Consolidated Statements of Cash Flows (Unaudited) (USD $) In Thousands, unless otherwise specified	3 Months Ended
	Mar. 31, 2013	Mar. 31, 2012
Cash flows from operating activities
Net loss	$ (3,376)	$ (3,367)
Adjustments to reconcile net loss to net cash (used in) provided by operating activities
Depreciation and amortization	3,110	2,941
Stock-based compensation	406	494
Deferred taxes	(3,048)	(2,794)
Changes in operating assets and liabilities:
Accounts receivable	3,139	20,352
Inventories	(2,253)	(9,431)
Other inventory supplies	1,097	1,996
Prepaid expenses and other assets	1,444	2,634
Accounts payable	(6,609)	(6,731)
Accrued payroll	(575)	(900)
Corporate income and franchise taxes	(124)	(299)
Advance payments	(71)	405
Accrued and other current liabilities	(106)	(406)
Net cash (used in) provided by operating activities	(6,966)	4,894
Cash flows from investing activities
Purchases of property and equipment	(192)	(4,570)
Purchases of investments	(9)	(628)
Proceeds from sale of investments	9,023	10,800
Net cash provided by investing activities	8,822	5,602
Cash flows from financing activities
Proceeds from exercise of options	2	4
Restricted cash		43
Net cash provided by financing activities	2	47
Net effect of currency translation	75	(262)
Net increase in cash and cash equivalents	1,933	10,281
Cash and cash equivalents, beginning of period	19,573	4,290
Cash and cash equivalents, end of period	$ 21,506	$ 14,571