Consolidated Statements of Cash Flows - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2016	Dec. 31, 2015
Cash flows from operating activities
Net loss	$ (62,879)	$ (77,830)
Adjustments to reconcile net loss to net cash (used in) operating activities
Depreciation and amortization	6,100	11,404
Net (gain) loss on disposal of assets	(1,534)	47
Stock-based compensation	1,348	1,250
Long-lived asset impairment charge	26,554	39,597
Deferred taxes	(554)	(39)
Changes in operating assets and liabilities:
Accounts receivable	(847)	6,585
Inventories	13,641	73
Other inventory supplies	4,263	2,166
Prepaid expenses and other assets	1,304	275
Accounts payable	(2,354)	(247)
Accrued payroll	22	(323)
Corporate income and franchise taxes	360	(63)
Accrued real estate taxes	2	(41)
Advance payments	14	(1)
Accrued and other current liabilities	(725)	431
Net cash used in operating activities	(15,285)	(16,716)
Cash flows from investing activities
Purchases of property and equipment	(704)	(941)
Proceeds from disposal of assets	5,344
Purchase of investments	(28)	(2,322)
Proceeds from sale of investments	8,928	14,000
Net cash provided by investing activities	13,540	10,737
Cash flows from financing activities
Proceeds from exercise of options		4
Restricted cash	7	13
Net change in short-term borrowings	(1,500)	1,500
Taxes paid related to net share settlement of equity awards	(8)	(8)
Net cash (used in) provided by financing activities	(1,501)	1,509
Net effect of currency translation	(298)	1,333
Net decrease in cash and cash equivalents	(3,544)	(3,137)
Cash and cash equivalents, beginning of year	21,216	24,353
Cash and cash equivalents, end of year	17,672	21,216
Supplemental disclosure of cash flow information
Cash paid for interest	$ 99	$ 109