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Condensed Consolidated Statements of Cash Flows (Unaudited) - USD ($)
$ in Thousands
 6 Months Ended
Jun. 30, 2022
Jun. 30, 2021
OPERATING CASH FLOW    
Net loss $ (44,753) $ (47,345)
Adjustments to reconcile net loss to operating cash flow:    
Depreciation 1,215 1,014
Amortization of intangibles 89 89
Equity-based compensation expense 2,132 4,188
Change in fair value of warrant liabilities (6,120) 0
Net noncash change in right of use assets and lease liabilities 803 754
Changes in assets and liabilities:    
Prepaid expenses and other assets (2,597) 426
Accounts receivable (10,168) (7,728)
Accounts payable and accrued expenses 1,789 (555)
Lease liability (812) (896)
Deferred DOE cost share (104) 426
Deferred revenue (621) 65
Accrued compensation (4,905) (1,116)
Net cash used in operating activities (64,052) (50,678)
INVESTING CASH FLOW    
Purchases of property, plant and equipment (1,581) (437)
Net cash used in investing activities (1,581) (437)
FINANCING CASH FLOW    
Proceeds from Transaction, net 341,462 0
Payments of Transaction costs (2,401) 0
Proceeds from debt issuance 0 27,200
Repayment of debt 0 (47,200)
Proceeds from sale of convertible preferred units 0 100,500
Proceeds from exercise of common unit options 847 394
Repurchase of common units (566) 0
Issuance of treasury units 20 73
Net cash provided by financing activities 339,362 80,967
Net increase in cash and cash equivalents 273,729 29,852
Cash and Cash Equivalents [Abstract]    
Beginning of period 77,094 4,864
End of period 350,823 34,716
Summary of noncash investing and financing activities:    
Assumption of Transaction warrant liabilities 47,532 0
Debt converted to equity 14,181 0
Conversion of equity options to liability award 50 0
Conversion of accounts payable to convertible preferred units 0 39
Equity issuance fees 0 1,960
Supplemental disclosures of cash flow information:    
Cash paid for interest $ 0 $ 1,478