Consolidated Statements of Cash Flows (Unaudited) - USD ($) $ in Thousands	6 Months Ended
	Jun. 30, 2015	Jun. 30, 2014
Cash flows from operating activities
Net loss	$ (16,928)	$ (20,878)
Adjustments to reconcile net loss to net cash (used in) provided by operating activities
Depreciation and amortization	6,602	6,984
Net loss (gain) on disposal of assets	22	(15)
Stock-based compensation	647	811
Deferred taxes	79
Changes in operating assets and liabilities:
Accounts receivable	379	(4,963)
Inventories	124	11,095
Other inventory supplies	875	1,191
Prepaid expenses and other assets	369	(700)
Accounts payable	(1,169)	(127)
Accrued payroll	59	51
Corporate income and franchise taxes	(132)	(61)
Advanced payments	13	(301)
Accrued and other current liabilities	(28)	(30)
Net used in operating activities	(9,088)	(6,943)
Cash flows from investing activities
Purchases of property and equipment	(342)	(4,624)
Proceeds from disposal of assets		15
Purchases of investments	(1,136)	(29,798)
Proceeds from sale of investments	8,500	10,000
Net cash provided by (used in) investing activities	7,022	(24,407)
Cash flows from financing activities
Proceeds from issuance of common stock, net of issuance costs		34,957
Proceeds from exercise of options	4	256
Cash used to settle net equity awards	(8)
Restricted cash	(12)	(32)
Net cash (used in) provided by financing activities	(16)	35,181
Net effect of currency translation	473	(172)
Net (decrease) increase in cash and cash equivalents	(1,609)	3,659
Cash and cash equivalents, beginning of period	24,353	21,071
Cash and cash equivalents, end of period	$ 22,744	$ 24,730