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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, 2022 | Mar. 17, 2022 | Dec. 31, 2021
--- | --- | --- | ---
Assets |  |  |
Investments | $ 98,592 |  | $ 167,365
Commercial paper, available for sale |  |  |
Assets |  |  |
Investments | 32,756 |  | 76,930
Corporate Bonds, available for sale |  |  |
Assets |  |  |
Investments | 58,442 |  | 84,588
Municipal bonds, available for sale |  |  |
Assets |  |  |
Investments | 7,394 |  | 5,847
Level 2 | Series A Warrants |  |  |
Liabilities |  |  |
Warrant liability |  | $ 43,900 |
Fair Value Measurements on Recurring Basis |  |  |
Assets |  |  |
Cash equivalents | 51,250 |  | 27,389
Restricted cash equivalents - current | 68,850 |  | 141,855
Restricted cash equivalents - noncurrent | 94,781 |  | 88,586
Total investments | 98,592 |  | 167,365
Liabilities |  |  |
Total warrant liability | 55,883 |  | 6,113
Fair Value Measurements on Recurring Basis | RTI warrants |  |  |
Liabilities |  |  |
Warrant liability | 3,670 |  | 5,175
Fair Value Measurements on Recurring Basis | Private warrants |  |  |
Liabilities |  |  |
Warrant liability | 784 |  | 938
Fair Value Measurements on Recurring Basis | Series A Warrants |  |  |
Liabilities |  |  |
Warrant liability | 51,429 |  | 0
Fair Value Measurements on Recurring Basis | Commercial paper, available for sale |  |  |
Assets |  |  |
Investments | 32,756 |  | 76,930
Fair Value Measurements on Recurring Basis | Corporate Bonds, available for sale |  |  |
Assets |  |  |
Investments | 58,442 |  | 84,588
Fair Value Measurements on Recurring Basis | Municipal bonds, available for sale |  |  |
Assets |  |  |
Investments | 7,394 |  | 5,847
Fair Value Measurements on Recurring Basis | Level 1 |  |  |
Assets |  |  |
Cash equivalents | 51,250 |  | 27,389
Restricted cash equivalents - current | 68,850 |  | 141,855
Restricted cash equivalents - noncurrent | 94,781 |  | 88,586
Total investments | 0 |  | 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 | Municipal bonds, available for sale |  |  |
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
Total investments | 98,592 |  | 167,365
Liabilities |  |  |
Total warrant liability | 51,429 |  | 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 |  |  |
Liabilities |  |  |
Warrant liability | 0 |  | 0
Fair Value Measurements on Recurring Basis | Level 2 | Series A Warrants |  |  |
Liabilities |  |  |
Warrant liability | 51,429 |  | 0
Fair Value Measurements on Recurring Basis | Level 2 | Commercial paper, available for sale |  |  |
Assets |  |  |
Investments | 32,756 |  | 76,930
Fair Value Measurements on Recurring Basis | Level 2 | Corporate Bonds, available for sale |  |  |
Assets |  |  |
Investments | 58,442 |  | 84,588
Fair Value Measurements on Recurring Basis | Level 2 | Municipal bonds, available for sale |  |  |
Assets |  |  |
Investments | 7,394 |  | 5,847
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 | 4,454 |  | 6,113
Fair Value Measurements on Recurring Basis | Level 3 | RTI warrants |  |  |
Liabilities |  |  |
Warrant liability | 3,670 |  | 5,175
Fair Value Measurements on Recurring Basis | Level 3 | Private warrants |  |  |
Liabilities |  |  |
Warrant liability | 784 |  | 938
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 | Municipal bonds, available for sale |  |  |
Assets |  |  |
Investments | $ 0 |  | $ 0

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