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Income Taxes - Income Tax Provision (Detail) (USD $)	12 Months Ended
Income Taxes - Income Tax Provision (Detail) (USD $)	Dec. 31, 2014	Dec. 31, 2013	Dec. 31, 2012	Dec. 31, 2011
Federal income taxes:
Current	$ 37,000us-gaap_CurrentFederalTaxExpenseBenefit	$ 356,000us-gaap_CurrentFederalTaxExpenseBenefit
Deferred	6,000	(113,000)
State income taxes:
Current	26,000	43,000
Deferred	1,000	(13,000)
Income tax provision	$ 70,000us-gaap_IncomeTaxExpenseBenefit	$ 273,000us-gaap_IncomeTaxExpenseBenefit	$ 0us-gaap_IncomeTaxExpenseBenefit	$ 0us-gaap_IncomeTaxExpenseBenefit

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