Description of Business - Additional Information (Detail)		12 Months Ended
	Aug. 24, 2021 USD ($)	Dec. 31, 2021 USD ($) Subsidiary	Dec. 31, 2020 USD ($)	Dec. 31, 2019 USD ($)	May 01, 2020 USD ($)
Basis Of Presentation [Line Items]
Number of Subsidiaries | Subsidiary		3
Net loss incurred		$ 37,094,000	$ 21,809,000	$ 14,565,000
Cash used in operations		18,628,000	9,924,000	$ 1,054,000
Cash for capital expenditures		13,800,000
Proceeds from issuance of private placement, net		73,500,000
Cash and cash equivalents		76,564,000	16,496,000
Current portion of prepayment liability		4,728,000
Gain on extinguishment of debt		3,734,000
Aspen Aerogels Rhode Island, LLC [Member] | Paycheck Protection Program Loan
Basis Of Presentation [Line Items]
Debt instrument, principal amount					$ 3,700,000
Principal Forgiveness [Member] | Paycheck Protection Program Loan
Basis Of Presentation [Line Items]
Debt instrument, principal amount	$ 3,700,000
Gain on extinguishment of debt		$ 3,700,000
Loan forgiveness description		On August 24, 2021, the SBA remitted $3.7 million in principal and less than $0.1 million in accrued interest to the noteholder after approving the Borrower’s application for forgiveness of the loan under the provisions of the CARES Act. Accordingly, the Company recorded a total gain on the extinguishment of debt of $3.7 million during the year ended December 31, 2021
Principal Forgiveness [Member] | Paycheck Protection Program Loan | Maximum [Member]
Basis Of Presentation [Line Items]
Debt instrument, accrued interest	100,000
Principal Forgiveness [Member] | Aspen Aerogels Rhode Island, LLC [Member] | Paycheck Protection Program Loan
Basis Of Presentation [Line Items]
Debt instrument, principal amount	3,700,000
Gain on extinguishment of debt	3,700,000
Loan forgiveness description		On August 24, 2021, the SBA remitted $3.7 million in principal and less than $0.1 million in accrued interest to the PPP Investor after approving the Borrower’s application for forgiveness of the PPP Loan under the provisions of the CARES Act. Accordingly, the Company recorded a total gain on the extinguishment of debt of $3.7 million.
Principal Forgiveness [Member] | Aspen Aerogels Rhode Island, LLC [Member] | Paycheck Protection Program Loan | Maximum [Member]
Basis Of Presentation [Line Items]
Debt instrument, accrued interest	$ 100,000
At The Market Offering [Member]
Basis Of Presentation [Line Items]
Proceeds from offering, net		$ 19,420,000	$ 9,673,000
Revolving Credit Facility [Member]
Basis Of Presentation [Line Items]
Outstanding borrowings under revolving line of credit		0
Letters of credit outstanding		1,300,000
Amount available under revolving line of credit		$ 12,600,000
Existing maturity date		Apr. 28, 2022