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Condensed Consolidated Statements of Cash Flows - USD ($)
$ in Thousands
 3 Months Ended
Mar. 31, 2024
Mar. 31, 2023
Cash flows from operating activities    
Net loss $ (18,730) $ (14,965)
Adjustments to reconcile net loss to net cash used in operating activities    
Stock-based compensation expense 3,114 2,860
Amortization of operating lease right-of-use assets 1,075 786
Depreciation 516 385
Amortization (accretion) of premium (discount) on securities, net (751) (669)
Changes in operating assets and liabilities:    
Prepaid expenses and other assets (309) (513)
Accounts payable 94 53
Accrued expenses and other liabilities (268) 65
Operating lease liabilities (1,007) (526)
Net cash used in operating activities (16,266) (12,524)
Cash flows from investing activities    
Proceeds from maturities of securities 23,000 14,249
Purchases of securities 0 (27,052)
Purchases of property and equipment (647) (692)
Net cash provided by (used in) investing activities 22,353 (13,495)
Cash flows from financing activities    
Proceeds from exercise of stock options 245 1
Net cash provided by financing activities 245 1
Net increase (decrease) in cash, cash equivalents and restricted cash 6,332 (26,018)
Cash, cash equivalents and restricted cash at beginning of period 20,399 115,477
Cash, cash equivalents and restricted cash at end of period 26,731 89,459
Supplementary cash flow information on non-cash activities:    
Acquisitions of property and equipment included in accounts payable 275 115
Right-of-use asset obtained in exchange for operating lease liability $ 0 $ 7,623