Income Taxes - Additional Information (Detail) - USD ($) $ in Thousands	3 Months Ended	9 Months Ended
Sep. 30, 2020	Sep. 30, 2019	Sep. 30, 2020	Sep. 30, 2019
Valuation allowance	$ 934,000		$ 934,000
Income Tax Expense (Benefit)	1,205	$ 135	1,577	$ (167)
Deferred tax asset net of valuation allowance	3,000		3,000
Changes in valuation allowance	$ 784,000		$ 934,000

Amount after allocation of valuation allowances of deferred tax asset attributable to deductible temporary differences and carryforwards.

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Amount of deferred tax assets for which it is more likely than not that a tax benefit will not be realized.

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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 increase (decrease) in the valuation allowance for a specified deferred tax asset.

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