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CONDENSED STATEMENTS OF CASH FLOWS - USD ($)
$ in Thousands
 3 Months Ended
Mar. 31, 2024
Mar. 31, 2023
Cash flows from operating activities:    
Net loss $ (18,504) $ (20,724)
Adjustments to reconcile net loss to net cash used in operations:    
Stock-based compensation 2,475 1,683
Depreciation 974 1,014
Non-cash operating lease expense 101 85
Net amortization (accretion) of investments (371) (213)
Changes in operating assets and liabilities:    
Prepaid expenses and other current assets 1,530 1,462
Other assets 10 30
Accounts payable 906 (2,197)
Accrued expenses and other current liabilities (1,954) (7,356)
Non-current operating lease liabilities (213) (188)
Deferred revenue (1,115) (57)
Net cash used in operating activities (16,161) (26,461)
Cash flows from investing activities:    
Purchases of property and equipment 0 (75)
Sale and maturities of investments 5,000 45,200
Purchases of investments (38,276) 0
Net cash (used in) provided by investing activities (33,276) 45,125
Cash flows from financing activities:    
Proceeds from the exercises of stock options and purchases pursuant to employee stock purchase plan 609 39
Taxes paid related to net share settlement of equity awards (437) (39)
Offering cost (356) 0
Net cash (used in) provided by financing activities (184) 0
Net (decrease) increase in cash and cash equivalents (49,621) 18,664
Cash and cash equivalents, beginning of period 125,626 47,379
Cash and cash equivalents, end of period 76,005 66,043
Supplemental disclosures of non-cash financial activities:    
Deferred revenue billed but not received 5,378 500
Unpaid amounts related to purchases of property and equipment $ 0 $ 155