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, 2019
Dec. 31, 2018
Income Tax Disclosure [Abstract]    
Expected federal income tax benefit at statutory rate of 21% in 2019 and 2018 $ (3,748) $ (7,506)
Effect of permanent other differences 6 18
Return to provision adjustments 79 (2,241)
State income tax benefit, net of federal benefit tax assets (268) (536)
Valuation allowance 3,976 8,321
Total income tax expense (benefit) $ 45 $ (1,944)