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Condensed Statements of Cash Flows (Unaudited) - USD ($)
$ in Thousands
 9 Months Ended
Sep. 30, 2025
Sep. 30, 2024
Cash flows from operating activities:    
Net loss $ (62,162) $ (102,338)
Adjustments to reconcile net loss to net cash used in operating activities:    
Stock-based compensation expense 11,553 24,411
Depreciation and amortization 3,460 4,322
Non-cash lease expense 1,173 1,063
Non-cash interest expense 2,045 1,898
Amortization of premium on investments, net (1,717) (3,890)
Change in provision for inventories (203) 644
Loss on disposal of property and equipment 5 34
Change in provision for credit losses 650 1,813
Loss on extinguishment of term loan 7,685 0
Changes in operating assets and liabilities:    
Accounts receivable 2,007 (3,092)
Inventories 10,301 (12,989)
Prepaid expenses and other assets 360 1,848
Accounts payable (2,164) (1,507)
Accrued compensation and related benefits (5,966) (3,991)
Accrued expenses and other current liabilities (1,216) (6,327)
Accrued warranty liability (575) (1,556)
Deferred revenue 1,979 1,015
Operating lease liabilities (1,326) (1,173)
Accrued interest (2,695) 0
Net cash used in operating activities (36,806) (99,815)
Cash flows from investing activities:    
Purchases of property and equipment (575) (869)
Purchases of investment securities (193,748) (150,467)
Sales and maturities of investment securities 88,049 147,121
Net cash used in investing activities (106,274) (4,215)
Cash flows from financing activities:    
Proceeds from stock option exercises and ESPP purchases 639 2,284
Proceeds from issuance of term loans, net of issuance costs 98,270 66,524
Repayment of term loan and extinguishment costs (204,954) 0
Proceeds from issuance of Series A convertible preferred stock, net of issuance costs 161,548 0
Net cash provided by financing activities 55,503 68,808
Net decrease in cash, cash equivalents and restricted cash (87,577) (35,222)
Cash, cash equivalents and restricted cash as of beginning of period 127,343 71,838
Cash, cash equivalents and restricted cash as of end of period 39,766 36,616
Summary of cash, cash equivalents and restricted cash reported within the balance sheets:    
Cash and cash equivalents 36,437 33,287
Restricted cash 3,329 3,329
Total cash, cash equivalents and restricted cash 39,766 36,616
Supplemental cash flow disclosures:    
Cash paid for income taxes 328 472
Cash paid for interest 12,906 15,537
Cash paid for amounts included in the measurement of operating lease liabilities 1,326 1,173
Supplemental non-cash investing and financing activities:    
Transfer of inventories to property and equipment 0 148
Fair value of common stock warrant $ 4,367 $ 0