FAIR VALUE OF FINANCIAL INSTRUMENTS - Summary of Assets and Liabilities Measurements on a Recurring Basis (Details) - USD ($) $ in Thousands	Dec. 31, 2025	Dec. 31, 2024
Assets
Investments	$ 13,631	$ 0
Corporate Debt Securities
Assets
Investments	13,631
Fair Value Measurements on Recurring Basis
Assets
Cash equivalents	140,694	10,409
Restricted cash equivalents - current	1,984	16,656
Restricted cash equivalents - noncurrent	9,356	9,172
Liabilities
Total warrant liability	58,831	130,199
Fair Value Measurements on Recurring Basis \| Put Option Liability
Liabilities
Put Option liability	0	3,443
Fair Value Measurements on Recurring Basis \| RTI Warrants
Liabilities
Warrant liability	0	10,109
Fair Value Measurements on Recurring Basis \| Private Warrants - Liability Classified
Liabilities
Warrant liability	9	443
Fair Value Measurements on Recurring Basis \| Series A warrants
Liabilities
Warrant liability	13,673	61,329
Fair Value Measurements on Recurring Basis \| Series B Warrants
Liabilities
Warrant liability	15,749	20,468
Fair Value Measurements on Recurring Basis \| Series C Warrants
Liabilities
Warrant liability	29,400	37,850
Fair Value Measurements on Recurring Basis \| Corporate Debt Securities
Assets
Investments	13,631	0
Fair Value Measurements on Recurring Basis \| Level 1
Assets
Cash equivalents	140,694	10,409
Restricted cash equivalents - current	1,984	16,656
Restricted cash equivalents - noncurrent	9,356	9,172
Liabilities
Total warrant liability	0	0
Fair Value Measurements on Recurring Basis \| Level 1 \| Put Option Liability
Liabilities
Put Option liability	0	0
Fair Value Measurements on Recurring Basis \| Level 1 \| RTI Warrants
Liabilities
Warrant liability	0	0
Fair Value Measurements on Recurring Basis \| Level 1 \| Private Warrants - Liability Classified
Liabilities
Warrant liability	0	0
Fair Value Measurements on Recurring Basis \| Level 1 \| Series A warrants
Liabilities
Warrant liability	0	0
Fair Value Measurements on Recurring Basis \| Level 1 \| Series B Warrants
Liabilities
Warrant liability	0	0
Fair Value Measurements on Recurring Basis \| Level 1 \| Series C Warrants
Liabilities
Warrant liability	0	0
Fair Value Measurements on Recurring Basis \| Level 1 \| Corporate Debt Securities
Assets
Investments	0	0
Fair Value Measurements on Recurring Basis \| Level 2
Assets
Cash equivalents	0	0
Restricted cash equivalents - current	0	0
Restricted cash equivalents - noncurrent	0	0
Liabilities
Total warrant liability	13,673	61,329
Fair Value Measurements on Recurring Basis \| Level 2 \| Put Option Liability
Liabilities
Put Option liability	0	0
Fair Value Measurements on Recurring Basis \| Level 2 \| RTI Warrants
Liabilities
Warrant liability	0	0
Fair Value Measurements on Recurring Basis \| Level 2 \| Private Warrants - Liability Classified
Liabilities
Warrant liability	0	0
Fair Value Measurements on Recurring Basis \| Level 2 \| Series A warrants
Liabilities
Warrant liability	13,673	61,329
Fair Value Measurements on Recurring Basis \| Level 2 \| Series B Warrants
Liabilities
Warrant liability	0	0
Fair Value Measurements on Recurring Basis \| Level 2 \| Series C Warrants
Liabilities
Warrant liability	0	0
Fair Value Measurements on Recurring Basis \| Level 2 \| Corporate Debt Securities
Assets
Investments	13,631	0
Fair Value Measurements on Recurring Basis \| Level 3
Assets
Cash equivalents	0	0
Restricted cash equivalents - current	0	0
Restricted cash equivalents - noncurrent	0	0
Liabilities
Total warrant liability	45,158	68,870
Fair Value Measurements on Recurring Basis \| Level 3 \| Put Option Liability
Liabilities
Put Option liability	0	3,443
Fair Value Measurements on Recurring Basis \| Level 3 \| RTI Warrants
Liabilities
Warrant liability	0	10,109
Fair Value Measurements on Recurring Basis \| Level 3 \| Private Warrants - Liability Classified
Liabilities
Warrant liability	9	443
Fair Value Measurements on Recurring Basis \| Level 3 \| Series A warrants
Liabilities
Warrant liability	0	0
Fair Value Measurements on Recurring Basis \| Level 3 \| Series B Warrants
Liabilities
Warrant liability	15,749	20,468
Fair Value Measurements on Recurring Basis \| Level 3 \| Series C Warrants
Liabilities
Warrant liability	29,400	37,850
Fair Value Measurements on Recurring Basis \| Level 3 \| Corporate Debt Securities
Assets
Investments	$ 0	$ 0

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