Revenue from Contracts with Customers - Summary of Revenue Disaggregated by Geographical Region and Source of Revenue (Detail) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2025	Dec. 31, 2024	Dec. 31, 2023
Disaggregation Of Revenue [Line Items]
Total revenue	$ 271,103	$ 452,699	$ 238,718
Energy Industrial [Member]
Disaggregation Of Revenue [Line Items]
Total revenue	102,198	145,867	128,639
Thermal Barrier [Member]
Disaggregation Of Revenue [Line Items]
Total revenue	168,905	306,832	110,079
Asia [Member]
Disaggregation Of Revenue [Line Items]
Total revenue	31,129	29,321	35,698
Canada [Member]
Disaggregation Of Revenue [Line Items]
Total revenue	2,466	19,265	2,033
Europe [Member]
Disaggregation Of Revenue [Line Items]
Total revenue	17,870	45,027	42,731
Latin America [Member]
Disaggregation Of Revenue [Line Items]
Total revenue	47,556	100,568	7,219
U.S. [Member]
Disaggregation Of Revenue [Line Items]
Total revenue	172,082	258,518	151,037
U.S. [Member] \| Energy Industrial [Member]
Disaggregation Of Revenue [Line Items]
Total revenue	54,637	63,761	52,838
U.S. [Member] \| Thermal Barrier [Member]
Disaggregation Of Revenue [Line Items]
Total revenue	117,445	194,757	98,199
International [Member]
Disaggregation Of Revenue [Line Items]
Total revenue	99,021	194,181	87,681
International [Member] \| Energy Industrial [Member]
Disaggregation Of Revenue [Line Items]
Total revenue	47,561	82,106	75,801
International [Member] \| Thermal Barrier [Member]
Disaggregation Of Revenue [Line Items]
Total revenue	$ 51,460	$ 112,075	$ 11,880

ASPEN AEROGELS INC 10-K/A