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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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