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Condensed Consolidated Statements of Cash Flows - USD ($)
$ in Thousands
 6 Months Ended
Jun. 30, 2021
Jun. 30, 2020
Operating activities    
Net loss $ (15,883) $ (10,763)
Adjustments to reconcile net loss to net cash used in operating activities:    
Depreciation and amortization   4
Amortization of operating lease asset 90 88
Warrant inducement expense   4,829
Stock-based compensation 3,808 634
Deferred tax liabilities (1,089)  
Changes in operating assets and liabilities:    
Prepaid expenses and other assets (53) 311
Accounts payable and accrued expenses 609 (233)
Operating lease liability (94) (88)
Net cash used in operating activities (12,612) (5,218)
Financing activities    
Proceeds from exercise of warrants, net   5,191
Offering costs in connection with PIPE transaction (450)  
Net cash (used in) provided by financing activities (450) 5,191
Net change in cash and cash equivalents (13,062) (27)
Cash and cash equivalents at beginning of period 114,195 8,791
Cash and cash equivalents at end of period 101,133 $ 8,764
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