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Condensed Consolidated Statements of Cash Flows - USD ($)
$ in Thousands
 6 Months Ended
Jun. 30, 2022
Jun. 30, 2021
Operating activities    
Net loss $ (19,111) $ (15,883)
Adjustments to reconcile net loss to net cash used in operating activities:    
Amortization of operating lease asset 187 90
Stock-based compensation 4,494 3,808
Deferred tax liabilities   (1,089)
Changes in operating assets and liabilities:    
Prepaid expenses and other assets 1,282 (53)
Accounts payable and accrued expenses (1,042) 609
Operating lease liability (183) (94)
Net cash used in operating activities (14,373) (12,612)
Financing activities    
Offering costs in connection with PIPE transaction   (450)
Net cash used in financing activities   (450)
Net change in cash and cash equivalents (14,373) (13,062)
Cash and cash equivalents at beginning of period 84,833 114,195
Cash and cash equivalents at end of period 70,460 101,133
Supplemental disclosure of non-cash investing and financing activities    
Common stock exchanged for X1 preferred stock $ 1  
Common stock exchanged for warrants   1
Increase in operating lease asset and liability due to lease modification   $ 219