Mar. 31, 2015
	customer
Accounts Receivable [Member]
Concentration Risk [Line Items]
Concentration risk, number	1
Concentration risk, percentage	25.00%
Total Revenue [Member]
Concentration Risk [Line Items]
Concentration risk, number	1
Concentration risk, percentage	11.00%

Fair_Value_of_Financial_Instru2

Fair Value of Financial Instruments (Details) (USD $)	Mar. 31, 2015	Dec. 31, 2014
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Available-for-sale securities, fair value disclosure	$19,233,000
Assets, fair value disclosure	24,195,000	27,153,000
Money Market Funds [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Cash equivalents, fair value disclosure	4,962,000	6,062,000
Short-term Investments [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Available-for-sale securities, fair value disclosure	15,822,000	16,286,000
Short-term Investments [Member] | U.S. Agency securities [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Available-for-sale securities, fair value disclosure	5,253,000	5,240,000
Short-term Investments [Member] | U.S. Treasury [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Available-for-sale securities, fair value disclosure	1,002,000	1,004,000
Short-term Investments [Member] | Corporate bonds [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Available-for-sale securities, fair value disclosure	7,734,000	7,774,000
Short-term Investments [Member] | Commercial Paper [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Available-for-sale securities, fair value disclosure	600,000	1,349,000
Short-term Investments [Member] | Certificates of Deposit [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Available-for-sale securities, fair value disclosure	1,233,000	919,000
Long-term Investments [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Available-for-sale securities, fair value disclosure	3,411,000	4,805,000
Long-term Investments [Member] | U.S. Agency securities [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Available-for-sale securities, fair value disclosure	850,000	999,000
Long-term Investments [Member] | U.S. Treasury [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Available-for-sale securities, fair value disclosure		500,000
Long-term Investments [Member] | Corporate bonds [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Available-for-sale securities, fair value disclosure	250,000	750,000
Long-term Investments [Member] | Certificates of Deposit [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Available-for-sale securities, fair value disclosure	2,311,000	2,556,000
Level 1 [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Assets, fair value disclosure	8,506,000	9,537,000
Level 1 [Member] | Money Market Funds [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Cash equivalents, fair value disclosure	4,962,000	6,062,000
Level 1 [Member] | Short-term Investments [Member] | U.S. Agency securities [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Available-for-sale securities, fair value disclosure	0	0
Level 1 [Member] | Short-term Investments [Member] | U.S. Treasury [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Available-for-sale securities, fair value disclosure	0	0
Level 1 [Member] | Short-term Investments [Member] | Corporate bonds [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Available-for-sale securities, fair value disclosure	0	0
Level 1 [Member] | Short-term Investments [Member] | Commercial Paper [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Available-for-sale securities, fair value disclosure	0	0
Level 1 [Member] | Short-term Investments [Member] | Certificates of Deposit [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Available-for-sale securities, fair value disclosure	1,233,000	919,000
Level 1 [Member] | Long-term Investments [Member] | U.S. Agency securities [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Available-for-sale securities, fair value disclosure	0	0
Level 1 [Member] | Long-term Investments [Member] | U.S. Treasury [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Available-for-sale securities, fair value disclosure		0
Level 1 [Member] | Long-term Investments [Member] | Corporate bonds [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Available-for-sale securities, fair value disclosure	0	0
Level 1 [Member] | Long-term Investments [Member] | Certificates of Deposit [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Available-for-sale securities, fair value disclosure	2,311,000	2,556,000
Level 2 [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Assets, fair value disclosure	15,689,000	17,616,000
Level 2 [Member] | Money Market Funds [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Cash equivalents, fair value disclosure	0	0
Level 2 [Member] | Short-term Investments [Member] | U.S. Agency securities [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Available-for-sale securities, fair value disclosure	5,253,000	5,240,000
Level 2 [Member] | Short-term Investments [Member] | U.S. Treasury [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Available-for-sale securities, fair value disclosure	1,002,000	1,004,000
Level 2 [Member] | Short-term Investments [Member] | Corporate bonds [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Available-for-sale securities, fair value disclosure	7,734,000	7,774,000
Level 2 [Member] | Short-term Investments [Member] | Commercial Paper [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Available-for-sale securities, fair value disclosure	600,000	1,349,000
Level 2 [Member] | Short-term Investments [Member] | Certificates of Deposit [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Available-for-sale securities, fair value disclosure	0	0
Level 2 [Member] | Long-term Investments [Member] | U.S. Agency securities [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Available-for-sale securities, fair value disclosure	850,000	999,000
Level 2 [Member] | Long-term Investments [Member] | U.S. Treasury [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Available-for-sale securities, fair value disclosure		500,000
Level 2 [Member] | Long-term Investments [Member] | Corporate bonds [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Available-for-sale securities, fair value disclosure	250,000	750,000
Level 2 [Member] | Long-term Investments [Member] | Certificates of Deposit [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Available-for-sale securities, fair value disclosure	0	0
Level 3 [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Assets, fair value disclosure	0	0
Liabilities, fair value disclosure	0	0
Level 3 [Member] | Money Market Funds [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Cash equivalents, fair value disclosure	0	0
Level 3 [Member] | Short-term Investments [Member] | U.S. Agency securities [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Available-for-sale securities, fair value disclosure	0	0
Level 3 [Member] | Short-term Investments [Member] | U.S. Treasury [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Available-for-sale securities, fair value disclosure	0	0
Level 3 [Member] | Short-term Investments [Member] | Corporate bonds [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Available-for-sale securities, fair value disclosure	0	0
Level 3 [Member] | Short-term Investments [Member] | Commercial Paper [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Available-for-sale securities, fair value disclosure	0	0
Level 3 [Member] | Short-term Investments [Member] | Certificates of Deposit [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Available-for-sale securities, fair value disclosure	0	0
Level 3 [Member] | Long-term Investments [Member] | U.S. Agency securities [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Available-for-sale securities, fair value disclosure	0	0
Level 3 [Member] | Long-term Investments [Member] | U.S. Treasury [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Available-for-sale securities, fair value disclosure		0
Level 3 [Member] | Long-term Investments [Member] | Corporate bonds [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Available-for-sale securities, fair value disclosure	0	0
Level 3 [Member] | Long-term Investments [Member] | Certificates of Deposit [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Available-for-sale securities, fair value disclosure	$0	$0

