Income Taxes - (Benefit) Provision for Income Taxes (Detail) (USD $) In Thousands, unless otherwise specified	12 Months Ended
Dec. 31, 2014	Dec. 31, 2013	Dec. 31, 2012
Current:
Federal			$ (137)us-gaap_CurrentFederalTaxExpenseBenefit
State	1	1	1
Foreign	(482)us-gaap_CurrentForeignTaxExpenseBenefit	1,838us-gaap_CurrentForeignTaxExpenseBenefit	1,029us-gaap_CurrentForeignTaxExpenseBenefit
Total Current	(481)us-gaap_CurrentIncomeTaxExpenseBenefit	1,839us-gaap_CurrentIncomeTaxExpenseBenefit	893us-gaap_CurrentIncomeTaxExpenseBenefit
Deferred:
Federal	0	422	(422)
State		49	(49)
Foreign	(31)	(65)	(16)
Total Deferred	(31)us-gaap_DeferredIncomeTaxExpenseBenefit	406us-gaap_DeferredIncomeTaxExpenseBenefit	(487)us-gaap_DeferredIncomeTaxExpenseBenefit
(Benefit) provision for income taxes	$ (512)us-gaap_IncomeTaxExpenseBenefit	$ 2,245us-gaap_IncomeTaxExpenseBenefit	$ 406us-gaap_IncomeTaxExpenseBenefit

Amount of current federal tax expense (benefit) pertaining to income (loss) from continuing operations.

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Amount of deferred federal income tax expense (benefit) pertaining to income (loss) from continuing operations.

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