Provision (Benefit) for Income Taxes (Detail) (USD $) In Thousands, unless otherwise specified	12 Months Ended
Dec. 31, 2014	Dec. 31, 2013
Current:
Foreign	$ 0us-gaap_CurrentForeignTaxExpenseBenefit	$ 0us-gaap_CurrentForeignTaxExpenseBenefit
Federal	0us-gaap_CurrentFederalTaxExpenseBenefit	0us-gaap_CurrentFederalTaxExpenseBenefit
State	9	5
Total	9us-gaap_CurrentIncomeTaxExpenseBenefit	5us-gaap_CurrentIncomeTaxExpenseBenefit
Deferred:
Foreign	0	0
Federal		(5)
State		(1)
Total		(6)us-gaap_DeferredIncomeTaxExpenseBenefit
Total:
Foreign	0	0
Federal		(5)
State	9	4
Total	$ 9us-gaap_IncomeTaxExpenseBenefit	$ (1)us-gaap_IncomeTaxExpenseBenefit

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

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