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Condensed Consolidated Statements of Cash Flows - USD ($)
$ in Thousands
 9 Months Ended
Sep. 30, 2025
Sep. 30, 2024
Cash flows from operating activities:    
Net loss $ (19,538) $ (24,072)
Adjustments to reconcile net loss to net cash used in operating activities:    
Stock-based compensation 2,245 3,042
Depreciation and amortization 2,047 3,088
Reversal of uncertain tax positions (261) (3)
Deferred income tax expense (122) (86)
Loss on asset disposal 34 0
Changes in operating assets and liabilities:    
Accounts receivable, net 121 5,578
Inventories 1,061 (430)
Prepaid expenses and other current and long-term assets, net 1,230 3,287
Accounts payable 283 (475)
Accrued current and long-term liabilities (1,125) (4,261)
Income taxes payable (103) 126
Net cash used in operating activities (14,128) (14,206)
Cash flows from investing activities:    
Asset related government subsidies received 754
Purchases of property and equipment (403) (3,647)
Net cash provided by (used in) investing activities 351 (3,647)
Cash flows from financing activities:    
Net proceeds from "at the market" equity offering 2,952 0
Proceeds from short-term line of credit 1,404 0
Net proceeds from "registered direct offering" 1,341
Payments on asset financings (1,004) (1,041)
Proceeds from issuance of common stock under employee equity incentive plans 48 180
Net cash provided by (used in) financing activities 4,741 (861)
Net decrease in cash and cash equivalents (9,036) (18,714)
Cash and cash equivalents, beginning of period 23,647 47,544
Cash and cash equivalents, end of period 14,611 28,830
Supplemental disclosure of cash flow information:    
Cash paid during the period for income taxes, net of refunds received 499 225
Cash paid during the period for interest 99 78
Non-cash investing and financing activities:    
Acquisitions of property and equipment and other assets, unpaid at period end. $ 6 $ 554