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Condensed Consolidated Statements of Cash Flows - USD ($)
$ in Thousands
 3 Months Ended
Mar. 31, 2023
Mar. 31, 2022
Cash flows from operating activities:    
Net loss $ (30,070) $ (25,328)
Adjustments to reconcile net loss to net cash used in operating activities:    
Amortization of (discount) premium on available-for-sale securities (215) 371
Equity-based compensation expense 2,118 2,612
Depreciation and impairment expense 1,077 709
Changes in operating assets and liabilities:    
Prepaid expenses and other current and non-current assets 1,261 (3,366)
Accounts receivable - related party   96
Accounts payable 2,745 71
Accrued expenses and other current and non-current liabilities (4,911) (445)
Deferred revenue- related party, current and non-current   (1,910)
Net cash used in operating activities (27,995) (27,190)
Cash flows from investing activities:    
Purchases of property and equipment (506) (184)
Proceeds from sale and maturities of available-for-sale securities 37,766 46,808
Purchases of available-for-sale securities   (8,881)
Net cash provided in investing activities 37,260 37,743
Cash flows from financing activities:    
Proceeds from exercise of warrants   22
Net cash provided by financing activities   22
Net increase in cash, cash equivalents and restricted cash 9,265 10,575
Cash, cash equivalents, and restricted cash at beginning of period 157,217 121,206
Cash, cash equivalents, and restricted cash at end of period $ 166,482 131,781
Supplemental disclosure of non-cash investing and financing activities:    
Property and equipment included in accounts payable and accruals   $ 264