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

Income tax reconciliation federal net operating loss adjustments.

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Income tax reconciliation federal return to provision.

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Income tax reconciliation other tax credit charges.

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Income tax reconciliation tax credit charges research and development.

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Income tax reconciliation uncertain tax position.

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Amount of current income tax expense (benefit) and deferred income tax expense (benefit) pertaining to continuing operations.

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Amount of the difference between reported income tax expense (benefit) and expected income tax expense (benefit) computed by applying the domestic federal statutory income tax rates to pretax income (loss) from continuing operations attributable to increase (decrease) in the valuation allowance for deferred tax assets.

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Amount of the difference between reported income tax expense (benefit) and expected income tax expense (benefit) computed by applying the domestic federal statutory income tax rates to pretax income (loss) from continuing operations, attributable to increase (decrease) in the income tax rates.

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The amount of income tax expense or benefit for the period computed by applying the domestic federal statutory tax rates to pretax income from continuing operations.

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Amount of reported income tax expense (benefit) in excess of (less than) expected income tax expense (benefit) computed by applying domestic federal statutory income tax rate to pretax income (loss) from continuing operation, attributable to nondeductible expense for award under share-based payment arrangement. Includes, but is not limited to, expense determined to be nondeductible upon grant or after for award under share-based payment arrangement.

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