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CONDENSED CONSOLIDATED STATEMENTS OF CASH FLOWS - USD ($)
$ in Thousands
 9 Months Ended
Sep. 30, 2025
Sep. 30, 2024
Operating activities    
Net loss $ (13,453) $ (18,399)
Adjustments to reconcile net loss to net cash (used in) provided by operating activities:    
Depreciation and amortization 1,033 1,523
Stock-based compensation 17,940 17,363
Non-cash operating lease cost 1,917 1,929
Net loss on sale of available-for-sale securities 5 4
Unrealized gain on investments (198) (218)
Loss on disposal of fixed assets   3
Non-cash interest expense 298 297
Foreign currency remeasurement loss (gain) 147 (141)
Changes in operating assets and liabilities:    
Accounts receivable 212 11,128
Inventories (11,506) 8,020
Prepaid and other assets (2,069) (2,188)
Accounts payable 3,362 (7,825)
Accrued liabilities and other non-current liabilities 66 (4,886)
Deferred revenue 883 (180)
Net cash (used in) provided by operating activities (1,363) 6,430
Investing activities    
Capital expenditures (2,422) (1,861)
Purchases of investments (27,765) (18,741)
Proceeds from maturities and sale of investments 25,400 19,758
Net cash used in investing activities (4,787) (844)
Financing activities    
Net proceeds from equity incentives 595 804
Net costs from public offerings (35) (107)
Net proceeds from (payment on) revolving line of credit 702 (1,479)
Proceeds from loans, net of issuance costs 0 5,000
Net cash provided by financing activities 1,262 4,218
Effect of exchange rates on cash, cash equivalents, and restricted cash 336 46
Net (decrease) increase in cash, cash equivalents, and restricted cash (4,552) 9,850
Cash, cash equivalents, and restricted cash, beginning of period 21,361 13,359
Cash, cash equivalents, and restricted cash, end of period $ 16,809 $ 23,209