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Condensed Consolidated Statements of Cash Flows (unaudited) - USD ($)
$ in Thousands
 6 Months Ended
Jun. 30, 2022
Jun. 30, 2021
Operating activities:    
Net income (loss) $ (29,937) $ (18,356)
Adjustments to reconcile net loss to net cash used in operating activities:    
Stock-based compensation expense 3,522 1,320
Depreciation expense 283 101
Non-cash lease expense 961 336
Change in fair value of derivative liability 262 0
Changes in operating assets and liabilities:    
Prepaid expenses and other current assets (2,726) (2,691)
Other receivables (2,220) 0
Other non-current assets (1,206) 0
Accounts payable 132 1,864
Accrued expenses and other current liabilities 3,528 (1)
Deferred revenue 13,071 0
Right of use assets and operating lease liability (115) (328)
Other liabilities 191 (31)
Net cash used in operating activities (14,254) (17,786)
Investing activities:    
Purchases of property and equipment (1,139) (124)
Net cash used in investing activities (1,139) (124)
Financing activities:    
Proceeds from at the market offering of common stock 3,653 0
Proceeds from initial public offering of common stock 0 111,600
Payment of equity issuance costs (239) (2,087)
Proceeds from stock option exercises 160 152
Net cash provided by financing activities 3,574 109,665
Net (decrease) increase in cash and cash equivalents (11,819) 91,755
Cash, cash equivalents and restricted cash—beginning of period 158,830 92,777
Cash, cash equivalents and restricted cash—end of period 147,011 184,532
Non-cash investing and financing activities:    
Purchases of property and equipment in accounts payable and accrued expenses 1,881 15
Issuance costs in accounts payable and accrued expenses 75 318
Stock option exercise receivables in prepaid expenses and other current assets (30) 0
Non-cash accretion of Series A and Series B redeemable convertible preferred stock $ 0 $ 151,942