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Condensed Consolidated Statements of Cash Flows (Unaudited) - USD ($)
$ in Thousands
 6 Months Ended
Jun. 30, 2021
Jun. 30, 2020
Cash flows from operating activities    
Net loss $ (32,173) $ (12,941)
Adjustments to reconcile net loss to net cash used in operating activities:    
Depreciation and amortization expense 785 626
Noncash lease expense 1,377  
Stock-based compensation expense 5,702 650
Net amortization of premiums and accretion discounts on investments 10 (29)
Change in fair value of redeemable convertible preferred stock warrant liability   (57)
Amortization of deferred debt issuance costs 100  
Impairment of in-process research and development 1,190  
Remeasurement of contingent consideration liability (980)  
Changes in operating assets and liabilities:    
Accounts receivable - related party   (10,000)
Prepaid expenses and other current assets (1,240) (2,897)
Other non-current assets (116) (748)
Accounts payable 764 1,114
Contract liabilities — related party (833) 535
Deferred rent   (87)
Operating lease liabilities (1,098)  
Accrued and other current liabilities (1,412) 3,476
Net cash used in operating activities (27,924) (20,358)
Cash flows from investing activities    
Proceeds from sales of marketable debt securities 7,500  
Purchases of marketable debt securities   (5,700)
Proceeds from maturities of marketable debt securities 2,750 34,235
Purchases of property and equipment (2,790) (412)
Net cash provided by investing activities 7,460 28,123
Cash flows from financing activities    
Proceeds from issuance of common stock, net of issuance costs 143,754  
Proceeds from exercise of stock options 1,255 49
Deferred issuance costs (149) (157)
Net cash provided by (used in) financing activities 144,860 (108)
Net change in cash, cash equivalents and restricted cash 124,396 7,657
Cash, cash equivalents and restricted cash, at the beginning of period 88,857 14,889
Cash, cash equivalents and restricted cash, at the end of period 213,253 22,546
Reconciliation of cash, cash equivalents and restricted cash:    
Cash and cash equivalents 208,726 18,264
Restricted cash 4,527 4,282
Cash, cash equivalents and restricted cash, at the end of period 213,253 22,546
Supplemental cash flow information    
Cash received from tax refund 158  
Supplemental disclosures of noncash investing and financing activities    
Purchases of property and equipment included in accounts payable 1,363 43
Issuance of redeemable convertible preferred stock warrants in connection with the Loan Agreement   $ 144
Adjustment to goodwill $ 413