Aspen Aerogels (ASPN) 10-K 13 Mar 15 2014 FY Annual report Financial data

Document_and_Entity_Informatio

Document and Entity Information (USD $)	12 Months Ended
In Millions, except Share data, unless otherwise specified	Dec. 31, 2014	Mar. 02, 2015	Jun. 30, 2014
Document And Entity Information [Abstract]
Document Type	10-K
Amendment Flag	FALSE
Document Period End Date	31-Dec-14
Document Fiscal Year Focus	2014
Document Fiscal Period Focus	FY
Trading Symbol	ASPN
Entity Registrant Name	ASPEN AEROGELS INC
Entity Central Index Key	1145986
Current Fiscal Year End Date	-19
Entity Well-known Seasoned Issuer	No
Entity Current Reporting Status	Yes
Entity Voluntary Filers	No
Entity Filer Category	Non-accelerated Filer
Entity Common Stock, Shares Outstanding		22,992,273
Entity Public Float			$207.40

Consolidated_Balance_Sheets

Consolidated Balance Sheets (USD $)	Dec. 31, 2014	Dec. 31, 2013
In Thousands, unless otherwise specified
Current assets:
Cash and cash equivalents	$49,719	$1,574
Accounts receivable, net of allowance for doubtful accounts	17,924	18,762
Inventories	4,897	6,892
Prepaid expenses and other current assets	836	791
Total current assets	73,376	28,019
Property, plant and equipment, net	71,492	62,023
Other assets	175	191
Total assets	145,043	90,233
Current liabilities:
Subordinated notes, current portion		17,306
Convertible notes, current portion		435
Capital leases, current portion	76	75
Revolving line of credit	0	1,000
Accounts payable	14,202	7,114
Accrued expenses	5,588	4,814
Deferred revenue	292	595
Other current liabilities	50	50
Total current liabilities	20,208	31,389
Senior convertible notes		28,135
Convertible notes, excluding current portion		91,439
Capital leases, excluding current portion	89	165
Other long-term liabilities	1,030	1,071
Total liabilities	21,327	152,199
Commitments and contingencies (Note 12)
Stockholders' equity (deficit):
Convertible preferred stock, value
Common stock, $0.00001 par value; 125,000,000 shares authorized, 22,992,273 shares issued and 22,922,273 outstanding at December 31, 2014; 255,702 shares authorized, 3,137 shares issued and outstanding at December 31, 2013	0	0
Additional paid-in capital	522,800	270,794
Accumulated deficit	-399,084	-332,760
Total stockholders' equity (deficit)	123,716	-61,966
Total liabilities, convertible preferred stock and stockholders' equity (deficit)	145,043	90,233
Series C [Member]
Stockholders' equity (deficit):
Convertible preferred stock, value
Series B [Member]
Stockholders' equity (deficit):
Convertible preferred stock, value
Series A [Member]
Stockholders' equity (deficit):
Convertible preferred stock, value

Consolidated_Balance_Sheets_Pa

Consolidated Balance Sheets (Parenthetical) (USD $)	Dec. 31, 2014	Dec. 31, 2013
Convertible preferred stock, par value	$0.00	$0.00
Convertible preferred stock, shares authorized	5,000,000	0
Convertible preferred stock, shares issued	0	0
Convertible preferred stock, shares outstanding	0	0
Common stock, par value	$0.00	$0.00
Common stock, shares authorized	125,000,000	255,702
Common stock, shares issued	22,992,273	3,137
Common stock, shares outstanding	22,992,273	3,137
Series C [Member]
Convertible preferred stock, par value	$0.00	$0.00
Convertible preferred stock, shares authorized	0	116,024,242
Convertible preferred stock, shares issued	0	20,000
Convertible preferred stock, shares outstanding	0	20,000
Series B [Member]
Convertible preferred stock, par value	$0.00	$0.00
Convertible preferred stock, shares authorized	0	1,601,053
Convertible preferred stock, shares issued	0	1,601,053
Convertible preferred stock, shares outstanding	0	1,601,053
Series A [Member]
Convertible preferred stock, par value	$0.00	$0.00
Convertible preferred stock, shares authorized	0	5,284,347
Convertible preferred stock, shares issued	0	5,284,347
Convertible preferred stock, shares outstanding	0	5,284,347

Consolidated_Statements_of_Ope

Consolidated Statements of Operations (USD $)	12 Months Ended
In Thousands, except Share data, unless otherwise specified	Dec. 31, 2014	Dec. 31, 2013	Dec. 31, 2012
Revenue:
Product	$99,259	$82,057	$60,389
Research services	3,140	4,037	3,064
Total revenue	102,399	86,094	63,453
Cost of revenue:
Product	83,677	73,399	70,025
Research services	1,642	1,964	1,396
Gross profit (loss)	17,080	10,731	-7,968
Operating expenses:
Research and development	5,980	5,159	5,142
Sales and marketing	10,290	9,271	8,564
General and administrative	16,853	12,833	11,299
Write-off of construction in progress		3,440
Total operating expenses	33,123	30,703	25,005
Income (loss) from operations	-16,043	-19,972	-32,973
Other income (expense):
Interest expense	-50,281	-30,599	-21,790
Gain on extinguishment of convertible notes		8,898
Loss on exchange of convertible notes		-5,697
Debt extinguishment costs			-1,379
Costs associated with postponed public offering		-241
Total other income (expense), net	-50,281	-27,639	-23,169
Net income (loss)	-66,324	-47,611	-56,142
Net income (loss) attributable to common stockholders	($66,324)	$1,338	($8,941)
Net income (loss) attributable to common stockholders per common share:
Basic	($5.37)	$426.52	($2,851.08)
Diluted	($5.37)	$410.56	($2,851.08)
Weighted-average common shares outstanding:
Basic	12,349,456	3,137	3,136
Diluted	12,349,456	3,259	3,136

Consolidated_Statements_of_Sto

Consolidated Statements of Stockholders' Equity (Deficit) (USD $)	Total	IPO [Member]	Preferred Stock 0.00001 Par Value [Member]	Common Stock 0.00001 Par Value [Member]	Common Stock 0.00001 Par Value [Member]	Additional Paid-in Capital [Member]	Additional Paid-in Capital [Member]	Accumulated Deficit [Member]	Series C Convertible Preferred Stock 0.00001 Par Value [Member]	Series B Convertible Preferred Stock 0.00001 Par Value [Member]	Series A Convertible Preferred Stock 0.00001 Par Value [Member]
In Thousands, except Share data	USD ($)	USD ($)	USD ($)	USD ($)	IPO [Member]	USD ($)	IPO [Member]	USD ($)	USD ($)	USD ($)	USD ($)
							USD ($)
Beginning balance at Dec. 31, 2011	($113,513)					$115,494		($229,007)
Beginning balance, shares at Dec. 31, 2011				3,134
Net income (loss)	-56,142							-56,142
Issuance of common stock	5					5
Issuance of common stock, shares				3
Stock compensation expense	1,654					1,654
Dividends on redeemable convertible preferred stock	-4,191					-4,191
Changes in redeemable convertible preferred stock to redemption value	51,392					51,392
Ending balance at Dec. 31, 2012	-120,795					164,354		-285,149
Ending balance, shares at Dec. 31, 2012				3,137
Net income (loss)	-47,611							-47,611
Stock compensation expense	4,426					4,426
Dividends on redeemable convertible preferred stock	-996					-996
Changes in redemption value of redeemable convertible preferred stock at extinguishment	86,161					86,161
Reclassification of redeemable convertible preferred stock from temporary to permanent equity	1,085					1,085
Reclassification of redeemable convertible preferred stock from temporary to permanent equity, shares										1,601,053	5,284,347
Issuance of Series C convertible preferred stock, shares									20,000
Issuance of Series C preferred stock warrants, net of issuance costs	15,764					15,764
Ending balance at Dec. 31, 2013	-61,966					270,794		-332,760
Ending balance, shares at Dec. 31, 2013				3,137					20,000	1,601,053	5,284,347
Net income (loss)	-66,324							-66,324
Issuance of common stock	3	74,712				3	74,712
Issuance of common stock, shares				31	7,500,000
Stock compensation expense	8,781					8,781
Net cashless exercise of Series C warrants	0		0	0		0		0	0	0	0
Net cashless exercise of Series C warrants, shares									86,997,362
Conversion of convertible preferred stock to common stock	0		0	0		0		0	0	0	0
Conversion of convertible preferred stock to common stock, shares				115,982					-87,017,362	-1,601,053	-5,284,347
Conversion of convertible debt to common stock	168,510					168,510
Conversion of convertible debt to common stock, shares				15,319,034
Issuance of restricted stock				61,816
Issuance of Restricted Stock, shares	0		0	0		0		0	0	0	0
Forfeiture of restricted stock	0		0	0		0		0	0	0	0
Forfeiture of Restricted Stock, shares				-7,727
Ending balance at Dec. 31, 2014	$123,716					$522,800		($399,084)
Ending balance, shares at Dec. 31, 2014				22,992,273

Consolidated_Statements_of_Cas

Consolidated Statements of Cash Flows (USD $)	12 Months Ended
In Thousands, unless otherwise specified	Dec. 31, 2014	Dec. 31, 2013	Dec. 31, 2012
Cash flows from operating activities:
Net income (loss)	($66,324)	($47,611)	($56,142)
Adjustments to reconcile net income (loss) to net cash provided by (used in) operating activities:
Depreciation and amortization	10,183	10,061	9,684
Write-off of construction in progress		3,440
Loss on disposal of assets	119	230	2,489
Debt issuance costs and noncash interest expenses	47	998	2,959
Write-off of costs associated with postponed public offering		241
Accretion of debt to fair value	50,011	18,696	18,678
Gain on extinguishment of convertible notes		-8,898
Loss on exchange of convertible notes		5,697
Issuance of Series C preferred stock warrants in connection with senior convertible notes		10,677
Stock compensation expense	8,781	4,426	1,654
Loss on extinguishment of debt			1,379
Other	-31	-25	-2
Changes in operating assets and liabilities:
Accounts receivable	838	-4,809	-6,796
Inventories	1,995	-547	3,177
Prepaid expenses and other assets	-129	-287	-2
Accounts payable	687	-1,686	1,676
Accrued expenses	774	2,297	1,086
Deferred revenue	-303	-588	281
Other liabilities		-6,000	-6,000
Net cash provided by (used in) operating activities	6,648	-13,688	-25,879
Cash flows from investing activities:
Capital expenditures	-13,241	-3,329	-10,236
Decrease in restricted cash			451
Net cash used in investing activities	-13,241	-3,329	-9,785
Cash flows from financing activities:
Borrowings under line of credit	4,500	19,929	25,515
Repayments under line of credit	-5,500	-20,267	-24,177
Proceeds from issuance of long-term debt		18,500	24,890
Repayment of borrowings under long-term debt	-18,849
Financing costs	-47	-872	-425
Proceeds from initial public offering	74,712
Repayment of obligations under capital lease	-80	-42	-42
Proceeds from issuance of common stock	2		5
Net cash provided by financing activities	54,738	17,248	25,766
Net increase (decrease) in cash	48,145	231	-9,898
Cash at beginning of period	1,574	1,343	11,241
Cash at end of period	49,719	1,574	1,343
Supplemental disclosures of cash flow information:
Interest paid	223	228	152
Income taxes paid	0	0	0
Supplemental disclosures of non-cash activities:
Conversion of convertible and senior convertible notes to common stock	168,510
Accrued dividends on preferred stock		996	4,191
Changes in redemption value of redeemable convertible preferred stock		-86,161	-51,392
Reclassification of redeemable convertible preferred stock from temporary to permanent equity		-1,085
Changes in accrued capital expenditures	6,401	-523	-38
Capitalized interest	34	70	2,270
Capital lease	$5	$160

Description_of_Business

Description of Business	12 Months Ended
	Dec. 31, 2014
Accounting Policies [Abstract]
Description of Business	(1) Description of Business
	Nature of Business
	Aspen Aerogels, Inc. (the Company) is an energy technology company that designs, develops and manufactures innovative, high-performance aerogel insulation. The Company also conducts research and development related to aerogel technology supported by funding from several agencies of the U.S. government and other institutions in the form of research and development contracts.
	The Company maintains its corporate offices in Northborough, Massachusetts. The Company has two wholly owned subsidiaries: Aspen Aerogels Rhode Island, LLC and Aspen Aerogels Germany, GmbH.
	On June 18, 2014, the Company completed an initial public offering (IPO) of 7,500,000 shares of its common stock at a public offering price of $11.00 per share. The Company received net proceeds of $74.7 million after deducting underwriting discounts and commissions of $4.3 million and offering expenses of approximately $3.5 million. Upon the closing of the offering, all of the Company’s then-outstanding (i) warrants to purchase Series C preferred stock, (the “Series C warrants”) were subject to an automatic net cashless exercise, (ii) convertible preferred stock (including the shares of Series C preferred stock issued upon the automatic net cashless exercise of Series C warrants) automatically converted into 115,982 shares of common stock, and (iii) Convertible Notes (see note 8) and Senior Convertible Notes (see note 7) automatically converted into 15,319,034 shares of common stock.
	Prior to the closing of the offering, the Company completed a 1-for-824.7412544 reverse stock split of its common stock. All common shares and related per share amounts in the financial statements and notes have been adjusted retroactively to reflect the reverse stock split.

Summary_of_Basis_of_Presentati

Summary of Basis of Presentation and Significant Accounting Policies	12 Months Ended
	Dec. 31, 2014
Accounting Policies [Abstract]
Summary of Basis of Presentation and Significant Accounting Policies	(2) Summary of Basis of Presentation and Significant Accounting Policies
	Principles of Consolidation
	The accompanying consolidated financial statements, which have been prepared in accordance with generally accepted accounting principles in the United States of America, include the accounts of the Company and its wholly owned subsidiaries. All intercompany balances and transactions have been eliminated in consolidation.
	Reclassification
	The December 31, 2013 balance sheet reflects a $0.2 million reclassification of the Company’s sales returns reserve from a component of accrued expenses to a reduction of accounts receivable, a $0.1 million reclassification of other assets to prepaid expenses and other current assets and a reclassification of $0.1 million of other long term liabilities to other current liabilities to conform to the current period’s presentation. The change has no impact on the results of operations.
	Use of Estimates
	The preparation of the consolidated financial statements requires the Company to make a number of estimates and assumptions that affect the reported amounts of assets and liabilities at the date of the consolidated financial statements and the reported amounts of revenues and expenses during the reporting period. Significant items subject to such estimates and assumptions include allowances for doubtful accounts, inventory valuation, the carrying amount of property and equipment, fair value of debt and capital stock, stock-based compensation and deferred income taxes. The Company evaluates its estimates and assumptions on an on-going basis using historical experience and other factors, including the current economic environment, which it believes to be reasonable under the circumstances. Management adjusts such estimates and assumptions when facts and circumstances dictate. Illiquid credit markets, volatile equity markets and declines in business investment increase the uncertainty inherent in such estimates and assumptions. As future events and their effects cannot be determined with precision, actual results could differ significantly from these estimates. Changes in these estimates resulting from continuing changes in the economic environment will be reflected in the financial statements in future periods.
	Cash & Cash Equivalents
	Cash equivalents include short-term, highly liquid instruments, which consist of money market accounts. All cash and cash equivalents are maintained with major financial institutions in North America. Deposits with these financial institutions may exceed the amount of insurance provided on such deposits; however, these deposits typically may be redeemed upon demand and, therefore, bear minimal risk.
	Fair Value of Financial Instruments
	Fair value is an exit price that represents the amount that would be received from the sale of an asset or paid to transfer a liability in an orderly transaction between market participants. Accordingly, fair value is a market-based measurement that should be determined based on assumptions that market participants would use in pricing an asset or liability. The Company discloses the manner in which fair value is determined for assets and liabilities based on a three-tiered fair value hierarchy. The hierarchy ranks the quality and reliability of the information used to determine the fair values. The three levels of inputs described in the standard are:
	Level 1: Quoted prices in active markets for identical assets or liabilities.
	Level 2: Observable inputs, other than Level 1 prices, for the assets or liabilities, either directly or indirectly, 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. Under the Fair Value Option Subsections of Financial Accounting Standards Board (FASB) ASC Subtopic 825-10, Financial Instruments — Overall, the Company has the irrevocable option to report most financial assets and financial liabilities at fair value on an instrument by instrument basis, with changes in fair value reported in earnings each reporting period. As a result of electing this option, the Company recorded its Subordinated Notes, Senior Convertible Notes and Convertible Notes at fair value in order to measure these liabilities at amounts that more accurately reflect the economics of these instruments (see notes 6, 7 and 8).
	At December 31, 2014, no financial assets or liabilities were measured at fair value. At December 31, 2013, the Company’s Subordinated Notes, Senior Convertible Notes and Convertible Notes were valued utilizing Level 3 inputs.
	Concentration of Credit Risk
	Financial instruments, which potentially expose the Company to concentrations of credit risk, consist principally of accounts receivable. The Company’s customers consist primarily of insulation distributors, insulation contractors and select end-users located throughout the world. The Company performs ongoing credit evaluations of its customers’ financial condition and generally requires no collateral to secure accounts receivable. The Company maintains an allowance for doubtful accounts based on its assessment of the collectability of accounts receivable. The Company reviews the allowance for doubtful accounts quarterly. The Company has not experienced any meaningful non-payment or write-offs of accounts receivable. Accordingly, the allowance for doubtful accounts was zero at December 31, 2014 and 2013. The Company does not have any off-balance-sheet credit exposure related to its customers.
	For the year ended December 31, 2014, two customers represented 13% and 12% of total revenue, respectively. For the year ended December 31, 2013, two customers represented 15% and 11% of total revenue, respectively. For the year ended December 31, 2012, one customer represented 13% of total revenue.
	At December 31, 2014, the Company had three customers that accounted for 17%, 17% and 11% of accounts receivable, respectively. At December 31, 2013, the Company had three customers that accounted for 20%, 14% and 11% of accounts receivable, respectively.
	Inventories
	Inventory consists of finished products and raw materials. Inventories are carried at lower of cost, determined using the first-in, first-out (FIFO) method, or market. Cost includes materials, labor and manufacturing overhead. Manufacturing overhead is allocated to the costs of conversion based on normal capacity of the Company’s production facility. Abnormal freight, handling costs and material waste is expensed in the period it occurs.
	The Company periodically reviews its inventories and makes provisions as necessary for estimated excess, obsolete or damaged goods to ensure values approximate the lower of cost or market. The amount of any such provision is equal to the difference between the cost of inventory and the estimated market value based upon assumptions about future demand, selling prices and market conditions.
	Property, Plant and Equipment, Net
	Property, plant and equipment are stated at cost. Assets held under capital leases are stated at the lesser of the present value of future minimum payments, using the Company’s incremental borrowing rate, or the fair value of the property at the inception of the lease. Expenditures for maintenance and repairs are charged to expense as incurred, whereas major betterments are capitalized as additions to property, plant and equipment.
	Interest expense capitalization commences at the time a capital project begins construction and concludes when the project is completed. The Company has capitalized interest costs as part of the historical cost of constructing its manufacturing facilities. The Company capitalized less than $0.1 million, $0.1 million and $2.3 million in interest costs related to the build-out of the East Providence facility during the years ended December 31, 2014, 2013 and 2012, respectively.
	Depreciation on plant and equipment is calculated on the straight-line method over the estimated useful lives of the assets. Assets related to capital leases are amortized on a straight-line basis over the shorter of the lease term or estimated useful life of the asset.
	Assets utilized in the Company’s operations that are taken out of service with no future use are charged to cost of sales or operating expenses, depending on the department in which the asset was utilized. Write-offs of construction in progress are charged to operating expenses upon the determination of no future use.
	Other Assets
	Other assets primarily include long-term deposits and patent costs. Patent costs are amortized over the life of the patent.
	Impairment of Long-Lived Assets
	Long-lived assets are reviewed for impairment whenever events or changes in circumstances indicate that the carrying amount of an asset or asset group may not be recoverable. Recognition and measurement of a potential impairment is performed on assets grouped with other assets and liabilities at the lowest level where identifiable cash flows are largely independent of the cash flows of other assets and liabilities. Recoverability of assets to be held and used is measured by a comparison of the carrying amount of an asset or asset group to future undiscounted net cash flows expected to be generated by the asset or asset group. If the carrying amount of an asset or asset group exceeds its estimated undiscounted future cash flows, an impairment charge is recognized for the amount by which the carrying amount of the asset or asset group exceeds the fair value of the asset or asset group. Fair value is determined through various valuation techniques including discounted cash flows models, quoted market values and third-party independent appraisals, as considered necessary.
	Asset Retirement Obligations
	The Company records asset retirement obligations associated with its lease obligations and the retirement of tangible long-lived assets. The Company reviews legal obligations associated with the retirement of long-lived assets that result from contractual obligations or the acquisition, construction, development and/or normal use of the assets. If it is determined that a legal obligation exists, regardless of whether the obligation is conditional on a future event, the fair value of the liability for an asset retirement obligation is recognized in the period in which it is incurred, if a reasonable estimate of fair value can be made. An amount equal to the fair value of the liability is also recorded as a long-term asset that is depreciated over the estimated life of the asset. The difference between the gross expected future cash outflow and its present value is accreted over the life of the related lease as an operating expense.
	Deferred Revenue
	The Company records deferred revenue for product sales when (i) the Company has delivered products but other revenue recognition criteria have not been satisfied or (ii) payments have been received in advance of products being delivered.
	Redeemable Convertible Preferred Stock
	The Company’s Series A and Series B redeemable convertible preferred stock were classified as temporary equity and shown net of issuance costs at December 31, 2012. The Company recognized changes in the redemption value and adjusted the carrying amount of the redeemable convertible preferred stock to equal the redemption value at the end of each reporting period.
	As part of an amendment to its certificate of incorporation in 2013, the Company changed the terms of its redeemable convertible preferred stock such that the fair value of the shares immediately after the amendment was significantly different from the fair value of the shares immediately before the amendment. Accordingly, the Company accounted for the amendment as an extinguishment. The change in fair value upon extinguishment was recorded in additional paid-in capital (see note 13).
	Revenue Recognition
	The Company recognizes revenue from the sale of products and delivery of research and development services. Revenue is recognized when all of the following criteria are met: persuasive evidence of an arrangement exists, the price to the buyer is fixed or determinable, delivery has occurred or services have been provided, and collectability is reasonably assured.
	Product Revenue
	Product revenue is generally recognized upon transfer of title and risk of loss, which is generally upon shipment or delivery. The Company’s customary shipping terms are free on board (FOB) shipping point; however, some products are shipped using FOB destination shipping terms. Revenue associated with products shipped FOB destination is recognized when the products reach their specified destination. Products are typically delivered without significant post-sale obligations to customers.
	Sales returns are recorded based on historical sales and return information. Products that exhibit unusual sales return patterns due to quality or other manufacturing matters are specifically investigated and analyzed as part of the sales return accrual. The sales return accrual represents a reserve for products that may be returned due to quality concerns or authorized for destruction in the field. Sales return reserves are recorded at full original sales value. The Company rarely exchanges products from inventory for returned products. Sales return reserves were $0.1 million and $0.2 million at December 31, 2014 and 2013, respectively.
	Warranty
	The Company provides warranties for its products and records the estimated cost within cost of sales in the period that the related revenue is recorded. The Company’s standard warranty period extends one to two years from the date of sale, depending on the type of product purchased. The warranties provide that the Company’s products will be free from defects in material and workmanship, and will, under normal use, conform to the specifications for the product. For the years ended December 31, 2014, 2013 and 2012, warranty claims and charges have been insignificant.
	Research Services Revenue
	The Company performs research services under contracts with various government agencies and other institutions. The Company records revenue earned on research services contracts using the percentage-of-completion method in two ways: (1) for firm-fixed-price contracts, the Company accrues that portion of the total contract price that is allocable, on the basis of the Company’s estimates of costs incurred to date to total contract costs; (2) for cost-plus-fixed-fee contracts, the Company records revenue that is equal to total payroll cost incurred times a stated factor plus reimbursable expenses, to a stated upper limit. The primary cost is the labor effort expended in completing research and the only deliverable other than the labor hours expended is reporting of research results to the customer. Because the input measure of labor hours expended is also reflective of the output measure, it is a reliable means to measure the extent of progress towards completion. Revisions in cost estimates and fees during the course of the contract are reflected in the accounting period in which the facts that require the revisions become known.
	Provision is made for the entire amount of future estimated losses on contracts when the current contract estimate is a loss while claims for additional contract compensation are not reflected in the accounts until the year in which such claims are identifiable and receipt is probable. Contract costs and rates used to allocate overhead to contracts are subject to audit by the respective contracting government agency. Adjustments to revenue as a result of audit are recorded in the period they become known. Adjustments to revenue as a result of audit have been insignificant.
	Shipping and Handling Costs
	Shipping and handling costs are classified as a component of cost of revenue. Customer payments of shipping and handling costs are recorded as product revenue.
	Stock-based Compensation
	Stock-based compensation cost is measured at the grant date based on the fair value of the award. Expense is recognized on a straight-line basis over the requisite service period for all awards with service conditions. For performance-based awards, the grant date fair value is recognized as expense when the condition is probable of being achieved, and then on a graded basis over the requisite service period. The Company uses the Black-Scholes option-pricing model to determine the fair value of service-based option awards, which requires a number of complex and subjective assumptions including fair value of the underlying security, the expected volatility of the underlying security, a risk-free interest rate and the expected term of the option. The fair value of restricted stock and restricted stock unit grants is determined using the closing trading price of the Company’s common stock on the date of grant. For performance-based stock options issued during the year ended December 31, 2013, the Company used a Monte Carlo simulation model to estimate the number of options the Company expected to remain outstanding and eligible for vesting upon completion of an IPO. The simulation model was based on a number of complex assumptions including the terms of the performance condition, the expected value of the Company’s common stock at the time of its IPO, the expected time from the date of grant to its IPO, and expected volatility. The compensation cost of these performance-based options was determined by multiplying the Black-Scholes estimate of grant date fair value by the percentage of options expected to remain outstanding and eligible for vesting upon completion of the Company’s IPO.
	Research and Development
	Costs incurred in the research and development of the Company’s products are expensed as incurred and include compensation and related costs, services provided by third-party contractors, materials and supplies and are classified as research and development expenses. Research and development costs directly associated with research services revenue are classified as research services in cost of revenue.
	Earnings Per Share
	Prior to the IPO, net income (loss) per common share was calculated using the two-class method, which is an earnings allocation formula that determines net income (loss) per share for the holders of the Company’s common shares and participating securities. Prior to their conversion to common stock at the time of the Company’s IPO, the Company’s Series A preferred stock, Series B preferred stock, Series C preferred stock and Series C preferred stock warrants contained participation rights in any dividend to be paid by the Company to holders of its common shares and were deemed to be participating securities. Net income (loss) available to common shareholders and participating securities was allocated to each share on an as-if-converted basis as if all of the earnings for the period had been distributed. The participating securities did not include a contractual obligation to share in losses of the Company and were not included in the calculation of net loss per share in the periods that have a net loss.
	Diluted net income (loss) per share is computed using the more dilutive of (a) the two-class method, or (b) the if-converted method. The Company allocates net income (loss) first to preferred stockholders and holders of warrants to purchase preferred stock based on dividend rights and then to common stockholders, preferred stockholders and preferred warrant holders based on ownership interests. The weighted-average number of common shares included in the computation of diluted net income (loss) gives effect to all potentially dilutive common equivalent shares, including outstanding stock options and warrants. Common equivalent shares are excluded from the computation of diluted net income (loss) per share if their effect is antidilutive.
	Subsequent to the IPO, the Company calculates net income (loss) per common share based on the weighted-average number of common shares outstanding during each period. Potential common stock equivalents are determined using the treasury stock method. The weighted-average number of common shares included in the computation of diluted net income (loss) gives effect to all potentially dilutive common equivalent shares, including outstanding stock options, restricted stock units and warrants. Common equivalent shares are excluded from the computation of diluted net income (loss) per share if their effect is antidilutive.
	Income Taxes
	Income taxes are accounted for under the asset and liability method. Deferred tax assets and liabilities are recognized for the future tax consequences attributable to differences between the financial statement carrying amounts of existing assets and liabilities and their respective tax bases and operating loss and tax credit carryforwards. Deferred tax assets and liabilities are measured using enacted tax rates expected to apply to taxable income in the years in which those temporary differences are expected to be recovered or settled. The effect on deferred tax assets and liabilities of a change in tax rates is recognized in income in the period that includes the enactment date.
	The Company recognizes the effect of income tax positions only if those positions are more likely than not of being sustained. The Company accounts for uncertain tax positions using a recognition threshold and measurement attribute for the financial statement recognition and measurement of a tax position taken or expected to be taken in a tax return. Differences between tax positions taken in a tax return and amounts recognized in the financial statements are recorded as adjustments to income taxes payable or receivable, or adjustments to deferred taxes, or both. Changes in recognition or measurement are reflected in the period in which the change in judgment occurs. The Company recognizes penalties and interest related to uncertain tax positions, if any, as a component of income tax expense.
	Segments
	Operating segments are identified as components of an enterprise about which separate, discrete financial information is available for evaluation by the chief operating decision maker in making decisions on how to allocate resources and assess performance. The Company’s chief operating decision maker is the Chief Executive Officer. The Company’s chief operating decision maker reviews consolidated operating results to make decisions about allocating resources and assessing performance for the entire Company. The Company views its operations and manages its business as one operating segment.
	Information about the Company’s revenues, based on shipment destination or research services location, is presented in the following table:
	Year Ended December 31
	2014		2013		2012
	(In thousands)
Revenue:
U.S.	$	39,809	$	30,164	$	19,909
International		62,590		55,930		43,544
Total	$	102,399	$	86,094	$	63,453
Recently Issued Accounting Standards
In May 2014, the FASB issued Accounting Standards Update (ASU) 2014-09, Revenue from Contracts with Customers. The standard will eliminate the transaction- and industry-specific revenue recognition guidance under current U.S. GAAP and replace it with a principle based approach for determining revenue recognition. Public entities are required to apply the revenue recognition standard for annual reporting period beginning on or after December 15, 2016, including interim periods within that annual reporting period. Early application is not permitted. The Company has not yet selected a transition method and is evaluating the effect that the updated standard will have on its consolidated financial statements and related disclosures.
In August 2014, the FASB issued ASU 2014-15, Presentation of Financial Statements—Going Concern: Disclosure of Uncertainties about an Entity’s Ability to Continue as a Going Concern. The standard requires an entity’s management to evaluate whether there are conditions or events that raise substantial doubt about the entity’s ability to continue as a going concern within one year after the date that the financial statements are issued. Public entities are required to apply standards for annual reporting periods ending after December 15, 2016, and interim periods thereafter. Early application is permitted. The Company early adopted this standard and it did not have a material impact on its consolidated financial statements.
From time to time, new accounting pronouncements are issued by the FASB or other standard setting bodies and adopted by the Company as of the specified effective date. Unless otherwise discussed, the Company believes that the impact of recently issued standards that are not yet effective will not have a material impact on its financial position or results of operations upon adoption.

