Income Taxes - Income Tax Rate Reconciliation (Detail)	12 Months Ended
Dec. 31, 2019	Dec. 31, 2018	Dec. 31, 2017
Income Tax Disclosure [Abstract]
Federal statutory rate	21.00%	21.00%	35.00%
State income taxes, net of federal benefit	(1.10%)	0.60%	0.00%
Change in valuation allowance related to current activity	227.10%	(21.30%)	(30.10%)
Change in valuation allowance related to change in tax rate	0.00%	0.00%	(291.20%)
Change in tax rate	0	0	2.912
Permanent items	(4.30%)	1.30%	1.10%
Provision to return adjustments and other	(1.40%)	(0.80%)	(7.90%)
Actual income tax rate	241.30%	0.80%	(1.90%)

Percentage of permanent items pertaining to continuing operations.

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Effective Income Tax Rate Reconciliation, Tax Cuts and Jobs Act of 2017, Change in Deferred Tax Assets Valuation Allowance, Percent

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

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Percentage of domestic federal statutory tax rate applicable to pretax income (loss).

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Percentage 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 changes in the valuation allowance for deferred tax assets.

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Percentage 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 revisions of previously reported income tax expense.

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Percentage 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 applicable to state and local income tax expense (benefit), net of federal tax expense (benefit).

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Percentage 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 operations, attributable to Tax Cuts and Jobs Act.

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