Annual report pursuant to Section 13 and 15(d)

Income Tax - Reconciliation of Statutory Federal Income Tax Rate to Provision for Income Tax (Detail)

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Income Tax - Reconciliation of Statutory Federal Income Tax Rate to Provision for Income Tax (Detail) - USD ($)
$ in Thousands
12 Months Ended
Dec. 31, 2018
Dec. 31, 2017
Effective Income Tax Rate Reconciliation, Amount [Abstract]    
Statutory federal income tax rate (statutory tax rate) $ (151) $ 1,321
Effect of state taxes, net of federal 2,284 (1,207)
Permanent items 318 458
State rate change 248 (179)
Valuation allowance (147) 1,667
Tax Cuts and Jobs Act of 2017   (23,000)
Other, net (79) 70
Provision for (benefit from) income taxes $ 2,473 $ (20,870)