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Condensed Consolidated Statements of Cash Flows (Unaudited) - USD ($)
$ in Thousands
 3 Months Ended
Mar. 31, 2022
Mar. 31, 2021
Cash flows from operating activities:    
Net loss $ (12,835) $ (5,927)
Adjustments to reconcile net loss to net cash used in operating activities:    
Depreciation expense 256 185
Change in fair value of warrant liability 44 (4)
Stock-based compensation expense 1,594 185
Other (9) (4)
Changes in operating assets and liabilities:    
Prepaid expenses and other assets (1,660) 15
Accounts payable (756) 700
Accrued expenses and other liabilities (1,834) (287)
Net cash used in operating activities (15,200) (5,137)
Cash flows from investing activities:    
Purchases of property and equipment (599) (71)
Purchase of marketable securities (24,899)  
Net cash used in investing activities (25,498) (71)
Cash flows from financing activities:    
Proceeds from exercise of stock options 17 265
Other   (9)
Net cash provided by financing activities 17 87,489
Net (decrease) increase in cash, cash equivalents and restricted cash (40,681) 82,281
Cash, cash equivalents and restricted cash at beginning of period 149,211 17,487
Cash, cash equivalents and restricted cash at end of period 108,530 99,768
Supplemental disclosure of cash flow information:    
Purchases of property and equipment in accounts payable and accrued expenses and other liabilities $ 311  
Remeasurement of right-of-use assets and lease liabilities for lease modification   390
Series D Convertible Preferred Stock    
Cash flows from financing activities:    
Proceeds from issuance of convertible preferred stock, net of issuance costs   6,982
Series E Convertible Preferred Stock    
Cash flows from financing activities:    
Proceeds from issuance of convertible preferred stock, net of issuance costs   $ 80,251