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Income Taxes - Components of Income Tax Expenses (Detail) (USD $)
In Thousands, unless otherwise specified
3 Months Ended 9 Months Ended
Sep. 30, 2014
Sep. 30, 2013
Sep. 30, 2014
Sep. 30, 2013
Current year provision:        
Federal $ 0 $ 0 $ 0 $ 60
State 24 (281) 24 (281)
Deferred tax expense 1,534 532 2,372 1,320
Valuation allowance on deferred taxes (1,534) (532) (2,372) (1,320)
Net income tax expense $ 24 $ (281) $ 24 $ (221)