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FAIR VALUE OF FINANCIAL INSTRUMENTS - Summary of Liabilities Measurements on a Recurring Basis (Details) - USD ($)
$ in Thousands
Sep. 30, 2022
Mar. 17, 2022
Dec. 31, 2021
Assets      
Investments $ 158,513   $ 167,365
Commercial paper, available for sale      
Assets      
Investments 52,408   76,930
Corporate Bonds, available for sale      
Assets      
Investments 96,762   84,588
Municipal bonds, available for sale      
Assets      
Investments 9,343   5,847
Level 2 | Series A warrants      
Liabilities      
Warrant liability   $ 43,900  
Fair Value Measurements on Recurring Basis      
Assets      
Cash equivalents 51,371   27,389
Investments 158,513   167,365
Total assets 209,884   194,754
Liabilities      
Total warrant liability 66,265   6,113
Fair Value Measurements on Recurring Basis | RTI warrants      
Liabilities      
Warrant liability 4,622   5,175
Fair Value Measurements on Recurring Basis | Private warrants      
Liabilities      
Warrant liability 929   938
Fair Value Measurements on Recurring Basis | Series A warrants      
Liabilities      
Warrant liability 60,714   0
Fair Value Measurements on Recurring Basis | Commercial paper, available for sale      
Assets      
Investments 52,408   76,930
Fair Value Measurements on Recurring Basis | Corporate Bonds, available for sale      
Assets      
Investments 96,762   84,588
Fair Value Measurements on Recurring Basis | Municipal bonds, available for sale      
Assets      
Investments 9,343   5,847
Fair Value Measurements on Recurring Basis | Level 1      
Assets      
Cash equivalents 41,404   27,389
Investments 0   0
Total assets 41,404   27,389
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 9,967   0
Investments 158,513   167,365
Total assets 168,480   167,365
Liabilities      
Total warrant liability 60,714   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 60,714   0
Fair Value Measurements on Recurring Basis | Level 2 | Commercial paper, available for sale      
Assets      
Investments 52,408   76,930
Fair Value Measurements on Recurring Basis | Level 2 | Corporate Bonds, available for sale      
Assets      
Investments 96,762   84,588
Fair Value Measurements on Recurring Basis | Level 2 | Municipal bonds, available for sale      
Assets      
Investments 9,343   5,847
Fair Value Measurements on Recurring Basis | Level 3      
Assets      
Cash equivalents 0   0
Investments 0   0
Total assets 0   0
Liabilities      
Total warrant liability 5,551   6,113
Fair Value Measurements on Recurring Basis | Level 3 | RTI warrants      
Liabilities      
Warrant liability 4,622   5,175
Fair Value Measurements on Recurring Basis | Level 3 | Private warrants      
Liabilities      
Warrant liability 929   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