Consolidated Statements of Cash Flows (Unaudited) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2016	Mar. 31, 2015
Cash flows from operating activities
Net loss	$ (7,333)	$ (8,348)
Adjustments to reconcile net loss to net cash used in operating activities
Depreciation and amortization	1,642	3,317
Stock-based compensation	370	334
Deferred taxes	(159)	29
Changes in operating assets and liabilities:
Accounts receivable	(199)	770
Inventories	1,219	647
Other inventory supplies	328	100
Prepaid expenses and other assets	647	332
Accounts payable	123	(1,050)
Accrued payroll	64	(258)
Corporate income and franchise taxes	(148)	(189)
Advanced payments	7	(4)
Accrued and other current liabilities	(948)	313
Net cash used in operating activities	(4,387)	(4,007)
Cash flows from investing activities
Purchases of property and equipment	(549)	(234)
Purchases of investments		(307)
Proceeds from sale of investments	5,785	5,000
Net cash provided by investing activities	5,236	4,459
Cash flows from financing activities
Taxes paid related to net share settlement of equity awards	(1)	(8)
Restricted cash	(16)	4
Net cash used in financing activities	(17)	(4)
Net effect of currency translation	(758)	326
Net increase in cash and cash equivalents	74	774
Cash and cash equivalents, beginning of period	21,216	24,353
Cash and cash equivalents, end of period	$ 21,290	$ 25,127