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Condensed Consolidated Statements of Cash Flows (Unaudited) - USD ($)
$ in Thousands
 3 Months Ended
Mar. 31, 2023
Mar. 31, 2022
Operating activities:    
Net loss $ (16,292) $ (16,062)
Adjustments to reconcile net loss to net cash used in operating activities:    
Allowance of bad debt 11 (1)
Inventory reserve adjustment 2,588 2,037
Depreciation and amortization 5,329 6,108
Amortization of debt issuance costs 306 211
Gain (loss) on disposal of assets 3 (39)
Share-based compensation 2,290 2,472
Unrealized foreign exchange (gain) loss (1,065) 997
Changes in operating assets and liabilities:    
Accounts receivable, trade 4,365 (223)
Notes receivable (742) 6,986
Prepaid income tax 0 1
Inventories 7,403 (1,978)
Other current assets (80) (1,422)
Operating right of use asset 230 243
Accounts payable (9,427) (406)
Accrued liabilities (3,815) (2,271)
Unearned revenue (237) 0
Lease liability (257) (256)
Net cash used in operating activities (9,390) (3,603)
Investing activities:    
Purchase of property, plant and equipment (575) (1,022)
Proceeds from disposal of equipment 65 115
Deposits and prepaid for equipment (160) (30)
Purchase of intangible assets (113) (114)
Net cash used in investing activities (783) (1,051)
Financing activities:    
Principal payments of long-term debt and notes payable 0 (170)
Proceeds from line of credit borrowings 19,482 41,395
Repayments of line of credit borrowings (25,402) (39,062)
Proceeds from bank acceptance payable 18,974 9,686
Repayments of bank acceptance payable (12,293) (7,968)
Principal payments of financing lease (5) (5)
Payments of tax withholding on behalf of employees related to share-based compensation (75) (140)
Proceeds from common stock offering, net 407 0
Net cash provided by financing activities 1,088 3,736
Effect of exchange rate changes on cash 446 (110)
Net decrease in cash, cash equivalents and restricted cash (8,639) (1,028)
Cash, cash equivalents and restricted cash at beginning of period 35,587 41,136
Cash, cash equivalents and restricted cash at end of period 26,948 40,108
Supplemental disclosure of cash flow information:    
Interest, net of amounts capitalized 2,304 2,406
Non-cash investing and financing activities:    
Net change in accounts payable related to property and equipment additions (20) 19
Net change in deposits and prepaid for equipment related to property and equipment additions $ (93) $ 13