SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES - Narrative (Details)		12 Months Ended
	Jun. 02, 2025 $ / shares	Dec. 31, 2025 USD ($) installment reporting_unit $ / shares	Dec. 31, 2024 USD ($) $ / shares	Dec. 31, 2023 USD ($) $ / shares	Oct. 24, 2025 USD ($)	Dec. 01, 2021 USD ($)
Concentration Risk [Line Items]
Forward split of common stock (in percentage)	1.5
Common stock, par or stated value per share (in USD per share) | $ / shares	$ 0.0001
Reduction in fair value of earnout		$ 0	$ (5,659,000)	$ (3,874,000)
Embedded derivatives		0	2,723,000
Prepaid expense, current		26,000,000.0	10,800,000
Prepaid expense for services, current		16,100,000	8,500,000
Impairment of intangible assets		$ 0	0	0
Number of reporting units | reporting_unit		7
Impairment losses		$ 0	3,594,000	0
Net sales		$ (166,419,000)	$ (144,180,000)	$ (136,062,000)
Diluted (in dollars per share) | $ / shares		$ (2.89)	$ (7.01)	$ (3.65)
Stock-based awards vest (in percentage)		25.00%
Monthly installments | installment		36
Grant date		three years
Gross research and development costs		$ 19,000,000.0	$ 13,000,000.0	$ 18,500,000
Government assistance, design and manufacture of Starlab						$ 217,500,000
Government assistance, operating expense, decrease		$ 6,200,000	$ 5,400,000	$ 37,000,000.0
Government Assistance, Operating Expense, Decrease (Increase), Statement of Income or Comprehensive Income [Extensible Enumeration]		Research and development	Research and development	Research and development
Government assistance, asset, decrease, current		$ 54,000,000.0	$ 54,900,000	$ 26,900,000
Marketing costs		$ 3,200,000	$ 1,000,000.0	$ 700,000
Government Assistance, Asset, Decrease, Current, Statement of Financial Position [Extensible Enumeration]		Property and equipment, net	Property and equipment, net	Property and equipment, net
First anniversary
Concentration Risk [Line Items]
Stock-based awards vest (in percentage)		33.00%
Second anniversary
Concentration Risk [Line Items]
Stock-based awards vest (in percentage)		33.00%
Third anniversary
Concentration Risk [Line Items]
Stock-based awards vest (in percentage)		33.00%
PF Adj
Concentration Risk [Line Items]
Net EAC adjustments		$ 11,100,000	$ 2,200,000	$ 1,700,000
Net sales		$ 5,100,000
Aggregate adjustment of revenue			$ 5,200,000	$ 3,900,000
Diluted (in dollars per share) | $ / shares		$ (0.40)	$ (0.58)	$ (0.47)
2024 Convertible Notes
Concentration Risk [Line Items]
Embedded derivatives		$ 3,100,000
Fair Value, Inputs, Level 3 | Selling, General and Administrative Expenses
Concentration Risk [Line Items]
Reduction in fair value of earnout			$ 5,700,000	$ 3,300,000
Measurement Input, Conversion Price | Fair Value, Inputs, Level 3
Concentration Risk [Line Items]
Mandatory conversion discount rate (in percentage)		0.150
Measurement Input, Discount Rate | Fair Value, Inputs, Level 3
Concentration Risk [Line Items]
Mandatory conversion discount rate (in percentage)		0.158
Measurement Input, Qualified Financing | Fair Value, Inputs, Level 3
Concentration Risk [Line Items]
Mandatory conversion discount rate (in percentage)		0.750
ExoTerra
Concentration Risk [Line Items]
Contingent consideration					$ 7,400,000
ExoTerra | Fair Value, Inputs, Level 3
Concentration Risk [Line Items]
Contingent consideration		$ 21,000,000.0
Optical Physics Company, Inc. | Fair Value, Inputs, Level 3
Concentration Risk [Line Items]
Contingent consideration		3,000,000.0
ZIN Technologies, Inc | Fair Value, Inputs, Level 3
Concentration Risk [Line Items]
Contingent consideration		10,300,000
U.S. Government
Concentration Risk [Line Items]
Net sales		$ (143,203,000)	$ (121,025,000)	$ (93,473,000)
U.S. Government | Revenue Benchmark | Customer Concentration Risk
Concentration Risk [Line Items]
Concentration risk (in percentage)		86.00%	83.90%	69.00%
U.S. Government | Accounts Receivable | Customer Concentration Risk
Concentration Risk [Line Items]
Concentration risk (in percentage)		68.60%	76.30%	83.00%