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CONDENSED CONSOLIDATED STATEMENTS OF CASH FLOWS - USD ($)
$ in Thousands
 6 Months Ended
Jun. 30, 2026
Jun. 30, 2025
Cash flows from operating activities    
Net loss $ (73,406) $ (29,531)
Adjustments to reconcile net loss to net cash used in operating activities:    
Depreciation and amortization 221 55
Loss on impairment of operating right-of-use assets and related property and equipment 0 82
Accretion of discounts and amortization of premiums on marketable securities, net (447) (2,022)
Gain on long-term investments 0 (204)
Write-off of nonsalable inventory 414 0
Share-based compensation expense 8,791 5,400
Changes in operating assets and liabilities:    
Accounts receivable, net (113) 0
Inventory (870) 0
Prepaid expenses and other current assets (2,916) (1,196)
Accounts payable 2,481 (1,628)
Accrued liabilities (7,224) 1,487
Deferred revenue 785 0
Operating lease liabilities, net (32) 0
Other assets 21 0
Net cash used in operating activities (72,295) (27,557)
Cash flows from investing activities    
Purchases of marketable securities (23,430) (91,385)
Proceeds from maturities of marketable securities 94,379 110,210
Purchases of property and equipment (34) (350)
Net cash provided by investing activities 70,915 18,475
Cash flows from financing activities    
Proceeds from exercises of stock options 14 240
Proceeds from issuance of common stock under employee stock purchase plan 395 225
Net cash provided by financing activities 409 26,532
Net (decrease) increase in cash, cash equivalents and restricted cash (971) 17,450
Cash, cash equivalents and restricted cash, beginning of the period 25,179 20,272
Cash, cash equivalents and restricted cash, end of the period 24,208 37,722
Supplemental Cash Flow Information [Abstract]    
Property and equipment included in accounts payable 0 225
At The Market Offerings    
Cash flows from financing activities    
Proceeds from issuance of common stock through at-the-market offerings, net of issuance costs $ 0 $ 26,067