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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