Inventories

Inventories	12 Months Ended
	Dec. 31, 2014
Inventory Disclosure [Abstract]
Inventories	(3) Inventories
	Inventories consist of the following:
		December 31
		2014		2013
		(In thousands)
	Raw material	$	4,052	$	2,813
	Finished goods		845		4,079
	Total	$	4,897	$	6,892

Property_Plant_and_Equipment_N

Property, Plant and Equipment, Net	12 Months Ended
	Dec. 31, 2014
Property, Plant and Equipment [Abstract]
Property, Plant and Equipment, Net	(4) Property, Plant and Equipment, Net
	Property, plant and equipment consist of the following:
		December 31
		2014			2013			Useful life
		(In thousands)
	Construction in progress	$	24,124		$	6,177		—
	Buildings		16,303			16,303		30 years
	Machinery and equipment		78,378			77,466		5 — 10 years
	Computer equipment and software		5,556			5,298		3 years
	Total		124,361			105,244
	Accumulated depreciation and amortization		(52,869	)		(43,221	)
	Property, plant and equipment, net	$	71,492		$	62,023
	Plant and equipment under capital leases consist of the following:
		December 31
		2014			2013
		(In thousands)
	Office equipment, at cost	$	118		$	113
	Vehicles, at cost		288			288
	Total capital leases		406			401
	Accumulated amortization		(265	)		(178	)
	Capital leases, net	$	141		$	223
	Depreciation expense was $10.1 million, $10.0 million and $9.6 million for the years ended December 31, 2014, 2013 and 2012, respectively. Amortization associated with assets under capital leases was less than $0.1 million, for each of the years ended December 31, 2014, 2013 and 2012.
	During the fourth quarter of 2012, certain equipment related to the Company’s manufacturing operations in the East Providence facility was taken out of service with no future alternative use. The remaining carrying value of the equipment of $2.5 million was charged to cost of sales.
	During the fourth quarter of 2013, the Company completed its 2014 operating plan, which contemplated alternatives to complete the build out of the East Providence facility. In conjunction with this process, the Company performed an assessment of on-hand, long-lead time equipment for the third production line and determined that certain costs and partially completed assets had no future alternative use. As a result, the Company recorded a write-off of construction in progress totaling $3.4 million, inclusive of $0.4 million of capitalized interest, for the year ended December 31, 2013. In addition, $2.3 million of equipment was identified as having an alternative use as spare parts for the existing production lines.
	Construction in progress totaling $24.1 million and $6.2 million, at December 31, 2014 and 2013, respectively, related primarily to the construction of a third production line and other capital projects at the East Providence facility.

Accrued_Expenses

Accrued Expenses	12 Months Ended
	Dec. 31, 2014
Payables and Accruals [Abstract]
Accrued Expenses	(5) Accrued Expenses
	Accrued expenses consist of the following:
		December 31
		2014		2013
		(In thousands)
	Employee compensation	$	4,851	$	3,926
	Professional fees		76		200
	Deferred rent		155		112
	Other accrued expenses		506		576
		$	5,588	$	4,814

Subordinated_Notes

Subordinated Notes	12 Months Ended
	Dec. 31, 2014
Brokers and Dealers [Abstract]
Subordinated Notes	(6) Subordinated Notes
	Subordinated Notes consists of the following:
			December 31
			2014			2013
			(In thousands)
	Subordinated Notes		$	—		$	17,306
	Current maturities of Subordinated Notes			—			(17,306	)
	Subordinated Notes, excluding current portion		$	—		$	—
	On December 29, 2010, the Company issued 12% Secured Subordinated Promissory Notes (the Subordinated Notes) for aggregate proceeds of $10.0 million with an original maturity date of December 29, 2015. The proceeds were used to fund the expansion of a second manufacturing line at the East Providence facility. The Subordinated Notes were collateralized by certain of the Company’s assets at the East Providence facility.
	All accrued interest on the Subordinated Notes was compounded semi-annually and added to principal on June 30th and December 31st of each year. Accrued and unpaid interest on the Subordinated Notes was due and payable at maturity. The Subordinated Notes were subject to certain financial covenants, which include a minimum tangible net worth calculation.
	In conjunction with the financing, the Company issued 181 detachable stock warrants to purchase the Company’s common stock at $8.25 per share. The warrants were immediately exercisable and set to expire on December 29, 2017. The Company determined that the warrants, which are subject to net share settlement, are equity classified. A portion of the debt proceeds totaling $2.2 million was allocated to the warrants based on the estimated fair value of the warrants using the Black Scholes option pricing model and the following assumptions: (i) risk free interest rate of 2.75%, (ii) life of 7.5 years, (iii) volatility of 50%, and (iv) expected dividend yield of zero. The debt discount was being amortized to interest expense utilizing the effective interest rate method over the term of the Subordinated Notes.
	The Company executed several amendments to the Subordinated Notes prior to September 26, 2012, in which the maturity date of the Subordinated Notes was extended to March 2, 2014 and the interest rate was increased to 12.75% and then to 15% per annum. The Company determined that these amendments were not substantial and represented modifications at the respective amendment dates.
	In connection with the issuances of the Convertible Notes on September 26, 2012, the terms of the Subordinated Notes were amended (i) to increase the interest rate to 20% per annum and (ii) to add a premium which provided each note holder with additional interest equal to the amount of interest that would have accrued to the date of the amendment if the notes had provided interest at a rate of 20% per annum on the original principal amount and from the initial date of issuance. The applicable premium of $1.4 million of additional interest was due upon maturity. In conjunction with the Company’s March 2013 financing (see note 7), the Company further amended the terms of the Subordinated Notes to extend the maturity date to September 30, 2014.
	The Company determined that the present value of the cash flow pursuant to the Subordinated Notes, as amended on September 26, 2012, was more than 10% greater than the remaining cash flow pursuant to the notes prior to the amendment. Accordingly, the Company accounted for the amendment as an extinguishment and reissuance of new Subordinated Notes. The Company recorded a $1.4 million loss associated with the extinguishment, which represents the difference between the carrying value of the original Subordinated Notes and the fair value of the new Subordinated Notes.
	Subsequent to the extinguishment and upon reissuance of the Subordinated Notes, the Company elected the fair value option for the Subordinated Notes and recorded the instrument at fair value. The fair value of the Subordinated Notes was determined by analysis of the amount to be paid on the notes at the occurrence of certain events in which the Subordinated Notes would be repaid to the noteholders in cash. The probability weighted discounted cash flow analysis utilized assumptions related to the probability of the occurrence of each of the various events and appropriate discount rates for each of the scenarios.
	At December 31, 2012 the valuations were calculated at an implied discount of approximately 31% and were weighted as follows: repayment prior to maturity on June 30, 2013, 65%; and repayment at maturity on September 30, 2014, 35%. There would not be a material difference if the weightings were increased or decreased by 10%. At December 31, 2012, the aggregate fair value of the Subordinated Notes was determined to be $13.5 million, with an aggregate unpaid principal balance totaling $13.1 million.
	At December 31, 2013 the valuations were calculated at an implied discount of approximately 20% and were weighted as follows: repayment prior to maturity on June 30, 2014, 20%; and repayment at maturity on September 30, 2014, 80%. There would not be a material difference if the weightings were increased or decreased by 10%. At December 31, 2013, the aggregate fair value of the Subordinated Notes was determined to be $17.3 million, with an aggregate unpaid principal balance totaling $15.9 million.
	Upon the completion of the Company’s IPO discussed in note 1, the Company used a portion of the net proceeds to repay $18.8 million of the original principal balance and accrued interest on the Subordinated Notes. As of June 20, 2014, all obligations under the Subordinated Notes had been paid in full.
	The following table presents a roll-forward of the fair value of Level 3 (significant unobservable inputs) Subordinated Notes for the years ended December 31, 2014, 2013 and 2012:
	Balance at December 31, 2011		$	—
	Transfer into Level 3 on September 26, 2012 (1)			12,435
	Change in fair value included in interest expense			1,100
	Balance at December 31, 2012			13,535
	Change in fair value included in interest expense			3,771
	Balance at December 31, 2013			17,306
	Change in fair value included in interest expense			1,543
	Repayment			(18,849	)
	Balance at December 31, 2014		$	—
	-1	Fair value option election was made on September 26, 2012.
	Interest expense, inclusive of changes in fair value and amortization of deferred financing costs, related to the Subordinated Notes for the years ended December 31, 2014, 2013 and 2012 was $1.5 million, $3.8 million and $2.9 million, respectively. Of these totals, $0.0 million, $0.0 million and $0.3 million have been capitalized as part of the costs of the second production line at the Company’s East Providence facility for the years ended December 31, 2014, 2013 and 2012, respectively (see note 10).

Senior_Convertible_Notes

Senior Convertible Notes	12 Months Ended
	Dec. 31, 2014
Equity [Abstract]
Senior Convertible Notes	(7) Senior Convertible Notes
	Senior Convertible Notes consist of the following:
		December 31,
		2014			2013
		(In thousands)
	March 2013 Investor Notes	$	—		$	24,482
	March 2013 Arcapita Notes		—			3,653
	Total Senior Convertible Notes	$	—		$	28,135
	Effective March 28, 2013, the Company entered into a Note and Warrant Purchase Agreement (March 2013 NPA) authorizing the issuance of $22.5 million of Senior Subordinated Convertible Notes (the March 2013 Investor Notes) and Senior Subordinated Arcapita Notes (the March 2013 Arcapita Notes) (collectively, the Senior Convertible Notes). At each closing under the March 2013 NPA, the Company issued warrants to purchase shares of a newly created Series C Preferred Stock (the Series C) based on the principal balance of Senior Convertible Notes issued to each purchaser. The Company determined that the Series C warrants, which were subject to net share settlement, were equity classified. Collectively, the warrants issued pursuant to the March 2013 NPA were exercisable for Series C shares equal to 85.7% of the then outstanding capital stock of the Company on a fully diluted basis. The warrants had an exercise price of $0.0001 per share, were immediately exercisable and an expiration date of March 28, 2023.
	The March 2013 Investor Notes accrued interest at a rate of 8% per annum compounded annually and added to principal on December 31st of each year. Accrued and unpaid interest was payable upon maturity or on the date of any prepayment. Accrued interest was payable in cash at the time of payment of principal or converted with the outstanding principal amount into common shares of the Company upon an IPO. Upon maturity, the Company was required to pay 1.375 times the aggregate principal amount and accrued interest on the March 2013 Investor Notes then outstanding or $33.8 million on March 28, 2016.
	The March 2013 Arcapita Notes were non-interest-bearing and were scheduled to mature on March 28, 2016. The March 2013 Arcapita Notes included an option to purchase one share of nonparticipating preferred stock, as defined, on the maturity date. This preferred stock was to be senior to all other series of the Company’s outstanding convertible preferred stock and have a liquidation preference totaling $5.2 million at maturity. If this option were to have been exercised, the Company would have created a new series of preferred stock.
	Pursuant to side letter agreements, in March and May 2013, holders of $7.5 million of Convertible Notes (see note 8) issued in November 2012 and January 2013 (the Initial Notes) exchanged their original principal balance for an equivalent principal amount of Senior Convertible Notes (the Exchanged Notes) and a pro-rata share of Series C warrants issued under the March 2013 NPA. The Company accounted for the warrant as a debt issuance cost and recorded an immediate charge for the fair value of the Series C warrants totaling $5.4 million in interest expense. Pursuant to the exchange, the holders of the Exchanged Notes received notes senior in preference to the Initial Notes and with an extended maturity date of March 28, 2016.
	Given that the terms of the Exchanged Notes were substantially different than the terms of the Initial Notes, the exchange was accounted for as an extinguishment of debt. Upon the exchange, the Company recognized a loss totaling $5.7 million representing the difference between (i) the fair value of the Exchanged Notes at reissuance and the fair value of Series C preferred stock warrants, and (ii) the carrying value of the Initial Notes. The Company elected to account for all of the issuances of its Senior Convertible Notes and various embedded derivatives in accordance with ASC Topic 825-10, Fair Value Option for Financial Liabilities, whereby the Company initially and subsequently measured this financial instrument in its entirety at fair value, with the changes in fair value recorded each reporting period in other interest expense (income).
	In March and May 2013, the Company issued an additional $15.0 million of Senior Convertible Notes. The noteholders received a pro-rata share of Series C warrants for their participation in the financing. The Company accounted for the warrant issuances as a debt issuance cost and recorded an immediate charge for the fair value of the Series C warrants totaling $10.7 million in interest expense (see note 10). In conjunction with the March 2013 NPA, the Company incurred $0.9 million of debt issuance costs, which was allocated between the debt and equity instruments related to the transaction. $0.6 million was allocated to the notes and recorded through interest expense, while the remaining $0.3 million was allocated to the warrants with an offset for additional paid-in capital.
	Net proceeds from the issuance of the Senior Convertible Notes were used (i) for investment in working capital to support revenue growth (ii) for capital expenditures to improve the efficiency and throughput of existing manufacturing assets and (iii) to settle all cash obligations under the Company’s cross license agreement with Cabot Corporation (see note 11).
	Upon the completion of the Company’s IPO discussed in note 1, the outstanding principal and accrued interest on the Senior Convertible Notes were marked to an aggregate fair value of $39.5 million and automatically converted into 3,591,604 shares of common stock equal to the unpaid principal amount of the Senior Convertible Notes and accrued interest as of June 18, 2014 divided by the Conversion Price, which was 62.5% of the initial public offering price of $11.00 per share. In addition, all outstanding Series C warrants were automatically net exercised, which, together with the then outstanding shares of Series C preferred stock, converted into 104,734 shares of common stock upon the closing of the Company’s IPO.
	Fair Value Option
	The following table presents the difference between the aggregate fair value and the aggregate unpaid principal balance of the Senior Convertible Notes recorded at fair value at December 31, 2013:
		Aggregate fair value			Aggregate unpaid			Fair value over
					principal balance			unpaid principal
								balance
		(In thousands)
	March 2013 Investor Notes	$	24,482		$	19,567		$	4,915
	March 2013 Arcapita Notes		3,653			2,980			673
	Total Senior Convertible Notes	$	28,135		$	22,547		$	5,588
	Fair Value Measurements
	The change in the fair values of the Senior Convertible Notes during the year ended December 31, 2014 and 2013 was determined by utilizing probability weighted discounted cash flow analyses, which took into consideration market and general economic events, as well as the Company’s financial results and other data available. These analyses determined the amount to be paid on the Senior Convertible Notes in either cash or shares at the occurrence of certain events in which the Senior Convertible Notes would be converted into shares of the Company’s common stock or would be repaid in cash. The probability weighted discounted cash flow analyses utilized assumptions related to the probability of the occurrence of each of the various events and appropriate discount rates for each of the scenarios as of December 31, 2013 are as follows:
	Potential exit	Estimated			Estimated
		exit date of			probability of
	scenario event	future event			future event
	IPO scenario 1		6/30/14			45	%
	IPO scenario 2		3/31/15			5	%
	Sale scenario 1		6/30/14			15	%
	Sale scenario 2		3/31/15			15	%
	Dissolution		9/30/14			5	%
	Private company		At maturity			15	%
	The above scenarios incorporated a weighted average implied discount rate of 41.7%.
	The final payment amount of the Senior Convertible Notes upon the closing of the Company’s IPO was determined to be $39.5 million.
	The following table presents a roll-forward of the fair value of Level 3 (significant unobservable inputs) Senior Convertible Notes for the years ended December 31, 2014, 2013 and 2012:
		March 2013			March 2013			Total Senior
		Investor			Arcapita			Convertible
		Notes			Notes			Notes
	Beginning balance as of December 31, 2012	$	—		$	—		$	—
	Issuances of senior convertible notes		13,435			1,536			14,971
	Fair value of notes exchanged for senior convertible notes		6,132			1,444			7,576
	Conversion of the Senior Convertible Notes		4,915			673			5,588
	Balance at December 31, 2013		24,482			3,653			28,135
	Change in fair value included in interest expense		9,803			1,570			11,373
	Conversion of Convertible Notes		(34,285	)		(5,223	)		(39,508	)
	Balance at December 31, 2014	$	—		$	—		$	—
	Changes in fair value of the Company’s Senior Convertible Notes for the years ended December 31, 2014 and 2013 was $11.4 million and $5.6 million, respectively. The charge for the fair value of the Series C warrants of $10.7 million was included in interest income (expense) for the year ended December 31, 2013.

