Income Taxes - Summary of Income Tax Expense (Detail) (USD $) In Thousands, unless otherwise specified	12 Months Ended
Dec. 31, 2014	Dec. 31, 2013	Dec. 31, 2012
Current:
Federal			$ 50us-gaap_CurrentFederalTaxExpenseBenefit
State	5	(19)	(440)
Foreign	44us-gaap_CurrentForeignTaxExpenseBenefit	172us-gaap_CurrentForeignTaxExpenseBenefit	156us-gaap_CurrentForeignTaxExpenseBenefit
Total current	49us-gaap_CurrentIncomeTaxExpenseBenefit	153us-gaap_CurrentIncomeTaxExpenseBenefit	(234)us-gaap_CurrentIncomeTaxExpenseBenefit
Deferred:
Federal	0	0	0
State	0	0	0
Foreign	0	0	0
Total deferred	0us-gaap_DeferredIncomeTaxExpenseBenefit	0us-gaap_DeferredIncomeTaxExpenseBenefit	0us-gaap_DeferredIncomeTaxExpenseBenefit
Total provision	$ 49us-gaap_IncomeTaxExpenseBenefit	$ 153us-gaap_IncomeTaxExpenseBenefit	$ (234)us-gaap_IncomeTaxExpenseBenefit

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

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