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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