Convertible_Notes

Convertible Notes	12 Months Ended
	Dec. 31, 2014
Text Block [Abstract]
Convertible Notes	(8) Convertible Notes
	Convertible Notes consist of the following:
		December 31
		2014			2013
		(In thousands)
	Investor Notes	$	—		$	87,479
	Arcapita Notes		—			4,395
	Total Convertible Notes		—			91,874
	Current maturities of convertible notes		—			(435	)
	Convertible Notes, excluding current portion	$	—		$	91,439
	Commencing in June 2011 and concluding in January 2013, the Company issued a total of $69.9 million of 8% subordinated convertible notes (the Investor Notes) to new and existing investors. The Investor Notes had original maturity dates of June 1, 2014, June 14, 2014 and December 6, 2014, depending on their date of issuance. Commencing in December 2011 and concluding in September 2012, the Company issued a total of $3.5 million of noninterest bearing convertible notes to an existing investor (the Arcapita Notes). The Arcapita Notes were originally set to mature on December 6, 2014. Net proceeds from the Investor Notes and Arcapita Notes (collectively, the Convertible Notes) were used to fund the completion of the Company’s second production line at the East Providence facility, to begin the construction of a third production line at the East Providence facility, and to fund the Company’s operating cash requirements.
	In conjunction with the execution of the March 2013 NPA (see note 7) on March 28, 2013, the holders of all but approximately $0.3 million of original principal amount of the Convertible Notes agreed to extend the original maturity date of their notes by two years. Given that the term of the Convertible Notes, as amended, differed substantially from the original term, the amendment was accounted for as an extinguishment of debt. On March 28, 2013, the Company recognized a gain on extinguishment totaling $8.9 million which represents the difference between (i) the fair value of the Convertible Notes at reissuance, and (ii) the fair value of the Convertible Notes just prior to the amendment.
	The Investor Notes earned interest at a rate of 8% per annum compounded annually and to be added to principal on December 31st of each year. Accrued and unpaid interest was payable at maturity or on the date of any prepayment. Accrued interest was payable in cash at the time of payment of principal or converted with the outstanding principal amount into common shares of the Company upon an IPO. Upon maturity, the Company was to be required to pay 1.375 times the aggregate principal amount and accrued interest on the Investor Notes then outstanding. Aggregate principal amounts due on December 6, 2014, June 1, 2016 and December 6, 2016 are $0.5 million, $61.0 million and $63.5 million, respectively.
	The Arcapita Notes were non-interest-bearing and due on December 6, 2016. The Arcapita Notes included an option to purchase one share of nonparticipating preferred stock, as defined, on the maturity date. This preferred stock was to be senior to all other series of the Company’s outstanding convertible preferred stock and to have a liquidation preference totaling $6.8 million. If this option were to have been exercised, the Company would have created a new series of preferred stock.
	The Company elected to record the Convertible Notes at fair value upon issuance. The aggregate fair value of the notes was $91.9 million at December 31, 2013.
	Upon the closing of the Company’s IPO discussed in note 1, the outstanding principal and accrued interest on the Convertible Notes were marked to an aggregate fair value of $129.0 million and automatically converted into 11,727,430 shares of common stock equal to the unpaid principal amount of the Convertible Notes and accrued interest divided by the Conversion Price, which was 62.5% of the initial public offering price of $11.00 per share.
	Fair Value Option
	The following table presents the difference between the aggregate fair value and the aggregate unpaid principal balance of the Convertible Notes recorded at fair value at December 31, 2013:
		Aggregate fair value			Aggregate unpaid			Fair value over
					principal balance			unpaid principal
								balance
		(In thousands)
	Investor Notes	$	87,479		$	68,264		$	19,215
	Arcapita Notes		4,395			3,479			916
	Total Convertible Notes	$	91,874		$	71,743		$	20,131
	Fair Value Measurements
	The change in the fair values of the Senior Convertible Notes during the year ended December 31, 2014 and 2013 was determined by utilizing probability weighted discounted cash flow analyses, which took into consideration market and general economic events, as well as the Company’s financial results and other data available. These analyses determined the amount to be paid on the Senior Convertible Notes in either cash or shares at the occurrence of certain events in which the Senior Convertible Notes would be converted into shares of the Company’s common stock or would be repaid in cash. The probability weighted discounted cash flow analyses utilized assumptions related to the probability of the occurrence of each of the various events and appropriate discount rates for each of the scenarios as of December 31, 2013 were as follows:
		December 31, 2013
	Potential exit scenario event	Estimated			Estimated
		exit date of			probability
		future event			of future
					event
	IPO scenario 1		6/30/14			45	%
	IPO scenario 2		3/31/15			5	%
	Sale scenario 1		6/30/14			15	%
	Sale scenario 2		3/31/15			15	%
	Dissolution		9/30/14			5	%
	Private company		At maturity			15	%
	The above scenarios incorporated weighted average implied discount rates of 31% and 40% at December 31, 2012 and 2013, respectively.
	Given that the valuation of the Convertible Notes utilized several unobservable inputs, the Company determined that the valuation of the Convertible Notes was a Level 3 valuation.
	The final payment amount of the Convertible Notes upon the closing of the Company’s IPO was determined to be $129.0 million.
	The following table presents a roll-forward of the fair value of Level 3 (significant unobservable inputs) Convertible Notes for the years ended December 31, 2014, 2013 and 2012:
		Investor			Arcapita			Total
		Notes			Notes			Convertible
								Notes
	Balance at December 31, 2011	$	50,118		$	585		$	50,703
	Issuances of convertible notes		21,991			2,900			24,891
	Change in fair value included in interest expense		18,811			683			19,494
	Balance at December 31, 2012		90,920			4,168			95,088
	Issuances of convertible notes		2,090			1,440			3,530
	Fair value of notes exchanged for senior convertible notes		(5,971	)		(1,282	)		(7,253	)
	Gain on extinguishment of convertible notes		(8,498	)		(400	)		(8,898	)
	Change in fair value included in interest expense		8,938			469			9,407
	Balance at December 31, 2013		87,479			4,395			91,874
	Change in fair value included in interest expense		35,036			2,092			37,128
	Conversion of Convertible Notes		(122,515	)		(6,487	)		(129,002	)
	Balance at December 31, 2014	$	—		$	—		$	—
	The charge recognized as a result of the change in the fair value of the Company’s Convertible Notes was $37.1 million, $9.4 million and $17.6 million for the years ended December 31, 2014, 2013 and 2012, respectively (see note 10).

Revolving_Line_of_Credit

Revolving Line of Credit	12 Months Ended
	Dec. 31, 2014
Debt Disclosure [Abstract]
Revolving Line of Credit	(9) Revolving Line of Credit
	In March 2011, the Company entered into a $10.0 million revolving credit facility with Silicon Valley Bank. This facility has been amended at various dates through 2014.
	On September 3, 2014, the Company amended and restated the loan and security agreement to extend the maturity date of the facility to August 31, 2016 and increase the maximum amount the Company is permitted to borrow, subject to continued covenant compliance and borrowing base requirements, from $10 million to $20 million. At the Company’s election, the interest rate applicable to borrowings under the amended revolving credit facility may be based on the prime rate or the LIBOR. Prime rate-based rates vary from prime rate plus 0.75% per annum to prime rate plus 1.75% per annum, while LIBOR-based rates vary from LIBOR plus 3.75% per annum to LIBOR plus 4.25% per annum. In addition, the Company is required to pay a monthly unused revolving line facility fee of 0.5% per annum of the average unused portion of the revolving credit facility. The amended revolving credit facility is secured by a first priority security interest in all assets of the Company, including those at the East Providence facility, except for certain exclusions.
	At December 31, 2014 and 2013, the Company had drawn $0.0 million and $1.0 million, respectively, on the revolving credit facility. The Company also had outstanding letters of credit backed by the revolving credit facility of $1.4 million and $1.2 million at December 31, 2014 and 2013, respectively, which reduce the funds otherwise available to the Company. Based on the available borrowing base, the effective amount available to the Company at December 31, 2014 was $12.4 million after giving respect to the $1.4 million of outstanding letters of credit. Under the amended revolving credit facility, the Company is required to comply with financial covenants relating to, among other items, minimum Adjusted EBITDA, maximum unfinanced capital expenditures and other non-financial covenants. At December 31, 2014, the Company was in compliance with all such financial covenants.

Interest_Expense

Interest Expense	12 Months Ended
	Dec. 31, 2014
Banking and Thrift, Interest [Abstract]
Interest Expense	(10) Interest Expense
	Interest expense consists of the following:
			Year ended December 31
			2014		2013		2012
	Changes in fair value:
	Subordinated notes		$	1,543	$	3,771	$	1,100
	Senior convertible notes			11,373		5,588		—
	Convertible notes, net of capitalization(1)			37,095		9,337		17,578
	Issuance of Series C preferred stock warrants in connection with senior convertible notes			—		10,677		—
	Subordinated notes interest, net of capitalization(2)			—		—		822
	Amortization of deferred financing costs for subordinated notes			—		—		636
	Debt closing costs			47		585		425
	Imputed interest on Cabot obligation			—		391		1,018
	Other interest			223		250		211
			$	50,281	$	30,599	$	21,790
	-1	The charge recognized as a result of the change in the fair value of the Company’s Convertible Notes is presented net of capitalized interest expense of $0.1 million, $0.1 million and $1.9 million for the years ended December 31, 2014, 2013 and 2012, respectively.
	-2	Interest expense recognized from the Company’s Subordinated Notes is presented net of capitalized interest expense of $0.0 million, $0.0 million and $0.3 million for the years ended December 31, 2014, 2013 and 2012, respectively.
	Debt closing costs and commitment fees, consisting primarily of legal and related fees, associated with the issuance or modification of the Company’s Subordinated Notes, Senior Convertible Notes, Convertible Notes, and revolving credit facility are amortized over the term of the debt instrument and recorded in interest expense.
	Capitalized interest relates primarily to costs associated with the Company’s third production line and significant improvements for the second production line at the East Providence facility.

Other_Longterm_Liabilities

Other Long-term Liabilities	12 Months Ended
	Dec. 31, 2014
Other Liabilities Disclosure [Abstract]
Other Long-term Liabilities	(11) Other Long-term Liabilities
	Other long-term liabilities consist of the following:
		December 31
		2014			2013
		(In thousands)
	Asset retirement obligations (ARO)	$	1,018		$	1,009
	Other		62			112
			1,080			1,121
	Current maturities of other long-term liabilities		(50	)		(50	)
	Other long-term liabilities, less current maturities	$	1,030		$	1,071
	The Company has asset retirement obligations (ARO) arising from requirements to perform certain asset retirement activities upon the termination of its Northborough, Massachusetts facility lease and upon disposal of certain machinery and equipment. The liability was initially measured at fair value and subsequently adjusted for accretion expense and changes in the amount or timing of the estimated cash flows. The corresponding asset retirement costs are capitalized as part of the carrying amount of the related long-lived asset and depreciated over the asset’s remaining useful life.
	A summary of ARO activity consists of the following:
		Year Ended December 31
		2014			2013
		(In thousands)
	Balance at beginning of period	$	1,009		$	1,000
	Accretion of discount expense		40			34
	Settlement costs		(31	)		(25	)
	Balance at end of period	$	1,018		$	1,009
	In August 2013, the Company extended its Northborough, Massachusetts facility lease to August 2016. As a result, the Company classified the ARO as long term at December 31, 2014 and 2013.
	On April 1, 2006, the Company and Cabot Corporation entered into a Cross License Agreement to license certain intellectual property rights. Such licenses will expire on the last day of the life of each issued patent or patent applications and acquired patents licensed thereunder. On September 21, 2007, the Cross License Agreement was amended to modify the consideration payable to Cabot by the Company to $38.0 million in cash in quarterly installments over a seven-year period. The Company adjusted its obligation to Cabot to reflect a revised net present value of the consideration payable to Cabot of $19.3 million. The discount of $18.7 million was amortized to interest expense over the term of the payment schedule.
	The consideration provided to Cabot was for the value of the licensed patents and patent applications, the avoidance of potential claims on prior use of Cabot issued patents and related costs. $1.0 million of the total consideration was allocated to the fair market value of the patents and patent applications licensed from Cabot, $0.5 million was allocated to the fair market value of the patents and patent applications licensed to Cabot, and the remainder was allocated to general and administrative expenses.
	The remaining consideration payable to Cabot under the Cross License Agreement was paid in full during 2013.

Commitments_and_Contingencies

Commitments and Contingencies	12 Months Ended
	Dec. 31, 2014
Commitments and Contingencies Disclosure [Abstract]
Commitments and Contingencies	(12) Commitments and Contingencies
	Capital Leases
	The Company has entered into certain capital leases for computer equipment and vehicles. The leases are payable in monthly installments and expire at various dates through 2017. The recorded balance of capital lease obligations as of December 31, 2014 and 2013 was $0.2 million and $0.2 million, respectively. Future minimum payments under capital leases at December 31, 2014 are as follows:
	Year	Capital Lease
		Obligations
		(In thousands)
	2015	$	87
	2016		64
	2017		30
	Total		181
	Less portion representing interest		(16	)
	Present value of future minimum payments		165
	Current maturities of capital lease payments		(76	)
	Capital leases, excluding current portion	$	89
	Operating Leases
	The Company leases facilities and office equipment under operating leases expiring at various dates through 2021. Under these agreements, the Company is obligated to pay annual rentals, as noted below, plus real estate taxes, and certain operating expenses. Some operating leases contain rent escalation clauses whereby the rent payments increase over the term of the lease. In such cases, rent expense is recognized on a straight-line basis over the lease term.
	Future minimum lease payments under operating leases at December 31, 2014 are as follows:
	Year	Operating
		Leases
		(In thousands)
	2015	$	1,126
	2016		1,133
	2017		600
	2018		601
	2019		170
	Thereafter		34
	Total minimum lease payments	$	3,664
	The Company incurred rent expense under all operating leases of approximately $1.2 million in each of the years ended December 31, 2014, 2013 and 2012.
	Letters of Credit
	Pursuant to the terms of its Northborough, Massachusetts facility lease, the Company has been required to provide the lessor with letters of credit securing certain obligations. In addition, the Company has been required to provide certain customers with letters of credit securing obligations under commercial contracts.
	The Company had letters of credit outstanding for $1.4 million and $1.2 million at December 31, 2014 and 2013, respectively. These letters of credit are secured by the Company’s revolving credit facility (see note 9).
	Litigation
	The Company is, from time to time, a party to litigation that arises in the normal course of its business operations. The Company is not presently a party to any litigation for which it believes a loss is probable requiring an amount to be accrued or a possible loss contingency requiring disclosure.

Conversion_of_Redeemable_Conve

Conversion of Redeemable Convertible Preferred Stock	12 Months Ended
	Dec. 31, 2014
Text Block [Abstract]
Conversion of Redeemable Convertible Preferred Stock	(13) Conversion of Redeemable Convertible Preferred Stock
	The fair value of the Company’s Series A Redeemable Convertible Preferred Stock (Series A) and Series B Redeemable Convertible Preferred Stock (Series B) was estimated using the probability-weighted expected return method, or PWERM, which considers the value of preferred and common stock based upon analysis of the future values for equity assuming various future outcomes, including initial public offerings, merger or sale, dissolutions or continued operation as a private company. Accordingly, share value is based upon the probability-weighted present value of expected future net cash flows, considering each of the possible future events, as well as the rights and preferences of each share class. As such, the Company’s redeemable convertible preferred stock was valued utilizing Level 3 inputs.
	In conjunction with the execution of the March 2013 NPA, the redemption and dividend rights of the Company’s issued and outstanding Series B and Series A were eliminated and the liquidation preference of the Series B and Series A was reduced to an aggregate of $4.0 million. During March 2013, the Company recorded decreases in the redemption value of the Company’s Series B and Series A shares of $30.0 million and $56.1 million, respectively, reflecting the changes in the fair market value of the Series B and Series A shares at the time of the March 2013 Financing. Given that the release of the redemption rights substantially impacted the fair value of the Series B and Series A, the elimination of the rights was accounted for as an extinguishment of the securities. As a result, the Company recorded a gain on extinguishment of Series B and Series A of approximately $86.2 million recorded in additional paid-in capital available to common stockholders. Additionally, the remaining value of the Series B and Series A of $1.1 million subsequent to extinguishment was recorded in additional paid-in capital upon reclassification from temporary to permanent equity.
	At the time of the March 2013 Financing, the Company’s board of directors established the price per share of the Company’s Series B and Series A shares at $0.20 and $0.15 per share, respectively, as determined by the PWERM method. This valuation took into consideration market and general economic events as well as the Company’s financial results and other data available at that time. In addition, the board reaffirmed that the continued use of market multiples based on comparable companies was appropriate. At the time of the March 2013 financing, the various scenarios, excluding dissolution, resulted in equity fair values ranging from $20.0 million to $215.0 million. At the time of the March 2013 financing, the valuations were weighted as follows: IPO, 40%; sale of the Company/assets, 45%; dissolution, 10%; and remain private, 5%. The estimated fair value of one share of common and preferred stock was estimated under each of the four scenarios and the associated probabilities to arrive at a probability weighted value per share.
	Upon the closing of the Company’s IPO discussed in note 1, the outstanding shares of Series A, Series B and Series C converted into 115,982 shares of common stock.

Stockholders_Equity_Deficit

Stockholders' Equity (Deficit)	12 Months Ended
	Dec. 31, 2014
Equity [Abstract]
Stockholders' Equity (Deficit)	(14) Stockholders’ Equity (Deficit)
	On June 18, 2014, the Company completed an IPO of 7,500,000 shares of its common stock at a public offering price of $11.00 per share. The Company received net proceeds of $74.7 million after deducting underwriting discounts and commissions of $4.3 million and other offering expenses of approximately $3.5 million. Upon the closing of the offering, all of the Company’s then-outstanding (i) Series C warrants to purchase Series C preferred stock, were subject to an automatic net cashless exercise, (ii) convertible preferred stock (including the shares of Series C preferred stock issued upon the automatic net cashless exercise of Series C warrants) automatically converted into 115,982 shares of common stock, and (iii) Convertible Notes (see note 8) and Senior Convertible Notes (see note 7) automatically converted into 15,319,034 shares of common stock.
	At December 31, 2014, the Company was authorized to issue 130,000,000 shares of stock, of which 125,000,000 shares were designated as common stock and 5,000,000 shares were designated as preferred stock.

Employee_Benefit_Plan

Employee Benefit Plan	12 Months Ended
	Dec. 31, 2014
Postemployment Benefits [Abstract]
Employee Benefit Plan	(15) Employee Benefit Plan
	The Company sponsors the Aspen Aerogels, Inc. 401(k) Plan. Under the terms of the plan, the Company’s employees may contribute a percentage of their pretax earnings. The Company has not provided matching contributions nor has it made any contributions to the plan.

