Aspen Aerogels (ASPN) 10-Q 2 Aug 19 2019 Q2 Quarterly report Financial data

Document and Entity Information

Document and Entity Information - shares	6 Months Ended
	Jun. 30, 2019	Jul. 31, 2019
Document And Entity Information [Abstract]
Document Type	10-Q
Amendment Flag	false
Document Period End Date	Jun. 30, 2019
Document Fiscal Year Focus	2019
Document Fiscal Period Focus	Q2
Trading Symbol	ASPN
Entity Registrant Name	ASPEN AEROGELS INC
Entity Central Index Key	0001145986
Current Fiscal Year End Date	--12-31
Entity Filer Category	Accelerated Filer
Entity Small Business	true
Entity Emerging Growth Company	true
Entity Ex Transition Period	true
Entity Common Stock, Shares Outstanding		24,300,264
Entity Current Reporting Status	Yes
Entity Shell Company	false
Entity File Number	001-36481
Entity Tax Identification Number	043559972
Entity Address, Address Line One	30 Forbes Road, Building B
Entity Address, State or Province	Massachusetts
Entity Address, City or Town	Northborough
Entity Address, Postal Zip Code	01532
City Area Code	508
Local Phone Number	691-1111

Consolidated Balance Sheets

Consolidated Balance Sheets - USD ($) $ in Thousands	Jun. 30, 2019	Dec. 31, 2018
Current assets:
Cash and cash equivalents	$ 3,322	$ 3,327
Accounts receivable, net of allowances of $2,661 and $2,877	22,166	25,565
Inventories	13,099	7,318
Prepaid expenses and other current assets	1,320	1,041
Total current assets	39,907	37,251
Property, plant and equipment, net	57,319	61,699
Operating lease right-of-use assets	4,461
Other long-term assets	75	73
Total assets	101,762	99,023
Current liabilities:
Accounts payable	10,028	12,392
Accrued expenses	4,045	3,864
Revolving line of credit	2,885	4,181
Deferred revenue	6,915	2,629
Operating lease liabilities	1,057
Total current liabilities	24,930	23,066
Deferred rent		1,218
Prepayment liability	9,784	4,485
Deferred revenue long-term	1,942
Operating lease liabilities long-term	4,762
Total liabilities	41,418	28,769
Commitments and contingencies (Note 7)
Stockholders’ equity:
Preferred stock, $0.00001 par value; 5,000,000 shares authorized, no shares issued and outstanding at June 30, 2019 and December 31, 2018
Common stock, $0.00001 par value; 125,000,000 shares authorized, 24,300,264 and 23,973,517 shares issued and outstanding at June 30, 2019 and December 31, 2018, respectively	0	0
Additional paid-in capital	543,249	541,839
Accumulated deficit	(482,905)	(471,585)
Total stockholders’ equity	60,344	70,254
Total liabilities and stockholders’ equity	$ 101,762	$ 99,023

Consolidated Balance Sheets (Pa

Consolidated Balance Sheets (Parenthetical) - USD ($) $ in Thousands	Jun. 30, 2019	Dec. 31, 2018
Statement Of Financial Position [Abstract]
Allowance for doubtful accounts	$ 2,661	$ 2,877
Preferred stock, par value	$ 0.00001	$ 0.00001
Preferred stock, shares authorized	5,000,000	5,000,000
Preferred stock, shares issued	0	0
Preferred stock, shares outstanding	0	0
Common stock, par value	$ 0.00001	$ 0.00001
Common stock, shares authorized	125,000,000	125,000,000
Common stock, shares issued	24,300,264	23,973,517
Common stock, shares outstanding	24,300,264	23,973,517

Consolidated Statements of Oper

Consolidated Statements of Operations - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2019	Jun. 30, 2018	Jun. 30, 2019	Jun. 30, 2018
Revenue:
Total revenue	$ 29,533	$ 21,671	$ 57,445	$ 44,745
Cost of revenue:
Gross profit	3,514	2,744	7,232	5,554
Operating expenses:
Research and development	1,868	1,638	3,796	3,243
Sales and marketing	3,509	3,721	7,020	7,220
General and administrative	3,352	4,240	7,592	8,696
Total operating expenses	8,729	9,599	18,408	19,159
Loss from operations	(5,215)	(6,855)	(11,176)	(13,605)
Interest expense, net	(103)	(103)	(144)	(195)
Total interest expense, net	(103)	(103)	(144)	(195)
Net loss	$ (5,318)	$ (6,958)	$ (11,320)	$ (13,800)
Net loss per share:
Basic and diluted	$ (0.22)	$ (0.29)	$ (0.47)	$ (0.58)
Weighted-average common shares outstanding:
Basic and diluted	24,118,620	23,743,358	24,025,136	23,655,676
Product [Member]
Revenue:
Total revenue	$ 28,908	$ 21,115	$ 55,693	$ 43,636
Cost of revenue:
Cost of revenue	25,715	18,676	49,193	38,699
Research Services [Member]
Revenue:
Total revenue	625	556	1,752	1,109
Cost of revenue:
Cost of revenue	$ 304	$ 251	$ 1,020	$ 492

Consolidated Statements of Stoc

Consolidated Statements of Stockholders' Equity - USD ($) $ in Thousands	Total	Common Stock 0.00001 Par Value [Member]	Additional Paid-in Capital [Member]	Accumulated Deficit [Member]
Beginning balance at Dec. 31, 2017	$ 100,943		$ 538,088	$ (437,145)
Beginning balance, shares at Dec. 31, 2017		23,643,189
Net loss	(6,842)			(6,842)
Stock compensation expense	1,136		1,136
Vesting of restricted stock units	(504)		(504)
Vesting of restricted stock units, shares		239,064
Ending balance at Mar. 31, 2018	94,733		538,720	(443,987)
Ending balance, shares at Mar. 31, 2018		23,882,253
Beginning balance at Dec. 31, 2017	100,943		538,088	(437,145)
Beginning balance, shares at Dec. 31, 2017		23,643,189
Net loss	(13,800)
Ending balance at Jun. 30, 2018	88,925		539,870	(450,945)
Ending balance, shares at Jun. 30, 2018		23,940,315
Beginning balance at Mar. 31, 2018	94,733		538,720	(443,987)
Beginning balance, shares at Mar. 31, 2018		23,882,253
Net loss	(6,958)			(6,958)
Stock compensation expense	1,150		1,150
Issuance of restricted stock, shares		58,062
Ending balance at Jun. 30, 2018	88,925		539,870	(450,945)
Ending balance, shares at Jun. 30, 2018		23,940,315
Beginning balance at Dec. 31, 2018	70,254		541,839	(471,585)
Beginning balance, shares at Dec. 31, 2018		23,973,517
Net loss	(6,002)			(6,002)
Stock compensation expense	878		878
Vesting of restricted stock units	(454)		(454)
Vesting of restricted stock units, shares		273,290
Ending balance at Mar. 31, 2019	64,676		542,263	(477,587)
Ending balance, shares at Mar. 31, 2019		24,246,807
Beginning balance at Dec. 31, 2018	70,254		541,839	(471,585)
Beginning balance, shares at Dec. 31, 2018		23,973,517
Net loss	(11,320)
Ending balance at Jun. 30, 2019	60,344		543,249	(482,905)
Ending balance, shares at Jun. 30, 2019		24,300,264
Beginning balance at Mar. 31, 2019	64,676		542,263	(477,587)
Beginning balance, shares at Mar. 31, 2019		24,246,807
Net loss	(5,318)			(5,318)
Stock compensation expense	996		996
Issuance of restricted stock, shares		50,328
Vesting of restricted stock units	(10)		(10)
Vesting of restricted stock units, shares		3,129
Ending balance at Jun. 30, 2019	$ 60,344		$ 543,249	$ (482,905)
Ending balance, shares at Jun. 30, 2019		24,300,264

Consolidated Statements of Cash

Consolidated Statements of Cash Flows - USD ($) $ in Thousands	6 Months Ended
	Jun. 30, 2019	Jun. 30, 2018
Cash flows from operating activities:
Net loss	$ (11,320)	$ (13,800)
Adjustments to reconcile net loss to net cash used in operating activities:
Depreciation and amortization	5,097	5,686
Stock-compensation expense	1,874	2,286
Operating lease right-of-use assets	459
Lease incentives		(60)
Changes in operating assets and liabilities:
Accounts receivable	3,399	6,658
Inventories	(5,781)	(3,907)
Prepaid expenses and other assets	(281)	106
Accounts payable	(1,823)	(2,208)
Accrued expenses	332	(1,138)
Deferred revenue	6,627	152
Operating lease liabilities	(470)
Other liabilities	(56)	(22)
Net cash used in operating activities	(1,943)	(6,247)
Cash flows from investing activities:
Capital expenditures	(1,302)	(1,657)
Net cash used in investing activities	(1,302)	(1,657)
Cash flows from financing activities:
Repayment of borrowings under line of credit, net	(1,296)
Prepayment proceeds under customer supply agreement	5,000	5,000
Payments made for employee restricted stock tax withholdings	(464)	(504)
Net cash provided by financing activities	3,240	4,496
Net decrease in cash	(5)	(3,408)
Cash and cash equivalents at beginning of period	3,327	10,694
Cash and cash equivalents at end of period	3,322	7,286
Supplemental disclosures of cash flow information:
Interest paid	198	141
Supplemental disclosures of non-cash activities:
Initial recognition of operating lease liabilities related to right-of-use assets	5,995
Right-of-use assets obtained in exchange for new operating lease liabilities	294
Changes in accrued capital expenditures	$ (541)	$ (50)

