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Condensed Statements of Cash Flows - USD ($)
$ in Thousands
 3 Months Ended
Mar. 31, 2022
Mar. 31, 2021
Cash flows from operating activities    
Net loss $ (9,129) $ (26,997)
Adjustments to reconcile net loss to net cash used in operating activities:    
Depreciation 4  
Change in fair value of preferred stock tranche rights liability and preferred stock warrant liability   23,217
Stock-based compensation expense 618 126
Amortization of premiums and accretion of discounts on marketable securities, net 216  
Amortization of right-of-use asset 33  
Changes in operating assets and liabilities:    
Prepaid expenses and other current assets 1,416 (44)
Other assets (65) (13)
Accounts payable 121 387
Operating lease liability (32)  
Accrued expenses and other current liabilities (1,481) 954
Net cash used in operating activities (8,299) (2,370)
Cash flows from investing activities    
Purchases of marketable securities (9,090)  
Proceeds from maturities and sales of marketable securities 4,000  
Purchases of property and equipment (9)  
Net cash used in investing activities (5,099)  
Net change in cash and cash equivalents (13,398) (2,370)
Cash and cash equivalents at the beginning of the period 122,162 43,777
Cash and cash equivalents at the end of the period 108,764 41,407
Supplemental disclosure of noncash investing and financing activities    
Purchases of property and equipment in accounts payable $ 10  
Deferred offering costs in accrued expenses and other current liabilities   $ 257