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CONSOLIDATED STATEMENTS OF CASH FLOWS - USD ($)
$ in Thousands
 12 Months Ended
Dec. 31, 2025
Dec. 31, 2024
Dec. 31, 2023
Cash flows from operating activities:      
Net loss $ (145,428) $ (152,261) $ (149,333)
Adjustments to reconcile net loss to net cash used in operating activities:      
Depreciation and amortization 5,381 5,480 4,622
Impairment of inventories 493 1,140 224
Loss on joint development agreement (2) 3,785 0 0
Fair value at issuance of Series A warrants 0 0 6,500
Change in fair value of warrant liabilities 21,453 1,486 182
Stock-based compensation 21,843 23,708 23,675
Amortization of right-of-use assets 3,106 3,463 3,108
Amortization of premium and accretion of discount on available-for-sale securities, net (1,050) (3,537) (2,973)
Other 423 563 0
Changes in operating assets and liabilities:      
Accounts receivable, net (2,537) (559) 2,259
Inventories (3,936) (1,111) 353
Other current assets (8,715) (2,566) 279
Other noncurrent assets 288 318 (270)
Accounts payable (504) 1,835 (1,592)
Accrued liabilities 3,314 2,334 (6,415)
Accrued employee costs 8,162 (260) 1,322
Lease liability (2,818) (3,595) (3,097)
Other current liabilities (18,337) 16,649 2,330
Net cash used in operating activities (115,077) (106,913) (118,826)
Cash flows from investing activities:      
Purchase of property, plant, and equipment (including advance) (4,609) (5,107) (6,104)
Purchase of non-marketable equity investments 0 0 (5,000)
Purchase of available-for-sale securities (75,014) (79,980) (152,364)
Proceeds from maturities of available-for-sale securities 109,549 182,988 232,745
Net cash provided by investing activities 29,926 97,901 69,277
Cash flows from financing activities:      
Proceeds from issuance of stock in private placement 32,500 0 21,455
Transaction costs related to business combination and private offering (400)    
Transaction costs related to issuance of stock in private placement   0 (818)
Proceeds from convertible notes 100,000 0 0
Transaction costs related to convertible notes (3,072) 0 0
Payments of taxes withheld on net settled vesting of restricted stock units (578) (752) (199)
Proceeds from exercise of stock options 128 81 238
Net cash (used in) provided by financing activities 128,578 (671) 20,676
Net increase (decrease) in cash and cash equivalents 43,427 (9,683) (28,873)
Beginning cash and cash equivalents 28,864 38,547 67,420
Ending cash and cash equivalents 72,291 28,864 38,547
Supplemental disclosures of cash flow information:      
Cash paid for interest 0 0 0
Cash paid for income taxes 174 165 0
Supplemental disclosure of noncash investing and financing activities:      
Unpaid property, plant and equipment purchases 727 835 90
Joint development contract assets 7,500 0 0
Convertible debt issuance cost included in accounts payable 297 0 0
Right-of-use asset obtained in exchange for lease liability $ 4,760 $ 0 $ 2,995