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Condensed Consolidated Statements of Cash Flows - USD ($)
$ in Thousands
 3 Months Ended
Mar. 31, 2021
Mar. 31, 2020
Operating activities    
Net loss $ (8,499) $ (8,177)
Adjustments to reconcile net loss to net cash used in operating activities:    
Depreciation and amortization   2
Amortization of operating lease asset 46 44
Warrant inducement expense   4,829
Stock-based compensation 1,774 437
Deferred tax liabilities (501)  
Changes in operating assets and liabilities:    
Prepaid expenses and other assets (159) 159
Accounts payable and accrued expenses 2,220 552
Operating lease liability (47) (43)
Net cash used in operating activities (5,166) (2,197)
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 (5,616) 2,994
Cash and cash equivalents at beginning of period 114,195 8,791
Cash and cash equivalents at end of period 108,579 $ 11,785
Supplemental disclosure of non-cash investing and financing activities    
Common stock exchanged for warrants $ 1