Annual report pursuant to Section 13 and 15(d)

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

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Income Taxes - Schedule of Reconciliation of Income Tax Provision to Statutory Federal Income Tax Rate (Detail) - USD ($)
$ in Thousands
12 Months Ended
Dec. 31, 2019
Dec. 31, 2018
Dec. 31, 2017
Income Tax Expense Benefit Continuing Operations Income Tax Reconciliation [Abstract]      
Income taxes at statutory rates $ 229 $ (521) $ 397
State income tax, net of federal benefit 8 10 4
Permanent items (11) 18 (5)
Meals and entertainment 50 47 75
Equity based compensation (8) (99) (646)
Corporate tax rate change - impact on deferred income taxes     2,768
Research and development credit (94) (195) 207
Federal NOL adjustment     (386)
Federal return to provision 101 (168) 53
Other federal credits     112
Other 145 64 16
Change in federal valuation allowance (257) 945 (2,569)
Total tax provision $ 163 $ 101 $ 26