Consolidated statements of cash flows (unaudited) (USD $) In Thousands, unless otherwise specified	6 Months Ended
	Jun. 30, 2014	Jun. 30, 2013
Cash flows from operating activities
Net loss	$ (20,878)	$ (9,270)
Adjustments to reconcile net loss to net cash (used in) provided by operating activities
Depreciation and amortization	6,984	6,222
Net (gain) loss on disposal of assets	(15)	427
Stock-based compensation	811	748
Deferred taxes	0	(7,328)
Changes in operating assets and liabilities:
Accounts receivable	(4,963)	9,566
Inventories	11,095	3,356
Other inventory supplies	1,191	2,430
Prepaid expenses and other assets	(700)	2,081
Accounts payable	(127)	(6,085)
Accrued payroll	51	(577)
Corporate income and franchise taxes	(61)	(103)
Advanced payments	(301)	(570)
Accrued and other current liabilities	(30)	(528)
Net cash (used in) provided by operating activities	(6,943)	369
Cash flows from investing activities
Purchases of property and equipment	(4,624)	(3,139)
Proceeds from disposal of assets	15
Purchases of investments	(29,798)	(2,019)
Proceeds from sale of investments	10,000	7,632
Net cash (used in) provided by investing activities	(24,407)	2,474
Cash flows from financing activities
Proceeds from issuance of common stock, net of issuance costs	34,957
Proceeds from exercise of options	256	27
Restricted cash	(32)	5
Net cash provided by financing activities	35,181	32
Net effect of currency translation	(172)	331
Net increase in cash and cash equivalents	3,659	3,206
Cash and cash equivalents, beginning of period	21,071	19,573
Cash and cash equivalents, end of period	$ 24,730	$ 22,779