Balance_Sheet_Components_Inves

Balance Sheet Components - Investments (Details) (USD $)	Mar. 31, 2015	Dec. 31, 2014
In Thousands, unless otherwise specified
Schedule of Available-for-sale Securities [Line Items]
Amortized Cost	$19,234
Fair Value	19,233
Short-term Investments [Member]
Schedule of Available-for-sale Securities [Line Items]
Amortized Cost	15,823	16,289
Gross Unrealized Gains	4	4
Gross Unrealized Losses	-5	-7
Fair Value	15,822	16,286
Short-term Investments [Member] | U.S. Agency securities [Member]
Schedule of Available-for-sale Securities [Line Items]
Amortized Cost	5,252	5,240
Gross Unrealized Gains	1	1
Gross Unrealized Losses	0	-1
Fair Value	5,253	5,240
Short-term Investments [Member] | U.S. Treasury [Member]
Schedule of Available-for-sale Securities [Line Items]
Amortized Cost	1,001	1,003
Gross Unrealized Gains	1	1
Gross Unrealized Losses	0	0
Fair Value	1,002	1,004
Short-term Investments [Member] | Corporate bonds [Member]
Schedule of Available-for-sale Securities [Line Items]
Amortized Cost	7,737	7,778
Gross Unrealized Gains	2	2
Gross Unrealized Losses	-5	-6
Fair Value	7,734	7,774
Short-term Investments [Member] | Commercial paper [Member]
Schedule of Available-for-sale Securities [Line Items]
Amortized Cost	600	1,349
Gross Unrealized Gains	0	0
Gross Unrealized Losses	0	0
Fair Value	600	1,349
Short-term Investments [Member] | Certificates of deposit [Member]
Schedule of Available-for-sale Securities [Line Items]
Amortized Cost	1,233	919
Gross Unrealized Gains	0	0
Gross Unrealized Losses	0	0
Fair Value	1,233	919
Long-term Investments [Member]
Schedule of Available-for-sale Securities [Line Items]
Amortized Cost	3,411	4,808
Gross Unrealized Gains	0	0
Gross Unrealized Losses	0	-3
Fair Value	3,411	4,805
Long-term Investments [Member] | U.S. Agency securities [Member]
Schedule of Available-for-sale Securities [Line Items]
Amortized Cost	850	1,000
Gross Unrealized Gains	0	0
Gross Unrealized Losses	0	-1
Fair Value	850	999
Long-term Investments [Member] | U.S. Treasury [Member]
Schedule of Available-for-sale Securities [Line Items]
Amortized Cost		500
Gross Unrealized Gains		0
Gross Unrealized Losses		0
Fair Value		500
Long-term Investments [Member] | Corporate bonds [Member]
Schedule of Available-for-sale Securities [Line Items]
Amortized Cost	250	752
Gross Unrealized Gains	0	0
Gross Unrealized Losses	0	-2
Fair Value	250	750
Long-term Investments [Member] | Certificates of deposit [Member]
Schedule of Available-for-sale Securities [Line Items]
Amortized Cost	2,311	2,556
Gross Unrealized Gains	0	0
Gross Unrealized Losses	0	0
Fair Value	$2,311	$2,556

