- Effective Income Tax Rate Reconciliation (Details) (USD $) In Thousands, unless otherwise specified	12 Months Ended
Dec. 31, 2014	Dec. 31, 2013	Dec. 31, 2012
Difference the amount of tax expense provided and the amount of tax expense computed by applying the statutory federal income tax rate to income before income taxes
Expected tax expense at the statutory federal rate of 35%	$ (6,574)	$ (7,995)	$ (2,160)
Statutory federal rate	35.00%	35.00%	35.00%
(Increase) decrease in taxes resulting from:
Change in valuation allowance	(770)	(726)	(2,422)
State income taxes, net	(559)	(810)	(588)
Foreign tax rate differences	659	828	374
Non-deductible expenses	(206)	(351)	(316)
Stock-based compensation and other	21	238	(253)
Total income tax expense	$ (7,429)us-gaap_IncomeTaxExpenseBenefit	$ (8,816)us-gaap_IncomeTaxExpenseBenefit	$ (5,365)us-gaap_IncomeTaxExpenseBenefit

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Percentage of current income tax expense (benefit) and deferred income tax expense (benefit) pertaining to continuing operations.

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The amount of income tax expense or benefit for the period computed by applying the domestic federal statutory tax rates to pretax income from continuing operations.

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Amount of the difference between reported income tax expense (benefit) and expected income tax expense (benefit) computed by applying the domestic federal statutory income tax rates to pretax income (loss) from continuing operations attributable to tax exempt income, equity in earnings (loss) of an unconsolidated subsidiary, minority noncontrolling interest income (loss), tax holiday, disposition of a business, disposition of an asset, repatriation of foreign earnings, repatriation of foreign earnings jobs creation act of 2004, increase (decrease) in enacted tax rate, prior year income taxes, increase (decrease) in deferred tax asset valuation allowance, and other adjustments.

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