Consolidated Statements of Cash Flows (Unaudited) - USD ($) $ in Thousands	9 Months Ended
	Sep. 30, 2017	Sep. 30, 2016
Cash flows from operating activities
Net loss	$ (11,791)	$ (40,343)
Adjustments to reconcile net loss to net cash used in operating activities
Depreciation and amortization	1,023	4,919
Net loss on disposal of assets	1,135	126
Long-lived asset impairment charges	675	10,481
Stock-based compensation	786	1,081
Deferred taxes		(554)
Changes in operating assets and liabilities:
Accounts receivable	1,907	(240)
Inventories	3,907	11,031
Other inventory supplies	314	638
Prepaid expenses and other assets	789	1,638
Accounts payable	(241)	(1,045)
Accrued payroll	16	1,265
Corporate income and franchise taxes	(63)	(42)
Advanced payments	50	457
Accrued and other current liabilities	(140)	(891)
Net cash used in operating activities	(1,633)	(11,479)
Cash flows from investing activities
Purchases of property and equipment		(595)
Proceeds from disposal of assets	2,144	190
Purchases of investments	(24)	(24)
Proceeds from sale of investments	37	8,924
Net cash provided by investing activities	2,157	8,495
Cash flows from financing activities
Net change in short-term borrowings		(1,500)
Taxes paid related to net share settlement of equity awards	(173)	(1)
Restricted cash	(11)	(6)
Net cash used in financing activities	(184)	(1,507)
Net effect of currency translation	9	(355)
Net increase (decrease) in cash and cash equivalents	349	(4,846)
Cash and cash equivalents, beginning of period	17,672	21,216
Cash and cash equivalents, end of period	$ 18,021	$ 16,370