Balance_Sheet_Components_Inves1

Balance Sheet Components - Investments, Contractual Maturities (Details) (USD $)	Mar. 31, 2015
In Thousands, unless otherwise specified
Organization, Consolidation and Presentation of Financial Statements [Abstract]
Amortized Cost, Due in one year or less	$15,823
Amortized Cost, Due in one year to five years	3,411
Amortized Cost	19,234
Fair Value, Due in one year or less	15,822
Fair Value, Due in one year to five years	3,411
Fair Value	$19,233

Balance_Sheet_Components_Inven

Balance Sheet Components - Inventory (Details) (USD $)	Mar. 31, 2015	Dec. 31, 2014
In Thousands, unless otherwise specified
Inventory, Net [Abstract]
Raw materials	$7,906	$7,692
Finished goods	9,447	7,844
Total inventory	$17,353	$15,536

Balance_Sheet_Components_Prope

Balance Sheet Components - Property and Equipment, Net (Details) (USD $)	3 Months Ended
	Mar. 31, 2015	Mar. 31, 2014	Dec. 31, 2014
Property, Plant and Equipment [Line Items]
Property, plant and equipment, gross	$7,673,000		$7,068,000
Less: Accumulated depreciation and amortization	-4,407,000		-4,111,000
Property and equipment, net	3,608,000		3,724,000
Property and equipment acquired under capital leases	382,000		382,000
Depreciation expense	300,000	300,000
Lab equipment, tooling and molds [Member]
Property, Plant and Equipment [Line Items]
Property, plant and equipment, gross	2,707,000		2,766,000
Computer software [Member]
Property, Plant and Equipment [Line Items]
Property, plant and equipment, gross	1,813,000		1,337,000
Computer equipment [Member]
Property, Plant and Equipment [Line Items]
Property, plant and equipment, gross	1,106,000		984,000
Property and equipment acquired under capital leases	382,000		382,000
Leasehold improvements [Member]
Property, Plant and Equipment [Line Items]
Property, plant and equipment, gross	1,443,000		1,452,000
Furniture and fixtures [Member]
Property, Plant and Equipment [Line Items]
Property, plant and equipment, gross	569,000		494,000
Vehicles [Member]
Property, Plant and Equipment [Line Items]
Property, plant and equipment, gross	35,000		35,000
Construction in Progress [Member]
Property, Plant and Equipment [Line Items]
Property, plant and equipment, gross	$342,000		$767,000

Balance_Sheet_Components_Accru

Balance Sheet Components - Accrued Liabilities (Details) (USD $)	Mar. 31, 2015	Dec. 31, 2014
In Thousands, unless otherwise specified
Organization, Consolidation and Presentation of Financial Statements [Abstract]
Accrued payroll and employee related expenses	$6,592	$8,386
Accrued marketing expenses	2,870	2,959
Accrued royalty	3,494	3,612
Sales and other taxes payable	1,971	2,123
Advance payments from customers	1,244	1,908
Accrued warranty	440	569
Accrued legal expenses	1,917	592
Other accrued liabilities	1,696	1,301
Total accrued liabilities	$20,224	$21,450

