Consolidated statements of cash flows (unaudited) (USD $) In Thousands, unless otherwise specified	9 Months Ended
	Sep. 30, 2014	Sep. 30, 2013
Cash flows from operating activities
Net loss	$ (34,591)	$ (15,110)
Adjustments to reconcile net loss to net cash (used in) provided by operating activities
Depreciation and amortization	10,321	9,355
Net loss on disposal of assets	665	556
Stock-based compensation	1,081	1,230
Deferred taxes	(363)	(11,302)
Changes in operating assets and liabilities:
Accounts receivable	(2,251)	8,226
Inventories	11,330	7,806
Other inventory supplies	3,404	3,106
Prepaid expenses and other assets	(483)	2,018
Accounts payable	(401)	(4,064)
Accrued payroll	256	(599)
Corporate income and franchise taxes	4	(46)
Advanced payments	(402)	(492)
Accrued and other current liabilities	(60)	(577)
Net cash (used in) provided by operating activities	(11,490)	107
Cash flows from investing activities
Purchases of property and equipment	(6,127)	(7,312)
Proceeds from disposal of assets	15	135
Purchases of investments	(28,359)	(2,030)
Proceeds from sale of investments	15,000	10,337
Net cash (used in) provided by investing activities	(19,471)	1,130
Cash flows from financing activities
Proceeds from issuance of common stock, net of issuance costs	34,957
Proceeds from exercise of options	212	140
Restricted cash	(30)	6
Net cash provided by financing activities	35,139	146
Net effect of currency translation	(105)	622
Net increase in cash and cash equivalents	4,073	2,005
Cash and cash equivalents, beginning of period	21,071	19,573
Cash and cash equivalents, end of period	$ 25,144	$ 21,578