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Summary of Significant Accounting Policies - Consolidated Income Tax Provision (Benefit) (Detail) - USD ($)
$ in Thousands
3 Months Ended 6 Months Ended
Jun. 30, 2018
Jun. 30, 2017
Jun. 30, 2018
Jun. 30, 2017
Income Tax Disclosure [Abstract]        
Current - State $ 24 $ 21 $ 34 $ 97
Deferred - State (597) 496 (1,051) 855
Deferred - Federal 451   1,477  
Total $ (122) $ 517 $ 460 $ 952