Employee_Stock_Ownership_Plans

Employee Stock Ownership Plans	12 Months Ended
	Dec. 31, 2014
Disclosure of Compensation Related Costs, Share-based Payments [Abstract]
Employee Stock Ownership Plans	(16) Employee Stock Ownership Plans
	Effective June 12, 2014, upon the pricing of the IPO, the Company adopted the 2014 Employee, Director and Consultant Equity Incentive Plan (the 2014 Equity Plan). Under the 2014 Equity Plan, the Company may grant incentive stock options, non-qualified stock options, restricted stock and other stock-based awards. Stock options under the plan are to be granted with an exercise price not less than the fair market value of the Company’s common stock at the date of grant.
	Upon the completion of the IPO, the Company issued 61,816 shares of restricted common stock vesting over a period of one year with an aggregate value at issuance of approximately $0.7 million to its non-employee directors under the 2014 Equity Plan. In September 2014, the Company issued 318,517 restricted stock units (RSUs) and non-qualified stock options (NSOs) to purchase 934,018 shares of common stock to employees under the 2014 Equity Plan. The RSUs and NSOs will vest over a four year period for certain executive employees and over a three year period for other employees.
	Stock-based compensation is included in cost of sales or operating expenses, as applicable, and consists of the following:
		Year Ended
		December 31
		2014			2013			2012
		(In thousands)
	Cost of product revenue	$	1,121		$	496		$	221
	Research and development expenses		1,046			267			112
	Sales and marketing expenses		1,390			727			384
	General and administrative expenses		5,224			2,936			937
	Total stock-based compensation	$	8,781		$	4,426		$	1,654
	During the years ended December 31, 2014, 2013 and 2012, the Company issued stock options with a 10-year term that contain service conditions. Generally, these stock options vest and become exercisable over a service period of three to four years from the date of grant.
	During the year ended December 31, 2013, the Company also issued stock options with a 10-year term that contain both a performance condition and a service condition. The performance-based options were to vest and become exercisable only in the event of the completion of the Company’s IPO and then over a service period of three to four years from the date of grant. The number of shares subject to the performance-based options was to be reduced, as necessary, such that each holder’s total option holdings would equal a target percentage of the Company’s common stock deemed outstanding immediately prior to the IPO. The aggregate target percentage for all holders of performance-based options issued during the year ended December 31, 2013 was 15.384%. If the number of shares subject to these options was insufficient to achieve the target percentage in an IPO, the Company was under no obligation to grant additional options to the holder.
	At December 31, 2014, 1,244,781 shares of common stock were reserved for stock-based awards granted under the 2014 Equity Plan. In addition, 96,369 shares of common stock are reserved for stock-based awards granted under the Company’s 2001 Equity Plan, which was replaced by the 2014 Equity Plan. Any cancellations or forfeitures of these awards will become available for grant under the 2014 Equity Plan. At December 31, 2014, there were 3,750,420 shares available for grant under the 2014 Equity Plan.
	Valuation and Amortization Method
	Prior to the IPO, the Board of Directors had historically determined the fair value of the Company’s common stock based on the market approach and the income approach to estimate the enterprise value of the business under various liquidity event scenarios, including an IPO by the Company and the sale of the Company. To support the valuations, the Company utilized a probability-weighted expected return under those various liquidity scenarios, public guideline companies, management cash flow projections and other assumptions to derive the enterprise value of the business. The Company then derived the estimated fair value of each class of stock, taking into consideration the rights and preferences of each instrument based on a probability-weighted expected return.
	The fair value of each stock option was estimated as of the date of grant using the Black-Scholes option pricing model. Key inputs into this formula included expected term, expected volatility, expected dividend yield and the risk-free rate. Each assumption is set forth and discussed below.
	For the performance-based stock options issued during the year ended December 31, 2013, the Company used a Monte Carlo simulation model to estimate the number of options expected to remain outstanding and eligible for vesting upon completion of the Company’s IPO. The simulation model was based on a number of complex assumptions including the terms of the performance condition, the value of our common stock at the time of the Company’s IPO, the expected time from the date of grant to the Company’s IPO and expected volatility. The number of options expected to remain outstanding and eligible for vesting upon completion of the Company’s IPO was estimated to be 96.8% and 97.4% of the options granted at August 7, 2013 and December 20, 2013, respectively. The fair value of each performance-based stock option was determined by multiplying the Black-Scholes estimate of grant date fair value by the percentage of options expected to remain outstanding and eligible for vesting upon completion of the Company’s IPO.
	For stock options with a service condition, the fair value is amortized on a straight-line basis over the requisite service period of the options, which is generally a three- to four-year vesting period from the date of grant. For the performance-based stock options issued during the year ended December 31, 2013, a portion of the fair value was recognized as expense when the IPO performance condition was achieved and the remainder over the requisite service period, which is generally a three- to four-year vesting period from the date of grant.
	Expected Term
	The expected term represents the period that the Company’s stock-based awards are expected to be outstanding. The Company uses the simplified method as prescribed by FASB ASC 718 to calculate the expected term for options granted, as it does not have sufficient historical exercise data to provide a reasonable basis upon which to estimate the expected term.
	Expected Volatility
	Due to the Company’s limited historical data, the estimated volatility reflects the incorporation of the historical volatility of comparable companies with publicly available share prices. In 2014, 2013 and 2012, the expected volatility is based on the weighted average volatility of up to seven companies within various industries that the Company believes are similar to its own.
	Expected Dividend
	The Company uses an expected dividend yield of zero. The Company does not intend to pay cash dividends on its common stock in the foreseeable future, nor has it paid dividends on its common stock in the past.
	Risk-free Interest Rate
	The risk-free interest rate is based on U.S. Treasury zero-coupon issues with a remaining term equal to the expected life assumed at the date of grant.
	Estimated Forfeitures
	Forfeitures are required to be estimated at the time of grant and revised, if necessary, in subsequent periods, if actual forfeitures differ from those estimates. Forfeitures are estimated based on voluntary termination behavior as well as analysis of actual option forfeitures. Accordingly, share-based compensation expense has been reduced by an estimated annual forfeiture rate for the years ended December 31, 2014, 2013 and 2012.
	Assumptions Utilized
	The following information relates to the fair value of the option awards estimated by use of the Black-Scholes option pricing model:
		Year Ended December 31
		2014			2013			2012
	Weighted average assumptions:
	Expected term (in years)		6.17			5.47			6.02
	Expected volatility		50.09	%		48.99	%		58.06	%
	Risk free rate		1.94	%		1.69	%		0.95	%
	Expected dividend yield		0	%		0	%		0	%
	Weighted average fair value:
	Grant-date fair value of options granted	$	5.37		$	0.12		$	5.6
	Grant-date fair value of options vested	$	97.31		$	0.18		$	2.3
	Aggregate intrinsic value of options exercised	$	4,816.50		$	—		$	—
	Modifications
	On August 7, 2013, the Company canceled substantially all options held by Company employees and granted two sets of new options to these employees. Each recipient received a grant of options containing service-based vesting conditions and a second grant of options containing both service and performance-based vesting conditions. The performance-based vesting was met upon the successful completion of the IPO of the Company’s common stock.
	On December 20, 2013, the Company canceled all options held by members of the Company’s board of directors and granted two sets of new options to these directors. Each recipient received a grant of options containing service-based vesting conditions and a second grant of options containing both service and performance-based vesting conditions. The performance-based vesting was met upon the successful completion of the IPO of the Company’s common stock.
	As a result of the cancellation and concurrent grant of options, the Company accounted for these transactions as modifications in determining the stock-based compensation expense to be recognized over the remaining service period. The total incremental compensation expense resulting from the modification was $7.8 million and $1.0 million for the two grant dates, respectively. The incremental compensation expense associated with the service based awards of $2.0 million will be recognized over the remaining service period of the new options. The Company recorded $0.4 million and $6.4 million associated with the service and performance-based awards, respectively, during the year ended December 31, 2014 as a result of the IPO in June 2014.
	Outstanding Options
	The following table summarizes information about stock options outstanding:
		Number of			Weighted			Weighted			Weighted		Aggregate
		Shares			Average			Average			Average		Intrinsic
					Grant Date			Exercise			Remaining		Value
					Fair Value			Price			Contractual
					Per Share			Per Share			Term
											(Years)
		($ in thousands, except share and per share data)
	Options outstanding at December 31, 2013		97,183		$	97.36		$	92.25			9.63
	Granted		934,018		$	5.37		$	10.78
	Forfeited		(4,660	)	$	20.14		$	21.45
	Exercised		(31	)	$	95.92		$	74.23				$	4,816.50
	Options outstanding at December 31, 2014		1,026,510		$	14.01		$	18.44			9.59	$	—
	Exercisable at December 31, 2014		63,731		$	97.31		$	82.1			8.59	$	—
	Expected to vest at December 31, 2014		827,504		$	8.82		$	13.46			9.66	$	—
As of December 31, 2014, total unrecognized compensation cost related to nonvested options granted under the Plan was $6.8 million. The unrecognized compensation cost consisted of $5.9 million relating to service-based awards and $0.9 million to performance-based awards. The unrecognized compensation cost for the service-based options and performance-based awards is expected to be recognized over a weighted average period of 2.76 and 1.60 years, respectively.
Restricted Stock Awards and Restricted Stock Units
The Company values restricted stock awards and RSUs based on the closing trading value of our shares on the date of grant. Information related to grants of RSUs during 2014 is as follows:
	Restricted			Weighted
	Stock
	Units			Average
				Grant Date
				Fair Value
Balance at December 31, 2013		—		$	—
Granted		318,517			10.78
Vested		—			—
Forfeited		(3,877	)		10.78
Balance outstanding at December 31, 2014		314,640		$	10.78
Restricted stock awards granted during 2014 are considered issued and outstanding common stock and are excluded from the table above.
As of December 31, 2014, total unrecognized compensation cost related to restricted stock awards and RSUs granted under the 2014 Equity Plan was $0.3 million and $2.6 million and is expected to be recognized over a weighted average period of 0.44 and 3.11 years, respectively.

Net_Income_Loss_Per_Share

Net Income (Loss) Per Share	12 Months Ended
	Dec. 31, 2014
Earnings Per Share [Abstract]
Net Income (Loss) Per Share	(17) Net Income (Loss) Per Share
	The computation of basic and diluted net income (loss) per share attributable to common stockholders consists of the following:
			Year ended December 31
			2014			2013			2012
			(In thousands, except share and per share data)
	Numerator:
	Net income (loss)		$	(66,324	)	$	(47,611	)	$	(56,142	)
	Deemed dividends on participating preferred stock (inclusive of issuance costs and changes in redemption value, including extinguishment):
	Series B			—			29,622			3,772
	Series A			—			55,543			43,429
	Total preferred stock deemed dividends			—			85,165			47,201
	Earnings attributable to participating convertible preferred stock shareholders and Series C preferred stock warrant holders			—			(36,216	)		—
	Net income (loss) attributable to common stockholders		$	(66,324	)	$	1,338		$	(8,941	)
	Denominator:
	Weighted average shares outstanding, basic			12,349,456			3,137			3,136
	Effect of warrants to purchase common stock			—			122			—
	Weighted average shares outstanding, diluted			12,349,456			3,259			3,136
	Net income (loss) attributable to common stockholders per common share, basic		$	(5.37	)	$	426.52		$	(2,851.08	)
	Effect of warrants to purchase common stock			—			(15.96	)		—
	Net income (loss) attributable to common stockholders per common share, diluted		$	(5.37	)	$	410.56		$	(2,851.08	)
	Potential dilutive common shares that were excluded from the computation of diluted net income (loss) attributable to common stockholders per common share because they were anti-dilutive consist of the following:
			Year ended December 31
			2014			2013			2012
	Series B (a)			—			—			1,941
	Series A (a)			—			—			6,407
	Common stock options			1,026,510			21,846			2,749
	Restricted common stock units			314,640			—			—
	Common stock warrants			131			—			137
	Total			1,341,281			21,846			11,234
	(a)	Common stock equivalent reflecting conversion of preferred shares.
	As of December 31, 2014, there was no dilutive impact of the common stock options, restricted common stock units and common stock warrants. All other potentially dilutive instruments were converted into shares of common stock upon the closing of the Company’s IPO on June 18, 2014.
	As of December 31, 2013 the Company had outstanding $28.1 million of Senior Convertible Notes and $91.9 million of Convertible Notes, which were convertible into common stock upon the occurrence of an IPO at prices that are not determinable until the occurrence of those future events (see notes 7 and 8), and 97,183 outstanding common stock options, which were exercisable into common stock upon the occurrence of an IPO and the performance of service during the vesting period (see note 16). As of December 31, 2012 the Company had $95.1 million of outstanding Convertible Notes which were convertible into common stock upon the occurrence of an IPO at prices that were not determinable until the occurrence of those future events (see note 8). Because the necessary conditions for the conversion of these convertible notes and common stock options had not been satisfied during the respective years ended, the Company has excluded these convertible notes and performance options from the table above and the calculation of diluted net (loss) income per share for the respective years ended.

Income_Taxes

Income Taxes	12 Months Ended
	Dec. 31, 2014
Income Tax Disclosure [Abstract]
Income Taxes	(18) Income Taxes
	The Company incurred net operating losses and recorded a full valuation allowance against net deferred assets for all periods presented. Accordingly, the Company has not recorded a provision for federal or state income taxes.
	The reconciliation between the U.S. statutory income tax rate and the Company’s effective rate consists of the following:
		Year Ended December 31
		2014			2013			2012
	U.S. federal income tax statutory rate		35	%		35	%		35	%
	Debt and warrant fair value adjustments		(26	%)		(16	%)		(12	%)
	Changes in valuation allowance for deferred tax assets		1	%		6	%		(22	%)
	Write down of losses not previously benefitted		(11	%)		(22	%)		0	%
	Other		1	%		(3	%)		(1	%)
	Effective tax rate		—			—			—
	The tax effects of temporary differences between financial statement and tax accounting that gave rise to significant portions of the Company’s deferred tax assets and deferred tax liabilities at December 31, 2014 and 2013 are presented below:
		December 31
		2014			2013
		(In thousands)
	Deferred tax assets:
	Net operating loss carryforwards	$	61,457		$	67,503
	Transaction related costs		—			1,494
	Stock-based compensation		4,479			2,460
	Tax credit carryforwards		379			393
	Reserves and accruals		282			896
	Intangible assets and amortization		384			—
	Other		5			127
	Total gross deferred tax assets		66,986			72,873
	Deferred tax liabilities:
	Depreciation	$	(3,311	)	$	(2,717	)
	Total deferred tax liabilities		(3,311	)		(2,717	)
	Total deferred tax assets and liabilities		63,675			70,156
	Valuation allowance		(63,675	)		(70,156	)
	Net deferred tax asset	$	—		$	—
	The net change in the valuation allowance for the year ended December 31, 2014, was a decrease of $6.5 million. The Company has recorded a full valuation allowance against its deferred tax assets due to the uncertainty associated with the utilization of the net operating loss carryforwards and other future deductible items. In assessing the realizability of deferred tax assets, the Company considers all available evidence, historical and prospective, with greater weight given to historical evidence, in determining whether it is more likely than not that some portion or all of the deferred tax assets will not be realized. The ultimate realization of the Company’s deferred tax assets generally is dependent upon generation of future taxable income.
	At December 31, 2014, the Company has $161.4 million of net operating losses available to offset future federal income, if any, and which expire on various dates through December 31, 2034.
	For the year ended December 31, 2010, the Company performed an analysis pursuant to Section 382 of the Internal Revenue Code of 1986, as amended (the Internal Revenue Code) as well as similar state provisions, in order to determine whether any limitations might exist on the utilization of net operating losses and other tax attributes. Based on this analysis, the Company has determined that it is more likely than not that an ownership change occurred on June 10, 2008, resulting in an annual limitation on the use of its net operating losses and other tax attributes as of such date. The Company also determined that built-in gains of $29.5 million existed at the date of the ownership change. Built-in gains increase the limitation under the Internal Revenue Code Section 382 to the extent triggered during the five year period subsequent to the date of change, which period ended in June 2013.
	For the year ended December 31, 2013, the Company performed an analysis pursuant to Internal Revenue Code Section 382, as well as similar state provisions, in order to determine whether any limitations might exist on the utilization of net operating losses and other tax attributes. Based on this analysis, the Company has determined that no ownership changes occurred as a result of the March 2013 financing (see note 7) and, as a result, there was no annual limitation on the use of its net operating losses and other tax attributes as of such date.
	For the year ended December 31, 2014, the Company performed an analysis pursuant to Internal Revenue Code Section 382, as well as similar state provisions, in order to determine whether any limitations might exist on the utilization of net operating losses and other tax attributes. Based on this analysis, the Company has determined that an ownership change occurred as a result of the June 2014 IPO, resulting in an annual limitation on the use of its net operating losses and other tax attributes as of such date. Net operating losses of $113.2 million were determined to be available. The Company also determined that built-in gains of $42.0 million existed at the date of the ownership change. Built-in gains increase the limitation under the Internal Revenue Code to the extent triggered during the five-year period subsequent to the date of change. Absent the disposition of certain built-in gain assets within the five-year period subsequent to the change in ownership, the entire $42.0 million of net operating losses will expire in June 2019.
	At December 31, 2014, the Company has $106.0 million of apportioned net operating losses available to offset future state taxable income, if any, and which begin to expire at various dates between 2015 and 2034.
	For each of the years ended December 31, 2014, 2013 and 2012, the Company did not have any material unrecognized tax benefits and thus no interest and penalties related to unrecognized tax benefits were recorded. In addition, the Company does not expect that the amount of unrecognized tax benefits will change significantly within the next twelve months.
	The Company files a federal income tax return in the United States and income tax returns in various state and foreign jurisdictions. All tax years are open for examination by the taxing authorities for both federal and state purposes.

Related_Party_Transactions

Related Party Transactions	12 Months Ended
	Dec. 31, 2014
Related Party Transactions [Abstract]
Related Party Transactions	(19) Related Party Transactions
	The Company had the following transactions with related parties:
	During the years ended 2014, 2013 and 2012, the Company sold aerogel products to one stockholder totaling $4.7 million, to three stockholders totaling $8.9 million and to four stockholders totaling $10.7 million, respectively. The Company had trade receivables with these stockholders of $2.0 million and $2.0 million at December 31, 2014 and 2013, respectively.
	Prior to the closing of the Company’s IPO in June 2014, several stockholders of the Company held Subordinated Notes, Senior Convertible Notes and Convertible Notes (see notes 6, 7 and 8).

Subsequent_Events

Subsequent Events	12 Months Ended
	Dec. 31, 2014
Subsequent Events [Abstract]
Subsequent Events	(20) Subsequent Events
	The Company has evaluated subsequent events through March 13, 2015, the date of issuance of the consolidated financial statements for the year ended December 31, 2014.

Quarterly_Results_of_Operation

Quarterly Results of Operations	12 Months Ended
	Dec. 31, 2014
Quarterly Financial Information Disclosure [Abstract]
Quarterly Results of Operations	QUARTERLY RESULTS OF OPERATIONS
	(in thousands, except per share data)
	(unaudited)
		Three Months Ended
		March 31,			June 30,			Sept 30,			Dec 31,
	2014
	Total revenue	$	22,363		$	26,615		$	25,437		$	27,984
	Gross profit		3,346			3,425			5,072			5,236
	Income (loss) from operations		(2,898	)		(8,121	)		(2,365	)		(2,658	)
	Net income (loss)		(19,049	)		(42,148	)		(2,412	)		(2,714	)
	Net income (loss) attributable to common stockholders		(19,049	)		(42,148	)		(2,412	)		(2,714	)
	Net income (loss) attributable to common stockholders per common share - basic	$	(6,065.89	)	$	(13.88	)	$	(0.10	)	$	(0.12	)
	Net income (loss) attributable to common stockholders per common share - diluted	$	(6,065.89	)	$	(13.88	)	$	(0.10	)	$	(0.12	)
	2013
	Total revenue	$	17,005		$	22,978		$	21,880		$	24,232
	Gross profit		38			3,531			3,580			3,583
	Income (loss) from operations		(6,025	)		(2,638	)		(4,665	)		(6,644	)
	Net income (loss)		1,027			(18,984	)		(8,038	)		(16,950	)
	Net income (loss) attributable to common stockholders		20,251			(18,984	)		(12,703	)		(16,950	)
	Net income (loss) attributable to common stockholders per common share - basic	$	6,455.53		$	(6,051.64	)	$	(4,049.41	)	$	(5,403.25	)
	Net income (loss) attributable to common stockholders per common share - diluted	$	6,455.21		$	(6,051.64	)	$	(4,049.41	)	$	(5,403.25	)
	The reported results for 2014 included interest expense comprised of changes in fair value of the subordinated notes, senior convertible notes, convertible notes and debt closing costs and other interest expense of: $16.2 million in the first quarter, $34.0 million in the second quarter, less than $0.1 million in the third quarter and $0.1 million in the fourth quarter. The changes in fair value of the respective notes were calculated based on the expected conversion amounts of the notes into equity at the closing of our initial public offering.
	The reported results for 2013 included interest expense comprised of changes in fair value of the subordinated notes, senior convertible notes, convertible notes, debt closing costs, other interest expense, loss on exchange of convertible notes, gain on the extinguishment of convertible notes and costs associated with a postponed public offering of: $7.1 million of income in the first quarter, $16.3 million in the second quarter, $8.0 million in the third quarter and $10.3 million in the fourth quarter. The changes in fair value of the respective notes were calculated based on the expected conversion amounts of the notes into equity at the closing of our initial public offering.

Valuation_and_Qualifying_Accou

Valuation and Qualifying Accounts

12 Months Ended

Dec. 31, 2014

Valuation and Qualifying Accounts [Abstract]

Valuation and Qualifying Accounts

Schedule II

VALUATION AND QUALIFYING ACCOUNTS

(in millions)

Description

Balance

Charges

Deductions to

Charges to

Balance

at

to

Allowances

(Deductions

at

Costs

for

from)

End of

Beginning

and

Uncollectible

Other

Year

of Year

Expenses (a)

Accounts (b)

Accounts (c)

Year Ended December 31, 2014:

Allowances for uncollectible accounts and sales returns and allowances

$

209

—

—

(89

)

$

120

Year Ended December 31, 2013:

Allowances for uncollectible accounts and sales returns and allowances

$

421

—

—

(212

)

$

209

Year Ended December 31, 2012:

Allowances for uncollectible accounts and sales returns and allowances

$

282

—

(103

)

242

$

421

(a)

Represents allowances for uncollectible accounts established through selling, general and administrative expenses.

(b)

Represents actual write-offs of uncollectible accounts.

(c)

Represents net change in allowances for sales returns, recorded as contra-revenue.

