Income Tax Benefit Attributable to Loss Before Income Taxes Deferred (Detail) (USD $)	12 Months Ended
Dec. 31, 2014	Dec. 31, 2013
Current:
Federal	$ 0us-gaap_CurrentFederalTaxExpenseBenefit	$ 0us-gaap_CurrentFederalTaxExpenseBenefit
State	0	0
Total	0us-gaap_CurrentIncomeTaxExpenseBenefit	0us-gaap_CurrentIncomeTaxExpenseBenefit
Deferred:
Federal	0	0
State	0	0
Total	0us-gaap_DeferredIncomeTaxExpenseBenefit	0us-gaap_DeferredIncomeTaxExpenseBenefit
Provision for income tax, net	$ 0us-gaap_IncomeTaxExpenseBenefit	$ 0us-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 current state and local tax expense (benefit) pertaining to income (loss) from continuing operations.

Amount of deferred federal 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.

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