Consolidated Statements of Cash Flows (Unaudited) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2017	Mar. 31, 2016
Cash flows from operating activities
Net loss	$ (5,074)	$ (7,333)
Adjustments to reconcile net loss to net cash used in operating activities
Depreciation and amortization	570	1,642
Net loss on disposal of assets	749
Stock-based compensation	398	370
Deferred taxes		(159)
Changes in operating assets and liabilities:
Accounts receivable	1,825	(199)
Inventories	773	1,219
Other inventory supplies	46	328
Prepaid expenses and other assets	(198)	647
Accounts payable	(227)	123
Accrued payroll	386	64
Corporate income and franchise taxes	(111)	(148)
Advanced payments	(4)	7
Accrued and other current liabilities	(9)	(948)
Net cash used in operating activities	(876)	(4,387)
Cash flows from investing activities
Purchases of property and equipment		(549)
Proceeds from disposal of assets	1,594
Purchases of investments	4
Proceeds from sale of investments	8	5,785
Net cash provided by investing activities	1,606	5,236
Cash flows from financing activities
Taxes paid related to net share settlement of equity awards	(8)	(1)
Restricted cash	(2)	(16)
Net cash used in financing activities	(10)	(17)
Net effect of currency translation	(25)	(758)
Net increase in cash and cash equivalents	695	74
Cash and cash equivalents, beginning of period	17,672	21,216
Cash and cash equivalents, end of period	$ 18,367	$ 21,290