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Condensed Consolidated Statements of Cash Flows - USD ($)
$ in Thousands
 3 Months Ended
Mar. 31, 2023
Mar. 31, 2022
Operating activities    
Net loss $ (10,772) $ (9,864)
Adjustments to reconcile net loss to net cash used in operating activities:    
Amortization of operating lease asset 92 93
Stock-based compensation 1,381 2,186
Changes in operating assets and liabilities:    
Prepaid expenses and other assets 471 921
Accounts payable, accrued expenses and other liabilities (1,018) (1,401)
Operating lease liabilities (78) (91)
Net cash used in operating activities (9,924) (8,156)
Financing activities    
Net change in cash and cash equivalents (9,924) (8,156)
Cash and cash equivalents at beginning of period 56,409 84,833
Cash and cash equivalents at end of period $ 46,485 76,677
Supplemental disclosure of non-cash investing and financing activities    
Common stock exchanged for X1 non-voting convertible preferred stock   $ 1