Consolidated statements of cash flows (unaudited) (USD $) In Thousands, unless otherwise specified	3 Months Ended
	Mar. 31, 2014	Mar. 31, 2013
Cash flows from operating activities
Net loss	$ (10,894)	$ (3,376)
Adjustments to reconcile net loss to net cash used in operating activities
Depreciation and amortization	3,507	3,110
Stock-based compensation	448	406
Deferred taxes		(3,048)
Changes in operating assets and liabilities:
Accounts receivable	(4,597)	3,139
Inventories	5,781	(2,253)
Other inventory supplies	(140)	1,097
Prepaid expenses and other assets	(354)	1,444
Accounts payable	1,192	(6,609)
Accrued payroll	(56)	(575)
Corporate income and franchise taxes	(92)	(124)
Advanced payments	347	(71)
Accrued and other current liabilities	385	(106)
Net cash used in operating activities	(4,473)	(6,966)
Cash flows from investing activities
Purchases of property and equipment	(1,924)	(192)
Purchases of investments	(26,675)	(9)
Proceeds from sale of investments	4,500	9,023
Net cash (used in) provided by investing activities	(24,099)	8,822
Cash flows from financing activities
Proceeds from issuance of common stock, net of issuance costs	34,961
Proceeds from exercise of options	256	2
Restricted cash	4
Net cash provided by financing activities	35,221	2
Net effect of currency translation	(39)	75
Net increase in cash and cash equivalents	6,610	1,933
Cash and cash equivalents, beginning of period	21,071	19,573
Cash and cash equivalents, end of period	$ 27,681	$ 21,506