Condensed Consolidated Statements of Cash Flows (Unaudited) - USD ($) $ in Thousands	6 Months Ended
	Jun. 30, 2021	Jun. 30, 2020
Operating activities:
Net loss	$ (23,825)	$ (35,397)
Adjustments to reconcile net income to net cash provided by (used in) operating activities:
Provision for losses on accounts receivable	0	1
Lower of cost or market reserve adjustment to inventory	2,211	2,924
Depreciation and amortization	12,870	12,154
Amortization of debt issuance costs	434	444
Deferred income taxes, net	0	5,147
Loss on disposal of assets	5	9
Share-based compensation	5,793	6,540
Interest for Extinguishment of Debt	(70)	0
Extinguishment of Debt	(6,229)	0
Unrealized foreign exchange gain	692	(134)
Changes in operating assets and liabilities:
Accounts receivable, trade	(5,362)	(9,690)
Notes receivable	(3,390)	(49)
Prepaid income tax	0	13
Inventories	8,934	(15,362)
Other current assets	72	(725)
Operating right of use asset	381	300
Accounts payable	(3,889)	12,688
Accrued liabilities	(3,082)	(2,323)
Lease liability	(427)	(309)
Net cash used in operating activities	(14,882)	(23,769)
Investing activities:
Purchase of property, plant and equipment	(3,582)	(6,759)
Proceeds from disposal of equipment	110	52
Deposits and prepaid for equipment	(272)	(2,304)
Purchase of intangible assets	(188)	(208)
Net cash used in investing activities	(3,932)	(9,219)
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	(2,227)	(2,221)
Proceeds from line of credit borrowings	66,742	52,637
Repayments of line of credit borrowings	(50,119)	(48,689)
Proceeds from bank acceptance payable	10,722	14,080
Repayments of bank acceptance payable	(20,206)	(10,377)
Proceeds from issuance of convertible senior notes, net of debt issuance costs	0	(16)
Principal payments of financing lease	(9)	(8)
Exercise of stock options	8	3
Payments of tax withholding on behalf of employees related to share-based compensation	(402)	(466)
Proceeds from common stock offering, net	15,336	13,929
Net cash provided by financing activities	19,845	25,101
Effect of exchange rate changes on cash	(646)	(232)
Net decrease in cash, cash equivalents and restricted cash	385	(8,119)
Cash, cash equivalents and restricted cash at beginning of period	50,114	67,028
Cash, cash equivalents and restricted cash at end of period	50,499	58,909
Supplemental disclosure of cash flow information:
Interest, net of amounts capitalized	2,394	2,478
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	(2,341)	(785)
Net change in deposits and prepaid for equipment related to property and equipment additions	$ 35	$ 1,327