Balance_Sheet_Components_Produ

Balance Sheet Components - Product Warranty (Details) (USD $)	3 Months Ended
In Thousands, unless otherwise specified	Mar. 31, 2015	Mar. 31, 2014
Movement in Standard Product Warranty Accrual [Roll Forward]
Balance at the beginning of the period	$569	$676
Change in accruals for warranties issued	-29	39
Settlements of warranty claims	-100	-55
Balance at the end of the period	$440	$660
Direct Customer [Member] | Control Units [Member]
Product Liability Contingency [Line Items]
Product Warranty Accrual, Term	1 year
Direct Customer [Member] | Applicators [Member]
Product Liability Contingency [Line Items]
Product Warranty Accrual, Term	1 year
International [Member] | Indirect Customer [Member] | Control Units [Member]
Product Liability Contingency [Line Items]
Product Warranty Accrual, Term	3 years
International [Member] | Indirect Customer [Member] | Applicators [Member]
Product Liability Contingency [Line Items]
Product Warranty Accrual, Term	1 year

Intangible_Asset_Net_Details

Intangible Asset, Net (Details) (USD $)	3 Months Ended
In Millions, unless otherwise specified	Mar. 31, 2015	Mar. 31, 2014
Goodwill and Intangible Assets Disclosure [Abstract]
Amortization of intangible assets	$0.20	$0.20

Intangible_Asset_Net_Intangibl

Intangible Asset, Net - Intangible Asset, Net Comprises (Details) (USD $)	Mar. 31, 2015	Dec. 31, 2014
In Thousands, unless otherwise specified
Goodwill and Intangible Assets Disclosure [Abstract]
Purchased technology	$8,050	$8,050
Less: Accumulated amortization	-2,445	-2,270
Intangible asset, net	$5,605	$5,780

Intangible_Asset_Net_Estimated

Intangible Asset, Net - Estimated Annual Future Amortization Expense (Details) (USD $)	Mar. 31, 2015	Dec. 31, 2014
In Thousands, unless otherwise specified
Intangible Asset, Net, Amortization Expense, Fiscal Year Maturity [Abstract]
2015 (remaining 9 months)	$526
2016	701
2017	701
2018	701
2019	701
Thereafter	2,275
Intangible asset, net	$5,605	$5,780

Related_Party_Transactions_Bra

Related Party Transactions - Brazilian Distribution Agreement (Details) (Distributor [Member], USD $)	3 Months Ended
In Millions, unless otherwise specified	Mar. 31, 2015	Mar. 31, 2014	Dec. 31, 2014
Distributor [Member]
Related Party Transaction [Line Items]
Revenue from related parties	$1.30	$1
Accounts receivable, related parties	$1.40		$0.20

Commitments_and_Contingencies_1

Commitments and Contingencies - Operating Lease Obligations (Details) (USD $)	3 Months Ended
	Mar. 31, 2015	Mar. 31, 2014
Commitments and Contingencies Disclosure [Abstract]
Rent expense	$500,000	$400,000
Operating Leases, Future Minimum Payments Due, Fiscal Year Maturity [Abstract]
2015 (remaining 9 months)	1,504,000
2016	1,761,000
2017	1,798,000
2018	1,845,000
2019	694,000
Thereafter	228,000
Total future minimum lease payments	$7,830,000

Commitments_and_Contingencies_2

Commitments and Contingencies - Capital Lease Obligations (Details) (USD $)	3 Months Ended		12 Months Ended
	Mar. 31, 2015	Mar. 31, 2014	Dec. 31, 2014
Capital Leased Assets [Line Items]
Capital leased equipment, gross	$382,000		$382,000
Less: Accumulated depreciation and amortization	-53,000		-21,000
Capital leased equipment, net	329,000		361,000
Amortization of assets acquired under capital leases	32,000	0
Future minimum payments under capital leases
2015 (remaining 9 months)	100,000
2016	132,000
2017	141,000
Total future payments	373,000
Less: Amount representing interest	20,000
Present value of future minimum payments	353,000
Less: Current portion	121,000		120,000
Long term portion	232,000		262,000
Computer equipment [Member]
Capital Leased Assets [Line Items]
Useful Life	3 years		3 years
Capital leased equipment, gross	$382,000		$382,000

