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Condensed Consolidated Statements of Cash Flows - USD ($)
$ in Thousands
 9 Months Ended
Sep. 30, 2023
Sep. 30, 2022
Cash flows from operating activities:    
Net loss $ (23,211) $ (13,626)
Adjustments to reconcile net loss to net cash used in operating activities:    
Stock-based compensation 3,677 4,038
Depreciation and amortization 3,211 3,490
Deferred income tax expense 314 396
Reversal of uncertain tax positions (2) (121)
Amortization of acquired intangible assets 0 90
Changes in operating assets and liabilities:    
Accounts receivable, net (118) (2,062)
Inventories (4,145) (1,247)
Prepaid expenses and other current and long-term assets, net 4,683 3,131
Accounts payable 1,133 (276)
Accrued current and long-term liabilities (2,268) (5,084)
Income taxes payable (300) (232)
Net cash used in operating activities (17,026) (11,503)
Cash flows from investing activities:    
Purchases of property and equipment (3,440) (1,287)
Purchases of licensed technology 0 (1,415)
Net cash used in investing activities (3,440) (2,702)
Cash flows from financing activities:    
Net proceeds from issuance of equity interest to non-controlling interest 14,596 10,738
Payments on asset financings (932) (892)
Proceeds from issuance of common stock under employee equity incentive plans 299 387
Net cash provided by financing activities 13,963 10,233
Net decrease in cash and cash equivalents (6,503) (3,972)
Cash and cash equivalents, beginning of period 56,821 61,587
Cash and cash equivalents, end of period 50,318 57,615
Supplemental disclosure of cash flow information:    
Cash paid during the period for income taxes, net of refunds received 302 17
Cash paid during the period for interest 116 153
Non-cash investing and financing activities:    
Acquisitions of property and equipment and other assets under extended payment terms $ 1,980 $ 160