SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES AND RECENT ACCOUNTING PRONOUNCEMENTS - Schedule of Balance Receivable Related to Services Revenue and Government Grants (Details) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2026	Jun. 30, 2025	Jun. 30, 2026	Jun. 30, 2025	Dec. 31, 2025
Summary Of Significant Accounting Policy [Line Items]
Accounts receivable	$ 40,782		$ 40,782		$ 32,940
Unbilled Receivables and Contract Assets	75,359		75,359		41,529
DOE
Summary Of Significant Accounting Policy [Line Items]
Accounts receivable	40,333		40,333		23,628
Unbilled Receivables and Contract Assets	69,998		69,998		39,644
Department of War
Summary Of Significant Accounting Policy [Line Items]
Unbilled Receivables and Contract Assets	$ 2,190		$ 2,190		$ 1,091
United States Government
Summary Of Significant Accounting Policy [Line Items]
Percentage of total revenue and grant income	90.30%	80.40%	90.90%	81.40%
DOW Chemical Company
Summary Of Significant Accounting Policy [Line Items]
Percentage of total revenue and grant income	4.40%	13.30%	4.40%	11.90%