Income Taxes - Summary of Provision (Benefit) for Income Taxes (Detail) (USD $) In Thousands, unless otherwise specified	12 Months Ended
Dec. 31, 2014	Dec. 31, 2013	Dec. 31, 2012
Current:
Federal	$ 0us-gaap_CurrentFederalTaxExpenseBenefit	$ (248)us-gaap_CurrentFederalTaxExpenseBenefit	$ 0us-gaap_CurrentFederalTaxExpenseBenefit
State	21	33	29
Foreign	16us-gaap_CurrentForeignTaxExpenseBenefit	(229)us-gaap_CurrentForeignTaxExpenseBenefit	74us-gaap_CurrentForeignTaxExpenseBenefit
Total Current	37us-gaap_CurrentIncomeTaxExpenseBenefit	(444)us-gaap_CurrentIncomeTaxExpenseBenefit	103us-gaap_CurrentIncomeTaxExpenseBenefit
Deferred:
Federal	0	53	14
State	0	0	0
Foreign	87	474	494
Total Deferred	87us-gaap_DeferredIncomeTaxExpenseBenefit	527us-gaap_DeferredIncomeTaxExpenseBenefit	508us-gaap_DeferredIncomeTaxExpenseBenefit
Provision or income taxes	$ 124us-gaap_IncomeTaxExpenseBenefit	$ 83us-gaap_IncomeTaxExpenseBenefit	$ 611us-gaap_IncomeTaxExpenseBenefit

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

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