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FAIR VALUE OF FINANCIAL INSTRUMENTS - Summary of Assets and Liabilities Measurements on a Recurring Basis (Details) - USD ($) $ in Thousands | Sep. 30, 2023 | Dec. 31, 2022 | Mar. 17, 2022
--- | --- | --- | ---
Assets |  |  |
Investments | $ 12,026 | $ 98,592 |
Commercial paper, available for sale |  |  |
Assets |  |  |
Investments | 9,866 | 32,756 |
Corporate Bonds, available for sale |  |  |
Assets |  |  |
Investments | 0 | 58,442 |
US Treasury Notes, Available for sale |  |  |
Assets |  |  |
Investments | 2,160 |  |
Municipal bonds, available for sale |  |  |
Assets |  |  |
Investments | 0 | 7,394 |
Level 2 | Series A warrants |  |  |
Liabilities |  |  |
Warrant liability |  |  | $ 43,900
Fair Value Measurements on Recurring Basis |  |  |
Assets |  |  |
Cash equivalents | 189,610 | 51,250 |
Restricted cash equivalents - current | 33,277 | 68,850 |
Restricted cash equivalents - noncurrent | 151,513 | 94,781 |
Total investments | 12,026 | 98,592 |
Liabilities |  |  |
Total warrant liability | 38,214 | 55,883 |
Fair Value Measurements on Recurring Basis | RTI warrants |  |  |
Liabilities |  |  |
Warrant liability | 2,185 | 3,670 |
Fair Value Measurements on Recurring Basis | Private warrants |  |  |
Liabilities |  |  |
Warrant liability | 493 | 784 |
Fair Value Measurements on Recurring Basis | Series A warrants |  |  |
Liabilities |  |  |
Warrant liability | 35,536 | 51,429 |
Fair Value Measurements on Recurring Basis | Commercial paper, available for sale |  |  |
Assets |  |  |
Investments | 9,866 | 32,756 |
Fair Value Measurements on Recurring Basis | Corporate Bonds, available for sale |  |  |
Assets |  |  |
Investments | 0 | 58,442 |
Fair Value Measurements on Recurring Basis | US Treasury Notes, Available for sale |  |  |
Assets |  |  |
Investments | 2,160 | 0 |
Fair Value Measurements on Recurring Basis | Municipal bonds, available for sale |  |  |
Assets |  |  |
Investments | 0 | 7,394 |
Fair Value Measurements on Recurring Basis | Level 1 |  |  |
Assets |  |  |
Cash equivalents | 60,349 | 51,250 |
Restricted cash equivalents - current | 33,277 | 68,850 |
Restricted cash equivalents - noncurrent | 151,513 | 94,781 |
Total investments | 2,160 | 0 |
Liabilities |  |  |
Total warrant 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 |  |  |
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 | Commercial paper, available for sale |  |  |
Assets |  |  |
Investments | 0 | 0 |
Fair Value Measurements on Recurring Basis | Level 1 | Corporate Bonds, available for sale |  |  |
Assets |  |  |
Investments | 0 | 0 |
Fair Value Measurements on Recurring Basis | Level 1 | US Treasury Notes, Available for sale |  |  |
Assets |  |  |
Investments | 2,160 | 0 |
Fair Value Measurements on Recurring Basis | Level 1 | Municipal bonds, available for sale |  |  |
Assets |  |  |
Investments | 0 | 0 |
Fair Value Measurements on Recurring Basis | Level 2 |  |  |
Assets |  |  |
Cash equivalents | 129,261 | 0 |
Restricted cash equivalents - current | 0 | 0 |
Restricted cash equivalents - noncurrent | 0 | 0 |
Total investments | 9,866 | 98,592 |
Liabilities |  |  |
Total warrant liability | 35,536 | 51,429 |
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 |  |  |
Liabilities |  |  |
Warrant liability | 0 | 0 |
Fair Value Measurements on Recurring Basis | Level 2 | Series A warrants |  |  |
Liabilities |  |  |
Warrant liability | 35,536 | 51,429 |
Fair Value Measurements on Recurring Basis | Level 2 | Commercial paper, available for sale |  |  |
Assets |  |  |
Investments | 9,866 | 32,756 |
Fair Value Measurements on Recurring Basis | Level 2 | Corporate Bonds, available for sale |  |  |
Assets |  |  |
Investments | 0 | 58,442 |
Fair Value Measurements on Recurring Basis | Level 2 | US Treasury Notes, Available for sale |  |  |
Assets |  |  |
Investments | 0 | 0 |
Fair Value Measurements on Recurring Basis | Level 2 | Municipal bonds, available for sale |  |  |
Assets |  |  |
Investments | 0 | 7,394 |
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 |
Total investments | 0 | 0 |
Liabilities |  |  |
Total warrant liability | 2,678 | 4,454 |
Fair Value Measurements on Recurring Basis | Level 3 | RTI warrants |  |  |
Liabilities |  |  |
Warrant liability | 2,185 | 3,670 |
Fair Value Measurements on Recurring Basis | Level 3 | Private warrants |  |  |
Liabilities |  |  |
Warrant liability | 493 | 784 |
Fair Value Measurements on Recurring Basis | Level 3 | Series A warrants |  |  |
Liabilities |  |  |
Warrant liability | 0 | 0 |
Fair Value Measurements on Recurring Basis | Level 3 | Commercial paper, available for sale |  |  |
Assets |  |  |
Investments | 0 | 0 |
Fair Value Measurements on Recurring Basis | Level 3 | Corporate Bonds, available for sale |  |  |
Assets |  |  |
Investments | 0 | 0 |
Fair Value Measurements on Recurring Basis | Level 3 | US Treasury Notes, Available for sale |  |  |
Assets |  |  |
Investments | 0 | 0 |
Fair Value Measurements on Recurring Basis | Level 3 | Municipal bonds, available for sale |  |  |
Assets |  |  |
Investments | $ 0 | $ 0 |

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