Description of Business and Bas

Description of Business and Basis of Presentation	6 Months Ended
	Jun. 30, 2019
Organization Consolidation And Presentation Of Financial Statements [Abstract]
Description of Business and Basis of Presentation	(1) Description of Business and Basis of Presentation Nature of Business Aspen Aerogels, Inc. (the Company) is an aerogel technology company that designs, develops and manufactures innovative, high-performance aerogel insulation used primarily in the energy infrastructure and building materials markets. 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 three wholly owned subsidiaries: Aspen Aerogels Rhode Island, LLC, Aspen Aerogels Germany, GmbH and Aspen Aerogels Georgia, LLC. Liquidity During the six months ended June 30, 2019, the Company incurred a net loss of $11.3 million and used $1.9 million of cash in operations. The Company had a cash and cash equivalents balance of $3.3 million and outstanding borrowing under its revolving line of credit of $2.9 million as of June 30, 2019 (see note 7). After giving effect to outstanding borrowings and letters of credit, the additional amount available to the Company at June 30, 2019 under the revolving line of credit was $6.4 million. The Company is making investments to increase capacity at its existing manufacturing facility in East Providence, Rhode Island and to develop new technologies and business opportunities. The Company expects its existing cash balance and the amount anticipated to be available under the existing revolving line of credit will be sufficient to fund a portion of these investments. The Company plans to manage other capital expenditures and working capital balances to maintain the cash resources required to support current operating requirements and to complete the capacity expansion plan. The Company will need to supplement its cash balance and amounts available under its revolving line of credit with anticipated cash flows from operations, debt financings, customer prepayments, technology licensing agreements or equity financings to provide the capital required to complete the expansion of the existing manufacturing facility and to fund its strategic business initiatives. Unaudited Interim Financial Information The accompanying unaudited interim consolidated financial statements include the accounts of the Company and have been prepared in accordance with accounting principles generally accepted in the United States of America (U.S. GAAP) and with the instructions to Form 10-Q and Article 10 of Regulation S-X. Certain information and disclosures normally included in the consolidated financial statements prepared in accordance with U.S. GAAP have been condensed or omitted pursuant to such rules and regulations. As such, the information included in this Quarterly Report on Form 10-Q should be read in conjunction with the audited consolidated financial statements and accompanying notes in our Annual Report on Form 10-K for the year ended December 31, 2018 (the Annual Report), filed with the Securities and Exchange Commission on March 8, 2019. In the opinion of the Company’s management, the unaudited interim consolidated financial statements have been prepared on the same basis as the audited consolidated financial statements and include all adjustments that are of a normal recurring nature and necessary for the fair statement of the Company’s financial position as of June 30, 2019 and the results of its operations and stockholders’ equity for the six months ended June 30, 2019 and 2018 and the cash flows for the six month periods then ended. The Company has evaluated events through the date of this filing. The results of operations for the three and six months ended June 30, 2019 are not necessarily indicative of the results to be expected for the year ending December 31, 2019 or any other period.

Significant Accounting Policies

Significant Accounting Policies	6 Months Ended
	Jun. 30, 2019
Accounting Policies [Abstract]
Significant Accounting Policies	(2) Significant Accounting Policies Principles of Consolidation The accompanying consolidated financial statements, which have been prepared in accordance with U.S. GAAP, include the accounts of the Company and its wholly owned subsidiaries. All intercompany balances and transactions have been eliminated in consolidation. 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, sales returns and allowances, product warranty costs, inventory valuation, the carrying amount of property and equipment, 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 are believed to be reasonable under the circumstances. Management adjusts such estimates and assumptions when facts and circumstances warrant. Illiquid credit markets, volatile equity markets and declines in business investment can 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 and 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. Revenue Recognition On January 1, 2018, the Company adopted Accounting Standards Codification 606, Revenue from Contracts with Customers (ASC 606). See note 3 for further details. Leases On January 1, 2019, the Company adopted Accounting Standards Update (ASU) 2016-02, Leases (Topic 842) . See note 8 for further details. Stock-based Compensation Stock-based compensation expense 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. The fair value of awards containing market conditions is determined using a Monte Carlo simulation model based upon the nature of the conditions, the expected volatility of the underlying security, and other relevant factors. During the six months ended June 30, 2019, the Company granted 50,328 shares of restricted common stock with a grant date fair value of $0.3 million and non-qualified options (NSOs) to purchase 71,700 shares of common stock with a grant date fair value of $0.2 million vesting over a period of one year to its non-employee directors under the 2014 Employee, Director, and Consultant Equity Incentive Plan (the 2014 Equity Plan). six months ended June 30, 2019, the Company also granted 654,582 restricted common stock units (RSUs) with a grant date fair value of $2.4 million and NSOs to purchase 632,183 shares of common stock with a grant date fair value of $1.1 million to employees under the 2014 Equity Plan. The RSUs and NSOs granted to employees will vest over a three year period. Stock-based compensation is included in cost of revenue or operating expenses, as applicable, and consists of the following: Three Months Ended Six Months Ended June 30, June 30, 2019 2018 2019 2018 (In thousands) Cost of product revenue $ 123 $ 162 $ 240 $ 316 Research and development expenses 130 120 244 231 Sales and marketing expenses 164 209 293 441 General and administrative expenses 579 659 1,097 1,298 Total stock-based compensation $ 996 $ 1,150 $ 1,874 $ 2,286 Pursuant to the “evergreen” provisions of the 2014 Equity Plan, the number of shares of common stock authorized for issuance under the plan automatically increased by 479,470 shares to 7,488,930 shares effective January 1, 2019. As of June 30, 2019, 4,697,434 shares of common stock were reserved for issuance upon the exercise or vesting of outstanding stock-based awards granted under the 2014 Equity Plan. In addition, as of June 30, 2019, 87,235 shares of common stock were reserved for issuance upon the exercise of outstanding stock options granted under the Company’s 2001 Equity Incentive Plan, as amended (the 2001 Equity Plan). Any cancellations or forfeitures of the options outstanding under the 2001 Equity Plan will result in the shares reserved for issuance upon exercise of such options becoming available for grant under the 2014 Equity Plan. As of June 30, 2019, the Company has either issued or reserved in connection with statutory tax withholdings a total of 1,782,795 shares under the 2014 Equity Plan. As of June 30, 2019, there were 921,466 shares of common stock available for future grant under the 2014 Equity Plan. Net Loss per Share The Company calculates net 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 loss gives effect to all potentially dilutive common equivalent shares, including outstanding stock options, and RSUs. Common equivalent shares are excluded from the computation of diluted net loss per share if their effect is antidilutive. 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 total revenues, based on shipment destination or services location, is presented in the following table: Three Months Ended Six Months Ended June 30, June 30, 2019 2018 2019 2018 (In thousands) Revenue: U.S. $ 14,972 $ 9,310 $ 26,224 $ 19,192 International 14,561 12,361 31,221 25,553 Total $ 29,533 $ 21,671 $ 57,445 $ 44,745 Warranty The Company provides warranties for its products and records the estimated cost within cost of revenue in the period that the related revenue is recorded. The Company’s standard warranty period extends to one year from the date of shipment. This standard warranty provides 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. The Company’s products may be utilized in systems that involve new technical demands and new configurations. Accordingly, the Company regularly reviews and assesses whether warranty reserves should be recorded in the period the related revenue is recorded. For an initial shipment of product for use in a system with new technical demands or new configurations and where the Company is unsure of meeting the customer’s specifications, the Company will defer the recognition of product revenue and related costs until written customer acceptance is obtained. The Company performs periodic testing of its aerogel blankets to ensure compliance with published performance specifications. From time to time, tests may indicate a product could potentially perform outside of these specifications. At that time, additional testing is initiated or the Company may conduct a root cause investigation. During the year ended December 31, 2018, test results indicated that tested samples performed outside the published performance specifications for a specific attribute of a product. The Company has completed its assessment of the impact of the testing results on its customer base and, based on that completed assessment, has determined that it is remote that the Company has incurred a liability as of June 30, 2019 The Company did not record any warranty expense during the six months ended June 30, 2019 and 2018. As of June 30, 2019, the Company had satisfied all warranty claims. Recently Issued Accounting Standards From time to time, new accounting pronouncements are issued by the Financial Accounting Standards Board (FASB) or other standard setting bodies. Recently issued standards typically do not require adoption until a future effective date. Prior to their effective date, the Company evaluates the pronouncements to determine the potential effects of adoption to its consolidated financial statements. Standards Implemented Since December 31, 2018 In February 2016, the FASB issued ASU 2016-02, Leases (Topic 842) . FASB ASU 2016-02 modifies the accounting for leases and requires that all leases be recorded on the consolidated balance sheets as assets and liabilities. This standard is effective for fiscal years beginning after December 15, 2018. Standards to be Implemented The Company believes that the impact of recently issued accounting standards that are not yet effective will not have a material impact on its consolidated financial statements.

