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CONDENSED CONSOLIDATED STATEMENTS OF CASH FLOWS (UNAUDITED) - USD ($)
$ in Thousands
6 Months Ended
Jun. 30, 2026
Jun. 30, 2025
Cash flows from operating activities:    
Net loss $ (35,575) $ (53,289)
Adjustments to reconcile net loss to cash used in operating activities:    
Depreciation 572 722
Stock-based compensation expense 6,168 5,795
Amortization and interest accretion related to operating lease 1,874 1,874
Amortization of premiums and accretion of discounts on marketable securities, net (1,714) (1,150)
Impairment of long-lived assets 0 701
Changes in operating assets and liabilities:    
Prepaids and other current and non-current assets (217) 737
Accounts payable 229 (885)
Accrued expenses and other non-current liabilities (3,991) 496
Operating lease liabilities, current and non-current (1,578) (1,532)
Net cash used in operating activities (34,232) (46,531)
Cash flows from investing activities:    
Purchases of property and equipment (30) (168)
Purchases of marketable securities (81,945) (6,726)
Maturities of marketable securities 77,000 39,000
Net cash (used in) provided by investing activities (4,975) 32,106
Cash flows from financing activities:    
Issuance of common stock from At-the-Market Sales Agreement, net of underwriters' fees 1,511 0
Payment of offering costs (175) 0
Proceeds from employee equity plans 117 98
Net cash provided by financing activities 1,453 98
Effect of exchange rate changes on cash 4 (22)
Net decrease in cash, cash equivalents and restricted cash (37,750) (14,349)
Cash, cash equivalents and restricted cash at beginning of period 62,062 50,969
Cash, cash equivalents and restricted cash at end of period 24,312 36,620
Components of cash, cash equivalents and restricted cash    
Cash and cash equivalents 22,764 35,072
Restricted Cash 1,548 1,548
Total cash, cash equivalents and restricted cash at end of period 24,312 36,620
Supplemental noncash investing and financing activities    
Cash paid for taxes 49 86
Property and equipment included in accounts payable and accrued expenses $ 0 $ 27