Condensed Consolidated Statements of Cash Flows (Unaudited) - USD ($) $ in Thousands	9 Months Ended
	Sep. 30, 2020	Sep. 30, 2019
Operating activities:
Net loss	$ (45,013)	$ (30,620)
Adjustments to reconcile net income to net cash provided by (used in) operating activities:
Lower of cost or market reserve adjustment to inventory	3,340	6,615
Depreciation and amortization	18,350	17,982
Amortization of debt issuance costs	673	673
Deferred income taxes, net	7,358	(7,710)
Loss on disposal of assets	15	10
Share-based compensation	9,804	8,939
Unrealized foreign exchange gain	(323)	(220)
Changes in operating assets and liabilities:
Accounts receivable, trade	(16,799)	825
Notes receivable	3	(3)
Prepaid income tax	13	426
Inventories	(27,303)	3,197
Other current assets	(2,692)	5,577
Operating right of use asset	189	738
Accounts payable	23,306	(1,836)
Accrued liabilities	(620)	(2,405)
Lease liability	(206)	(777)
Net cash (used in) provided by operating activities	(29,905)	1,411
Investing activities:
Purchase of property, plant and equipment	(12,132)	(25,982)
Proceeds from disposal of equipment	166	2
Deposits and prepaid for equipment	(2,733)	(520)
Purchase of intangible assets	(376)	(497)
Net cash used in investing activities	(15,075)	(26,997)
Financing activities:
Proceeds from issuance of notes payable and long-term debt, net of debt issuance costs	6,229	13,661
Principal payments of long-term debt and notes payable	(4,066)	(42,272)
Proceeds from line of credit borrowings	73,700	59,296
Repayments of line of credit borrowings	(67,430)	(66,299)
Proceeds from bank acceptance payable	26,341	8,214
Repayments of bank acceptance payable	(19,598)	(8,682)
Proceeds from issuance of convertible senior notes, net of debt issuance costs	(18)	76,362
Principal payments of financing lease	(13)	0
Exercise of stock options	14	8
Payments of tax withholding on behalf of employees related to share-based compensation	(813)	(702)
Proceeds from common stock offering, net	22,632	0
Net cash provided by financing activities	36,978	39,586
Effect of exchange rate changes on cash	(958)	372
Net increase (decrease) in cash, cash equivalents and restricted cash	(8,960)	14,372
Cash, cash equivalents and restricted cash at beginning of period	67,028	58,004
Cash, cash equivalents and restricted cash at end of period	58,068	72,376
Supplemental disclosure of cash flow information:
Interest, net of amounts capitalized	4,739	2,933
Income taxes	(192)	(329)
Non-cash investing and financing activities:
Net change in accounts payable related to property and equipment additions	1,173	(4,626)
Net change in deposits and prepaid for equipment related to property and equipment additions	$ 36	$ 6,370