Annual report pursuant to Section 13 and 15(d)

Income Taxes - Variations from Federal Statutory Rate (Detail)

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Income Taxes - Variations from Federal Statutory Rate (Detail) - USD ($)
$ in Thousands
12 Months Ended
Dec. 31, 2018
Dec. 31, 2017
Income Tax Disclosure [Abstract]    
Expected federal income tax benefit at statutory rate of 21% in 2018 and 34% in 2017 $ (7,506) $ (8,373)
Effect of permanent other differences 18 184
Return to provision adjustments (2,241) (1,144)
Effect of federal rate change at year-end   2,870
State income tax benefit, net of federal benefit tax assets (536) (369)
Valuation allowance 8,321 5,907
Total income tax benefit $ (1,944) $ (925)