Revenue from Contracts with Cus

Revenue from Contracts with Customers	6 Months Ended
	Jun. 30, 2019
Revenue From Contract With Customer [Abstract]
Revenue from Contracts with Customers	(3) Revenue from Contracts with Customers On January 1, 2018, the Company Adopted Accounting Standards Codification 606, Revenue from Contracts with Customers (ASC 606) using the modified retrospective method for all contracts not completed as of the date of adoption. The adoption of ASC 606 did not have a material impact on the allocation and timing of the recognition of previously reported revenues from the sale of products, subsea projects or the performance of research services. In addition, the Company determined that there are no incremental contract costs or contract fulfillment costs associated with the adoption of ASC 606. The adoption of ASC 606 represents a change in accounting principle that more closely aligns revenue recognition with the delivery of the Company's product or performance of research services and will provide financial statement readers with enhanced disclosures. Revenue Recognition Revenue is recognized when a customer obtains control of promised goods or services in an amount that reflects the consideration which the entity expects to receive in exchange for those goods or services. To determine revenue recognition for arrangements within the scope of ASC 606, the Company performs the following five steps: (i) identification of the contract with a customer; (ii) identification of the performance obligations in the contract; (iii) determination of the transaction price; (iv) allocation of the transaction price to the separate performance obligations in the contract; and (v) recognition of the revenue associated with performance obligations as they are satisfied. The Company applies the five-step model to contracts when it is probable that the Company will collect the consideration it is entitled to in exchange for the goods or services it transfers to the customer. At contract inception, once the contract is determined to be within the scope of ASC 606, the Company assesses the goods or services promised within each contract and determines those that are performance obligations, and assesses whether each promised good or service is distinct. If the contract contains a single performance obligation, the entire transaction price is allocated to the single performance obligation. Contracts that contain multiple performance obligations require an allocation of the transaction price based on the estimated relative standalone selling prices of the promised products or services underlying each performance obligation. The Company determines standalone selling prices based on the price at which the performance obligation is sold separately. If the standalone selling price is not observable through past transactions, the Company estimates the standalone selling price taking into account available information such as market conditions and internally approved pricing guidelines related to the performance obligations. The Company then recognizes as revenue the amount of the transaction price that is allocated to the respective performance obligation when (or as) the performance obligation is satisfied. When determining the transaction price of a contract, an adjustment is made if payment from a customer occurs either significantly before or significantly after performance, resulting in a significant financing component. Applying the practical expedient in paragraph ASC 606-10-32-18, the Company does not assess whether a significant financing component exists if the period between when the Company performs its obligations under the contract and when the customer pays is one year or less. The Company did not have any contracts outstanding at December 31, 2018 and did not enter into any contracts during the six months ended June 30, 2019 that contained a significant financing component. 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 the completion of required performance obligations. Shipping and Handling Costs Shipping and handling costs associated with outbound freight after control over a product has transferred to a customer are accounted for as fulfillment costs and are included in the cost of product revenue. The amount of revenue recognized reflects the consideration to which the Company expects to be entitled to receive in exchange for these products or research services. Product Revenue The Company generally enters into contracts containing one type of performance obligation. The Company recognizes product revenue when the performance obligation is satisfied, which is generally upon delivery according to contractual shipping terms within customer purchase orders. The Company also enters into rebate agreements with certain customers. These agreements may be considered an additional performance obligation of the Company or variable consideration within a contract. Rebates are recorded as a reduction of revenue in the period the related product revenue is recognized. A corresponding liability is recorded as a component of deferred revenue on the consolidated balance sheets. These arrangements are primarily based on the customer attaining contractually specified sales volumes. The Company estimates the amount of its product sales that may be returned by its customers and records this estimate as a reduction of revenue in the period the related product revenue is recognized. The Company currently estimates product return liabilities using historical rates of return, current quarter credit sales, and specific items of exposure on a contract by contract basis. Sales return reserves were approximately $0.1 million at both June 30, 2019 and December 31, 2018. Subsea Projects The Company manufactures and sells subsea products that are designed for pipe-in-pipe applications in offshore oil production and are typically customized to meet customer specifications. Subsea products typically have no alternative use and contain an enforceable right to payment. Customer invoicing terms for subsea products are typically based on certain milestones within the production and delivery schedule. Under the provisions of ASC 606, the Company recognizes revenue at a point in time when transfer of control of the products is passed to the customer, or , Research Services The Company performs research services under contracts with various government agencies and other institutions. These contracts generally have one type of performance obligation associated with the provision of research services including functional licenses to any resulting intellectual property. The Company records revenue 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; and (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 under the Company’s research service contracts is the labor effort expended in completing the research, and typically the only deliverable, other than the labor hours expended, is the 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 toward 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. 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 within the period they become known. To date, adjustments to revenue as a result of contracting agency audits have been insignificant Disaggregation of Revenue In the following tables, revenue is disaggregated by primary geographical region and source of revenue: Three Months Ended June 30, 2019 2018 U.S. International Total U.S. International Total (In thousands) Geographical region Asia $ — $ 7,786 $ 7,786 $ — $ 7,673 $ 7,673 Canada — 9 9 — 596 596 Europe — 5,864 5,864 — 3,411 3,411 Latin America — 902 902 — 681 681 U.S. 14,972 — 14,972 9,310 — 9,310 Total revenue $ 14,972 $ 14,561 $ 29,533 $ 9,310 $ 12,361 $ 21,671 Source of revenue Product revenue $ 10,790 $ 10,334 $ 21,124 $ 8,754 $ 12,361 $ 21,115 Subsea projects 3,557 4,227 7,784 — — — Research services 625 — 625 556 — 556 Total revenue $ 14,972 $ 14,561 $ 29,533 $ 9,310 $ 12,361 $ 21,671 Six Months Ended June 30, 2019 2018 U.S. International Total U.S. International Total (In thousands) Geographical region Asia $ — $ 14,509 $ 14,509 $ — $ 15,901 $ 15,901 Canada — 1,906 1,906 — 2,271 2,271 Europe — 12,987 12,987 — 5,866 5,866 Latin America — 1,819 1,819 — 1,515 1,515 U.S. 26,224 — 26,224 19,192 — 19,192 Total revenue $ 26,224 $ 31,221 $ 57,445 $ 19,192 $ 25,553 $ 44,745 Source of revenue Product revenue $ 20,915 $ 22,299 $ 43,214 $ 18,078 $ 24,714 $ 42,792 Subsea projects 3,557 8,922 12,479 5 839 844 Research services 1,752 — 1,752 1,109 — 1,109 Total revenue $ 26,224 $ 31,221 $ 57,445 $ 19,192 $ 25,553 $ 44,745 Contract Balances The following table presents changes in the Company’s contract assets and contract liabilities during the six months ended June 30, 2019: Balance at December 31, 2018 Additions Deductions Balance at June 30, 2019 (In thousands) Contract assets Subsea projects $ 2,742 $ 17,923 $ (15,062 ) $ 5,603 Research services 369 1,482 (904 ) 947 Total contract assets $ 3,111 $ 19,405 $ (15,966 ) $ 6,550 Contract liabilities Deferred revenue Product revenue $ 1,751 $ 8,356 $ (1,764 ) $ 8,343 Subsea projects 781 6,379 (6,910 ) 250 Research services 97 212 (45 ) 264 Prepayment liability 4,485 5,353 (54 ) 9,784 Total contract liabilities $ 7,114 $ 20,300 $ (8,773 ) $ 18,641 During the six months ended June 30, 2019, the Company recognized $1.4 million of revenue that was included in deferred revenue at the beginning of the period. A contract asset is recorded when the Company satisfies a performance obligation by transferring a promised good or service and has earned the right to consideration from its customer. These assets may represent a conditional or unconditional right to consideration and are included within accounts receivable on the consolidated balance sheets. A contract liability is recorded when consideration is received, or such consideration is unconditionally due, from a customer prior to transferring goods or services under the terms of the contract. Contract liabilities are recognized as revenue after control of the products or services is transferred to the customer and all revenue recognition criteria have been met.

Inventories

Inventories	6 Months Ended
	Jun. 30, 2019
Inventory Disclosure [Abstract]
Inventories	(4) Inventories Inventories consist of the following: June 30, December 31, 2019 2018 (In thousands) Raw materials $ 4,488 $ 3,159 Finished goods 8,611 4,159 Total $ 13,099 $ 7,318

Property, Plant and Equipment,

Property, Plant and Equipment, Net	6 Months Ended
	Jun. 30, 2019
Property Plant And Equipment [Abstract]
Property, Plant and Equipment, Net	(5) Property, Plant and Equipment, Net Property, plant and equipment consist of the following: June 30, December 31, Useful 2019 2018 life (In thousands) Construction in progress $ 150 $ 1,568 — Buildings 24,016 24,016 30 years Machinery and equipment 122,286 120,466 3-10 years Computer equipment and software 8,540 8,352 3 years Total 154,992 154,402 Accumulated depreciation (97,673 ) (92,703 ) Property, plant and equipment, net $ 57,319 $ 61,699 Depreciation expense was $5.1 million and $5.7 million for the six months ended June 30, 2019 and 2018, respectively. Construction in progress included less than $0.1 million and $1.2 million at June 30, 2019 and December 31, 2018, respectively, related to projects associated with the Company’s plan to expand the capacity of the East Providence, Rhode Island facility.

Accrued Expenses

Accrued Expenses	6 Months Ended
	Jun. 30, 2019
Payables And Accruals [Abstract]
Accrued Expenses	(6) Accrued Expenses Accrued expenses consist of the following: June 30, December 31, 2019 2018 (In thousands) Employee compensation $ 2,848 $ 2,750 Other accrued expenses 1,197 1,114 Total $ 4,045 $ 3,864