Description_of_Business_Polici

Description of Business (Policies)	12 Months Ended
	Dec. 31, 2014
Accounting Policies [Abstract]
Nature of Business	Nature of Business
	Aspen Aerogels, Inc. (the Company) is an energy technology company that designs, develops and manufactures innovative, high-performance aerogel insulation. The Company also conducts research and development related to aerogel technology supported by funding from several agencies of the U.S. government and other institutions in the form of research and development contracts.
	The Company maintains its corporate offices in Northborough, Massachusetts. The Company has two wholly owned subsidiaries: Aspen Aerogels Rhode Island, LLC and Aspen Aerogels Germany, GmbH.
	On June 18, 2014, the Company completed an initial public offering (IPO) of 7,500,000 shares of its common stock at a public offering price of $11.00 per share. The Company received net proceeds of $74.7 million after deducting underwriting discounts and commissions of $4.3 million and offering expenses of approximately $3.5 million. Upon the closing of the offering, all of the Company’s then-outstanding (i) warrants to purchase Series C preferred stock, (the “Series C warrants”) were subject to an automatic net cashless exercise, (ii) convertible preferred stock (including the shares of Series C preferred stock issued upon the automatic net cashless exercise of Series C warrants) automatically converted into 115,982 shares of common stock, and (iii) Convertible Notes (see note 8) and Senior Convertible Notes (see note 7) automatically converted into 15,319,034 shares of common stock.
	Prior to the closing of the offering, the Company completed a 1-for-824.7412544 reverse stock split of its common stock. All common shares and related per share amounts in the financial statements and notes have been adjusted retroactively to reflect the reverse stock split.
Principles of Consolidation	Principles of Consolidation
	The accompanying consolidated financial statements, which have been prepared in accordance with generally accepted accounting principles in the United States of America, include the accounts of the Company and its wholly owned subsidiaries. All intercompany balances and transactions have been eliminated in consolidation.
Reclassification	Reclassification
	The December 31, 2013 balance sheet reflects a $0.2 million reclassification of the Company’s sales returns reserve from a component of accrued expenses to a reduction of accounts receivable, a $0.1 million reclassification of other assets to prepaid expenses and other current assets and a reclassification of $0.1 million of other long term liabilities to other current liabilities to conform to the current period’s presentation. The change has no impact on the results of operations.
Use of Estimates	Use of Estimates
	The preparation of the consolidated financial statements requires the Company to make a number of estimates and assumptions that affect the reported amounts of assets and liabilities at the date of the consolidated financial statements and the reported amounts of revenues and expenses during the reporting period. Significant items subject to such estimates and assumptions include allowances for doubtful accounts, inventory valuation, the carrying amount of property and equipment, fair value of debt and capital stock, stock-based compensation and deferred income taxes. The Company evaluates its estimates and assumptions on an on-going basis using historical experience and other factors, including the current economic environment, which it believes to be reasonable under the circumstances. Management adjusts such estimates and assumptions when facts and circumstances dictate. Illiquid credit markets, volatile equity markets and declines in business investment increase the uncertainty inherent in such estimates and assumptions. As future events and their effects cannot be determined with precision, actual results could differ significantly from these estimates. Changes in these estimates resulting from continuing changes in the economic environment will be reflected in the financial statements in future periods.
Cash & Cash Equivalents	Cash & Cash Equivalents
	Cash equivalents include short-term, highly liquid instruments, which consist of money market accounts. All cash and cash equivalents are maintained with major financial institutions in North America. Deposits with these financial institutions may exceed the amount of insurance provided on such deposits; however, these deposits typically may be redeemed upon demand and, therefore, bear minimal risk.
Fair Value of Financial Instruments	Fair Value of Financial Instruments
	Fair value is an exit price that represents the amount that would be received from the sale of an asset or paid to transfer a liability in an orderly transaction between market participants. Accordingly, fair value is a market-based measurement that should be determined based on assumptions that market participants would use in pricing an asset or liability. The Company discloses the manner in which fair value is determined for assets and liabilities based on a three-tiered fair value hierarchy. The hierarchy ranks the quality and reliability of the information used to determine the fair values. The three levels of inputs described in the standard are:
	Level 1: Quoted prices in active markets for identical assets or liabilities.
	Level 2: Observable inputs, other than Level 1 prices, for the assets or liabilities, either directly or indirectly, 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. Under the Fair Value Option Subsections of Financial Accounting Standards Board (FASB) ASC Subtopic 825-10, Financial Instruments — Overall, the Company has the irrevocable option to report most financial assets and financial liabilities at fair value on an instrument by instrument basis, with changes in fair value reported in earnings each reporting period. As a result of electing this option, the Company recorded its Subordinated Notes, Senior Convertible Notes and Convertible Notes at fair value in order to measure these liabilities at amounts that more accurately reflect the economics of these instruments (see notes 6, 7 and 8).
	At December 31, 2014, no financial assets or liabilities were measured at fair value. At December 31, 2013, the Company’s Subordinated Notes, Senior Convertible Notes and Convertible Notes were valued utilizing Level 3 inputs.
Concentration of Credit Risk	Concentration of Credit Risk
	Financial instruments, which potentially expose the Company to concentrations of credit risk, consist principally of accounts receivable. The Company’s customers consist primarily of insulation distributors, insulation contractors and select end-users located throughout the world. The Company performs ongoing credit evaluations of its customers’ financial condition and generally requires no collateral to secure accounts receivable. The Company maintains an allowance for doubtful accounts based on its assessment of the collectability of accounts receivable. The Company reviews the allowance for doubtful accounts quarterly. The Company has not experienced any meaningful non-payment or write-offs of accounts receivable. Accordingly, the allowance for doubtful accounts was zero at December 31, 2014 and 2013. The Company does not have any off-balance-sheet credit exposure related to its customers.
	For the year ended December 31, 2014, two customers represented 13% and 12% of total revenue, respectively. For the year ended December 31, 2013, two customers represented 15% and 11% of total revenue, respectively. For the year ended December 31, 2012, one customer represented 13% of total revenue.
	At December 31, 2014, the Company had three customers that accounted for 17%, 17% and 11% of accounts receivable, respectively. At December 31, 2013, the Company had three customers that accounted for 20%, 14% and 11% of accounts receivable, respectively.
Inventories	Inventories
	Inventory consists of finished products and raw materials. Inventories are carried at lower of cost, determined using the first-in, first-out (FIFO) method, or market. Cost includes materials, labor and manufacturing overhead. Manufacturing overhead is allocated to the costs of conversion based on normal capacity of the Company’s production facility. Abnormal freight, handling costs and material waste is expensed in the period it occurs.
	The Company periodically reviews its inventories and makes provisions as necessary for estimated excess, obsolete or damaged goods to ensure values approximate the lower of cost or market. The amount of any such provision is equal to the difference between the cost of inventory and the estimated market value based upon assumptions about future demand, selling prices and market conditions.
Property, Plant and Equipment, Net	Property, Plant and Equipment, Net
	Property, plant and equipment are stated at cost. Assets held under capital leases are stated at the lesser of the present value of future minimum payments, using the Company’s incremental borrowing rate, or the fair value of the property at the inception of the lease. Expenditures for maintenance and repairs are charged to expense as incurred, whereas major betterments are capitalized as additions to property, plant and equipment.
	Interest expense capitalization commences at the time a capital project begins construction and concludes when the project is completed. The Company has capitalized interest costs as part of the historical cost of constructing its manufacturing facilities. The Company capitalized less than $0.1 million, $0.1 million and $2.3 million in interest costs related to the build-out of the East Providence facility during the years ended December 31, 2014, 2013 and 2012, respectively.
	Depreciation on plant and equipment is calculated on the straight-line method over the estimated useful lives of the assets. Assets related to capital leases are amortized on a straight-line basis over the shorter of the lease term or estimated useful life of the asset.
	Assets utilized in the Company’s operations that are taken out of service with no future use are charged to cost of sales or operating expenses, depending on the department in which the asset was utilized. Write-offs of construction in progress are charged to operating expenses upon the determination of no future use.
Other Assets	Other Assets
	Other assets primarily include long-term deposits and patent costs. Patent costs are amortized over the life of the patent.
Impairment of Long-Lived Assets	Impairment of Long-Lived Assets
	Long-lived assets are reviewed for impairment whenever events or changes in circumstances indicate that the carrying amount of an asset or asset group may not be recoverable. Recognition and measurement of a potential impairment is performed on assets grouped with other assets and liabilities at the lowest level where identifiable cash flows are largely independent of the cash flows of other assets and liabilities. Recoverability of assets to be held and used is measured by a comparison of the carrying amount of an asset or asset group to future undiscounted net cash flows expected to be generated by the asset or asset group. If the carrying amount of an asset or asset group exceeds its estimated undiscounted future cash flows, an impairment charge is recognized for the amount by which the carrying amount of the asset or asset group exceeds the fair value of the asset or asset group. Fair value is determined through various valuation techniques including discounted cash flows models, quoted market values and third-party independent appraisals, as considered necessary.
Asset Retirement Obligations	Asset Retirement Obligations
	The Company records asset retirement obligations associated with its lease obligations and the retirement of tangible long-lived assets. The Company reviews legal obligations associated with the retirement of long-lived assets that result from contractual obligations or the acquisition, construction, development and/or normal use of the assets. If it is determined that a legal obligation exists, regardless of whether the obligation is conditional on a future event, the fair value of the liability for an asset retirement obligation is recognized in the period in which it is incurred, if a reasonable estimate of fair value can be made. An amount equal to the fair value of the liability is also recorded as a long-term asset that is depreciated over the estimated life of the asset. The difference between the gross expected future cash outflow and its present value is accreted over the life of the related lease as an operating expense.
Deferred Revenue	Deferred Revenue
	The Company records deferred revenue for product sales when (i) the Company has delivered products but other revenue recognition criteria have not been satisfied or (ii) payments have been received in advance of products being delivered.
Redeemable Convertible Preferred Stock	Redeemable Convertible Preferred Stock
	The Company’s Series A and Series B redeemable convertible preferred stock were classified as temporary equity and shown net of issuance costs at December 31, 2012. The Company recognized changes in the redemption value and adjusted the carrying amount of the redeemable convertible preferred stock to equal the redemption value at the end of each reporting period.
	As part of an amendment to its certificate of incorporation in 2013, the Company changed the terms of its redeemable convertible preferred stock such that the fair value of the shares immediately after the amendment was significantly different from the fair value of the shares immediately before the amendment. Accordingly, the Company accounted for the amendment as an extinguishment. The change in fair value upon extinguishment was recorded in additional paid-in capital (see note 13).
Revenue Recognition	Revenue Recognition
	The Company recognizes revenue from the sale of products and delivery of research and development services. Revenue is recognized when all of the following criteria are met: persuasive evidence of an arrangement exists, the price to the buyer is fixed or determinable, delivery has occurred or services have been provided, and collectability is reasonably assured.
Product Revenue	Product Revenue
	Product revenue is generally recognized upon transfer of title and risk of loss, which is generally upon shipment or delivery. The Company’s customary shipping terms are free on board (FOB) shipping point; however, some products are shipped using FOB destination shipping terms. Revenue associated with products shipped FOB destination is recognized when the products reach their specified destination. Products are typically delivered without significant post-sale obligations to customers.
	Sales returns are recorded based on historical sales and return information. Products that exhibit unusual sales return patterns due to quality or other manufacturing matters are specifically investigated and analyzed as part of the sales return accrual. The sales return accrual represents a reserve for products that may be returned due to quality concerns or authorized for destruction in the field. Sales return reserves are recorded at full original sales value. The Company rarely exchanges products from inventory for returned products. Sales return reserves were $0.1 million and $0.2 million at December 31, 2014 and 2013, respectively.
Warranty	The Company provides warranties for its products and records the estimated cost within cost of sales in the period that the related revenue is recorded. The Company’s standard warranty period extends one to two years from the date of sale, depending on the type of product purchased. The warranties provide that the Company’s products will be free from defects in material and workmanship, and will, under normal use, conform to the specifications for the product. For the years ended December 31, 2014, 2013 and 2012, warranty claims and charges have been insignificant.
Research Services Revenue	Research Services Revenue
	The Company performs research services under contracts with various government agencies and other institutions. The Company records revenue earned on research services contracts using the percentage-of-completion method in two ways: (1) for firm-fixed-price contracts, the Company accrues that portion of the total contract price that is allocable, on the basis of the Company’s estimates of costs incurred to date to total contract costs; (2) for cost-plus-fixed-fee contracts, the Company records revenue that is equal to total payroll cost incurred times a stated factor plus reimbursable expenses, to a stated upper limit. The primary cost is the labor effort expended in completing research and the only deliverable other than the labor hours expended is reporting of research results to the customer. Because the input measure of labor hours expended is also reflective of the output measure, it is a reliable means to measure the extent of progress towards completion. Revisions in cost estimates and fees during the course of the contract are reflected in the accounting period in which the facts that require the revisions become known.
	Provision is made for the entire amount of future estimated losses on contracts when the current contract estimate is a loss while claims for additional contract compensation are not reflected in the accounts until the year in which such claims are identifiable and receipt is probable. Contract costs and rates used to allocate overhead to contracts are subject to audit by the respective contracting government agency. Adjustments to revenue as a result of audit are recorded in the period they become known. Adjustments to revenue as a result of audit have been insignificant.
Shipping and Handling Costs	Shipping and Handling Costs
	Shipping and handling costs are classified as a component of cost of revenue. Customer payments of shipping and handling costs are recorded as product revenue.
Stock-based Compensation	Stock-based Compensation
	Stock-based compensation cost is measured at the grant date based on the fair value of the award. Expense is recognized on a straight-line basis over the requisite service period for all awards with service conditions. For performance-based awards, the grant date fair value is recognized as expense when the condition is probable of being achieved, and then on a graded basis over the requisite service period. The Company uses the Black-Scholes option-pricing model to determine the fair value of service-based option awards, which requires a number of complex and subjective assumptions including fair value of the underlying security, the expected volatility of the underlying security, a risk-free interest rate and the expected term of the option. The fair value of restricted stock and restricted stock unit grants is determined using the closing trading price of the Company’s common stock on the date of grant. For performance-based stock options issued during the year ended December 31, 2013, the Company used a Monte Carlo simulation model to estimate the number of options the Company expected to remain outstanding and eligible for vesting upon completion of an IPO. The simulation model was based on a number of complex assumptions including the terms of the performance condition, the expected value of the Company’s common stock at the time of its IPO, the expected time from the date of grant to its IPO, and expected volatility. The compensation cost of these performance-based options was determined by multiplying the Black-Scholes estimate of grant date fair value by the percentage of options expected to remain outstanding and eligible for vesting upon completion of the Company’s IPO.
Research and Development	Research and Development
	Costs incurred in the research and development of the Company’s products are expensed as incurred and include compensation and related costs, services provided by third-party contractors, materials and supplies and are classified as research and development expenses. Research and development costs directly associated with research services revenue are classified as research services in cost of revenue.
Earnings Per Share	Earnings Per Share
	Prior to the IPO, net income (loss) per common share was calculated using the two-class method, which is an earnings allocation formula that determines net income (loss) per share for the holders of the Company’s common shares and participating securities. Prior to their conversion to common stock at the time of the Company’s IPO, the Company’s Series A preferred stock, Series B preferred stock, Series C preferred stock and Series C preferred stock warrants contained participation rights in any dividend to be paid by the Company to holders of its common shares and were deemed to be participating securities. Net income (loss) available to common shareholders and participating securities was allocated to each share on an as-if-converted basis as if all of the earnings for the period had been distributed. The participating securities did not include a contractual obligation to share in losses of the Company and were not included in the calculation of net loss per share in the periods that have a net loss.
	Diluted net income (loss) per share is computed using the more dilutive of (a) the two-class method, or (b) the if-converted method. The Company allocates net income (loss) first to preferred stockholders and holders of warrants to purchase preferred stock based on dividend rights and then to common stockholders, preferred stockholders and preferred warrant holders based on ownership interests. The weighted-average number of common shares included in the computation of diluted net income (loss) gives effect to all potentially dilutive common equivalent shares, including outstanding stock options and warrants. Common equivalent shares are excluded from the computation of diluted net income (loss) per share if their effect is antidilutive.
	Subsequent to the IPO, the Company calculates net income (loss) per common share based on the weighted-average number of common shares outstanding during each period. Potential common stock equivalents are determined using the treasury stock method. The weighted-average number of common shares included in the computation of diluted net income (loss) gives effect to all potentially dilutive common equivalent shares, including outstanding stock options, restricted stock units and warrants. Common equivalent shares are excluded from the computation of diluted net income (loss) per share if their effect is antidilutive.
Income Taxes	Income Taxes
	Income taxes are accounted for under the asset and liability method. Deferred tax assets and liabilities are recognized for the future tax consequences attributable to differences between the financial statement carrying amounts of existing assets and liabilities and their respective tax bases and operating loss and tax credit carryforwards. Deferred tax assets and liabilities are measured using enacted tax rates expected to apply to taxable income in the years in which those temporary differences are expected to be recovered or settled. The effect on deferred tax assets and liabilities of a change in tax rates is recognized in income in the period that includes the enactment date.
	The Company recognizes the effect of income tax positions only if those positions are more likely than not of being sustained. The Company accounts for uncertain tax positions using a recognition threshold and measurement attribute for the financial statement recognition and measurement of a tax position taken or expected to be taken in a tax return. Differences between tax positions taken in a tax return and amounts recognized in the financial statements are recorded as adjustments to income taxes payable or receivable, or adjustments to deferred taxes, or both. Changes in recognition or measurement are reflected in the period in which the change in judgment occurs. The Company recognizes penalties and interest related to uncertain tax positions, if any, as a component of income tax expense.
Segments	Segments
	Operating segments are identified as components of an enterprise about which separate, discrete financial information is available for evaluation by the chief operating decision maker in making decisions on how to allocate resources and assess performance. The Company’s chief operating decision maker is the Chief Executive Officer. The Company’s chief operating decision maker reviews consolidated operating results to make decisions about allocating resources and assessing performance for the entire Company. The Company views its operations and manages its business as one operating segment.
	Information about the Company’s revenues, based on shipment destination or research services location, is presented in the following table:
		Year Ended December 31
		2014		2013		2012
		(In thousands)
	Revenue:
	U.S.	$	39,809	$	30,164	$	19,909
	International		62,590		55,930		43,544
	Total	$	102,399	$	86,094	$	63,453
Recently Issued Accounting Standards	Recently Issued Accounting Standards
	In May 2014, the FASB issued Accounting Standards Update (ASU) 2014-09, Revenue from Contracts with Customers. The standard will eliminate the transaction- and industry-specific revenue recognition guidance under current U.S. GAAP and replace it with a principle based approach for determining revenue recognition. Public entities are required to apply the revenue recognition standard for annual reporting period beginning on or after December 15, 2016, including interim periods within that annual reporting period. Early application is not permitted. The Company has not yet selected a transition method and is evaluating the effect that the updated standard will have on its consolidated financial statements and related disclosures.
	In August 2014, the FASB issued ASU 2014-15, Presentation of Financial Statements—Going Concern: Disclosure of Uncertainties about an Entity’s Ability to Continue as a Going Concern. The standard requires an entity’s management to evaluate whether there are conditions or events that raise substantial doubt about the entity’s ability to continue as a going concern within one year after the date that the financial statements are issued. Public entities are required to apply standards for annual reporting periods ending after December 15, 2016, and interim periods thereafter. Early application is permitted. The Company early adopted this standard and it did not have a material impact on its consolidated financial statements.
	From time to time, new accounting pronouncements are issued by the FASB or other standard setting bodies and adopted by the Company as of the specified effective date. Unless otherwise discussed, the Company believes that the impact of recently issued standards that are not yet effective will not have a material impact on its financial position or results of operations upon adoption.

Summary_of_Basis_of_Presentati1

Summary of Basis of Presentation and Significant Accounting Policies (Tables)	12 Months Ended
	Dec. 31, 2014
Accounting Policies [Abstract]
Schedule of Revenues, Based on Shipment Destination or Services Location	Information about the Company’s revenues, based on shipment destination or research services location, is presented in the following table:
		Year Ended December 31
		2014		2013		2012
		(In thousands)
	Revenue:
	U.S.	$	39,809	$	30,164	$	19,909
	International		62,590		55,930		43,544
	Total	$	102,399	$	86,094	$	63,453

Inventories_Tables

Inventories (Tables)	12 Months Ended
	Dec. 31, 2014
Inventory Disclosure [Abstract]
Schedule of Inventories	Inventories consist of the following:
		December 31
		2014		2013
		(In thousands)
	Raw material	$	4,052	$	2,813
	Finished goods		845		4,079
	Total	$	4,897	$	6,892

Property_Plant_and_Equipment_N1

Property, Plant and Equipment, Net (Tables)	12 Months Ended
	Dec. 31, 2014
Property, Plant and Equipment [Abstract]
Summary of Property, Plant and Equipment	Property, plant and equipment consist of the following:
		December 31
		2014			2013			Useful life
		(In thousands)
	Construction in progress	$	24,124		$	6,177		—
	Buildings		16,303			16,303		30 years
	Machinery and equipment		78,378			77,466		5 — 10 years
	Computer equipment and software		5,556			5,298		3 years
	Total		124,361			105,244
	Accumulated depreciation and amortization		(52,869	)		(43,221	)
	Property, plant and equipment, net	$	71,492		$	62,023
Schedule of Plant and Equipment Under Capital Leases	Plant and equipment under capital leases consist of the following:
		December 31
		2014			2013
		(In thousands)
	Office equipment, at cost	$	118		$	113
	Vehicles, at cost		288			288
	Total capital leases		406			401
	Accumulated amortization		(265	)		(178	)
	Capital leases, net	$	141		$	223

Accrued_Expenses_Tables

Accrued Expenses (Tables)	12 Months Ended
	Dec. 31, 2014
Payables and Accruals [Abstract]
Schedule of Accrued Expenses	Accrued expenses consist of the following:
		December 31
		2014		2013
		(In thousands)
	Employee compensation	$	4,851	$	3,926
	Professional fees		76		200
	Deferred rent		155		112
	Other accrued expenses		506		576
		$	5,588	$	4,814

Subordinated_Notes_Tables

Subordinated Notes (Tables)	12 Months Ended
	Dec. 31, 2014
Schedule of Subordinated Notes	Subordinated Notes consists of the following:
			December 31
			2014			2013
			(In thousands)
	Subordinated Notes		$	—		$	17,306
	Current maturities of Subordinated Notes			—			(17,306	)
	Subordinated Notes, excluding current portion		$	—		$	—
Schedule of Roll-forward of Fair Value of Level 3 (Significant Unobservable Inputs) Convertible Notes	The following table presents a roll-forward of the fair value of Level 3 (significant unobservable inputs) Convertible Notes for the years ended December 31, 2014, 2013 and 2012:
			Investor			Arcapita			Total
			Notes			Notes			Convertible
									Notes
	Balance at December 31, 2011		$	50,118		$	585		$	50,703
	Issuances of convertible notes			21,991			2,900			24,891
	Change in fair value included in interest expense			18,811			683			19,494
	Balance at December 31, 2012			90,920			4,168			95,088
	Issuances of convertible notes			2,090			1,440			3,530
	Fair value of notes exchanged for senior convertible notes			(5,971	)		(1,282	)		(7,253	)
	Gain on extinguishment of convertible notes			(8,498	)		(400	)		(8,898	)
	Change in fair value included in interest expense			8,938			469			9,407
	Balance at December 31, 2013			87,479			4,395			91,874
	Change in fair value included in interest expense			35,036			2,092			37,128
	Conversion of Convertible Notes			(122,515	)		(6,487	)		(129,002	)
	Balance at December 31, 2014		$	—		$	—		$	—
Senior Convertible Notes [Member]
Schedule of Roll-forward of Fair Value of Level 3 (Significant Unobservable Inputs) Convertible Notes	The following table presents a roll-forward of the fair value of Level 3 (significant unobservable inputs) Senior Convertible Notes for the years ended December 31, 2014, 2013 and 2012:
			March 2013			March 2013			Total Senior
			Investor			Arcapita			Convertible
			Notes			Notes			Notes
	Beginning balance as of December 31, 2012		$	—		$	—		$	—
	Issuances of senior convertible notes			13,435			1,536			14,971
	Fair value of notes exchanged for senior convertible notes			6,132			1,444			7,576
	Conversion of the Senior Convertible Notes			4,915			673			5,588
	Balance at December 31, 2013			24,482			3,653			28,135
	Change in fair value included in interest expense			9,803			1,570			11,373
	Conversion of Convertible Notes			(34,285	)		(5,223	)		(39,508	)
	Balance at December 31, 2014		$	—		$	—		$	—
Subordinated Notes [Member]
Schedule of Roll-forward of Fair Value of Level 3 (Significant Unobservable Inputs) Convertible Notes	The following table presents a roll-forward of the fair value of Level 3 (significant unobservable inputs) Subordinated Notes for the years ended December 31, 2014, 2013 and 2012:
	Balance at December 31, 2011		$	—
	Transfer into Level 3 on September 26, 2012 (1)			12,435
	Change in fair value included in interest expense			1,100
	Balance at December 31, 2012			13,535
	Change in fair value included in interest expense			3,771
	Balance at December 31, 2013			17,306
	Change in fair value included in interest expense			1,543
	Repayment			(18,849	)
	Balance at December 31, 2014		$	—
	-1	Fair value option election was made on September 26, 2012.

Convertible_Notes_Tables

Convertible Notes (Tables)	12 Months Ended
	Dec. 31, 2014
Schedule of Convertible Notes	Convertible Notes consist of the following:
		December 31
		2014		2013
		(In thousands)
	Investor Notes	$	—	$	87,479
	Arcapita Notes		—		4,395
	Total Convertible Notes		—		91,874
	Current maturities of convertible notes		—		(435	)
	Convertible Notes, excluding current portion	$	—	$	91,439
Summary of Difference between Aggregate Fair Value and Aggregate Unpaid Principal Balance of Convertible Notes Recorded at Fair Value	The following table presents the difference between the aggregate fair value and the aggregate unpaid principal balance of the Convertible Notes recorded at fair value at December 31, 2013:
		Aggregate fair value		Aggregate unpaid			Fair value over
				principal balance			unpaid principal
							balance
		(In thousands)
	Investor Notes	$	87,479	$	68,264		$	19,215
	Arcapita Notes		4,395		3,479			916
	Total Convertible Notes	$	91,874	$	71,743		$	20,131
Summary of Probability Weighted Discounted Cash Flow Analyses Utilized Assumptions Related to Probability of Occurrence of Each of Various Events and Appropriate Discount Rates for Each of Scenarios	The probability weighted discounted cash flow analyses utilized assumptions related to the probability of the occurrence of each of the various events and appropriate discount rates for each of the scenarios as of December 31, 2013 were as follows:
		December 31, 2013
	Potential exit scenario event	Estimated		Estimated
		exit date of		probability
		future event		of future
				event
	IPO scenario 1		6/30/14		45	%
	IPO scenario 2		3/31/15		5	%
	Sale scenario 1		6/30/14		15	%
	Sale scenario 2		3/31/15		15	%
	Dissolution		9/30/14		5	%
	Private company		At maturity		15	%
Senior Convertible Notes [Member]
Schedule of Convertible Notes	Senior Convertible Notes consist of the following:
		December 31,
		2014		2013
		(In thousands)
	March 2013 Investor Notes	$	—	$	24,482
	March 2013 Arcapita Notes		—		3,653
	Total Senior Convertible Notes	$	—	$	28,135
Summary of Difference between Aggregate Fair Value and Aggregate Unpaid Principal Balance of Convertible Notes Recorded at Fair Value	The following table presents the difference between the aggregate fair value and the aggregate unpaid principal balance of the Senior Convertible Notes recorded at fair value at December 31, 2013:
		Aggregate fair value		Aggregate unpaid			Fair value over
				principal balance			unpaid principal
							balance
		(In thousands)
	March 2013 Investor Notes	$	24,482	$	19,567		$	4,915
	March 2013 Arcapita Notes		3,653		2,980			673
	Total Senior Convertible Notes	$	28,135	$	22,547		$	5,588
Summary of Probability Weighted Discounted Cash Flow Analyses Utilized Assumptions Related to Probability of Occurrence of Each of Various Events and Appropriate Discount Rates for Each of Scenarios	The probability weighted discounted cash flow analyses utilized assumptions related to the probability of the occurrence of each of the various events and appropriate discount rates for each of the scenarios as of December 31, 2013 are as follows:
	Potential exit	Estimated		Estimated
	scenario event	exit date of		probability of
		future event		future event
	IPO scenario 1		6/30/14		45	%
	IPO scenario 2		3/31/15		5	%
	Sale scenario 1		6/30/14		15	%
	Sale scenario 2		3/31/15		15	%
	Dissolution		9/30/14		5	%
	Private company		At maturity		15	%

Interest_Expense_Tables

Interest Expense (Tables)	12 Months Ended
	Dec. 31, 2014
Banking and Thrift, Interest [Abstract]
Summary of Interest Expense	Interest expense consists of the following:
			Year ended December 31
			2014		2013		2012
	Changes in fair value:
	Subordinated notes		$	1,543	$	3,771	$	1,100
	Senior convertible notes			11,373		5,588		—
	Convertible notes, net of capitalization(1)			37,095		9,337		17,578
	Issuance of Series C preferred stock warrants in connection with senior convertible notes			—		10,677		—
	Subordinated notes interest, net of capitalization(2)			—		—		822
	Amortization of deferred financing costs for subordinated notes			—		—		636
	Debt closing costs			47		585		425
	Imputed interest on Cabot obligation			—		391		1,018
	Other interest			223		250		211
			$	50,281	$	30,599	$	21,790
	-1	The charge recognized as a result of the change in the fair value of the Company’s Convertible Notes is presented net of capitalized interest expense of $0.1 million, $0.1 million and $1.9 million for the years ended December 31, 2014, 2013 and 2012, respectively.
	-2	Interest expense recognized from the Company’s Subordinated Notes is presented net of capitalized interest expense of $0.0 million, $0.0 million and $0.3 million for the years ended December 31, 2014, 2013 and 2012, respectively.

