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Condensed Consolidated Statements of Cash Flows (Unaudited) - USD ($)
$ in Thousands
 3 Months Ended
Mar. 31, 2022
Mar. 31, 2021
Operating activities:    
Net loss $ (16,062) $ (15,622)
Adjustments to reconcile net loss to net cash used in operating activities:    
Provision for losses on accounts receivable (1) 0
Lower of cost or market reserve adjustment to inventory 2,037 937
Depreciation and amortization 6,108 6,444
Amortization of debt issuance costs 211 221
Gain on disposal of assets (39) 0
Share-based compensation 2,472 2,519
Unrealized foreign exchange gain 997 850
Changes in operating assets and liabilities:    
Accounts receivable, trade (223) (4,528)
Notes receivable 6,986 (1,055)
Prepaid income tax 1 0
Inventories (1,978) 2,844
Other current assets (1,422) (76)
Operating right of use asset 243 230
Accounts payable (406) (3,281)
Accrued liabilities (2,271) (4,449)
Lease liability (256) (248)
Net cash used in operating activities (3,603) (15,214)
Investing activities:    
Purchase of property, plant and equipment (1,022) (2,212)
Proceeds from disposal of equipment 115 0
Deposits for equipment (30) (115)
Purchase of intangible assets (114) (95)
Net cash used in investing activities (1,051) (2,422)
Financing activities:    
Principal payments of long-term debt and notes payable (170) (1,029)
Proceeds from line of credit borrowings 41,395 39,512
Repayments of line of credit borrowings (39,062) (26,320)
Proceeds from bank acceptance payable 9,686 4,772
Repayments of bank acceptance payable (7,968) (14,280)
Principal payments of financing lease (5) (4)
Exercise of stock options 0 8
Payments of tax withholding on behalf of employees related to share-based compensation (140) (258)
Proceeds from common stock offering, net 0 15,074
Net cash provided by financing activities 3,736 17,475
Effect of exchange rate changes on cash (110) (615)
Net decrease in cash, cash equivalents and restricted cash (1,028) (776)
Cash, cash equivalents and restricted cash at beginning of period 41,136 50,114
Cash, cash equivalents and restricted cash at end of period 40,108 49,338
Supplemental disclosure of cash flow information:    
Interest, net of amounts capitalized 2,406 2,219
Non-cash investing and financing activities:    
Net change in accounts payable related to property and equipment additions 19 (506)
Net change in deposits and prepaid for equipment related to property and equipment additions $ 13 $ 47