Commitments and Contingencies

Commitments and Contingencies	6 Months Ended
	Jun. 30, 2019
Commitments And Contingencies Disclosure [Abstract]
Commitments and Contingencies	(7) Commitments and Contingencies Customer Supply Agreement The Company is party to a supply agreement, as amended, with BASF Polyurethanes GmbH (BASF) (the Supply Agreement) and a joint development agreement with BASF SE (the JDA). Pursuant to the Supply Agreement, the Company will sell exclusively to BASF certain of the Company’s products at annual volumes to be specified by BASF, subject to certain volume limits. However, BASF has no obligation to purchase products under the Supply Agreement. The Supply Agreement will terminate on December 31, 2027 with respect to the Company’s Spaceloft A2 product and December 31, 2028 with respect to a new product developed under the JDA. Upon the expiration of the Supply Agreement with respect to each product, the Company will be subject to a post-termination supply commitment for an additional two years. The JDA is designed to facilitate collaboration by the parties on the development and commercialization of new products. In addition, BASF, in its sole discretion, may make prepayments to the Company in the aggregate amount of up to $22.0 million during the term of the Supply Agreement. These prepayment obligations are secured by a security interest in real estate, plant and equipment at the Company’s Rhode Island facility and a license to certain intellectual property. BASF made a prepayment in the amount of $5.0 million to the Company in 2018 (the 2018 Prepayment). Beginning January 1, 2019, BASF may require that the Company credit up to 25.3% of any amounts invoiced by the Company for the Spaceloft A2 product sold to BASF against the 2018 Prepayment balance. If any of the 2018 Prepayment remains uncredited as of December 31, 2021, BASF may require that the Company repay the uncredited amount to BASF. Pursuant to the first addendum to the Supply Agreement, on January 30, 2019, BASF made an additional prepayment in the amount of $5.0 million to the Company (the 2019 Prepayment). After January 1, 2020, the Company will credit 50.0% of any amounts that it invoices for the newly developed product sold to BASF against the outstanding balance of the 2019 Prepayment. As of June 30, 2019, the Company had received $10.0 million in prepayments from BASF and applied less than $0.1 million of credits against amounts invoiced. The prepayments are recorded on the balance sheet as a prepayment liability, net of the current portion of $0.2 million which is included within deferred revenue. The amounts and terms of additional prepayment installments, if any, are subject to negotiation between the Company and BASF. Revolving Line of Credit The Company is party to an Amended and Restated Loan and Security Agreement with Silicon Valley Bank (the Loan Agreement). On March 4, 2019, the Loan Agreement was amended to extend the maturity date of the revolving credit facility to April 28, 2020. Under the revolving credit facility the Company is permitted to borrow a maximum of $20.0 million, subject to continued covenant compliance and borrowing base requirements. At the Company’s election, the interest rate applicable to borrowings under the revolving credit facility may be based on the prime rate or LIBOR. Prime rate-based rates vary from prime rate plus 0.75% per annum to prime rate plus 2.00% 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. Under the Loan Agreement, the Company is required to comply with both non-financial and financial covenants, including a minimum EBITDA covenant, as defined. At June 30, 2019, the Company was in compliance with all such covenants. Obligations under the Loan Agreement are secured by a security interest in all assets of the Company, including those at the East Providence facility, except for certain exclusions. The Company intends to extend or replace the facility prior to its maturity. At June 30, 2019 and December 31, 2018, the Company had $2.9 million and $4.2 million, respectively, drawn on the revolving credit facility. The Company has been required to provide letters of credit to secure obligations under certain commercial contracts and other obligations. The Company had outstanding letters of credit backed by the revolving credit facility of $0.6 million and $1.6 million at June 30, 2019 and December 31, 2018, respectively, which reduce the funds otherwise available to the Company under the facility. At June 30, 2019, the effective amount available to the Company under the revolving credit facility was $6.4 million after giving effect to the $2.9 million in outstanding borrowings and $0.6 million of outstanding letters of credit. Litigation The Company is, from time to time, a party to litigation that arises in the normal course of its business operations. See Part II, Item 1 “Legal Proceedings” of this Quarterly Report on Form 10-Q for a description of certain of the Company’s current legal proceedings. 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.

Leases

Leases	6 Months Ended
	Jun. 30, 2019
Leases [Abstract]
Leases	(8) Leases The Company leases office and warehouse space in Northborough, Massachusetts and East Providence, Rhode Island under operating leases. The Company also leases equipment under operating leases. The Company’s operating leases expire at various dates through 2026. Under these agreements, the Company is obligated to pay annual rent, real estate taxes, and certain other operating expenses. On January 1, 2019, the Company adopted ASU 2016-02 which modifies the accounting for leases and requires that all leases be recorded on the consolidated balance sheets as assets and liabilities. The Company adopted this standard using the modified retrospective transition approach with the effective date as the date of initial application. As a result, the Company did not update financial information or provide the disclosures otherwise required under the new standard for dates and periods before January 1, 2019. The Company also elected the package of practical expedients under the new standard, which permits the Company to not reassess prior conclusions about lease identification, lease classification, and initial direct costs. In addition, the Company elected the short-term lease recognition exemption under which the Company will not recognize ROU assets or lease liabilities for all leases that qualify. The Company also elected the practical expedient to not separate non-lease components from the associated lease components for all of its equipment leases. The Company determines if an arrangement is a lease at inception. ROU assets represent the Company’s right to use an underlying asset for the lease term and lease liabilities represent the Company’s payment obligations under the lease. Operating lease ROU assets and liabilities are recognized based on the present value of lease payments over the lease term. To measure its lease liabilities, the Company uses its incremental borrowing rate or the rate implicit in the lease, if available. ROU assets also include any direct costs and prepaid lease payments but exclude any lease incentives received. The Company’s lease terms may include options to extend or terminate the lease when it is reasonably certain that the Company will exercise that option. Lease expense for lease payments is recognized on a straight-line basis over the lease term. The Company elected the short-term lease recognition exemption for all leases that qualify. For leases that qualify for this exemption, the Company will not recognize ROU assets or lease liabilities. For lease agreements with lease and non-lease components, the Company will account for each component separately. However, in the case of equipment leases, the Company will account for lease and non-lease components as a single component. Prior to the Company’s adoption of ASU 2016-02, the Company recorded the difference between rent expense recognized on a straight-line basis and the contractual payments as deferred rent. Deferred rent consisted of the following at December 31, 2018: December 31, 2018 Deferred rent $ 1,368 Current maturities of deferred rent (150 ) Deferred rent, less current maturities $ 1,218 Upon adoption of ASU 2016-02 on January 1, 2019, the Company recognized operating lease liabilities of approximately $6.0 million with corresponding ROU assets of approximately $4.6 million. Additionally, the Company derecognized deferred rent liabilities of $1.4 million. Maturities of operating lease liabilities at June 30, 2019 are as follows: Year Operating Leases (In thousands) 2019 (excluding the six months ended June 30, 2019) $ 757 2020 1,396 2021 1,204 2022 1,122 2023 1,093 Thereafter 1,700 Total lease payments 7,272 Less imputed interest (1,453 ) Total lease liabilities $ 5,819 The Company incurred operating lease costs of $0.7 million during the six months ended June 30, 2019. Cash payments related to operating lease liabilities were $0.7 million during the six months ended June 30, 2019. At June 30, 2019, the weighted average remaining lease term for operating leases was 5.8 years. At June 30, 2019, the weighted average discount rate for operating leases was 7.8%. As of June 30, 2019, the Company has additional operating equipment leases with total lease payments of $0.1 million that have not commenced. These operating leases will commence during fiscal year 2019 and have lease terms of four years.

Net Loss Per Share

Net Loss Per Share	6 Months Ended
	Jun. 30, 2019
Earnings Per Share [Abstract]
Net Loss Per Share	(9) Net Loss Per Share The computation of basic and diluted net loss per share consists of the following: Three Months Ended Six Months Ended June 30, June 30, 2019 2018 2019 2018 (In thousands, except share and per share data) Numerator: Net loss $ (5,318 ) $ (6,958 ) $ (11,320 ) $ (13,800 ) Denominator: Weighted average shares outstanding, basic and diluted 24,118,620 23,743,358 24,025,136 23,655,676 Net loss per share, basic and diluted $ (0.22 ) $ (0.29 ) $ (0.47 ) $ (0.58 ) Potentially dilutive common shares that were excluded from the computation of diluted net loss per share because they were anti-dilutive consist of the following: Three Months Ended Six Months Ended June 30, June 30, 2019 2018 2019 2018 Common stock options 3,679,254 3,007,162 3,679,254 3,007,162 Restricted common stock units 1,105,415 949,683 1,105,415 949,683 Restricted common stock awards 128,453 136,187 128,453 136,187 Total 4,913,122 4,093,032 4,913,122 4,093,032 In the table above, anti-dilutive shares consist of those common stock equivalents that have (i) an exercise price above the average stock price for the period or (ii) related average unrecognized stock compensation expense sufficient to buy back the entire amount of shares. The Company excludes the shares issued in connection with restricted stock awards from the calculation of basic weighted average common shares outstanding until the restrictions lapse.

Income Taxes

Income Taxes	6 Months Ended
	Jun. 30, 2019
Income Tax Disclosure [Abstract]
Income Taxes	(10) 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.

Subsequent Events

Subsequent Events	6 Months Ended
	Jun. 30, 2019
Subsequent Events [Abstract]
Subsequent Events	(11) Subsequent Events The Company has evaluated subsequent events through August 1, 2019, the date of issuance of the consolidated financial statements for the three and six months ended June 30, 2019.

