Provision for Income Taxes (Detail) (USD $) In Thousands, unless otherwise specified	3 Months Ended
Mar. 31, 2015	Mar. 31, 2014
Current:
Federal	$ 0us-gaap_CurrentFederalTaxExpenseBenefit	$ 0us-gaap_CurrentFederalTaxExpenseBenefit
State	6	4
Total	6us-gaap_CurrentIncomeTaxExpenseBenefit	4us-gaap_CurrentIncomeTaxExpenseBenefit
Deferred:
Federal		2
State	0	0
Total		2us-gaap_DeferredIncomeTaxExpenseBenefit
Total:
Federal		2
State	6	4
Total	$ 6us-gaap_IncomeTaxExpenseBenefit	$ 6us-gaap_IncomeTaxExpenseBenefit

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

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