Other_Longterm_Liabilities_Tab

Other Long-term Liabilities (Tables)	12 Months Ended
	Dec. 31, 2014
Other Liabilities Disclosure [Abstract]
Summary of Other Long-term Liabilities	Other long-term liabilities consist of the following:
		December 31
		2014			2013
		(In thousands)
	Asset retirement obligations (ARO)	$	1,018		$	1,009
	Other		62			112
			1,080			1,121
	Current maturities of other long-term liabilities		(50	)		(50	)
	Other long-term liabilities, less current maturities	$	1,030		$	1,071
Summary of ARO activity	A summary of ARO activity consists of the following:
		Year Ended December 31
		2014			2013
		(In thousands)
	Balance at beginning of period	$	1,009		$	1,000
	Accretion of discount expense		40			34
	Settlement costs		(31	)		(25	)
	Balance at end of period	$	1,018		$	1,009

Commitments_and_Contingencies_

Commitments and Contingencies (Tables)	12 Months Ended
	Dec. 31, 2014
Commitments and Contingencies Disclosure [Abstract]
Summary of Future Minimum Payments Under Capital Leases	Future minimum payments under capital leases at December 31, 2014 are as follows:
	Year	Capital Lease
		Obligations
		(In thousands)
	2015	$	87
	2016		64
	2017		30
	Total		181
	Less portion representing interest		(16	)
	Present value of future minimum payments		165
	Current maturities of capital lease payments		(76	)
	Capital leases, excluding current portion	$	89
Summary of Future Minimum Lease Payments Under Operating Leases	Future minimum lease payments under operating leases at December 31, 2014 are as follows:
	Year	Operating
		Leases
		(In thousands)
	2015	$	1,126
	2016		1,133
	2017		600
	2018		601
	2019		170
	Thereafter		34
	Total minimum lease payments	$	3,664

Employee_Stock_Ownership_Plans1

Employee Stock Ownership Plans (Tables)	12 Months Ended
	Dec. 31, 2014
Disclosure of Compensation Related Costs, Share-based Payments [Abstract]
Summary of Stock Based Compensation Included in Cost of Sales or Operating Expenses	Stock-based compensation is included in cost of sales or operating expenses, as applicable, and consists of the following:
		Year Ended
		December 31
		2014			2013			2012
		(In thousands)
	Cost of product revenue	$	1,121		$	496		$	221
	Research and development expenses		1,046			267			112
	Sales and marketing expenses		1,390			727			384
	General and administrative expenses		5,224			2,936			937
	Total stock-based compensation	$	8,781		$	4,426		$	1,654
Summary of Fair Value of Option Awards Estimated by Use of Black-Scholes Option Pricing Model	The following information relates to the fair value of the option awards estimated by use of the Black-Scholes option pricing model:
		Year Ended December 31
		2014			2013			2012
	Weighted average assumptions:
	Expected term (in years)		6.17			5.47			6.02
	Expected volatility		50.09	%		48.99	%		58.06	%
	Risk free rate		1.94	%		1.69	%		0.95	%
	Expected dividend yield		0	%		0	%		0	%
	Weighted average fair value:
	Grant-date fair value of options granted	$	5.37		$	0.12		$	5.6
	Grant-date fair value of options vested	$	97.31		$	0.18		$	2.3
	Aggregate intrinsic value of options exercised	$	4,816.50		$	—		$	—
Summary of Stock Option Outstanding	The following table summarizes information about stock options outstanding:
		Number of			Weighted			Weighted			Weighted		Aggregate
		Shares			Average			Average			Average		Intrinsic
					Grant Date			Exercise			Remaining		Value
					Fair Value			Price			Contractual
					Per Share			Per Share			Term
											(Years)
		($ in thousands, except share and per share data)
	Options outstanding at December 31, 2013		97,183		$	97.36		$	92.25			9.63
	Granted		934,018		$	5.37		$	10.78
	Forfeited		(4,660	)	$	20.14		$	21.45
	Exercised		(31	)	$	95.92		$	74.23				$	4,816.50
	Options outstanding at December 31, 2014		1,026,510		$	14.01		$	18.44			9.59	$	—
	Exercisable at December 31, 2014		63,731		$	97.31		$	82.1			8.59	$	—
	Expected to vest at December 31, 2014		827,504		$	8.82		$	13.46			9.66	$	—
Summary of Grants of RSUs	Information related to grants of RSUs during 2014 is as follows:
		Restricted			Weighted
		Stock
		Units			Average
					Grant Date
					Fair Value
	Balance at December 31, 2013		—		$	—
	Granted		318,517			10.78
	Vested		—			—
	Forfeited		(3,877	)		10.78
	Balance outstanding at December 31, 2014		314,640		$	10.78

Net_Income_Loss_Per_Share_Tabl

Net Income (Loss) Per Share (Tables)	12 Months Ended
	Dec. 31, 2014
Earnings Per Share [Abstract]
Computation of Basic and Diluted Net Income (Loss) Per Share	The computation of basic and diluted net income (loss) per share attributable to common stockholders consists of the following:
			Year ended December 31
			2014			2013			2012
			(In thousands, except share and per share data)
	Numerator:
	Net income (loss)		$	(66,324	)	$	(47,611	)	$	(56,142	)
	Deemed dividends on participating preferred stock (inclusive of issuance costs and changes in redemption value, including extinguishment):
	Series B			—			29,622			3,772
	Series A			—			55,543			43,429
	Total preferred stock deemed dividends			—			85,165			47,201
	Earnings attributable to participating convertible preferred stock shareholders and Series C preferred stock warrant holders			—			(36,216	)		—
	Net income (loss) attributable to common stockholders		$	(66,324	)	$	1,338		$	(8,941	)
	Denominator:
	Weighted average shares outstanding, basic			12,349,456			3,137			3,136
	Effect of warrants to purchase common stock			—			122			—
	Weighted average shares outstanding, diluted			12,349,456			3,259			3,136
	Net income (loss) attributable to common stockholders per common share, basic		$	(5.37	)	$	426.52		$	(2,851.08	)
	Effect of warrants to purchase common stock			—			(15.96	)		—
	Net income (loss) attributable to common stockholders per common share, diluted		$	(5.37	)	$	410.56		$	(2,851.08	)
Summary of Potential Dilutive Common Shares Excluded from Computation of Diluted Net Income (Loss) Attributable to Common Stockholders Per Common Share	Potential dilutive common shares that were excluded from the computation of diluted net income (loss) attributable to common stockholders per common share because they were anti-dilutive consist of the following:
			Year ended December 31
			2014			2013			2012
	Series B (a)			—			—			1,941
	Series A (a)			—			—			6,407
	Common stock options			1,026,510			21,846			2,749
	Restricted common stock units			314,640			—			—
	Common stock warrants			131			—			137
	Total			1,341,281			21,846			11,234
	(a)	Common stock equivalent reflecting conversion of preferred shares.

Income_Taxes_Tables

Income Taxes (Tables)	12 Months Ended
	Dec. 31, 2014
Income Tax Disclosure [Abstract]
Schedule of Reconciliation Between U.S. Statutory Income Tax Rate and Company's Effective Rate	The reconciliation between the U.S. statutory income tax rate and the Company’s effective rate consists of the following:
		Year Ended December 31
		2014			2013			2012
	U.S. federal income tax statutory rate		35	%		35	%		35	%
	Debt and warrant fair value adjustments		(26	%)		(16	%)		(12	%)
	Changes in valuation allowance for deferred tax assets		1	%		6	%		(22	%)
	Write down of losses not previously benefitted		(11	%)		(22	%)		0	%
	Other		1	%		(3	%)		(1	%)
	Effective tax rate		—			—			—
Schedule of Deferred Tax Assets and Deferred Tax Liabilities	The tax effects of temporary differences between financial statement and tax accounting that gave rise to significant portions of the Company’s deferred tax assets and deferred tax liabilities at December 31, 2014 and 2013 are presented below:
		December 31
		2014			2013
		(In thousands)
	Deferred tax assets:
	Net operating loss carryforwards	$	61,457		$	67,503
	Transaction related costs		—			1,494
	Stock-based compensation		4,479			2,460
	Tax credit carryforwards		379			393
	Reserves and accruals		282			896
	Intangible assets and amortization		384			—
	Other		5			127
	Total gross deferred tax assets		66,986			72,873
	Deferred tax liabilities:
	Depreciation	$	(3,311	)	$	(2,717	)
	Total deferred tax liabilities		(3,311	)		(2,717	)
	Total deferred tax assets and liabilities		63,675			70,156
	Valuation allowance		(63,675	)		(70,156	)
	Net deferred tax asset	$	—		$	—

Quarterly_Results_of_Operation1

Quarterly Results of Operations (Tables)	12 Months Ended
	Dec. 31, 2014
Quarterly Financial Information Disclosure [Abstract]
Summary of Quarterly Financial Information	QUARTERLY RESULTS OF OPERATIONS
	(in thousands, except per share data)
	(unaudited)
		Three Months Ended
		March 31,			June 30,			Sept 30,			Dec 31,
	2014
	Total revenue	$	22,363		$	26,615		$	25,437		$	27,984
	Gross profit		3,346			3,425			5,072			5,236
	Income (loss) from operations		(2,898	)		(8,121	)		(2,365	)		(2,658	)
	Net income (loss)		(19,049	)		(42,148	)		(2,412	)		(2,714	)
	Net income (loss) attributable to common stockholders		(19,049	)		(42,148	)		(2,412	)		(2,714	)
	Net income (loss) attributable to common stockholders per common share - basic	$	(6,065.89	)	$	(13.88	)	$	(0.10	)	$	(0.12	)
	Net income (loss) attributable to common stockholders per common share - diluted	$	(6,065.89	)	$	(13.88	)	$	(0.10	)	$	(0.12	)
	2013
	Total revenue	$	17,005		$	22,978		$	21,880		$	24,232
	Gross profit		38			3,531			3,580			3,583
	Income (loss) from operations		(6,025	)		(2,638	)		(4,665	)		(6,644	)
	Net income (loss)		1,027			(18,984	)		(8,038	)		(16,950	)
	Net income (loss) attributable to common stockholders		20,251			(18,984	)		(12,703	)		(16,950	)
	Net income (loss) attributable to common stockholders per common share - basic	$	6,455.53		$	(6,051.64	)	$	(4,049.41	)	$	(5,403.25	)
	Net income (loss) attributable to common stockholders per common share - diluted	$	6,455.21		$	(6,051.64	)	$	(4,049.41	)	$	(5,403.25	)

Description_of_Business_Additi

Description of Business - Additional Information (Detail) (USD $)	12 Months Ended	0 Months Ended
	Dec. 31, 2014	Jun. 18, 2014
	Subsidiary
Basis Of Presentation [Line Items]
Date of incorporation	4-May-01
Entity incorporation, state country name	Delaware
Number of Subsidiaries	2
Net proceeds	$74,712,000
Reverse stock split of capital stock	Prior to the closing of the offering, the Company completed a 1-for-824.7412544
Convertible Preferred Stock [Member]
Basis Of Presentation [Line Items]
Common shares issued upon conversion of securities		115,982
Convertible Debt Securities [Member]
Basis Of Presentation [Line Items]
Common shares issued upon conversion of securities		15,319,034
IPO [Member]
Basis Of Presentation [Line Items]
Initial public offering, common stock shares		7,500,000
Initial public offering, common stock price per share		11
Net proceeds		74,700,000
Underwriting discounts and commissions		4,300,000
Other offering expenses		3,500,000

Summary_of_Basis_of_Presentati2

Summary of Basis of Presentation and Significant Accounting Policies - Additional Information (Detail) (USD $)	12 Months Ended
	Dec. 31, 2014	Dec. 31, 2013	Dec. 31, 2012
Summary Of Significant Accounting Policies [Line Items]
Fair value of asset and liability	$0
Allowance for doubtful accounts	0	0
Number of segment	1
Maximum [Member]
Summary Of Significant Accounting Policies [Line Items]
Interest costs capitalized	100,000	100,000	2,300,000
Total Revenue [Member]
Summary Of Significant Accounting Policies [Line Items]
Number of customers	2	2	1
Accounts Receivable [Member]
Summary Of Significant Accounting Policies [Line Items]
Number of customers	3	3
Sales Returns Reserve [Member]
Summary Of Significant Accounting Policies [Line Items]
Sales return reserves	100,000	200,000
Customer One [Member] | Total Revenue [Member] | Customer Concentration Risk [Member]
Summary Of Significant Accounting Policies [Line Items]
Concentration risk, percentage	13.00%	15.00%	13.00%
Customer One [Member] | Accounts Receivable [Member] | Customer Concentration Risk [Member]
Summary Of Significant Accounting Policies [Line Items]
Concentration risk, percentage	17.00%	20.00%
Customer Two [Member] | Total Revenue [Member] | Customer Concentration Risk [Member]
Summary Of Significant Accounting Policies [Line Items]
Concentration risk, percentage	12.00%	11.00%
Customer Two [Member] | Accounts Receivable [Member] | Customer Concentration Risk [Member]
Summary Of Significant Accounting Policies [Line Items]
Concentration risk, percentage	17.00%	14.00%
Customers Three [Member] | Accounts Receivable [Member] | Customer Concentration Risk [Member]
Summary Of Significant Accounting Policies [Line Items]
Concentration risk, percentage	11.00%	11.00%
Accrued Expense [Member]
Summary Of Significant Accounting Policies [Line Items]
Reclassification adjustment		200,000
Other Assets [Member]
Summary Of Significant Accounting Policies [Line Items]
Reclassification adjustment		100,000
Other Noncurrent Liabilities [Member]
Summary Of Significant Accounting Policies [Line Items]
Reclassification adjustment		$100,000

Summary_of_Basis_of_Presentati3

Summary of Basis of Presentation and Significant Accounting Policies - Schedule of Revenues, Based on Shipment Destination or Services Location (Detail) (USD $)	3 Months Ended								12 Months Ended
In Thousands, unless otherwise specified	Dec. 31, 2014	Sep. 30, 2014	Jun. 30, 2014	Mar. 31, 2014	Dec. 31, 2013	Sep. 30, 2013	Jun. 30, 2013	Mar. 31, 2013	Dec. 31, 2014	Dec. 31, 2013	Dec. 31, 2012
Segment Reporting Information [Line Items]
Revenue	$27,984	$25,437	$26,615	$22,363	$24,232	$21,880	$22,978	$17,005	$102,399	$86,094	$63,453
U.S. [Member]
Segment Reporting Information [Line Items]
Revenue									39,809	30,164	19,909
International [Member]
Segment Reporting Information [Line Items]
Revenue									$62,590	$55,930	$43,544

Inventories_Schedule_of_Invent

Inventories - Schedule of Inventories (Detail) (USD $)	Dec. 31, 2014	Dec. 31, 2013
In Thousands, unless otherwise specified
Inventory Disclosure [Abstract]
Raw material	$4,052	$2,813
Finished goods	845	4,079
Total	$4,897	$6,892

Property_Plant_and_Equipment_N2

Property, Plant and Equipment, Net - Summary of Property, Plant and Equipment (Detail) (USD $)	12 Months Ended
In Thousands, unless otherwise specified	Dec. 31, 2014	Dec. 31, 2013
Property, Plant and Equipment [Line Items]
Property, plant and equipment, gross	$124,361	$105,244
Accumulated depreciation and amortization	-52,869	-43,221
Property, plant and equipment, net	71,492	62,023
Buildings [Member]
Property, Plant and Equipment [Line Items]
Property, plant and equipment, gross	16,303	16,303
Property, plant and equipment, Useful life	30 years
Machinery and Equipment [Member]
Property, Plant and Equipment [Line Items]
Property, plant and equipment, gross	78,378	77,466
Computer Equipment and Software [Member]
Property, Plant and Equipment [Line Items]
Property, plant and equipment, gross	5,556	5,298
Property, plant and equipment, Useful life	3 years
Construction in Progress [Member]
Property, Plant and Equipment [Line Items]
Property, plant and equipment, gross	$24,124	$6,177
Minimum [Member] | Machinery and Equipment [Member]
Property, Plant and Equipment [Line Items]
Property, plant and equipment, Useful life	5 years
Maximum [Member] | Machinery and Equipment [Member]
Property, Plant and Equipment [Line Items]
Property, plant and equipment, Useful life	10 years

Property_Plant_and_Equipment_N3

Property, Plant and Equipment, Net - Summary of Plant and Equipment under Capital Lease (Detail) (USD $)	Dec. 31, 2014	Dec. 31, 2013
In Thousands, unless otherwise specified
Property, Plant and Equipment [Line Items]
Total capital leases	$406	$401
Accumulated amortization	-265	-178
Capital leases, net	141	223
Office Equipment, at Cost [Member]
Property, Plant and Equipment [Line Items]
Total capital leases	118	113
Vehicles, at Cost [Member]
Property, Plant and Equipment [Line Items]
Total capital leases	$288	$288

Property_Plant_and_Equipment_N4

Property, Plant and Equipment, Net - Additional Information (Detail) (USD $)	3 Months Ended	12 Months Ended			3 Months Ended
	Dec. 31, 2012	Dec. 31, 2014	Dec. 31, 2013	Dec. 31, 2012	Dec. 31, 2013
Property, Plant and Equipment [Line Items]
Depreciation expense		$10,100,000	$10,000,000	$9,600,000
Amortization under capital leases		265,000	178,000		178,000
Amount of equipment charged to cost of sales	2,500,000
Property, plant and equipment, gross		124,361,000	105,244,000		105,244,000
Maximum [Member]
Property, Plant and Equipment [Line Items]
Amortization under capital leases	100,000	100,000	100,000	100,000	100,000
Interest expense capitalized		100,000	100,000	2,300,000
Construction in Progress [Member]
Property, Plant and Equipment [Line Items]
Amount of construction in progress write-off					3,400,000
Interest expense capitalized					400,000
Amount of Property, plant and equipment in alternative use as spare parts					2,300,000
Property, plant and equipment, gross		$24,124,000	$6,177,000		$6,177,000

Accrued_Expenses_Schedule_of_A

Accrued Expenses - Schedule of Accrued Expenses (Detail) (USD $)	Dec. 31, 2014	Dec. 31, 2013
In Thousands, unless otherwise specified
Accrued Liabilities, Current [Abstract]
Employee compensation	$4,851	$3,926
Professional fees	76	200
Deferred rent	155	112
Other accrued expenses	506	576
Accrued expenses, Total	$5,588	$4,814

Subordinated_Notes_Schedule_of

Subordinated Notes - Schedule of Subordinated Notes (Detail) (USD $)	Dec. 31, 2014	Dec. 31, 2013
In Thousands, unless otherwise specified
Debt Disclosure [Abstract]
Subordinated Notes		$17,306
Current maturities of Subordinated Notes		-17,306
Subordinated Notes, excluding current portion	$0	$0

Subordinated_Notes_Additional_

Subordinated Notes - Additional Information (Detail) (USD $)	0 Months Ended	12 Months Ended			0 Months Ended
	Mar. 28, 2013	Dec. 31, 2014	Dec. 31, 2013	Dec. 31, 2012	Sep. 26, 2012	Dec. 29, 2010
Subordinated Borrowing [Line Items]
Interest rate of subordinated notes issued		20.00%
Aggregate proceeds amount			$17,306,000
Total debt proceeds			18,500,000	24,890,000
Convertible notes, maturity date			28-Mar-16
Gain (loss) on extinguishment of subordinated debt	8,900,000		8,898,000
Fair value of Subordinated Notes			17,300,000	13,500,000
Minimum [Member]
Subordinated Borrowing [Line Items]
Interest rate of subordinated notes issued		12.75%
Maximum [Member]
Subordinated Borrowing [Line Items]
Interest rate of subordinated notes issued		15.00%
Interest expense capitalized		100,000	100,000	2,300,000
Convertible Notes [Member]
Subordinated Borrowing [Line Items]
Convertible notes, maturity date		30-Sep-14
Additional interest amount		1,400,000
Gain (loss) on extinguishment of subordinated debt			-8,898,000
Subordinated Notes [Member]
Subordinated Borrowing [Line Items]
Interest rate of subordinated notes issued						12.00%
Aggregate proceeds amount						10,000,000
Maturity date of subordinated notes						29-Dec-15
Stock warrants issued						181
Warrant expiration date		29-Dec-17
Convertible notes, maturity date		2-Mar-14
Increase in value of subordinated notes percentage					10.00%
Gain (loss) on extinguishment of subordinated debt						-1,400,000
Subordinated Notes, discount rate			20.00%	31.00%
No material difference if weightings were increased or decreased, percentage			10.00%	10.00%
Subordinated Notes, unpaid principal balance			15,900,000	13,100,000
Repayment of principal balance and accrued interest		18,800,000
Interest expense, inclusive of changes in fair value and amortization of deferred financing costs		1,500,000	3,800,000	2,900,000
Interest expense capitalized		0	0	300,000
Subordinated Notes [Member] | Stock Warrants [Member]
Subordinated Borrowing [Line Items]
Total debt proceeds						$2,200,000
Estimated fair value of the warrants risk free interest rate						2.75%
Estimated fair value of the warrant useful life						7 years 6 months
Estimated fair value of the warrants volatility rate						50.00%
Estimated fair value of the warrants expected dividend yield						$0
Subordinated Notes [Member] | Common Stock 0.00001 Par Value [Member]
Subordinated Borrowing [Line Items]
Common stock per share						$8.25
Subordinated Notes [Member] | Repayment Prior to Maturity on June 30, 2014 [Member]
Subordinated Borrowing [Line Items]
Weighing to arrive at discount rate			20.00%	65.00%
Subordinated Notes [Member] | Repayment at Maturity on September 30, 2014 [Member]
Subordinated Borrowing [Line Items]
Weighing to arrive at discount rate			80.00%	35.00%