Description of Business and B_2

Description of Business and Basis of Presentation (Policies)	6 Months Ended
	Jun. 30, 2019
Accounting Policies [Abstract]
Nature of Business	Nature of Business Aspen Aerogels, Inc. (the Company) is an aerogel technology company that designs, develops and manufactures innovative, high-performance aerogel insulation used primarily in the energy infrastructure and building materials markets. 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 three wholly owned subsidiaries: Aspen Aerogels Rhode Island, LLC, Aspen Aerogels Germany, GmbH and Aspen Aerogels Georgia, LLC.
Liquidity	Liquidity During the six months ended June 30, 2019, the Company incurred a net loss of $11.3 million and used $1.9 million of cash in operations. The Company had a cash and cash equivalents balance of $3.3 million and outstanding borrowing under its revolving line of credit of $2.9 million as of June 30, 2019 (see note 7). After giving effect to outstanding borrowings and letters of credit, the additional amount available to the Company at June 30, 2019 under the revolving line of credit was $6.4 million. The Company is making investments to increase capacity at its existing manufacturing facility in East Providence, Rhode Island and to develop new technologies and business opportunities. The Company expects its existing cash balance and the amount anticipated to be available under the existing revolving line of credit will be sufficient to fund a portion of these investments. The Company plans to manage other capital expenditures and working capital balances to maintain the cash resources required to support current operating requirements and to complete the capacity expansion plan. The Company will need to supplement its cash balance and amounts available under its revolving line of credit with anticipated cash flows from operations, debt financings, customer prepayments, technology licensing agreements or equity financings to provide the capital required to complete the expansion of the existing manufacturing facility and to fund its strategic business initiatives.
Unaudited Interim Financial Information	Unaudited Interim Financial Information The accompanying unaudited interim consolidated financial statements include the accounts of the Company and have been prepared in accordance with accounting principles generally accepted in the United States of America (U.S. GAAP) and with the instructions to Form 10-Q and Article 10 of Regulation S-X. Certain information and disclosures normally included in the consolidated financial statements prepared in accordance with U.S. GAAP have been condensed or omitted pursuant to such rules and regulations. As such, the information included in this Quarterly Report on Form 10-Q should be read in conjunction with the audited consolidated financial statements and accompanying notes in our Annual Report on Form 10-K for the year ended December 31, 2018 (the Annual Report), filed with the Securities and Exchange Commission on March 8, 2019. In the opinion of the Company’s management, the unaudited interim consolidated financial statements have been prepared on the same basis as the audited consolidated financial statements and include all adjustments that are of a normal recurring nature and necessary for the fair statement of the Company’s financial position as of June 30, 2019 and the results of its operations and stockholders’ equity for the six months ended June 30, 2019 and 2018 and the cash flows for the six month periods then ended. The Company has evaluated events through the date of this filing. The results of operations for the three and six months ended June 30, 2019 are not necessarily indicative of the results to be expected for the year ending December 31, 2019 or any other period.
Principles of Consolidation	Principles of Consolidation The accompanying consolidated financial statements, which have been prepared in accordance with U.S. GAAP, include the accounts of the Company and its wholly owned subsidiaries. All intercompany balances and transactions have been eliminated in consolidation.
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, sales returns and allowances, product warranty costs, inventory valuation, the carrying amount of property and equipment, 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 are believed to be reasonable under the circumstances. Management adjusts such estimates and assumptions when facts and circumstances warrant. Illiquid credit markets, volatile equity markets and declines in business investment can 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 and Cash Equivalents	Cash and 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.
Revenue Recognition	Revenue Recognition On January 1, 2018, the Company adopted Accounting Standards Codification 606, Revenue from Contracts with Customers (ASC 606). See note 3 for further details. On January 1, 2018, the Company Adopted Accounting Standards Codification 606, Revenue from Contracts with Customers (ASC 606) using the modified retrospective method for all contracts not completed as of the date of adoption. The adoption of ASC 606 did not have a material impact on the allocation and timing of the recognition of previously reported revenues from the sale of products, subsea projects or the performance of research services. In addition, the Company determined that there are no incremental contract costs or contract fulfillment costs associated with the adoption of ASC 606. The adoption of ASC 606 represents a change in accounting principle that more closely aligns revenue recognition with the delivery of the Company's product or performance of research services and will provide financial statement readers with enhanced disclosures. Revenue Recognition Revenue is recognized when a customer obtains control of promised goods or services in an amount that reflects the consideration which the entity expects to receive in exchange for those goods or services. To determine revenue recognition for arrangements within the scope of ASC 606, the Company performs the following five steps: (i) identification of the contract with a customer; (ii) identification of the performance obligations in the contract; (iii) determination of the transaction price; (iv) allocation of the transaction price to the separate performance obligations in the contract; and (v) recognition of the revenue associated with performance obligations as they are satisfied. The Company applies the five-step model to contracts when it is probable that the Company will collect the consideration it is entitled to in exchange for the goods or services it transfers to the customer. At contract inception, once the contract is determined to be within the scope of ASC 606, the Company assesses the goods or services promised within each contract and determines those that are performance obligations, and assesses whether each promised good or service is distinct. If the contract contains a single performance obligation, the entire transaction price is allocated to the single performance obligation. Contracts that contain multiple performance obligations require an allocation of the transaction price based on the estimated relative standalone selling prices of the promised products or services underlying each performance obligation. The Company determines standalone selling prices based on the price at which the performance obligation is sold separately. If the standalone selling price is not observable through past transactions, the Company estimates the standalone selling price taking into account available information such as market conditions and internally approved pricing guidelines related to the performance obligations. The Company then recognizes as revenue the amount of the transaction price that is allocated to the respective performance obligation when (or as) the performance obligation is satisfied. When determining the transaction price of a contract, an adjustment is made if payment from a customer occurs either significantly before or significantly after performance, resulting in a significant financing component. Applying the practical expedient in paragraph ASC 606-10-32-18, the Company does not assess whether a significant financing component exists if the period between when the Company performs its obligations under the contract and when the customer pays is one year or less. The Company did not have any contracts outstanding at December 31, 2018 and did not enter into any contracts during the six months ended June 30, 2019 that contained a significant financing component. 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 the completion of required performance obligations. Shipping and Handling Costs Shipping and handling costs associated with outbound freight after control over a product has transferred to a customer are accounted for as fulfillment costs and are included in the cost of product revenue. The amount of revenue recognized reflects the consideration to which the Company expects to be entitled to receive in exchange for these products or research services. Product Revenue The Company generally enters into contracts containing one type of performance obligation. The Company recognizes product revenue when the performance obligation is satisfied, which is generally upon delivery according to contractual shipping terms within customer purchase orders. The Company also enters into rebate agreements with certain customers. These agreements may be considered an additional performance obligation of the Company or variable consideration within a contract. Rebates are recorded as a reduction of revenue in the period the related product revenue is recognized. A corresponding liability is recorded as a component of deferred revenue on the consolidated balance sheets. These arrangements are primarily based on the customer attaining contractually specified sales volumes. The Company estimates the amount of its product sales that may be returned by its customers and records this estimate as a reduction of revenue in the period the related product revenue is recognized. The Company currently estimates product return liabilities using historical rates of return, current quarter credit sales, and specific items of exposure on a contract by contract basis. Sales return reserves were approximately $0.1 million at both June 30, 2019 and December 31, 2018. Subsea Projects The Company manufactures and sells subsea products that are designed for pipe-in-pipe applications in offshore oil production and are typically customized to meet customer specifications. Subsea products typically have no alternative use and contain an enforceable right to payment. Customer invoicing terms for subsea products are typically based on certain milestones within the production and delivery schedule. Under the provisions of ASC 606, the Company recognizes revenue at a point in time when transfer of control of the products is passed to the customer, or , Research Services The Company performs research services under contracts with various government agencies and other institutions. These contracts generally have one type of performance obligation associated with the provision of research services including functional licenses to any resulting intellectual property. The Company records revenue 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; and (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 under the Company’s research service contracts is the labor effort expended in completing the research, and typically the only deliverable, other than the labor hours expended, is the 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 toward 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. 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 within the period they become known. To date, adjustments to revenue as a result of contracting agency audits have been insignificant
Leases	Leases On January 1, 2019, the Company adopted Accounting Standards Update (ASU) 2016-02, Leases (Topic 842) . See note 8 for further details. On January 1, 2019, the Company adopted ASU 2016-02 which modifies the accounting for leases and requires that all leases be recorded on the consolidated balance sheets as assets and liabilities. The Company adopted this standard using the modified retrospective transition approach with the effective date as the date of initial application. As a result, the Company did not update financial information or provide the disclosures otherwise required under the new standard for dates and periods before January 1, 2019. The Company also elected the package of practical expedients under the new standard, which permits the Company to not reassess prior conclusions about lease identification, lease classification, and initial direct costs. In addition, the Company elected the short-term lease recognition exemption under which the Company will not recognize ROU assets or lease liabilities for all leases that qualify. The Company also elected the practical expedient to not separate non-lease components from the associated lease components for all of its equipment leases. The Company determines if an arrangement is a lease at inception. ROU assets represent the Company’s right to use an underlying asset for the lease term and lease liabilities represent the Company’s payment obligations under the lease. Operating lease ROU assets and liabilities are recognized based on the present value of lease payments over the lease term. To measure its lease liabilities, the Company uses its incremental borrowing rate or the rate implicit in the lease, if available. ROU assets also include any direct costs and prepaid lease payments but exclude any lease incentives received. The Company’s lease terms may include options to extend or terminate the lease when it is reasonably certain that the Company will exercise that option. Lease expense for lease payments is recognized on a straight-line basis over the lease term. The Company elected the short-term lease recognition exemption for all leases that qualify. For leases that qualify for this exemption, the Company will not recognize ROU assets or lease liabilities. For lease agreements with lease and non-lease components, the Company will account for each component separately. However, in the case of equipment leases, the Company will account for lease and non-lease components as a single component.
Stock-based Compensation	Stock-based Compensation Stock-based compensation expense 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. The fair value of awards containing market conditions is determined using a Monte Carlo simulation model based upon the nature of the conditions, the expected volatility of the underlying security, and other relevant factors. During the six months ended June 30, 2019, the Company granted 50,328 shares of restricted common stock with a grant date fair value of $0.3 million and non-qualified options (NSOs) to purchase 71,700 shares of common stock with a grant date fair value of $0.2 million vesting over a period of one year to its non-employee directors under the 2014 Employee, Director, and Consultant Equity Incentive Plan (the 2014 Equity Plan). six months ended June 30, 2019, the Company also granted 654,582 restricted common stock units (RSUs) with a grant date fair value of $2.4 million and NSOs to purchase 632,183 shares of common stock with a grant date fair value of $1.1 million to employees under the 2014 Equity Plan. The RSUs and NSOs granted to employees will vest over a three year period. Stock-based compensation is included in cost of revenue or operating expenses, as applicable, and consists of the following: Three Months Ended Six Months Ended June 30, June 30, 2019 2018 2019 2018 (In thousands) Cost of product revenue $ 123 $ 162 $ 240 $ 316 Research and development expenses 130 120 244 231 Sales and marketing expenses 164 209 293 441 General and administrative expenses 579 659 1,097 1,298 Total stock-based compensation $ 996 $ 1,150 $ 1,874 $ 2,286 Pursuant to the “evergreen” provisions of the 2014 Equity Plan, the number of shares of common stock authorized for issuance under the plan automatically increased by 479,470 shares to 7,488,930 shares effective January 1, 2019. As of June 30, 2019, 4,697,434 shares of common stock were reserved for issuance upon the exercise or vesting of outstanding stock-based awards granted under the 2014 Equity Plan. In addition, as of June 30, 2019, 87,235 shares of common stock were reserved for issuance upon the exercise of outstanding stock options granted under the Company’s 2001 Equity Incentive Plan, as amended (the 2001 Equity Plan). Any cancellations or forfeitures of the options outstanding under the 2001 Equity Plan will result in the shares reserved for issuance upon exercise of such options becoming available for grant under the 2014 Equity Plan. As of June 30, 2019, the Company has either issued or reserved in connection with statutory tax withholdings a total of 1,782,795 shares under the 2014 Equity Plan. As of June 30, 2019, there were 921,466 shares of common stock available for future grant under the 2014 Equity Plan.
Net Loss per Share	Net Loss per Share The Company calculates net 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 loss gives effect to all potentially dilutive common equivalent shares, including outstanding stock options, and RSUs. Common equivalent shares are excluded from the computation of diluted net loss per share if their effect is antidilutive.
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 total revenues, based on shipment destination or services location, is presented in the following table: Three Months Ended Six Months Ended June 30, June 30, 2019 2018 2019 2018 (In thousands) Revenue: U.S. $ 14,972 $ 9,310 $ 26,224 $ 19,192 International 14,561 12,361 31,221 25,553 Total $ 29,533 $ 21,671 $ 57,445 $ 44,745
Warranty	Warranty The Company provides warranties for its products and records the estimated cost within cost of revenue in the period that the related revenue is recorded. The Company’s standard warranty period extends to one year from the date of shipment. This standard warranty provides 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. The Company’s products may be utilized in systems that involve new technical demands and new configurations. Accordingly, the Company regularly reviews and assesses whether warranty reserves should be recorded in the period the related revenue is recorded. For an initial shipment of product for use in a system with new technical demands or new configurations and where the Company is unsure of meeting the customer’s specifications, the Company will defer the recognition of product revenue and related costs until written customer acceptance is obtained. The Company performs periodic testing of its aerogel blankets to ensure compliance with published performance specifications. From time to time, tests may indicate a product could potentially perform outside of these specifications. At that time, additional testing is initiated or the Company may conduct a root cause investigation. During the year ended December 31, 2018, test results indicated that tested samples performed outside the published performance specifications for a specific attribute of a product. The Company has completed its assessment of the impact of the testing results on its customer base and, based on that completed assessment, has determined that it is remote that the Company has incurred a liability as of June 30, 2019 The Company did not record any warranty expense during the six months ended June 30, 2019 and 2018. As of June 30, 2019, the Company had satisfied all warranty claims.
Recently Issued Accounting Standards	Recently Issued Accounting Standards From time to time, new accounting pronouncements are issued by the Financial Accounting Standards Board (FASB) or other standard setting bodies. Recently issued standards typically do not require adoption until a future effective date. Prior to their effective date, the Company evaluates the pronouncements to determine the potential effects of adoption to its consolidated financial statements. Standards Implemented Since December 31, 2018 In February 2016, the FASB issued ASU 2016-02, Leases (Topic 842) . FASB ASU 2016-02 modifies the accounting for leases and requires that all leases be recorded on the consolidated balance sheets as assets and liabilities. This standard is effective for fiscal years beginning after December 15, 2018. Standards to be Implemented The Company believes that the impact of recently issued accounting standards that are not yet effective will not have a material impact on its consolidated financial statements.

