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Document and Entity Information - USD ($)
$ in Millions
 12 Months Ended
Dec. 31, 2021
Feb. 25, 2022
Jun. 30, 2021
Cover [Abstract]      
Document Type 10-K    
Amendment Flag false    
Document Period End Date Dec. 31, 2021    
Document Fiscal Year Focus 2021    
Document Fiscal Period Focus FY    
Trading Symbol ASPN    
Entity Registrant Name ASPEN AEROGELS, INC.    
Entity Central Index Key 0001145986    
Current Fiscal Year End Date --12-31    
Entity Well-known Seasoned Issuer Yes    
Entity Current Reporting Status Yes    
Entity Voluntary Filers No    
Entity Filer Category Large Accelerated Filer    
Entity File Number 001-36481    
Entity Tax Identification Number 04-3559972    
Entity Address, Address Line One 30 Forbes Road    
Entity Address, Address Line Two Building B    
Entity Address, City or Town Northborough    
Entity Address, State or Province MA    
Entity Address, Postal Zip Code 01532    
City Area Code 508    
Local Phone Number 691-1111    
Entity Emerging Growth Company false    
Entity Small Business false    
Entity Shell Company false    
ICFR Auditor Attestation Flag true    
Entity Interactive Data Current Yes    
Title of 12(b) Security Common Stock, par value $0.00001 per share    
Security Exchange Name NYSE    
Entity Incorporation, State or Country Code DE    
Document Annual Report true    
Document Transition Report false    
Entity Common Stock, Shares Outstanding   33,234,316  
Entity Public Float     $ 936.7
Auditor Name KPMG LLP    
Auditor Firm ID 185    
Auditor Location Hartford, CT, United States of America    
Documents Incorporated by Reference

 

DOCUMENTS INCORPORATED BY REFERENCE

Portions of the registrant’s definitive Proxy Statement for its Annual Meeting of Stockholders to be held on June 2, 2022 are incorporated by reference into Part III of this Annual Report on Form 10-K to the extent stated herein.