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CONDENSED STATEMENTS OF CASH FLOWS - USD ($)
$ in Thousands
 3 Months Ended 12 Months Ended
Mar. 31, 2026
Mar. 31, 2025
Dec. 31, 2025
Cash flows from operating activities      
Net loss $ (13,818) $ (8,823)  
Adjustments to reconcile net loss to net cash used in operating activities      
Depreciation expense 318 124  
Non-cash lease expense 63 99  
Stock-based compensation 1,675 345  
Change in fair value of redeemable convertible preferred stock tranche liability 0 1,526  
Interest receivable (31) 0  
Changes in:      
Other receivables (222) (205)  
Prepaid expenses and other current assets (805) 157  
Other non-current assets (298) (26)  
Accounts payable 953 (372)  
Payroll-related accruals (1,300) (883)  
Other current liabilities (104) (35)  
Lease liability 25 (108)  
Net cash used in operating activities (13,544) (8,201)  
Cash flows from investing activities      
Property and equipment (676) (164)  
Purchases of short-term investments (4,000) 0  
Redemptions of short-term investments 3,009 0  
Net cash used in investing activities (1,667) (164)  
Cash flows from financing activities      
Proceeds from exercise of stock options 55 100  
Gross proceeds from issuance of redeemable convertible preferred stock 0 50,010  
Issuance costs of redeemable convertible preferred stock 0 (14)  
Gross proceeds from initial public offering of common stock, net of underwriting discounts and commissions 160,425 0  
Payments for deferred initial public offering costs (2,725) 0  
Net cash provided by financing activities 157,755 50,096  
Net increase in cash and cash equivalents 142,544 41,731  
Cash and cash equivalents, beginning of period 96,358 16,268 $ 16,268
Cash and cash equivalents, end of period 238,902 57,999 $ 96,358
Supplemental cash flow information      
Cash paid for taxes 0 4  
Conversion of redeemable convertible preferred stock upon initial public offering 204,537 0  
Settlement of redeemable convertible preferred stock tranche liability 0 4,943  
Purchases of property and equipment included in accounts payable and other current liabilities 296 36  
Deferred offering costs included in accounts payable and other current liabilities $ 17 $ 0