v3.26.1
Document and Entity Information - shares
6 Months Ended
Jun. 30, 2026
Aug. 04, 2026
Cover [Abstract]    
Document Type 10-Q  
Amendment Flag false  
Document Period End Date Jun. 30, 2026  
Document Fiscal Year Focus 2026  
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 false  
Entity Emerging Growth Company false  
Entity Common Stock, Shares Outstanding   82,988,784
Entity Current Reporting Status Yes  
Entity Shell Company false  
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, State or Province MA  
Entity Address, City or Town Northborough  
Entity Address, Postal Zip Code 01532  
City Area Code 508  
Local Phone Number 691-1111  
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 Quarterly Report true  
Document Transition Report false