Consolidated statements of cash flows (USD $) In Thousands, unless otherwise specified	6 Months Ended
	Jun. 30, 2013	Jun. 30, 2012
Cash flows from operating activities
Net loss	$ (9,270)	$ (4,679)
Adjustments to reconcile net loss to net cash provided by operating activities
Depreciation and amortization	6,222	5,893
Net loss (gain) on disposal of assets	427	(5)
Stock-based compensation	748	988
Deferred taxes	(7,328)	(4,903)
Changes in operating assets and liabilities:
Accounts receivable	9,566	23,328
Inventories	3,356	(15,978)
Other inventory supplies	2,430	2,077
Prepaid expenses and other assets	2,081	2,280
Accounts payable	(6,085)	(5,835)
Accrued payroll	(577)	(358)
Corporate income and franchise taxes	(103)	(285)
Advanced payments	(570)	939
Accrued and other current liabilities	(528)	(311)
Net cash provided by operating activities	369	3,151
Cash flows from investing activities
Purchases of property and equipment	(3,139)	(6,371)
Proceeds from disposal of assets		10
Purchases of investments	(2,019)
Proceeds from sale of investments	7,632	20,642
Net cash provided by investing activities	2,474	14,281
Cash flows from financing activities
Proceeds from exercise of options	27	4
Restricted cash	5	23
Net cash provided by financing activities	32	27
Net effect of currency translation	331	25
Net increase in cash and cash equivalents	3,206	17,484
Cash and cash equivalents, beginning of period	19,573	4,290
Cash and cash equivalents, end of period	$ 22,779	$ 21,774