Income Taxes - Reconciliation (Details) (USD $) In Thousands, unless otherwise specified	12 Months Ended
Dec. 31, 2014	Dec. 31, 2013	Dec. 31, 2012
Income Tax Disclosure [Abstract]
Taxes at federal statutory rate	$ (655)	$ 2,888	$ 3,054
State taxes, net of federal benefit	(90)	(29)	(23)
Effect of tax rate differential for foreign subsidiary	(3,570)	(2,531)	(2,695)
Valuation allowance, including tax benefits of stock activity	4,698	(239)	(8,034)
Foreign taxes on unremitted earnings	1,590	0	0
Stock-based compensation	621	460	242
Prior year true-up Subpart F income	0	0	2,484
Return to provision adjustments	536	(920)	3,568
Subpart F income inclusion	1,167	2,446	3,110
Other	49	77	643
Tax provision	$ 4,346us-gaap_IncomeTaxExpenseBenefit	$ 2,152us-gaap_IncomeTaxExpenseBenefit	$ 2,349us-gaap_IncomeTaxExpenseBenefit

Income Tax Reconciliation, Change in Deferred Tax Assets Valuation Allowance, Including Stock Activity

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- Definition

Income Tax Reconciliation, Prior year true-up Subpart F Income Inclusion

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Income Tax Reconciliation, Return to Provision Adjustments

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Income Tax Reconciliation, Subpart F Income Inclusion

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

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 235

-SubTopic 10

-Section S99

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-Subparagraph (SX 210.4-08.(h))

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-Name Regulation S-X (SX)

-Number 210

-Section 08

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-Article 4

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-Publisher FASB

-Name Accounting Standards Codification

-Glossary Income Tax Expense (or Benefit)

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-Publisher FASB

-Name Accounting Standards Codification

-Topic 740

-SubTopic 10

-Section 50

-Paragraph 9

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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 foreign income tax expense (benefit).

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Reference 1: http://www.xbrl.org/2003/role/presentationRef

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-Section 50

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-Name Accounting Standards Codification

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-Name Regulation S-X (SX)

-Number 210

-Section 08

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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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