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Condensed Consolidated Statements of Cash Flows - USD ($)
$ in Thousands
 9 Months Ended
Sep. 30, 2021
Sep. 30, 2020
Operating activities    
Net loss and other comprehensive loss $ (25,700) $ (16,907)
Adjustments to reconcile net loss to net cash used in operating activities:    
Depreciation and amortization   5
Amortization of operating lease asset 134 133
Warrant inducement expense   4,829
Stock-based compensation 5,851 1,512
Deferred tax liabilities (1,775)  
Changes in operating assets and liabilities:    
Prepaid expenses and other assets (55) 771
Accounts payable and accrued expenses 1,980 4,011
Operating lease liability (140) (133)
Net cash used in operating activities (19,705) (5,779)
Investing activities    
Cash and cash equivalents received from acquisition   11,035
Net cash provided by investing activities   11,035
Financing activities    
Proceeds from issuances of non-voting preferred stock, net   95,226
Proceeds from exercise of warrants, net   5,191
Proceeds from exercise of stock options 1  
Offering costs in connection with PIPE transaction (450)  
Net cash (used in) provided by financing activities (449) 100,417
Net change in cash and cash equivalents (20,154) 105,673
Cash and cash equivalents at beginning of period 114,195 8,791
Cash and cash equivalents at end of period 94,041 114,464
Supplemental disclosure of non-cash investing and financing activities    
Common stock exchanged for warrants 1  
Increase in operating lease asset and liability due to lease modification $ 219  
Issuance of common stock in acquisition   1,194
Issuance of non-voting convertible preferred stock in acquisition   69,723
Fair value of options assumed in acquisition   3,278
Fair value of warrants assumed in acquisition   $ 12,944