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Condensed Consolidated Statements of Cash Flows (Unaudited) - USD ($)
$ in Thousands
 9 Months Ended
Sep. 30, 2021
Sep. 30, 2020
Cash flows from operating activities    
Net loss $ (46,186) $ (27,720)
Adjustments to reconcile net loss to net cash used in operating activities:    
Depreciation and amortization expense 1,173 911
Loss on disposal of property and equipment 190
Noncash lease expense 2,201
Stock-based compensation expense 8,231 3,616
Net amortization of premiums and accretion discounts on investments 10 (4)
Change in fair value of redeemable convertible preferred stock warrant liability 897
Amortization of deferred debt issuance costs 151 84
Impairment of in-process research and development 1,190
Remeasurement of contingent consideration liability (980)
Changes in operating assets and liabilities:    
Prepaid expenses and other current assets (462) (5,000)
Other non-current assets (81) (1,560)
Accounts payable 3,079 1,442
Contract liabilities — related party (3,892) (2,493)
Deferred rent (119)
Operating lease liabilities (1,104) 0
Accrued and other current liabilities (1,244) 1,738
Other non-current liabilities 116 1
Net cash used in operating activities (37,608) (28,207)
Cash flows from investing activities    
Cash and restricted cash acquired in connection with the Merger 64,114
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 44,985
Purchases of property and equipment (9,968) (630)
Net cash provided by investing activities 282 102,769
Cash flows from financing activities    
Proceeds from issuance of common stock, net of issuance costs 143,754
Proceeds from exercise of stock options 1,622 193
Deferred issuance costs (154) (157)
Net cash provided by (used in) financing activities 145,222 36
Net change in cash, cash equivalents and restricted cash 107,896 74,598
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 196,753 89,487
Reconciliation of cash, cash equivalents and restricted cash:    
Cash and cash equivalents 192,226 84,960
Restricted cash 4,527 4,527
Cash, cash equivalents and restricted cash, at the end of period 196,753 89,487
Supplemental cash flow information    
Cash received from tax refund 214 3
Supplemental disclosures of noncash investing and financing activities    
Purchases of property and equipment included in accounts payable 2,585 76
Conversion of redeemable convertible preferred stock into common stock 144,083
Conversion of redeemable convertible preferred stock warrants to common stock warrants 2,922
Fair value of net assets acquired in Merger 84,142
Issuance of redeemable convertible preferred stock warrants in connection with the Loan Agreement 144
Adjustment to goodwill $ 413