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Consolidated Statements of Cash Flows - USD ($)
$ in Thousands
 12 Months Ended
Dec. 31, 2025
Dec. 31, 2024
Cash Flows from Operating Activities    
Net loss $ (93,410) $ (96,520)
Adjustments to reconcile net loss to net cash and cash equivalents used in operating activities:    
Depreciation and amortization 18,422 16,464
Amortization of right-of-use assets 1,370 900
Loss on sales of property, plant, and equipment 574 1,957
Gain on sales of property, plant, and equipment (20)  
Loss on extinguishment of note receivable   760
Share of net loss (income) of equity method investee (65) 133
Stock-based compensation expense 8,990 11,972
Change in fair value of warrant liabilities 5,146 4,508
Accretion of discounts on other long-term liabilities 65 78
Accretion of loan receivable from equity method investee (131) (24)
Amortization of premiums and accretion of discounts on available-for-sale securities (4,691) (7,805)
Loss on change in assessment of finance lease purchase options 84  
Impairment loss on abandoned patents 748  
Change in operating assets and liabilities that provided (used) cash and cash equivalents:    
Accounts receivable 278 160
Contract assets (7,490)  
Prepaid expenses and other current assets and other assets (366) 710
Accounts payable and other accrued liabilities 1,416 1,268
Deferred revenue (2,952) 3,150
Deferred revenue from related parties 172 (828)
Accrued compensation (537) (11)
Operating lease liabilities (996) (771)
Net cash and cash equivalents used in operating activities (73,393) (63,899)
Cash Flows from Investing Activities    
Purchases of property, plant and equipment (10,209) (15,942)
Purchases of available-for-sale securities (277,726) (216,193)
Proceeds from sales of available-for-sale securities 268,891 302,966
Proceeds from sales of property, plant and equipment 20 77
Cash paid for loan receivable from equity method investee   (5,610)
Cash paid for equity method investment   (656)
Purchases of intangible assets (873) (438)
Net cash and cash equivalents provided by (used in) investing activities (19,897) 64,204
Cash Flows from Financing Activities    
Proceeds from exercise of stock options 5,259 273
Proceeds from issuance of shares of common stock under the ESPP 365 412
Cash paid for withholding of employee taxes related to stock-based compensation (1,031) (615)
Repurchase of shares of common stock (3,592) (9,072)
Proceeds from the ATM, net of commissions 89,391  
Offering costs for the issuance of common stock under the ATM (624)  
Payments on finance lease liabilities (284) (427)
Net cash and cash equivalents provided by (used in) financing activities 89,484 (9,429)
Net decrease in cash and cash equivalents (3,806) (9,124)
Cash and cash equivalents at beginning of period 25,413 34,537
Cash and cash equivalents at end of period 21,607 25,413
Supplemental information    
Cash paid for interest 26 46
Accrued capital expenditures 103 1,196
Unpaid reimbursement on capital expenditures 1,039  
Accrued offering costs for the issuance of common stock under the ATM $ 5  
Accrued excise tax on stock repurchases   $ 90