Subordinated_Notes_Schedule_of1

Subordinated Notes - Schedule of Roll-forward of Fair Value of Level 3 (Significant Unobservable Inputs) Convertible Notes (Detail) (Subordinated Notes [Member], USD $)	12 Months Ended
In Thousands, unless otherwise specified	Dec. 31, 2014	Dec. 31, 2013	Dec. 31, 2012
Subordinated Notes [Member]
Fair Value, Liabilities Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]
Beginning balance	$17,306	$13,535
Transfer into Level 3 on September 26, 2012			12,435
Change in fair value included in interest expense	1,543	3,771	1,100
Repayment	-18,849
Ending balance		$17,306	$13,535

Senior_Convertible_Notes_Sched

Senior Convertible Notes - Schedule of Senior Convertible Notes (Detail) (USD $)	Dec. 31, 2014	Dec. 31, 2013
In Thousands, unless otherwise specified
Debt Instrument [Line Items]
Total Senior Convertible Notes	$0	$91,874
Senior Convertible Notes [Member]
Debt Instrument [Line Items]
Total Senior Convertible Notes		28,135
Senior Convertible Notes [Member] | March 2013 Investor Notes [Member]
Debt Instrument [Line Items]
Total Senior Convertible Notes		24,482
Senior Convertible Notes [Member] | March 2013 Arcapita Notes [Member]
Debt Instrument [Line Items]
Total Senior Convertible Notes		$3,653

Senior_Convertible_Notes_Addit

Senior Convertible Notes - Additional Information (Detail) (USD $)	0 Months Ended			1 Months Ended	12 Months Ended		1 Months Ended		0 Months Ended	1 Months Ended
	Dec. 31, 2013	Mar. 28, 2013	Dec. 31, 2012	Mar. 31, 2013	Dec. 31, 2014	Dec. 31, 2013	Jan. 31, 2013	Nov. 30, 2012	Jun. 18, 2014	31-May-13
Debt Instrument [Line Items]
Exercise price of warrants		$0.00
Warrants, expiry date		28-Mar-23
Convertible notes, maturity date						28-Mar-16
Interest expense related to the exchange						$5,400,000
Gain (loss) recognition for initial exchange		8,900,000				8,898,000
Interest expense				10,700,000
Debt issuance costs				900,000
Aggregate fair value of the convertible notes					129,000,000
Convertible senior notes conversion, common stock					11,727,430
Convertible Notes and accrued interest conversion percentage					62.50%
Initial public offering price					$11
Weighted average implied discount rates	40.00%		31.00%
Series C Warrants [Member]
Debt Instrument [Line Items]
Change in fair value included in interest income (expense)						10,700,000
Series C Warrants [Member] | Additional Paid-in Capital [Member]
Debt Instrument [Line Items]
Debt issuance costs					300,000
Senior Subordinated Notes [Member] | Interest Expense [Member]
Debt Instrument [Line Items]
Debt issuance costs					600,000
March 2013 Investor Notes [Member]
Debt Instrument [Line Items]
Interest rate of convertible notes					8.00%
Contingent payment of principal and interest multiple on maturity date					1.375
Contingent payment of principal and interest on maturity date					33,800,000
Convertible notes, maturity date					28-Mar-16
March 2013 Arcapita Notes [Member]
Debt Instrument [Line Items]
Convertible notes, maturity date					28-Mar-16
Option to purchase nonparticipating preferred stock upon conversion					1
Convertible preferred stock, liquidation preference value					5,200,000
Convertible Notes [Member]
Debt Instrument [Line Items]
Additional Senior Convertible Notes issued							7,500,000	7,500,000
Convertible notes, maturity date					30-Sep-14
Gain (loss) recognition for initial exchange						-8,898,000
Aggregate fair value of the convertible notes	91,900,000					91,900,000
Aggregate final payment amount of the convertible notes									129,000,000
Senior Convertible Notes [Member]
Debt Instrument [Line Items]
Additional Senior Convertible Notes issued		22,500,000		15,000,000						15,000,000
Aggregate fair value of the convertible notes									39,500,000
Convertible senior notes conversion, common stock									3,591,604
Convertible Notes and accrued interest conversion percentage									62.50%
Initial public offering price									$11
Weighted average implied discount rates	41.70%
Aggregate final payment amount of the convertible notes									39,500,000
Changes in fair value of notes					11,400,000	5,600,000
Exchanged Notes [Member]
Debt Instrument [Line Items]
Gain (loss) recognition for initial exchange						($5,700,000)
Series C [Member]
Debt Instrument [Line Items]
Warrants exercisable percentage		85.70%
Conversion of preferred stock into common stock									104,734

Senior_Convertible_Notes_Summa

Senior Convertible Notes - Summary of Difference between Aggregate Fair Value and Aggregate Unpaid Principal Balance of Senior Convertible Notes Recorded at Fair Value (Detail) (USD $)	Dec. 31, 2014	Dec. 31, 2013
In Thousands, unless otherwise specified
Fair Value, Option, Quantitative Disclosures [Line Items]
Total Senior Convertible Notes, Aggregate fair value	$0	$91,874
Total Senior Convertible Notes, Aggregate unpaid principal balance		71,743
Total Senior Convertible Notes, Fair value over unpaid principal balance		20,131
Senior Convertible Notes [Member]
Fair Value, Option, Quantitative Disclosures [Line Items]
Total Senior Convertible Notes, Aggregate fair value		28,135
Total Senior Convertible Notes, Aggregate unpaid principal balance		22,547
Total Senior Convertible Notes, Fair value over unpaid principal balance		5,588
Senior Convertible Notes [Member] | March 2013 Investor Notes [Member]
Fair Value, Option, Quantitative Disclosures [Line Items]
Total Senior Convertible Notes, Aggregate fair value		24,482
Total Senior Convertible Notes, Aggregate unpaid principal balance		19,567
Total Senior Convertible Notes, Fair value over unpaid principal balance		4,915
Senior Convertible Notes [Member] | March 2013 Arcapita Notes [Member]
Fair Value, Option, Quantitative Disclosures [Line Items]
Total Senior Convertible Notes, Aggregate fair value		3,653
Total Senior Convertible Notes, Aggregate unpaid principal balance		2,980
Total Senior Convertible Notes, Fair value over unpaid principal balance		$673

Senior_Convertible_Notes_Summa1

Senior Convertible Notes - Summary of Probability Weighted Discounted Cash Flow Analyses Utilized Assumptions Related to Probability of Occurrence of Each of Various Events and Appropriate Discount Rates for Each of Scenarios (Detail)	12 Months Ended
	Dec. 31, 2013
IPO Scenario 1 [Member]
Debt Instrument [Line Items]
Estimated exit date of future event	30-Jun-14
Estimated probability of future event	45.00%
IPO Scenario 2 [Member]
Debt Instrument [Line Items]
Estimated exit date of future event	31-Mar-15
Estimated probability of future event	5.00%
Sale Scenario 1 [Member]
Debt Instrument [Line Items]
Estimated exit date of future event	30-Jun-14
Estimated probability of future event	15.00%
Sale Scenario 2 [Member]
Debt Instrument [Line Items]
Estimated exit date of future event	31-Mar-15
Estimated probability of future event	15.00%
Dissolution [Member]
Debt Instrument [Line Items]
Estimated exit date of future event	30-Sep-14
Estimated probability of future event	5.00%
Private Company [Member]
Debt Instrument [Line Items]
Estimated probability of future event	15.00%

Senior_Convertible_Notes_Sched1

Senior Convertible Notes - Schedule of Roll-forward of Fair Value of Level 3 (Significant Unobservable Inputs) Senior Convertible Notes (Detail) (Senior Convertible Notes [Member], USD $)	12 Months Ended
In Thousands, unless otherwise specified	Dec. 31, 2014	Dec. 31, 2013
Fair Value, Liabilities Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]
Beginning balance	$28,135
Change in fair value included in interest expense	11,373
Issuances of senior convertible notes		14,971
Conversion of Convertible Notes	-39,508
Fair value of notes exchanged for senior convertible notes		7,576
Conversion of the Senior Convertible Notes		5,588
Ending balance		28,135
March 2013 Investor Notes [Member]
Fair Value, Liabilities Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]
Beginning balance	24,482
Change in fair value included in interest expense	9,803
Issuances of senior convertible notes		13,435
Conversion of Convertible Notes	-34,285
Fair value of notes exchanged for senior convertible notes		6,132
Conversion of the Senior Convertible Notes		4,915
Ending balance		24,482
March 2013 Arcapita Notes [Member]
Fair Value, Liabilities Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]
Beginning balance	3,653
Change in fair value included in interest expense	1,570
Issuances of senior convertible notes		1,536
Conversion of Convertible Notes	-5,223
Fair value of notes exchanged for senior convertible notes		1,444
Conversion of the Senior Convertible Notes		673
Ending balance		$3,653

Convertible_Notes_Schedule_of_

Convertible Notes - Schedule of Convertible Notes (Detail) (USD $)	Dec. 31, 2014	Dec. 31, 2013
In Thousands, unless otherwise specified
Debt Instrument [Line Items]
Total Convertible Notes	$0	$91,874
Current maturities of Convertible Notes		-435
Convertible notes, excluding current portion		91,439
Total Convertible Notes	0	91,874
Investor Notes [Member]
Debt Instrument [Line Items]
Total Convertible Notes		87,479
Total Convertible Notes		87,479
Arcapita Notes [Member]
Debt Instrument [Line Items]
Total Convertible Notes		4,395
Total Convertible Notes		$4,395

Convertible_Notes_Additional_I

Convertible Notes - Additional Information (Detail) (USD $)	0 Months Ended			12 Months Ended
	Dec. 31, 2013	Mar. 28, 2013	Dec. 31, 2012	Dec. 31, 2014	Dec. 31, 2013	Dec. 31, 2012	Jun. 18, 2014	Dec. 06, 2014	Dec. 06, 2016	Jun. 01, 2016
Debt Instrument [Line Items]
Convertible notes, maturity date					28-Mar-16
Convertible notes agreed to extend original principal amount		$300,000
Gain on extinguishment of convertible notes		8,900,000			8,898,000
Convertible Notes agreed to extend the original maturity date		2 years
Aggregate fair value of the convertible notes				129,000,000
Convertible notes conversion, common stock				11,727,430
Convertible Notes and accrued interest conversion percentage				62.50%
Initial public offering price				$11
Weighted average implied discount rates	40.00%		31.00%
Convertible Notes [Member]
Debt Instrument [Line Items]
Convertible notes, maturity date				30-Sep-14
Gain on extinguishment of convertible notes					-8,898,000
Aggregate fair value of the convertible notes	91,900,000				91,900,000
Aggregate final payment amount of the convertible notes							129,000,000
Change in fair value of Convertible Notes				37,100,000	9,400,000	17,600,000
Investor Notes [Member]
Debt Instrument [Line Items]
Subordinated convertible notes, issuance percentage				8.00%
Convertible notes, maturity date description				The Investor Notes had original maturity dates of June 1, 2014, June 14, 2014 and December 6, 2014, depending on their date of issuance.
Interest rate of convertible notes				8.00%
Contingent payment of principal and interest multiple on maturity date				1.375
Aggregate principal amount of debt instrument								500,000
Investor Notes [Member] | Scenario, Forecast [Member]
Debt Instrument [Line Items]
Aggregate principal amount of debt instrument									63,500,000	61,000,000
Investor Notes [Member] | June 2011 Through January 2013 [Member]
Debt Instrument [Line Items]
Subordinated convertible notes, issued				69,900,000
Investor Notes [Member] | Convertible Notes [Member]
Debt Instrument [Line Items]
Gain on extinguishment of convertible notes					-8,498,000
Arcapita Notes [Member]
Debt Instrument [Line Items]
Noninterest bearing convertible notes, issued				3,500,000
Convertible notes, maturity date				6-Dec-14
Option to purchase nonparticipating preferred stock upon conversion				1
Convertible preferred stock, liquidation preference value				6,800,000
Arcapita Notes [Member] | Convertible Notes [Member]
Debt Instrument [Line Items]
Gain on extinguishment of convertible notes					($400,000)

Convertible_Notes_Summary_of_D

Convertible Notes - Summary of Difference between Aggregate Fair Value and Aggregate Unpaid Principal Balance of Convertible Notes Recorded at Fair Value (Detail) (USD $)	Dec. 31, 2014	Dec. 31, 2013
In Thousands, unless otherwise specified
Debt Instrument [Line Items]
Total Convertible Notes	$0	$91,874
Total Convertible Notes, Aggregate unpaid principal balance		71,743
Total Convertible Notes, Fair value over unpaid principal balance		20,131
Investor Notes [Member]
Debt Instrument [Line Items]
Total Convertible Notes		87,479
Investor Notes [Member] | Convertible Notes [Member]
Debt Instrument [Line Items]
Total Convertible Notes		87,479
Total Convertible Notes, Aggregate unpaid principal balance		68,264
Total Convertible Notes, Fair value over unpaid principal balance		19,215
Arcapita Notes [Member]
Debt Instrument [Line Items]
Total Convertible Notes		4,395
Arcapita Notes [Member] | Convertible Notes [Member]
Debt Instrument [Line Items]
Total Convertible Notes		4,395
Total Convertible Notes, Aggregate unpaid principal balance		3,479
Total Convertible Notes, Fair value over unpaid principal balance		$916

Convertible_Notes_Summary_of_P

Convertible Notes - Summary of Probability Weighted Discounted Cash Flow Analyses Utilized Assumptions Related to Probability of Occurrence of Each of Various Events and Appropriate Discount Rates for Each of Scenarios (Detail)	12 Months Ended
	Dec. 31, 2013
IPO Scenario 1 [Member]
Debt Instrument [Line Items]
Estimated exit date of future event	30-Jun-14
Estimated probability of future event	45.00%
IPO Scenario 2 [Member]
Debt Instrument [Line Items]
Estimated exit date of future event	31-Mar-15
Estimated probability of future event	5.00%
Sale Scenario 1 [Member]
Debt Instrument [Line Items]
Estimated exit date of future event	30-Jun-14
Estimated probability of future event	15.00%
Sale Scenario 2 [Member]
Debt Instrument [Line Items]
Estimated exit date of future event	31-Mar-15
Estimated probability of future event	15.00%
Dissolution [Member]
Debt Instrument [Line Items]
Estimated exit date of future event	30-Sep-14
Estimated probability of future event	5.00%
Private Company [Member]
Debt Instrument [Line Items]
Estimated probability of future event	15.00%

Convertible_Notes_Schedule_of_1

Convertible Notes - Schedule of Roll-forward of Fair Value of Level 3 (Significant Unobservable Inputs) Convertible Notes (Detail) (USD $)	0 Months Ended	12 Months Ended
In Thousands, unless otherwise specified	Mar. 28, 2013	Dec. 31, 2013	Dec. 31, 2014	Dec. 31, 2012
Debt Instrument [Line Items]
Gain on extinguishment of convertible notes	$8,900	$8,898
Convertible Notes [Member]
Debt Instrument [Line Items]
Beginning balance		95,088	91,874	50,703
Issuances of convertible notes		3,530		24,891
Fair value of notes exchanged for senior convertible notes		-7,253
Gain on extinguishment of convertible notes		-8,898
Change in fair value included in interest expense		9,407	37,128	19,494
Conversion of Convertible Notes			-129,002
Ending balance		91,874		95,088
Convertible Notes [Member] | Investor Notes [Member]
Debt Instrument [Line Items]
Beginning balance		90,920	87,479	50,118
Issuances of convertible notes		2,090		21,991
Fair value of notes exchanged for senior convertible notes		-5,971
Gain on extinguishment of convertible notes		-8,498
Change in fair value included in interest expense		8,938	35,036	18,811
Conversion of Convertible Notes			-122,515
Ending balance		87,479		90,920
Convertible Notes [Member] | Arcapita Notes [Member]
Debt Instrument [Line Items]
Beginning balance		4,168	4,395	585
Issuances of convertible notes		1,440		2,900
Fair value of notes exchanged for senior convertible notes		-1,282
Gain on extinguishment of convertible notes		-400
Change in fair value included in interest expense		469	2,092	683
Conversion of Convertible Notes			-6,487
Ending balance		$4,395		$4,168

Revolving_Line_of_Credit_Addit

Revolving Line of Credit - Additional Information (Detail) (USD $)	12 Months Ended		0 Months Ended
	Dec. 31, 2014	Dec. 31, 2013	Sep. 03, 2014	Mar. 31, 2011
Line of Credit Facility [Line Items]
Credit facility initiation date	31-Mar-11
Line of credit agreement, extended maturity date		28-Mar-16
Line of credit facility amount withdrawn	$0	$1,000,000
Letters of credit outstanding	1,400,000	1,200,000
Line of credit facility borrowing capacity	12,400,000
Revolving Credit Facility [Member]
Line of Credit Facility [Line Items]
Line of credit agreement, extended maturity date			31-Aug-16
Interest rate description			The interest rate applicable to borrowings under the amended revolving credit facility may be based on the prime rate or the LIBOR. Prime rate-based rates vary from prime rate plus 0.75% per annum to prime rate plus 1.75% per annum, while LIBOR-based rates vary from LIBOR plus 3.75% per annum to LIBOR plus 4.25% per annum.
Percentage of unused revolving line facility fee			0.50%
Revolving Credit Facility [Member] | Silicon Valley Bank [Member]
Line of Credit Facility [Line Items]
Maximum borrowing amount				10,000,000
Revolving Credit Facility [Member] | Maximum [Member]
Line of Credit Facility [Line Items]
Maximum borrowing amount			20,000,000
Revolving Credit Facility [Member] | Maximum [Member] | Prime Rate [Member]
Line of Credit Facility [Line Items]
Additional interest rate per annum			1.75%
Revolving Credit Facility [Member] | Maximum [Member] | LIBOR Rate [Member]
Line of Credit Facility [Line Items]
Additional interest rate per annum			4.25%
Revolving Credit Facility [Member] | Minimum [Member]
Line of Credit Facility [Line Items]
Maximum borrowing amount			10,000,000
Revolving Credit Facility [Member] | Minimum [Member] | Prime Rate [Member]
Line of Credit Facility [Line Items]
Additional interest rate per annum			0.75%
Revolving Credit Facility [Member] | Minimum [Member] | LIBOR Rate [Member]
Line of Credit Facility [Line Items]
Additional interest rate per annum			3.75%

Interest_Expense_Summary_of_In

Interest Expense - Summary of Interest Expense (Detail) (USD $)	3 Months Ended								12 Months Ended
In Thousands, unless otherwise specified	Dec. 31, 2014	Sep. 30, 2014	Jun. 30, 2014	Mar. 31, 2014	Dec. 31, 2013	Sep. 30, 2013	Jun. 30, 2013	Mar. 31, 2013	Dec. 31, 2014	Dec. 31, 2013	Dec. 31, 2012
Interest Income (Expense) [Line Items]
Issuance of Series C preferred stock warrants in connection with senior convertible notes										$10,677
Amortization of deferred financing costs for subordinated notes									47	998	2,959
Debt closing costs									47	585	425
Imputed interest on Cabot obligation					391					391	1,018
Other interest									223	250	211
Total interest expense	-100	-100	-34,000	-16,200	-10,300	-8,000	-16,300	-7,100	50,281	30,599	21,790
Subordinated Notes [Member]
Interest Income (Expense) [Line Items]
Changes in fair value									1,543	3,771	1,100
Issuance of Series C preferred stock warrants in connection with senior convertible notes										10,677
Subordinated notes interest, net of capitalization											822
Amortization of deferred financing costs for subordinated notes											636
Senior Convertible Notes [Member]
Interest Income (Expense) [Line Items]
Changes in fair value									11,373	5,588
Convertible Notes, Net of Capitalization [Member]
Interest Income (Expense) [Line Items]
Changes in fair value									$37,095	$9,337	$17,578

Interest_Expense_Summary_of_In1

Interest Expense - Summary of Interest Expense (Parenthetical) (Detail) (USD $)	12 Months Ended
In Millions, unless otherwise specified	Dec. 31, 2014	Dec. 31, 2013	Dec. 31, 2012
Subordinated Notes [Member]
Interest Income (Expense) [Line Items]
Capitalized interest expense	$0	$0	$0.30
Convertible Notes, Net of Capitalization [Member]
Interest Income (Expense) [Line Items]
Capitalized interest expense	$0.10	$0.10	$1.90

Other_Longterm_Liabilities_Sum

Other Long-term Liabilities - Summary of Other Long-term Liabilities (Detail) (USD $)	Dec. 31, 2014	Dec. 31, 2013	Dec. 31, 2012
In Thousands, unless otherwise specified
Other Long Term Liabilities [Abstract]
Asset retirement obligations (ARO)	$1,018	$1,009	$1,000
Other	62	112
Other liabilities, total	1,080	1,121
Current maturities of other long-term liabilities	-50	-50
Other long-term liabilities, less current maturities	$1,030	$1,071

Other_Longterm_Liabilities_Sum1

Other Long-term Liabilities - Summary of ARO Activity (Detail) (USD $)	12 Months Ended
In Thousands, unless otherwise specified	Dec. 31, 2014	Dec. 31, 2013
Asset Retirement Obligation [Abstract]
Balance at beginning of period	$1,009	$1,000
Accretion of discount expense	40	34
Settlement costs	-31	-25
Balance at end of period	$1,018	$1,009

Other_Longterm_Liabilities_Add

Other Long-term Liabilities - Additional Information (Detail) (USD $)	12 Months Ended
In Millions, unless otherwise specified	Dec. 31, 2014	Sep. 21, 2007
Lease expiration	2016-08
Cash consideration payable		$38
Period of cash consideration payable	7 years
Net present value of consideration payable	19.3
Discount on consideration payable	18.7
Patent and Patent Application [Member]
Cash consideration payable	0.5
Fair market vale of the patents and patent application from related party	$1

Commitments_and_Contingencies_1

Commitments and Contingencies - Additional Information (Detail) (USD $)	12 Months Ended
In Millions, unless otherwise specified	Dec. 31, 2014	Dec. 31, 2013	Dec. 31, 2012
Commitments And Contingencies [Line Items]
Rent expense incurred under operating leases	$1.20	$1.20	$1.20
Letters of credit outstanding	1.4	1.2
Computer Equipment and Vehicles [Member]
Commitments And Contingencies [Line Items]
Recorded balance of capital lease obligations	$0.20	$0.20

Commitments_and_Contingencies_2

Commitments and Contingencies - Summary of Future Minimum Payments Under Capital Leases (Detail) (USD $)	Dec. 31, 2014	Dec. 31, 2013
In Thousands, unless otherwise specified
Commitments and Contingencies Disclosure [Abstract]
2015	$87
2016	64
2017	30
Total	181
Less portion representing interest	-16
Present value of future minimum payments	165
Present value of future minimum payments	165
Current maturities of capital lease payments	-76	-75
Capital leases, excluding current portion	$89	$165