Commitments_and_Contingencies_3

Commitments and Contingencies - Purchase Commitments and Unrecognized Tax Benefits (Details) (USD $)	Mar. 31, 2015	Dec. 31, 2014
Commitments and Contingencies Disclosure [Abstract]
Purchase obligation	$5,800,000	$4,000,000
Unrecognized tax benefits, including estimated interest and penalties	$26,000

StockBased_Compensation_Expens2

Stock-Based Compensation Expense - Stock Options Plan Activity (Details) (USD $)	3 Months Ended
	Mar. 31, 2015	Mar. 31, 2014
Shares Available for Grant
Balance at beginning of period (Shares)	2,685,209
Additional shares reserved (Shares)	1,000,000
Options granted (Shares)	-45,622
Options canceled (Shares)	10,093
Balance at end of period (Shares)	3,487,350
Number of Stock Options Outstanding
Balance at beginning of period (Number of Stock Options Outstanding) (Shares)	3,242,421
Options granted (Shares)	45,622
Options exercised (Number of stock options outstanding) (Shares)	-252,855
Options canceled (Number of Stock Options Outstanding) (Shares)	-10,093
Balance at end of period (Number of Stock Options Outstanding) (Shares)	3,025,095
Weighted-Average Exercise Price
Balance at beginning of period (Weighted average exercise price) (Per Share)	6.47
Options granted (Weighted average exercise price) (Per Share)	34.65
Options exercised (Weighted average exercise price) (Per Share)	5.32
Options canceled (Weighted average exercise price) (Per Share)	5.1
Balance at end of period (Weighted average exercise price) (Per Share)	6.99
Restricted Stock Units (RSUs) [Member]
Shares Available for Grant
Restricted stock units granted (Shares)	-353,757
Restricted stock units canceled (Shares)	58,392
Restricted stock units withheld for tax (Shares)	133,035	134,836

StockBased_Compensation_Expens3

Stock-Based Compensation Expense - Restricted Stock Units (Details) (USD $)	3 Months Ended
In Thousands, except Share data, unless otherwise specified	Mar. 31, 2015	Mar. 31, 2014
Weighted- Average Grant Date Fair Value
Payments for employee's tax obligations to relevant taxing authority	$4,345	$2,546
Restricted Stock Units (RSUs) [Member]
Number of Units and Awards
Balance at beginning of period (Shares)	1,533,081
Restricted stock units granted (Shares)	353,757
Restricted stock units vested (Shares)	-330,201	-319,582
Restricted stock units canceled (Shares)	-58,392
Balance at end of period (Shares)	1,498,245
Weighted- Average Grant Date Fair Value
Balance at beginning of period (Weighted average exercise price) (Per Share)	$10.08
Restricted stock units granted (Weighted average exercise price) (Per Share)	$31.95
Restricted stock units vested (Weighted average exercise price) (Per Share)	$8.77
Restricted stock units canceled (Weighted average exercise price) (Per Share)	$8.74
Balance at end of period (Weighted average exercise price) (Per Share)	$15.58
Restricted stock units withheld for tax (Shares)	133,035	134,836
Payments for employee's tax obligations to relevant taxing authority	$4,300	$2,500

StockBased_Compensation_Expens4

Stock-Based Compensation Expense - Allocation of Stock Based Compensation Expense (Details) (USD $)	3 Months Ended
	Mar. 31, 2015	Mar. 31, 2014
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Stock-based compensation expense	$4,150,000	$2,105,000
Revenue [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Stock-based compensation expense	80,000	0
Cost of Revenue [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Stock-based compensation expense	134,000	93,000
Research and Development [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Stock-based compensation expense	350,000	206,000
Sales and Marketing [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Stock-based compensation expense	1,551,000	936,000
General and Administrative [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Stock-based compensation expense	2,035,000	870,000
Stock Compensation Plan [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Unrecognized compensation cost	21,200,000
Unrecognized compensation cost, recognition period (in years)	1 year 9 months
Performance Based Stock Options and Restricted Stock Units [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Stock-based compensation expense	$1,500,000	$500,000

StockBased_Compensation_Expens5

Stock-Based Compensation Expense - Assumptions (Details) (Stock Options [Member])	3 Months Ended
	Mar. 31, 2015	Mar. 31, 2014
Stock Options [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Expected term	4 years 9 months 20 days	4 years 5 months
Expected volatility	63.00%	43.00%
Risk-free interest rate	1.29%	1.11%
Expected dividend yield	0.00%	0.00%

