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Condensed Consolidated Statements of Cash Flows - USD ($)
$ in Thousands
 9 Months Ended
Sep. 30, 2022
Sep. 30, 2021
Operating activities    
Net loss $ (29,582) $ (25,700)
Adjustments to reconcile net loss to net cash used in operating activities:    
Amortization of operating lease asset 280 134
Stock-based compensation 6,679 5,851
Deferred tax liabilities   (1,775)
Changes in operating assets and liabilities:    
Prepaid expenses and other assets 2,082 (55)
Accounts payable and accrued expenses 1,871 1,980
Operating lease liability (274) (140)
Net cash used in operating activities (18,944) (19,705)
Financing activities    
Proceeds from exercise of stock options   1
Offering costs in connection with PIPE transaction   (450)
Net cash used in financing activities   (449)
Net change in cash and cash equivalents (18,944) (20,154)
Cash and cash equivalents at beginning of period 84,833 114,195
Cash and cash equivalents at end of period 65,889 94,041
Supplemental disclosure of non-cash investing and financing activities    
Common stock exchanged for X1 non-voting convertible preferred stock 1  
Common stock exchanged for warrants   1
Increase in operating lease asset and liability due to lease modification $ 344 $ 219