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Condensed Consolidated Statements of Cash Flows - USD ($)
$ in Thousands
 9 Months Ended
Sep. 30, 2023
Sep. 30, 2022
Cash flows from operating activities:    
Net loss $ (31,478) $ (37,482)
Adjustments to reconcile net loss to net cash used in operating activities:    
Stock-based compensation 11,604 5,096
Right-of-use asset impairment 180 0
Non-cash operating lease expense 318 329
Accretion of discounts and amortization of premiums on investments, net (1,985) 223
Foreign currency loss (gain) from remeasurement (634) 2,220
Changes in operating assets and liabilities:    
Prepaid expenses and other assets 5,826 1,219
Long-term assets 114 (72)
Accounts payable (14) 91
Accrued liabilities (3,283) (188)
Operating lease liabilities (334) (356)
Long-term liabilities 34 0
Net cash used in operating activities (19,652) (28,920)
Cash flow from investing activities:    
Purchase of marketable securities (58,448) (81,249)
Proceeds from maturities of marketable securities 90,681 101,411
Net cash provided by investing activities 32,233 20,162
Cash flows from financing activities    
Proceeds from the exercise of stock options 553 0
Net cash provided by financing activities 553 0
Effect of exchange rate changes on cash and cash equivalents 634 (2,220)
Net change in cash and cash equivalents 13,768 (10,978)
Cash and cash equivalents at beginning of period 43,585 46,922
Cash and cash equivalents at end of period 57,353 35,944
Supplemental disclosure of cash operating activities:    
Cash paid for leases included in operating cash outflows 376 345
Supplemental disclosure of non-cash investing and financing activities:    
Right-of-use assets obtained in exchange for lease liabilities $ 313 $ 915