Significant Accounting Polici_2

Significant Accounting Policies (Tables)	6 Months Ended
	Jun. 30, 2019
Accounting Policies [Abstract]
Summary of Stock Based Compensation Included in Cost of Revenue or Operating Expenses	Stock-based compensation is included in cost of revenue or operating expenses, as applicable, and consists of the following: Three Months Ended Six Months Ended June 30, June 30, 2019 2018 2019 2018 (In thousands) Cost of product revenue $ 123 $ 162 $ 240 $ 316 Research and development expenses 130 120 244 231 Sales and marketing expenses 164 209 293 441 General and administrative expenses 579 659 1,097 1,298 Total stock-based compensation $ 996 $ 1,150 $ 1,874 $ 2,286
Schedule of Revenues, Based on Shipment Destination or Research Services Location	Information about the Company’s total revenues, based on shipment destination or services location, is presented in the following table: Three Months Ended Six Months Ended June 30, June 30, 2019 2018 2019 2018 (In thousands) Revenue: U.S. $ 14,972 $ 9,310 $ 26,224 $ 19,192 International 14,561 12,361 31,221 25,553 Total $ 29,533 $ 21,671 $ 57,445 $ 44,745

Revenue from Contracts with C_2

Revenue from Contracts with Customers (Tables)	6 Months Ended
	Jun. 30, 2019
Revenue From Contract With Customer [Abstract]
Summary of Revenue Disaggregated by Geographical Region and Source of Revenue	In the following tables, revenue is disaggregated by primary geographical region and source of revenue: Three Months Ended June 30, 2019 2018 U.S. International Total U.S. International Total (In thousands) Geographical region Asia $ — $ 7,786 $ 7,786 $ — $ 7,673 $ 7,673 Canada — 9 9 — 596 596 Europe — 5,864 5,864 — 3,411 3,411 Latin America — 902 902 — 681 681 U.S. 14,972 — 14,972 9,310 — 9,310 Total revenue $ 14,972 $ 14,561 $ 29,533 $ 9,310 $ 12,361 $ 21,671 Source of revenue Product revenue $ 10,790 $ 10,334 $ 21,124 $ 8,754 $ 12,361 $ 21,115 Subsea projects 3,557 4,227 7,784 — — — Research services 625 — 625 556 — 556 Total revenue $ 14,972 $ 14,561 $ 29,533 $ 9,310 $ 12,361 $ 21,671 Six Months Ended June 30, 2019 2018 U.S. International Total U.S. International Total (In thousands) Geographical region Asia $ — $ 14,509 $ 14,509 $ — $ 15,901 $ 15,901 Canada — 1,906 1,906 — 2,271 2,271 Europe — 12,987 12,987 — 5,866 5,866 Latin America — 1,819 1,819 — 1,515 1,515 U.S. 26,224 — 26,224 19,192 — 19,192 Total revenue $ 26,224 $ 31,221 $ 57,445 $ 19,192 $ 25,553 $ 44,745 Source of revenue Product revenue $ 20,915 $ 22,299 $ 43,214 $ 18,078 $ 24,714 $ 42,792 Subsea projects 3,557 8,922 12,479 5 839 844 Research services 1,752 — 1,752 1,109 — 1,109 Total revenue $ 26,224 $ 31,221 $ 57,445 $ 19,192 $ 25,553 $ 44,745
Summary of Changes in Contract Assets and Contract Liabilities	The following table presents changes in the Company’s contract assets and contract liabilities during the six months ended June 30, 2019: Balance at December 31, 2018 Additions Deductions Balance at June 30, 2019 (In thousands) Contract assets Subsea projects $ 2,742 $ 17,923 $ (15,062 ) $ 5,603 Research services 369 1,482 (904 ) 947 Total contract assets $ 3,111 $ 19,405 $ (15,966 ) $ 6,550 Contract liabilities Deferred revenue Product revenue $ 1,751 $ 8,356 $ (1,764 ) $ 8,343 Subsea projects 781 6,379 (6,910 ) 250 Research services 97 212 (45 ) 264 Prepayment liability 4,485 5,353 (54 ) 9,784 Total contract liabilities $ 7,114 $ 20,300 $ (8,773 ) $ 18,641

Inventories (Tables)

Inventories (Tables)	6 Months Ended
	Jun. 30, 2019
Inventory Disclosure [Abstract]
Schedule of Inventories	Inventories consist of the following: June 30, December 31, 2019 2018 (In thousands) Raw materials $ 4,488 $ 3,159 Finished goods 8,611 4,159 Total $ 13,099 $ 7,318

Property, Plant and Equipment_2

Property, Plant and Equipment, Net (Tables)	6 Months Ended
	Jun. 30, 2019
Property Plant And Equipment [Abstract]
Summary of Property, Plant and Equipment	Property, plant and equipment consist of the following: June 30, December 31, Useful 2019 2018 life (In thousands) Construction in progress $ 150 $ 1,568 — Buildings 24,016 24,016 30 years Machinery and equipment 122,286 120,466 3-10 years Computer equipment and software 8,540 8,352 3 years Total 154,992 154,402 Accumulated depreciation (97,673 ) (92,703 ) Property, plant and equipment, net $ 57,319 $ 61,699

Accrued Expenses (Tables)

Accrued Expenses (Tables)	6 Months Ended
	Jun. 30, 2019
Payables And Accruals [Abstract]
Schedule of Accrued Expenses	Accrued expenses consist of the following: June 30, December 31, 2019 2018 (In thousands) Employee compensation $ 2,848 $ 2,750 Other accrued expenses 1,197 1,114 Total $ 4,045 $ 3,864

Leases (Tables)

Leases (Tables)	6 Months Ended
	Jun. 30, 2019
Leases [Abstract]
Summary of Deferred Rent	Deferred rent consisted of the following at December 31, 2018: December 31, 2018 Deferred rent $ 1,368 Current maturities of deferred rent (150 ) Deferred rent, less current maturities $ 1,218
Summary of Maturities of Operating Lease Liabilities	Maturities of operating lease liabilities at June 30, 2019 are as follows: Year Operating Leases (In thousands) 2019 (excluding the six months ended June 30, 2019) $ 757 2020 1,396 2021 1,204 2022 1,122 2023 1,093 Thereafter 1,700 Total lease payments 7,272 Less imputed interest (1,453 ) Total lease liabilities $ 5,819

Net Loss Per Share (Tables)

Net Loss Per Share (Tables)	6 Months Ended
	Jun. 30, 2019
Earnings Per Share [Abstract]
Computation of Basic and Diluted Net Loss Per Share	The computation of basic and diluted net loss per share consists of the following: Three Months Ended Six Months Ended June 30, June 30, 2019 2018 2019 2018 (In thousands, except share and per share data) Numerator: Net loss $ (5,318 ) $ (6,958 ) $ (11,320 ) $ (13,800 ) Denominator: Weighted average shares outstanding, basic and diluted 24,118,620 23,743,358 24,025,136 23,655,676 Net loss per share, basic and diluted $ (0.22 ) $ (0.29 ) $ (0.47 ) $ (0.58 )
Summary of Potentially Dilutive Common Shares Excluded from Computation of Diluted Net Loss Per Share	Potentially dilutive common shares that were excluded from the computation of diluted net loss per share because they were anti-dilutive consist of the following: Three Months Ended Six Months Ended June 30, June 30, 2019 2018 2019 2018 Common stock options 3,679,254 3,007,162 3,679,254 3,007,162 Restricted common stock units 1,105,415 949,683 1,105,415 949,683 Restricted common stock awards 128,453 136,187 128,453 136,187 Total 4,913,122 4,093,032 4,913,122 4,093,032