StockBased_Compensation_Expens6

Stock-Based Compensation Expense - Employee Stock-Based Compensation (Details) (USD $)	3 Months Ended
In Millions, except Share data, unless otherwise specified	Mar. 31, 2015	Mar. 31, 2014
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Options granted (Shares)	45,622
Stock Compensation Plan [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Options granted (Shares)	45,622	70,000
Weighted average grant date fair value (Per Share)	$18.19	$7.69
Unrecognized compensation cost, recognition period (in years)	1 year 9 months
Employee Restricted Stock Units (RSUs) [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Restricted stock units granted (Shares)	353,757	183,800
Weighted average grant date fair value (Per Share)	$31.95	$20.80
ESPP [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Unrecognized compensation cost	$0.20
Unrecognized compensation cost, recognition period (in years)	2 months

StockBased_Compensation_Expens7

Stock-Based Compensation Expense - Non-Employee Stock-Based Compensation (Details) (USD $)	3 Months Ended
	Mar. 31, 2015	Mar. 31, 2014
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Vesting period for non-employee stock-based awards	2 years
Stock-based compensation expense related to non-employee grants	$100,000	$100,000
Stock-based compensation expense	4,150,000	2,105,000
Revenue [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Stock-based compensation expense	$80,000	$0

Net_Income_Loss_Per_Share_of_C2

Net Income (Loss) Per Share of Common Stock (Details) (USD $)	3 Months Ended
In Thousands, except Share data, unless otherwise specified	Mar. 31, 2015	Mar. 31, 2014
Numerator
Net income (loss)	($2,129)	($7,337)
Denominator
Weighted average shares of common stock outstanding used in computing net income (loss) per share, basic	38,383,022	37,215,697
Dilutive effect of incremental shares and share equivalents	0	0
Weighted average shares of common stock outstanding used in computing net income (loss) per share, diluted	38,383,022	37,215,697
Net income (loss) per share:
Net income (loss) per share, basic (dollars per share)	($0.06)	($0.20)
Net income (loss) per share, diluted (dollars per share)	($0.06)	($0.20)

Net_Income_Loss_Per_Share_of_C3

Net Income (Loss) Per Share of Common Stock - Outstanding Shares of Potentially Dilutive Securities (Details)	3 Months Ended
	Mar. 31, 2015	Mar. 31, 2014
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items]
Antidilutive securities excluded from computation of earnings per share, amount (in shares)	4,532,214	5,264,404
Options to purchase common stock [Member]
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items]
Antidilutive securities excluded from computation of earnings per share, amount (in shares)	3,025,095	3,534,340
Restricted Stock Units (RSUs) [Member]
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items]
Antidilutive securities excluded from computation of earnings per share, amount (in shares)	1,498,245	1,730,064
Common stock issuable pursuant to the ESPP [Member]
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items]
Antidilutive securities excluded from computation of earnings per share, amount (in shares)	8,874	0

Income_Taxes_Details

Income Taxes (Details) (USD $)	3 Months Ended
	Mar. 31, 2015	Mar. 31, 2014
Income Tax Disclosure [Abstract]
Income tax expense	$28,000	$79,000
Unrecognized tax benefits	1,500,000
Unrecognized tax benefits that would impact effective tax rate	$25,000

Segment_Information_Details

Segment Information (Details) (USD $)	3 Months Ended
In Thousands, unless otherwise specified	Mar. 31, 2015	Mar. 31, 2014
	manager
	segment
	business_activity
Segment Reporting Information [Line Items]
Number of business activities	1
Number of reportable segments	1
Number of segment managers held accountable for operations	0
Revenue, net	$51,558	$30,975
North America [Member]
Segment Reporting Information [Line Items]
Revenue, net	35,229	22,787
United States [Member]
Segment Reporting Information [Line Items]
Revenue, net	33,200	20,900
International [Member]
Segment Reporting Information [Line Items]
Revenue, net	16,329	8,188
Systems Revenue [Member]
Segment Reporting Information [Line Items]
Revenue, net	26,156	14,461
Consumable Revenue [Member]
Segment Reporting Information [Line Items]
Revenue, net	$25,402	$16,514