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CONDENSED CONSOLIDATED STATEMENTS OF CASH FLOWS - USD ($)
$ in Thousands
 6 Months Ended
Jun. 30, 2023
Jun. 30, 2022
Operating activities    
Net loss $ (28,972) $ (20,679)
Adjustments to reconcile net loss to net cash used in operating activities:    
Depreciation and amortization 1,275 1,627
Stock-based compensation 11,389 11,433
Non-cash operating lease cost 1,058 704
Changes in valuation of warrant investment   236
Net gain on sale of available-for-sale securities 46 91
Unrealized gain on investments (115) (587)
Impairment of long-lived assets   542
Impairment charges for facilities consolidation 205  
Non-cash interest expense 199 326
Foreign currency remeasurement (gain) loss (1,030) 571
Changes in operating assets and liabilities:    
Accounts receivable 12,164 (1,844)
Inventories (11,345) (2,722)
Prepaid and other assets 230 1,677
Accounts payable 6,533 (6,013)
Accrued liabilities and other non-current liabilities (9,905) (7,465)
Deferred product revenue 772 302
Net cash used in operating activities (17,496) (21,801)
Investing activities    
Capital expenditures (1,968) (191)
Purchases of investments (2,351) (13,216)
Proceeds from maturities and sale of investments 5,002 16,554
Net cash provided by investing activities 683 3,147
Financing activities    
Net proceeds from equity incentives 492 2,512
Net costs from public offerings (137) (94)
Net proceeds on revolving line of credit 1,633 233
Debt issuance costs (100)  
Net cash provided by financing activities 1,888 2,651
Effect of exchange rates on cash, cash equivalents, and restricted cash (5) (718)
Net decrease in cash, cash equivalents, and restricted cash (14,930) (16,721)
Cash, cash equivalents and restricted cash, beginning of period 37,358 51,044
Cash, cash equivalents and restricted cash, end of period $ 22,428 $ 34,323