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CONDENSED CONSOLIDATED STATEMENTS OF CASH FLOWS - USD ($)
$ in Thousands
 9 Months Ended
Sep. 30, 2023
Sep. 30, 2022
Operating activities    
Net loss $ (36,258) $ (29,200)
Adjustments to reconcile net loss to net cash used in operating activities:    
Depreciation and amortization 1,952 2,335
Stock-based compensation 15,368 17,201
Non-cash operating lease cost 1,563 1,028
Changes in valuation of warrant investment   245
Net gain on sale of available-for-sale securities 50 102
Unrealized gain on investments (1) (484)
Impairment of long-lived assets   542
Impairment charges for facilities consolidation 1,698  
Non-cash interest expense 290 474
Foreign currency remeasurement (gain) loss (1,396) 540
Changes in operating assets and liabilities:    
Accounts receivable 9,687 (3,168)
Inventories (19,519) (2,519)
Prepaid and other assets (1,509) 1,509
Accounts payable 8,089 (5,370)
Accrued liabilities and other non-current liabilities (8,346) (7,175)
Deferred product revenue 347 81
Net cash used in operating activities (27,985) (23,859)
Investing activities    
Capital expenditures (4,603) (765)
Purchases of investments (2,404) (22,657)
Proceeds from maturities and sale of investments 7,415 24,503
Net cash provided by investing activities 408 1,081
Financing activities    
Net proceeds from equity incentives 925 3,594
Net costs from public offerings (137) (42)
Net proceeds on revolving line of credit 3,870 183
Proceeds from loans 5,000  
Debt issuance costs (168)  
Net cash provided by financing activities 9,490 3,735
Effect of exchange rates on cash, cash equivalents, and restricted cash (112) (1,128)
Net decrease in cash, cash equivalents, and restricted cash (18,199) (20,171)
Cash, cash equivalents and restricted cash, beginning of period 37,358 51,044
Cash, cash equivalents and restricted cash, end of period $ 19,159 $ 30,873