Condensed Consolidated Statements of Cash Flows (Unaudited) - USD ($) $ in Thousands	9 Months Ended
	Sep. 30, 2021	Sep. 30, 2020
Operating activities:
Net loss	$ (39,622)	$ (45,013)
Adjustments to reconcile net loss to net cash used in operating activities:
Inventory, LIFO Reserve, Period Charge	3,335	3,340
Depreciation and amortization	19,188	18,350
Amortization of debt issuance costs	650	673
Deferred income taxes, net	0	7,358
Loss on disposal of assets	3	15
Share-based compensation	8,922	9,804
Interest for extinguishment of debt	(70)	0
Extinguishment of debt	(6,229)	0
Unrealized foreign exchange gain	1,021	(323)
Changes in operating assets and liabilities:
Accounts receivable, trade	(900)	(16,799)
Notes receivable	(8,102)	3
Prepaid income tax	0	13
Inventories	13,551	(27,303)
Other current assets	448	(2,692)
Operating right of use asset	609	189
Accounts payable	(1,149)	23,306
Accrued liabilities	(2,372)	(620)
Lease liability	(666)	(206)
Net cash used in operating activities	(11,383)	(29,905)
Investing activities:
Purchase of property, plant and equipment	(5,555)	(12,132)
Proceeds from disposal of equipment	111	166
Deposits for equipment	(2,141)	(2,733)
Purchase of intangible assets	(324)	(376)
Net cash used in investing activities	(7,909)	(15,075)
Financing activities:
Proceeds from issuance of notes payable and long-term debt, net of debt issuance costs	0	6,229
Principal payments of long-term debt and notes payable	(3,276)	(4,066)
Proceeds from line of credit borrowings	103,925	73,700
Repayments of line of credit borrowings	(86,922)	(67,430)
Proceeds from bank acceptance payable	16,702	26,341
Repayments of bank acceptance payable	(26,150)	(19,598)
Proceeds from issuance of convertible senior notes, net of debt issuance costs	0	(18)
Principal payments of financing lease	(13)	(13)
Exercise of stock options	8	14
Payments of tax withholding on behalf of employees related to share-based compensation	(696)	(813)
Proceeds from common stock offering, net	15,397	22,632
Net cash provided by financing activities	18,975	36,978
Effect of exchange rate changes on cash	(900)	(958)
Net decrease in cash, cash equivalents and restricted cash	(1,217)	(8,960)
Cash, cash equivalents and restricted cash at beginning of period	50,114	67,028
Cash, cash equivalents and restricted cash at end of period	48,897	58,068
Supplemental disclosure of cash flow information:
Interest, net of amounts capitalized	4,691	4,739
Income taxes	1	(192)
Non-cash investing and financing activities:
Extinguishment of Debt and interest	(6,299)	0
Purchase of property and equipment with line of credit borrowings	0	941
Net change in accounts payable related to property and equipment additions	(4,147)	1,173
Net change in deposits and prepaid for equipment related to property and equipment additions	$ 83	$ 36