Description of Business and B_3

Description of Business and Basis of Presentation - Additional Information (Detail) $ in Thousands	3 Months Ended				6 Months Ended
	Jun. 30, 2019USD ($)	Mar. 31, 2019USD ($)	Jun. 30, 2018USD ($)	Mar. 31, 2018USD ($)	Jun. 30, 2019USD ($)Subsidiary	Jun. 30, 2018USD ($)	Dec. 31, 2018USD ($)
Basis Of Presentation [Line Items]
Number of Subsidiaries | Subsidiary					3
Net loss incurred	$ 5,318	$ 6,002	$ 6,958	$ 6,842	$ 11,320	$ 13,800
Cash used in operations					1,943	$ 6,247
Cash and cash equivalents	3,322				3,322		$ 3,327
Outstanding borrowings under revolving line of credit	2,885				2,885		$ 4,181
Revolving Credit Facility [Member]
Basis Of Presentation [Line Items]
Outstanding borrowings under revolving line of credit	2,900				2,900
Additional amount available under revolving line of credit	$ 6,400				$ 6,400
Existing maturity date					Apr. 28, 2020

Significant Accounting Polici_3

Significant Accounting Policies - Additional Information (Detail)	Jan. 01, 2019USD ($)shares	Jun. 30, 2019USD ($)Segmentshares	Jun. 30, 2018USD ($)
Summary Of Significant Accounting Policies [Line Items]
Number of segment | Segment		1
Standard product warranty period		1 year
Warranty expense		$ 0	$ 0
Operating lease liabilities	$ 6,000,000	5,819,000
ROU assets	4,600,000	$ 4,461,000
Deferred rent credit de-recognized	1,400,000
ASU 2016-02 [Member]
Summary Of Significant Accounting Policies [Line Items]
Operating lease liabilities	6,000,000
ROU assets	4,600,000
Deferred rent credit de-recognized	$ 1,400,000
2014 Equity Plan [Member]
Summary Of Significant Accounting Policies [Line Items]
Authorized for issuance, number of shares increased by | shares	479,470
Increased number of shares authorized for grant | shares	7,488,930
Shares reserved for issuance | shares		4,697,434
Number of shares either issued or reserved in connection with statutory tax withholdings | shares		1,782,795
Increased number of shares available for grant | shares		921,466
2014 Equity Plan [Member] | Non-Qualified Stock Options [Member]
Summary Of Significant Accounting Policies [Line Items]
Stock-based awards granted to purchase common stock | shares		632,183
Stock-based awards granted to purchase common stock, grant date fair value		$ 1,100,000
Stock-based award vesting period		3 years
2014 Equity Plan [Member] | Restricted Stock Units [Member]
Summary Of Significant Accounting Policies [Line Items]
Stock-based awards granted to purchase common stock | shares		654,582
Stock-based awards granted to purchase common stock, grant date fair value		$ 2,400,000
Stock-based award vesting period		3 years
2014 Equity Plan [Member] | Non-Employee Directors [Member] | Restricted Common Stock [Member]
Summary Of Significant Accounting Policies [Line Items]
Stock-based awards granted to purchase common stock | shares		50,328
Stock-based awards granted to purchase common stock, grant date fair value		$ 300,000
Stock-based award vesting period		1 year
2014 Equity Plan [Member] | Non-Employee Directors [Member] | Non-Qualified Stock Options [Member]
Summary Of Significant Accounting Policies [Line Items]
Stock-based awards granted to purchase common stock | shares		71,700
Stock-based awards granted to purchase common stock, grant date fair value		$ 200,000
Stock-based award vesting period		1 year
2001 Equity Incentive Plan [Member]
Summary Of Significant Accounting Policies [Line Items]
Shares reserved for issuance | shares		87,235

Significant Accounting Polici_4

Significant Accounting Policies - Summary of Stock Based Compensation Included in Cost of Revenue or Operating Expenses (Detail) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2019	Jun. 30, 2018	Jun. 30, 2019	Jun. 30, 2018
Share-based Compensation Arrangement by Share-based Payment Award, Compensation Cost [Line Items]
Total stock-based compensation	$ 996	$ 1,150	$ 1,874	$ 2,286
Cost of Product Revenue [Member]
Share-based Compensation Arrangement by Share-based Payment Award, Compensation Cost [Line Items]
Total stock-based compensation	123	162	240	316
Research and Development Expenses [Member]
Share-based Compensation Arrangement by Share-based Payment Award, Compensation Cost [Line Items]
Total stock-based compensation	130	120	244	231
Sales and Marketing Expenses [Member]
Share-based Compensation Arrangement by Share-based Payment Award, Compensation Cost [Line Items]
Total stock-based compensation	164	209	293	441
General and Administrative Expenses [Member]
Share-based Compensation Arrangement by Share-based Payment Award, Compensation Cost [Line Items]
Total stock-based compensation	$ 579	$ 659	$ 1,097	$ 1,298

Significant Accounting Polici_5

Significant Accounting Policies - Schedule of Revenues, Based on Shipment Destination or Research Services Location (Detail) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2019	Jun. 30, 2018	Jun. 30, 2019	Jun. 30, 2018
Segment Reporting Information [Line Items]
Revenue	$ 29,533	$ 21,671	$ 57,445	$ 44,745
U.S. [Member]
Segment Reporting Information [Line Items]
Revenue	14,972	9,310	26,224	19,192
International [Member]
Segment Reporting Information [Line Items]
Revenue	$ 14,561	$ 12,361	$ 31,221	$ 25,553

Revenue from Contracts with C_3

Revenue from Contracts with Customers - Additional Information (Details) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2019USD ($)	Jun. 30, 2018USD ($)	Jun. 30, 2019USD ($)Agreement	Jun. 30, 2018USD ($)	Dec. 31, 2018USD ($)
Revenue Recognition [Line Items]
Revenue	$ 29,533	$ 21,671	$ 57,445	$ 44,745
Deferred revenue, revenue recognized			1,400
Maximum [Member]
Revenue Recognition [Line Items]
Sales return reserves	100		$ 100		$ 100
Product Revenue [Member]
Revenue Recognition [Line Items]
Number of peformance obligations | Agreement			1
Revenue	21,124	21,115	$ 43,214	42,792
Subsea Projects [Member]
Revenue Recognition [Line Items]
Revenue	7,784		$ 12,479	844
Research Services [Member]
Revenue Recognition [Line Items]
Number of peformance obligations | Agreement			1
Revenue	$ 625	$ 556	$ 1,752	$ 1,109

Revenue from Contracts with C_4

Revenue from Contracts with Customers - Summary of Revenue Disaggregated by Geographical Region and Source of Revenue (Detail) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2019	Jun. 30, 2018	Jun. 30, 2019	Jun. 30, 2018
Disaggregation Of Revenue [Line Items]
Total revenue	$ 29,533	$ 21,671	$ 57,445	$ 44,745
Product Revenue [Member]
Disaggregation Of Revenue [Line Items]
Total revenue	21,124	21,115	43,214	42,792
Subsea Projects [Member]
Disaggregation Of Revenue [Line Items]
Total revenue	7,784		12,479	844
Research Services [Member]
Disaggregation Of Revenue [Line Items]
Total revenue	625	556	1,752	1,109
Asia [Member]
Disaggregation Of Revenue [Line Items]
Total revenue	7,786	7,673	14,509	15,901
Canada [Member]
Disaggregation Of Revenue [Line Items]
Total revenue	9	596	1,906	2,271
Europe [Member]
Disaggregation Of Revenue [Line Items]
Total revenue	5,864	3,411	12,987	5,866
Latin America [Member]
Disaggregation Of Revenue [Line Items]
Total revenue	902	681	1,819	1,515
U.S. [Member]
Disaggregation Of Revenue [Line Items]
Total revenue	14,972	9,310	26,224	19,192
U.S. [Member] | Product Revenue [Member]
Disaggregation Of Revenue [Line Items]
Total revenue	10,790	8,754	20,915	18,078
U.S. [Member] | Subsea Projects [Member]
Disaggregation Of Revenue [Line Items]
Total revenue	3,557		3,557	5
U.S. [Member] | Research Services [Member]
Disaggregation Of Revenue [Line Items]
Total revenue	625	556	1,752	1,109
International [Member]
Disaggregation Of Revenue [Line Items]
Total revenue	14,561	12,361	31,221	25,553
International [Member] | Product Revenue [Member]
Disaggregation Of Revenue [Line Items]
Total revenue	10,334	$ 12,361	22,299	24,714
International [Member] | Subsea Projects [Member]
Disaggregation Of Revenue [Line Items]
Total revenue	$ 4,227		$ 8,922	$ 839

Revenue from Contracts with C_5

Revenue from Contracts with Customers - Summary of Changes in Contract Assets and Contract Liabilities (Detail) $ in Thousands	6 Months Ended
	Jun. 30, 2019USD ($)
Contract assets
Beginning Balance	$ 3,111
Additions	19,405
Deductions	(15,966)
Ending Balance	6,550
Contract liabilities
Beginning Balance	7,114
Additions	20,300
Deductions	(8,773)
Ending Balance	18,641
Subsea Projects [Member]
Contract assets
Beginning Balance	2,742
Additions	17,923
Deductions	(15,062)
Ending Balance	5,603
Contract liabilities
Beginning Balance	781
Additions	6,379
Deductions	(6,910)
Ending Balance	250
Research Services [Member]
Contract assets
Beginning Balance	369
Additions	1,482
Deductions	(904)
Ending Balance	947
Contract liabilities
Beginning Balance	97
Additions	212
Deductions	(45)
Ending Balance	264
Product Revenue [Member]
Contract liabilities
Beginning Balance	1,751
Additions	8,356
Deductions	(1,764)
Ending Balance	8,343
Prepayment Liability [Member]
Contract liabilities
Beginning Balance	4,485
Additions	5,353
Deductions	(54)
Ending Balance	$ 9,784

