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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 $ (27,220) $ (29,447)
Adjustments to reconcile net loss to net cash used in operating activities:    
Stock-based compensation expense 3,086 3,035
Non-cash operating lease expense 57 88
Accretion of discounts on marketable securities, net (691) (1,240)
Depreciation and amortization expense 71 38
Unrealized foreign currency transaction loss 5 24
Changes in operating assets and liabilities:    
Prepaid expenses and other current assets 1,256 1,272
Other long-term assets 304 (1,352)
Accounts payable (1,209) 165
Accrued expenses and other current liabilities (589) 944
Operating lease liabilities 5 (109)
Net cash used in operating activities (24,925) (26,582)
Cash flow from investing activities:    
Purchases of property and equipment (260) (77)
Purchases of marketable securities (127,460) (79,370)
Proceeds from maturities of marketable securities 57,502 41,482
Net cash used in investing activities (70,218) (37,965)
Cash flows from financing activities    
Proceeds from exercise of stock options 340 0
Proceeds from issuance of common stock in private placement, net of issuance costs 103,368 0
Net cash provided by financing activities 103,708 0
Effect of exchange rate changes on cash and cash equivalents 0 0
Net change in cash and cash equivalents 8,565 (64,547)
Cash and cash equivalents at beginning of period 35,685 87,229
Cash and cash equivalents at end of period 44,250 22,682
Supplemental disclosure of cash flow information:    
Cash paid for leases included in operating cash outflows 146 216
Supplemental disclosure of non-cash investing and financing activities:    
Purchases of property and equipment included in accounts payable and accrued expenses and other current liabilities 218 76
Right-of-use assets obtained in exchange for lease liabilities 1,108 0
Decrease in lease liabilities due to reduction in right-of-use assets from lease modifications 340 0
Deferred offering costs included in accounts payable and accrued expenses and other current liabilities 280 0
Restricted Cash and Cash Equivalent [Abstract]    
Cash and cash equivalents 44,107 22,682
Restricted cash (included in other non-current assets) 143 0
Total cash, cash equivalents and restricted cash $ 44,250 $ 22,682