Consolidated Statements of Cash Flows (Unaudited) - USD ($) $ in Thousands	6 Months Ended
	Jun. 30, 2016	Jun. 30, 2015
Cash flows from operating activities
Net loss	$ (15,542)	$ (16,928)
Adjustments to reconcile net loss to net cash used in operating activities
Depreciation and amortization	3,291	6,602
Net loss on disposal of assets	126	22
Asset impairment charge	265
Stock-based compensation	731	647
Deferred taxes	(337)	79
Changes in operating assets and liabilities:
Accounts receivable	(999)	379
Inventories	693	124
Other inventory supplies	232	875
Prepaid expenses and other assets	1,164	369
Accounts payable	330	(1,169)
Accrued payroll	49	59
Corporate income and franchise taxes	(97)	(132)
Advanced payments	20	13
Accrued and other current liabilities	(919)	(28)
Net used in operating activities	(10,993)	(9,088)
Cash flows from investing activities
Purchases of property and equipment	(660)	(342)
Proceeds from disposal of assets	190
Purchases of investments	(18)	(1,136)
Proceeds from sale of investments	7,912	8,500
Net cash provided by investing activities	7,424	7,022
Cash flows from financing activities
Proceeds from exercise of options		4
Taxes paid related to net share settlement of equity awards	(1)	(8)
Restricted cash	(12)	(12)
Net cash used in financing activities	(13)	(16)
Net effect of currency translation	(567)	473
Net decrease in cash and cash equivalents	(4,149)	(1,609)
Cash and cash equivalents, beginning of period	21,216	24,353
Cash and cash equivalents, end of period	$ 17,067	$ 22,744