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Condensed Consolidated Statement of Cash Flows - USD ($)
$ in Thousands
 9 Months Ended
Sep. 30, 2025
Sep. 30, 2024
Cash flows from operating activities:    
Net loss $ (77,872) $ (75,332)
Adjustments to reconcile net loss to net cash used in operating activities:    
Depreciation and amortization 126 99
Unrealized foreign currency gain 0 (91)
Stock-based compensation 7,555 6,542
Non-cash lease expense 156 355
Change in fair value of tranche rights 0 4,796
Fees expensed as part of January 2024 Financing 0 1,690
Changes in operating assets and liabilities:    
Other current assets and prepaid expenses (45) 1,460
Accounts payable (927) 871
Accrued expenses 4,875 (1,900)
Operating lease liabilities (168) (373)
Other liabilities (225) 80
Net cash used in operating activities (66,525) (61,803)
Cash flows from investing activities:    
Purchases of property and equipment (150) (261)
Net cash used in investing activities (150) (261)
Cash flows from financing activities:    
Proceeds from public offering of common stock through At The Market Sales Agreement, net 0 191
Proceeds from shares issued in connection with the Company's Employee Stock Purchase Plan 123 0
Net cash provided by financing activities 65,518 74,464
Effect of exchange rate changes on cash and cash equivalents 621 (3)
Net change in cash and cash equivalents (536) 12,397
Cash and cash equivalents, beginning of period 35,668 46,674
Cash and cash equivalents, end of period 35,132 59,071
Supplemental disclosure of noncash investing and financing activities:    
Conversion of tranche rights liability to equity upon increase in authorized shares 0 28,396
May 2025 PIPE Transaction    
Cash flows from financing activities:    
Proceeds from offering, net of issuance costs 60,661 0
April 2025 PIPE Transaction    
Cash flows from financing activities:    
Proceeds from offering, net of issuance costs 4,734 0
January 2024 PIPE Transaction    
Cash flows from financing activities:    
Proceeds from offering, net of issuance costs $ 0 $ 74,273