Commitments_and_Contingencies_3

Commitments and Contingencies - Summary of Future Minimum Payments Under Operating Leases (Detail) (USD $)	Dec. 31, 2014
In Thousands, unless otherwise specified
Commitments and Contingencies Disclosure [Abstract]
2015	$1,126
2016	1,133
2017	600
2018	601
2019	170
Thereafter	34
Total minimum lease payments	$3,664

Conversion_of_Redeemable_Conve1

Conversion of Redeemable Convertible Preferred Stock - Additional Information (Detail) (USD $)	12 Months Ended		1 Months Ended	3 Months Ended
	Dec. 31, 2013	Dec. 31, 2014	Mar. 31, 2013	Mar. 31, 2013
Schedule Of Redeemable Convertible Preferred Stock [Line Items]
Remaining value of the Series B and Series A subsequent to extinguishment	$1,085,000
PWERM Method [Member] | Redeemable Convertible Preferred Stock [Member]
Schedule Of Redeemable Convertible Preferred Stock [Line Items]
Fair Value Measurements, Valuation Techniques		At the time of the March 2013 financing, the valuations were weighted as follows IPO, 40%; sale of the Company/assets, 45%; dissolution, 10%; and remain private, 5%. The estimated fair value of one share of common and preferred stock was estimated under each of the four scenarios and the associated probabilities to arrive at a probability weighted value per share.
PWERM Method [Member] | Redeemable Convertible Preferred Stock [Member] | IPO [Member]
Schedule Of Redeemable Convertible Preferred Stock [Line Items]
Percentage of weight used to determine fair value			40.00%
PWERM Method [Member] | Redeemable Convertible Preferred Stock [Member] | Sale of Company Assets [Member]
Schedule Of Redeemable Convertible Preferred Stock [Line Items]
Percentage of weight used to determine fair value			45.00%
PWERM Method [Member] | Redeemable Convertible Preferred Stock [Member] | Dissolution [Member]
Schedule Of Redeemable Convertible Preferred Stock [Line Items]
Percentage of weight used to determine fair value			10.00%
PWERM Method [Member] | Redeemable Convertible Preferred Stock [Member] | Private Placement [Member]
Schedule Of Redeemable Convertible Preferred Stock [Line Items]
Percentage of weight used to determine fair value			5.00%
PWERM Method [Member] | Redeemable Convertible Preferred Stock [Member] | Minimum [Member]
Schedule Of Redeemable Convertible Preferred Stock [Line Items]
Fair value of equity			20,000,000	20,000,000
PWERM Method [Member] | Redeemable Convertible Preferred Stock [Member] | Maximum [Member]
Schedule Of Redeemable Convertible Preferred Stock [Line Items]
Fair value of equity			215,000,000	215,000,000
Series B Convertible Preferred Stock 0.00001 Par Value [Member]
Schedule Of Redeemable Convertible Preferred Stock [Line Items]
Decreases in the redemption value of the Company's Series B and Series A shares				30,000,000
Series B Convertible Preferred Stock 0.00001 Par Value [Member] | PWERM Method [Member] | Redeemable Convertible Preferred Stock [Member]
Schedule Of Redeemable Convertible Preferred Stock [Line Items]
Price per share			0.2	$0.20
Series A Convertible Preferred Stock 0.00001 Par Value [Member]
Schedule Of Redeemable Convertible Preferred Stock [Line Items]
Decreases in the redemption value of the Company's Series B and Series A shares				56,100,000
Series A Convertible Preferred Stock 0.00001 Par Value [Member] | PWERM Method [Member] | Redeemable Convertible Preferred Stock [Member]
Schedule Of Redeemable Convertible Preferred Stock [Line Items]
Price per share			0.15	$0.15
Series A and Series B Redeemable Convertible Preferred Stock [Member]
Schedule Of Redeemable Convertible Preferred Stock [Line Items]
Convertible preferred stock, liquidation preference value			4,000,000	4,000,000
Series A and B Convertible Preferred Stock [Member]
Schedule Of Redeemable Convertible Preferred Stock [Line Items]
Gain on extinguishment of Series B and Series A			86,200,000
Remaining value of the Series B and Series A subsequent to extinguishment			1,100,000
Series A, Series B and Series C Redeemable Convertible Preferred Stock [Member]
Schedule Of Redeemable Convertible Preferred Stock [Line Items]
Outstanding shares conversion of convertible securities		115,982

Stockholders_Equity_Deficit_Ad

Stockholders' Equity (Deficit) - Additional Information (Detail) (USD $)	12 Months Ended	0 Months Ended
	Dec. 31, 2014	Jun. 18, 2014	Dec. 31, 2013
Stockholder Equity [Line Items]
Net proceeds	$74,712,000
Total number of shares authorized	130,000,000
Common stock, shares authorized	125,000,000		255,702
Preferred stock, shares authorized	5,000,000		0
Convertible Preferred Stock [Member]
Stockholder Equity [Line Items]
Common shares issued upon conversion of securities		115,982
Convertible Debt Securities [Member]
Stockholder Equity [Line Items]
Common shares issued upon conversion of securities		15,319,034
IPO [Member]
Stockholder Equity [Line Items]
Initial public offering, common stock shares		7,500,000
Initial public offering, common stock price per share		11
Net proceeds		74,700,000
Underwriting discounts and commissions		4,300,000
Other offering expenses		3,500,000

Employee_Stock_Ownership_Plans2

Employee Stock Ownership Plans - Summary of Stock Based Compensation Included in Cost of Sales or Operating Expenses (Detail) (USD $)	12 Months Ended
In Thousands, unless otherwise specified	Dec. 31, 2014	Dec. 31, 2013	Dec. 31, 2012
Components Of Other Operating Cost And Expense Line Items
Total stock-based compensation	$8,781	$4,426	$1,654
Cost of Product Revenue [Member]
Components Of Other Operating Cost And Expense Line Items
Total stock-based compensation	1,121	496	221
Research and Development Expenses [Member]
Components Of Other Operating Cost And Expense Line Items
Total stock-based compensation	1,046	267	112
Sales and Marketing Expenses [Member]
Components Of Other Operating Cost And Expense Line Items
Total stock-based compensation	1,390	727	384
General and Administrative Expenses [Member]
Components Of Other Operating Cost And Expense Line Items
Total stock-based compensation	$5,224	$2,936	$937

Employee_Stock_Ownership_Plans3

Employee Stock Ownership Plans - Additional Information (Detail) (USD $)	0 Months Ended		12 Months Ended			9 Months Ended
	Dec. 20, 2013	Aug. 07, 2013	Dec. 31, 2014	Dec. 31, 2013	Dec. 31, 2012	Sep. 30, 2014
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Shares issued for 2014 Equity Plan			934,018
Common stock, shares issued			22,992,273	3,137
Stock option issued term				10 years
Number of comparable companies for expected volatility			The estimated volatility reflects the incorporation of the historical volatility of comparable companies with publicly available share prices. In 2014, 2013 and 2012, the expected volatility is based on the weighted average volatility of up to seven companies within various industries that the Company believes are similar to its own.
Expected dividend yield			0.00%	0.00%	0.00%
Incremental compensation expense resulting from modification	$1,000,000	$7,800,000
Unrecognized compensation cost related to nonvested options grants			6,800,000
Non-Employee Directors [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Aggregate value of restricted stock issuance						700,000
2014 Equity Plan [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Stock option issued term			10 years	10 years	10 years
Shares reserved for stock-based awards granted			1,244,781
Additional shares reserved for stock-based awards granted under the plan			96,369
Shares available for grant during period			3,750,420
Expected volatility	97.40%	96.80%
Performance-Based Awards [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Proportionate allocation of outstanding stock for performance based option				15.38%
Incremental compensation expense resulting from modification			6,400,000
Unrecognized compensation cost related to nonvested options grants			900,000
Unrecognized compensation cost period for recognition			1 year 7 months 6 days
Restricted Stock Units [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Issue of stock-based awards						318,517
Restricted Stock Units [Member] | Non-Employee Directors [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Stock options vesting period			1 year
Common stock, shares issued						61,816
Restricted Stock Units [Member] | 2014 Equity Plan [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Unrecognized compensation cost related to nonvested options grants			2,600,000
Unrecognized compensation cost period for recognition			3 years 1 month 10 days
Service Based Awards [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Incremental compensation expense resulting from modification		2,000,000	400,000
Unrecognized compensation cost related to nonvested options grants			5,900,000
Unrecognized compensation cost period for recognition			2 years 9 months 4 days
Restricted Stock Awards [Member] | 2014 Equity Plan [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Unrecognized compensation cost related to nonvested options grants			$300,000
Unrecognized compensation cost period for recognition			5 months 9 days
Non Qualified Stock Option [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Shares issued for 2014 Equity Plan						934,018
Minimum [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Stock options vesting period						3 years
Minimum [Member] | 2014 Equity Plan [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Stock options vesting period			3 years
Minimum [Member] | Performance-Based Awards [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Stock options vesting period				3 years
Minimum [Member] | Restricted Stock Units [Member] | Employee [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Stock options vesting period			3 years
Maximum [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Stock options vesting period						4 years
Maximum [Member] | 2014 Equity Plan [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Stock options vesting period			4 years
Maximum [Member] | Performance-Based Awards [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Stock options vesting period				4 years
Maximum [Member] | Restricted Stock Units [Member] | Employee [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Stock options vesting period			4 years

Employee_Stock_Ownership_Plans4

Employee Stock Ownership Plans - Summary of Fair Value of Option Awards Estimated by Use of Black-Scholes Option Pricing Model (Detail) (USD $)	12 Months Ended
	Dec. 31, 2014	Dec. 31, 2013	Dec. 31, 2012
Weighted average assumptions:
Expected term (in years)	6 years 2 months 1 day	5 years 5 months 19 days	6 years 7 days
Expected volatility	50.09%	48.99%	58.06%
Risk free rate	1.94%	1.69%	0.95%
Expected dividend yield	0.00%	0.00%	0.00%
Weighted average fair value:
Grant-date fair value of options granted	$5.37	$0.12	$5.60
Grant-date fair value of options vested	$97.31	$0.18	$2.30
Aggregate intrinsic value of options exercised	$4,816,500

Employee_Stock_Ownership_Plans5

Employee Stock Ownership Plans - Summary of Stock Option Outstanding (Detail) (USD $)	12 Months Ended
	Dec. 31, 2014	Dec. 31, 2013	Dec. 31, 2012
Disclosure of Compensation Related Costs, Share-based Payments [Abstract]
Number of shares, Beginning Balance	97,183
Number of shares, Granted	934,018
Number of shares, Forfeited	-4,660
Number of shares, Exercised	-31
Number of shares, Ending Balance	1,026,510	97,183
Number of shares, Exercisable at December 31, 2014	63,731
Number of shares, Expected to vest at December 31, 2014	827,504
Weighted Average Grant Date Fair Value Per Share, Beginning Balance	$97.36
Weighted Average Grant Date Fair Value Per Share, Granted	$5.37	$0.12	$5.60
Weighted Average Grant Date Fair Value Per Share, Forfeited	$20.14
Weighted Average Grant Date Fair Value Per Share, Exercised	$95.92
Weighted Average Grant Date Fair Value Per Share, Ending Balance	$14.01	$97.36
Weighted Average Grant Date Fair Value Per Share, Exercisable at December 31, 2014	$97.31	$0.18	$2.30
Weighted Average Grant Date Fair Value Per Share, Expected to vest at December 31, 2014	$8.82
Weighted Average Exercise Price Per Share, Beginning Balance	$92.25
Weighted Average Exercise Price Per Share, Granted	$10.78
Weighted Average Exercise Price Per Share, Forfeited	$21.45
Weighted Average Exercise Price Per Share, Exercised	$74.23
Weighted Average Exercise Price Per Share, Ending Balance	$18.44	$92.25
Weighted Average Exercise Price Per Share, Exercisable at December 31, 2014	$82.10
Weighted Average Exercise Price Per Share, Expected to vest at December 31, 2014	$13.46
Weighted Average Remaining Contractual Term, Beginning Balance	9 years 7 months 2 days	9 years 7 months 17 days
Weighted Average Remaining Contractual Term, Exercisable at December 31, 2014	8 years 7 months 2 days
Weighted Average Remaining Contractual Term, Expected to vest at December 31, 2014	9 years 7 months 28 days
Aggregate Intrinsic Value, Beginning Balance	$0
Aggregate intrinsic Value, Granted	$0
Aggregate intrinsic Value, Forfeited	0
Aggregate intrinsic Value, Exercised	4,816,500
Aggregate intrinsic Value, Ending Balance	0	0
Aggregate intrinsic Value, Exercisable at December 31, 2014	0
Aggregate intrinsic Value, Expected to vest at December 31, 2014	$0

Employee_Stock_Ownership_Plans6

Employee Stock Ownership Plans - Summary of Grants of RSUs (Detail) (USD $)	12 Months Ended
	Dec. 31, 2014
Restricted Stock Units [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Restricted Stock Awards and Restricted Stock Units, Granted	318,517
Restricted Stock Awards and Restricted Stock Units, Vested	0
Restricted Stock Awards and Restricted Stock Units, Forfeited	-3,877
Restricted Stock Awards and Restricted Stock Units, Ending Balance	314,640
Weighted Average Grant Date Fair Value, Granted	$10.78
Weighted Average Grant Date Fair Value, Vested	$0
Weighted Average Grant Date Fair Value, Forfeited	$10.78
Restricted Stock and Restricted Stock Unit [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Weighted Average Grant Date Fair Value, Ending Balance	$10.78

Net_Income_Loss_Per_Share_Comp

Net Income (Loss) Per Share - Computation of Basic and Diluted Net Income (Loss) Per Share (Detail) (USD $)	3 Months Ended								12 Months Ended
In Thousands, except Share data, unless otherwise specified	Dec. 31, 2014	Sep. 30, 2014	Jun. 30, 2014	Mar. 31, 2014	Dec. 31, 2013	Sep. 30, 2013	Jun. 30, 2013	Mar. 31, 2013	Dec. 31, 2014	Dec. 31, 2013	Dec. 31, 2012
Numerator:
Net income (loss)	($2,714)	($2,412)	($42,148)	($19,049)	($16,950)	($8,038)	($18,984)	$1,027	($66,324)	($47,611)	($56,142)
Total preferred stock deemed dividends										85,165	47,201
Net income (loss) attributable to common stockholders									-66,324	1,338	-8,941
Denominator:
Weighted average shares outstanding, basic									12,349,456	3,137	3,136
Effect of warrants to purchase common stock										122
Weighted average shares outstanding, diluted									12,349,456	3,259	3,136
Net income (loss) attributable to common stockholders per share, basic	($0.12)	($0.10)	($13.88)	($6,065.89)	($5,403.25)	($4,049.41)	($6,051.64)	$6,455.53	($5.37)	$426.52	($2,851.08)
Effect of warrants to purchase common stock										($15.96)
Net income (loss) attributable to common stockholders per share, diluted	($0.12)	($0.10)	($13.88)	($6,065.89)	($5,403.25)	($4,049.41)	($6,051.64)	$6,455.21	($5.37)	$410.56	($2,851.08)
Series B [Member]
Numerator:
Total preferred stock deemed dividends										29,622	3,772
Series A [Member]
Numerator:
Total preferred stock deemed dividends										55,543	43,429
Series C [Member]
Numerator:
Earnings attributable to participating convertible preferred stock shareholders and Series C preferred stock warrant holders										($36,216)

Net_Income_Loss_Per_Share_Summ

Net Income (Loss) Per Share - Summary of Potential Dilutive Common Shares Excluded from Computation of Diluted Net Income (Loss) Attributable to Common Stockholders Per Common Share (Detail)	12 Months Ended
	Dec. 31, 2014	Dec. 31, 2013	Dec. 31, 2012
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items]
Anti-dilutive Securities	1,341,281	21,846	11,234
Series B [Member]
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items]
Anti-dilutive Securities			1,941
Series A [Member]
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items]
Anti-dilutive Securities			6,407
Common Stock Options [Member]
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items]
Anti-dilutive Securities	1,026,510	21,846	2,749
Restricted Stock Units [Member]
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items]
Anti-dilutive Securities	314,640
Common Stock Warrants [Member]
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items]
Anti-dilutive Securities	131		137

Net_Income_Loss_Per_Share_Addi

Net Income (Loss) Per Share - Additional Information (Detail) (USD $)	Dec. 31, 2013	Dec. 31, 2012
In Millions, except Share data, unless otherwise specified
IPO [Member]
Earnings Per Share [Line Items]
Outstanding common stock options exercisable into common stock	97,183
Senior Convertible Notes [Member]
Earnings Per Share [Line Items]
Senior convertible notes, outstanding	$28.10
Convertible Notes [Member]
Earnings Per Share [Line Items]
Senior convertible notes, outstanding	$91.90	$95.10

Income_Taxes_Schedule_of_Recon

Income Taxes - Schedule of Reconciliation Between U.S. Statutory Income Tax Rate and Company's Effective Rate (Detail)	12 Months Ended
	Dec. 31, 2014	Dec. 31, 2013	Dec. 31, 2012
Effective Income Tax Rate Reconciliation, Percent [Abstract]
U.S. federal income tax statutory rate	35.00%	35.00%	35.00%
Debt and warrant fair value adjustments	-26.00%	-16.00%	-12.00%
Changes in valuation allowance for deferred tax assets	1.00%	6.00%	-22.00%
Write down of losses not previously benefitted	-11.00%	-22.00%	0.00%
Other	1.00%	-3.00%	-1.00%
Effective tax rate	0.00%	0.00%	0.00%

Income_Taxes_Schedule_of_Defer

Income Taxes - Schedule of Deferred Tax Assets and Deferred Tax Liabilities (Detail) (USD $)	Dec. 31, 2014	Dec. 31, 2013
In Thousands, unless otherwise specified
Deferred tax assets:
Net operating loss carryforwards	$61,457	$67,503
Transaction related costs		1,494
Stock-based compensation	4,479	2,460
Tax credit carryforwards	379	393
Reserves and accruals	282	896
Intangible assets and amortization	384
Other	5	127
Total gross deferred tax assets	66,986	72,873
Deferred tax liabilities:
Depreciation	-3,311	-2,717
Total deferred tax liabilities	-3,311	-2,717
Total deferred tax assets and liabilities	63,675	70,156
Valuation allowance	-63,675	-70,156
Net deferred tax asset	$0	$0

Income_Taxes_Additional_Inform

Income Taxes - Additional Information (Detail) (USD $)	12 Months Ended
	Dec. 31, 2014	Dec. 31, 2013	Dec. 31, 2012	Jun. 10, 2008
Income Taxes [Line Items]
Net change in valuation allowance	$6,500,000
Net operating loss carryforwards	113,200,000
Built-in gains existed at the date of the ownership change	42,000,000			29,500,000
Built in gains trigger period	5 years
Net operating loss carryforwards expiration date	Jun-19
Net operating losses available to offset future state taxable income expiration description	Between 2015 and 2034
Unrecognized tax benefits	0	0	0
Interest and penalties related to unrecognized tax benefits	0	0	0
Expected amount of unrecognized tax benefits	0	0	0
Built-in gains change in ownership period	5 years
Net operating losses	42,000,000
December 31, 2010 [Member]
Income Taxes [Line Items]
Net operating loss carryforwards expiration date	Jun-13
Federal [Member]
Income Taxes [Line Items]
Net operating loss carryforwards	161,400,000
Net operating loss carryforwards expiration date	31-Dec-34
State and Local Jurisdiction [Member]
Income Taxes [Line Items]
Net operating loss carryforwards	$106,000,000

Related_Party_Transactions_Add

Related Party Transactions - Additional Information (Detail) (Stockholder [Member], USD $)	12 Months Ended
In Millions, unless otherwise specified	Dec. 31, 2014	Dec. 31, 2013	Dec. 31, 2012
Stockholder [Member]
Related Party Transaction [Line Items]
Sale of aerogel product to related party	$4.70	$8.90	$10.70
Trade receivables from related party	$2	$2

Quarterly_Results_of_Operation2

Quarterly Results of Operations -Summary of Quarterly Financial Information (Detail) (USD $)	3 Months Ended								12 Months Ended
In Thousands, except Per Share data, unless otherwise specified	Dec. 31, 2014	Sep. 30, 2014	Jun. 30, 2014	Mar. 31, 2014	Dec. 31, 2013	Sep. 30, 2013	Jun. 30, 2013	Mar. 31, 2013	Dec. 31, 2014	Dec. 31, 2013	Dec. 31, 2012
Quarterly Financial Information Disclosure [Abstract]
Total revenue	$27,984	$25,437	$26,615	$22,363	$24,232	$21,880	$22,978	$17,005	$102,399	$86,094	$63,453
Gross profit	5,236	5,072	3,425	3,346	3,583	3,580	3,531	38	17,080	10,731	-7,968
Income (loss) from operations	-2,658	-2,365	-8,121	-2,898	-6,644	-4,665	-2,638	-6,025	-16,043	-19,972	-32,973
Net income (loss)	-2,714	-2,412	-42,148	-19,049	-16,950	-8,038	-18,984	1,027	-66,324	-47,611	-56,142
Net income (loss) attributable to common stockholders	($2,714)	($2,412)	($42,148)	($19,049)	($16,950)	($12,703)	($18,984)	$20,251
Net income (loss) attributable to common stockholders per common share - basic	($0.12)	($0.10)	($13.88)	($6,065.89)	($5,403.25)	($4,049.41)	($6,051.64)	$6,455.53	($5.37)	$426.52	($2,851.08)
Net income (loss) attributable to common stockholders per common share - diluted	($0.12)	($0.10)	($13.88)	($6,065.89)	($5,403.25)	($4,049.41)	($6,051.64)	$6,455.21	($5.37)	$410.56	($2,851.08)

Quarterly_Results_of_Operation3

Quarterly Results of Operations -Additional Information (Detail) (USD $)	3 Months Ended								12 Months Ended
In Thousands, unless otherwise specified	Dec. 31, 2014	Sep. 30, 2014	Jun. 30, 2014	Mar. 31, 2014	Dec. 31, 2013	Sep. 30, 2013	Jun. 30, 2013	Mar. 31, 2013	Dec. 31, 2014	Dec. 31, 2013	Dec. 31, 2012
Quarterly Financial Information Disclosure [Abstract]
Interest expenses	$100	$100	$34,000	$16,200	$10,300	$8,000	$16,300	$7,100	($50,281)	($30,599)	($21,790)

Schedule_II_Valuation_and_Qual

Schedule II - Valuation and Qualifying Accounts (Detail) (Allowances For Uncollectible Accounts and Sales Returns and Allowances [Member], USD $)	12 Months Ended
In Millions, unless otherwise specified	Dec. 31, 2014	Dec. 31, 2013	Dec. 31, 2012
Allowances For Uncollectible Accounts and Sales Returns and Allowances [Member]
Valuation and Qualifying Accounts Disclosure [Line Items]
Balance at Beginning of Year	$209	$421	$282
Charges to Costs and Expenses	0	0	0
Deductions to Allowances for Uncollectible Accounts			-103
Charges to (Deductions from) Other Accounts	-89	-212	242
Balance at End of Year	$120	$209	$421