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Statements of Cash Flows - USD ($)
$ in Thousands
 3 Months Ended 12 Months Ended
Mar. 31, 2022
Mar. 31, 2021
Dec. 31, 2021
Dec. 31, 2020
Cash Flows from Operating Activities:        
Net loss     $ (102,493) $ (88,387)
Adjustments to reconcile net loss to operating cash flow:        
Depreciation $ 577 $ 475 2,018 1,900
Amortization of intangible assets 44 44 177 178
Equity-based compensation expense 1,021 3,122 6,441 3,718
Accrued interest on convertible note payable     127 701
Net noncash change in right of use assets and lease liabilities 406 378 1,501 1,486
Changes in assets and liabilities:        
Prepaid expenses and other assets (1,371) 91 (1,540) (462)
Accounts receivable (2,716) (7,071) (2,043) 18,042
Accounts payable and accrued expenses (646) (5,525) 5,886 6,493
Lease liability (452) (411) (1,650) (1,594)
Deferred DOE cost share (105) 161 (13,254) 13,358
Deferred revenue (773) (32) 1,148 224
Accrued compensation (5,763) 1,647 4,520 (2,892)
Net cash used in operating activities (33,151) (29,787) (99,162) (47,235)
Cash Flows from Investing Activities        
Purchases of property, plant and equipment (1,187) (111) (1,952) (3,526)
Net cash used in investing activities (1,187) (111) (1,952) (3,526)
Cash Flows from Financing Activities:        
Proceeds from debt issuance   22,700   23,000
Repayment of debt     (20,000) (3,000)
Proceeds from short-term borrowings     27,200  
Repayment of short-term borrowings     (27,200)  
Proceeds from sale of convertible preferred units   40,500 192,500 18,500
Proceeds from exercise of common unit options 470 11 748 43
Repurchase of common units (563)   (17) (49)
Issuance of treasury units 20   113  
Net cash used in financing activities (73) 63,211 173,344 38,494
Net change in cash (34,411) 33,313 72,230 (12,267)
Cash and cash equivalents:        
Cash - beginning of the period 77,094 4,864 4,864 17,131
Cash - ending of the period $ 42,683 38,177 77,094 4,864
Summary of noncash investing and financing activities:        
Conversion of accounts payable to convertible preferred units   $ 39 65 378
Capital expenditures in accounts payable       290
Equity issuance fees     1,960  
Increase in lease liability       $ 846
Supplemental disclosures of cash flow information:        
Cash paid for interest     $ 1,478