Consolidated Statements of Cash Flows - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2017	Dec. 31, 2016
Cash flows from operating activities
Net loss	$ (17,851)	$ (62,879)
Adjustments to reconcile net loss to net cash (used in) operating activities
Depreciation and amortization	1,173	6,100
Net (gain) loss on disposal of assets	1,118	(1,534)
Stock-based compensation	897	1,348
Long-lived asset impairment charge	5,051	26,554
Deferred taxes		(554)
Changes in operating assets and liabilities:
Accounts receivable	1,867	(847)
Inventories	4,970	13,641
Other inventory supplies	605	4,263
Prepaid expenses and other assets	978	1,304
Accounts payable	(369)	(2,354)
Accrued payroll	(85)	22
Corporate income and franchise taxes	(273)	360
Accrued real estate taxes	8	2
Advance payments	36	14
Accrued and other current liabilities	(159)	(725)
Net cash (used in) operating activities	(2,034)	(15,285)
Cash flows from investing activities
Purchases of property and equipment		(704)
Proceeds from disposal of assets	2,561	5,344
Purchase of investments	(6,498)	(28)
Proceeds from sale of investments	57	8,928
Net cash (used in) provided by investing activities	(3,880)	13,540
Cash flows from financing activities
Restricted cash	(18)	7
Net change in short-term borrowings		(1,500)
Taxes paid related to net share settlement of equity awards	(189)	(8)
Net cash (used in) financing activities	(207)	(1,501)
Net effect of currency translation	(7)	(298)
Net decrease in cash and cash equivalents	(6,128)	(3,544)
Cash and cash equivalents, beginning of year	17,672	21,216
Cash and cash equivalents, end of year	11,544	17,672
Supplemental disclosure of cash flow information
Cash paid for interest		$ 99