Income Taxes - Provision for Income Taxes (Detail) $ in Thousands	9 Months Ended
Sep. 30, 2020 USD ($)
Deferred:
Federal	$ 69
Total deferred	69
Total income tax expense	$ 69

Amount of deferred income tax expense (benefit) pertaining to income (loss) from continuing operations.

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Name:	us-gaap_DeferredIncomeTaxExpenseBenefit
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	duration