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Income Taxes - Schedule of Income Tax Expense (Detail) (USD $) In Thousands, unless otherwise specified	12 Months Ended
	Dec. 31, 2014	Dec. 31, 2013	Dec. 31, 2012
Current income tax (benefit) expense:
Domestic	$ 114us-gaap_CurrentFederalTaxExpenseBenefit	$ 358us-gaap_CurrentFederalTaxExpenseBenefit	$ (44)us-gaap_CurrentFederalTaxExpenseBenefit
Foreign	225us-gaap_CurrentForeignTaxExpenseBenefit	158us-gaap_CurrentForeignTaxExpenseBenefit
Total income tax expense	339us-gaap_CurrentIncomeTaxExpenseBenefit	516us-gaap_CurrentIncomeTaxExpenseBenefit	(44)us-gaap_CurrentIncomeTaxExpenseBenefit
Deferred income tax (benefit) expense
Domestic	(23)	210	63
Foreign	24
Total income tax expense	1us-gaap_DeferredIncomeTaxExpenseBenefit	210us-gaap_DeferredIncomeTaxExpenseBenefit	63us-gaap_DeferredIncomeTaxExpenseBenefit
Income tax (benefit) expense	$ 340us-gaap_IncomeTaxExpenseBenefit	$ 726us-gaap_IncomeTaxExpenseBenefit	$ 19us-gaap_IncomeTaxExpenseBenefit

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

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

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

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

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