Inventories - Schedule of Inven

Inventories - Schedule of Inventories (Detail) - USD ($) $ in Thousands	Jun. 30, 2019	Dec. 31, 2018
Inventory Disclosure [Abstract]
Raw materials	$ 4,488	$ 3,159
Finished goods	8,611	4,159
Total	$ 13,099	$ 7,318

Property, Plant and Equipment_3

Property, Plant and Equipment, Net - Summary of Property, Plant and Equipment (Detail) - USD ($) $ in Thousands	6 Months Ended
	Jun. 30, 2019	Dec. 31, 2018
Property Plant and Equipment [Line Items]
Property, plant and equipment, gross	$ 154,992	$ 154,402
Accumulated depreciation	(97,673)	(92,703)
Property, plant and equipment, net	57,319	61,699
Construction in Progress [Member]
Property Plant and Equipment [Line Items]
Property, plant and equipment, gross	150	1,568
Buildings [Member]
Property Plant and Equipment [Line Items]
Property, plant and equipment, gross	$ 24,016	24,016
Property, plant and equipment, Useful life	30 years
Machinery and Equipment [Member]
Property Plant and Equipment [Line Items]
Property, plant and equipment, gross	$ 122,286	120,466
Machinery and Equipment [Member] | Minimum [Member]
Property Plant and Equipment [Line Items]
Property, plant and equipment, Useful life	3 years
Machinery and Equipment [Member] | Maximum [Member]
Property Plant and Equipment [Line Items]
Property, plant and equipment, Useful life	10 years
Computer Equipment and Software [Member]
Property Plant and Equipment [Line Items]
Property, plant and equipment, gross	$ 8,540	$ 8,352
Property, plant and equipment, Useful life	3 years

Property, Plant and Equipment_4

Property, Plant and Equipment, Net - Additional Information (Detail) - USD ($) $ in Thousands	6 Months Ended
	Jun. 30, 2019	Jun. 30, 2018	Dec. 31, 2018
Property Plant and Equipment [Line Items]
Depreciation expense	$ 5,100	$ 5,700
Property, plant and equipment, gross	154,992		$ 154,402
Construction in Progress [Member]
Property Plant and Equipment [Line Items]
Property, plant and equipment, gross	150		1,568
Rhode Island [Member] | Construction in Progress [Member]
Property Plant and Equipment [Line Items]
Property, plant and equipment, gross			$ 1,200
Rhode Island [Member] | Maximum [Member] | Construction in Progress [Member]
Property Plant and Equipment [Line Items]
Property, plant and equipment, gross	$ 100

Accrued Expenses - Schedule of

Accrued Expenses - Schedule of Accrued Expenses (Detail) - USD ($) $ in Thousands	Jun. 30, 2019	Dec. 31, 2018
Accrued Liabilities Current [Abstract]
Employee compensation	$ 2,848	$ 2,750
Other accrued expenses	1,197	1,114
Total	$ 4,045	$ 3,864

Commitments and Contingencies -

Commitments and Contingencies - Additional Information (Detail) - USD ($)	Mar. 04, 2019	Jan. 30, 2019	Jun. 30, 2019	Jun. 30, 2018	Dec. 31, 2018
Commitments And Contingencies [Line Items]
Prepayment proceeds under customer supply agreement, net			$ 5,000,000	$ 5,000,000
Line of credit facility amount withdrawn			$ 2,885,000		$ 4,181,000
Silicon Valley Bank Credit Facility [Member] | Loan Agreement [Member]
Commitments And Contingencies [Line Items]
Maximum increased borrowing amount	$ 20,000,000
Interest rate description			the interest rate applicable to borrowings under the revolving credit facility may be based on the prime rate or LIBOR. Prime rate-based rates vary from prime rate plus 0.75% per annum to prime rate plus 2.00% per annum, while LIBOR-based rates vary from LIBOR plus 3.75% per annum to LIBOR plus 4.25% per annum.
Percentage of unused portion of facility, monthly fee	0.50%
Revolving Credit Facility [Member]
Commitments And Contingencies [Line Items]
Extended maturity date			Apr. 28, 2020
Line of credit facility amount withdrawn			$ 2,900,000
Available borrowing capacity			6,400,000
Revolving Credit Facility [Member] | Silicon Valley Bank Credit Facility [Member] | Loan Agreement [Member]
Commitments And Contingencies [Line Items]
Extended maturity date	Apr. 28, 2020
Line of credit facility amount withdrawn			2,900,000		4,200,000
Letters of credit outstanding			600,000		1,600,000
Available borrowing capacity			$ 6,400,000
Maximum [Member] | Silicon Valley Bank Credit Facility [Member] | Loan Agreement [Member] | Prime Rate [Member]
Commitments And Contingencies [Line Items]
Additional interest rate per annum	2.00%
Maximum [Member] | Silicon Valley Bank Credit Facility [Member] | Loan Agreement [Member] | LIBOR Rate [Member]
Commitments And Contingencies [Line Items]
Additional interest rate per annum	4.25%
Minimum [Member] | Silicon Valley Bank Credit Facility [Member] | Loan Agreement [Member] | Prime Rate [Member]
Commitments And Contingencies [Line Items]
Additional interest rate per annum	0.75%
Minimum [Member] | Silicon Valley Bank Credit Facility [Member] | Loan Agreement [Member] | LIBOR Rate [Member]
Commitments And Contingencies [Line Items]
Additional interest rate per annum	3.75%
Supply and Joint Development Agreement Amended [Member] | BASF [Member]
Commitments And Contingencies [Line Items]
Supply agreement termination date			Dec. 31, 2027
Prepayment liability					$ 5,000,000
Prepayment proceeds under customer supply agreement, net			$ 10,000,000
Prepayment liability, net of current portion			200,000
Supply and Joint Development Agreement Amended [Member] | BASF [Member] | Maximum [Member]
Commitments And Contingencies [Line Items]
Non-interest bearing prepayments, aggregate amount			$ 22,000,000
Credit limit percentage on prepayment balance			25.30%
Credits against amounts invoiced			$ 100,000
Supply and Joint Development Agreement Addendum [Member] | BASF [Member]
Commitments And Contingencies [Line Items]
Prepayment liability		$ 5,000,000
Supply and Joint Development Agreement Addendum [Member] | BASF [Member] | After January 1, 2020 [Member]
Commitments And Contingencies [Line Items]
Credit limit percentage on prepayment balance		50.00%
Supply and Joint Development Agreement Addendum [Member] | BASF [Member] | After December 31, 2022 [Member]
Commitments And Contingencies [Line Items]
Credit limit percentage on prepayment balance		24.70%

Leases - Additional Information

Leases - Additional Information (Detail) - USD ($) $ in Thousands	6 Months Ended
	Jun. 30, 2019	Jan. 01, 2019
Leases [Abstract]
Operating lease expiry year	2026
Operating lease liabilities	$ 5,819	$ 6,000
ROU assets	4,461	4,600
Deferred rent credit de-recognized		$ 1,400
Operating lease cost	700
Cash payments related to operating lease liabilities	$ 700
Operating lease, weighted average remaining lease term	5 years 9 months 18 days
Operating lease, weighted average discount rate, percent	7.80%
Operating lease liability payments not yet commenced	$ 100
Operating lease not yet commenced, term	4 years

Leases - Summary of Deferred Re

Leases - Summary of Deferred Rent (Detail) $ in Thousands	Dec. 31, 2018USD ($)
Deferred Revenue And Credits [Abstract]
Deferred rent	$ 1,368
Current maturities of deferred rent	(150)
Deferred rent, less current maturities	$ 1,218

Leases - Summary of Maturities

Leases - Summary of Maturities of Operating Lease Liabilities (Detail) - USD ($) $ in Thousands	Jun. 30, 2019	Jan. 01, 2019
Leases [Abstract]
2019 (excluding the six months ended June 30, 2019)	$ 757
2020	1,396
2021	1,204
2022	1,122
2023	1,093
Thereafter	1,700
Total lease payments	7,272
Less imputed interest	(1,453)
Operating lease liabilities	$ 5,819	$ 6,000

Net Loss Per Share - Computatio

Net Loss Per Share - Computation of Basic and Diluted Net Loss Per Share (Detail) - USD ($) $ / shares in Units, $ in Thousands	3 Months Ended				6 Months Ended
	Jun. 30, 2019	Mar. 31, 2019	Jun. 30, 2018	Mar. 31, 2018	Jun. 30, 2019	Jun. 30, 2018
Numerator:
Net loss	$ (5,318)	$ (6,002)	$ (6,958)	$ (6,842)	$ (11,320)	$ (13,800)
Denominator:
Weighted average shares outstanding, basic and diluted	24,118,620		23,743,358		24,025,136	23,655,676
Net loss per share, basic and diluted	$ (0.22)		$ (0.29)		$ (0.47)	$ (0.58)

Net Loss Per Share - Summary of

Net Loss Per Share - Summary of Potentially Dilutive Common Shares Excluded from Computation of Diluted Net Loss Per Share (Detail) - shares	3 Months Ended		6 Months Ended
	Jun. 30, 2019	Jun. 30, 2018	Jun. 30, 2019	Jun. 30, 2018
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items]
Anti-dilutive Securities	4,913,122	4,093,032	4,913,122	4,093,032
Common Stock Options [Member]
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items]
Anti-dilutive Securities	3,679,254	3,007,162	3,679,254	3,007,162
Restricted Common Stock Units [Member]
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items]
Anti-dilutive Securities	1,105,415	949,683	1,105,415	949,683
Restricted Common Stock Awards [Member]
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items]
Anti-dilutive Securities	128,453	136,187	128,453	136,187