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Summary of Significant Accounting Policies - Difference Between Federal Statutory Rate and Effective Tax Rate (Detail)	3 Months Ended		9 Months Ended
	Sep. 30, 2020	Sep. 30, 2019	Sep. 30, 2020	Sep. 30, 2019
Accounting Policies [Abstract]
Tax at statutory rate	21.00%	21.00%	21.00%	21.00%
Tax effect of:
Valuation allowance on deferred tax assets	1.50%	4.50%	1.00%	2.30%
State income taxes, net of federal benefit	5.20%	(1.80%)	4.30%	0.00%
Nondeductible stock-based compensation	(1.00%)	1.20%	(0.80%)	1.50%
Transaction costs	0.00%	8.60%	0.00%	1.90%
Other	0.00%	2.70%	0.10%	0.00%
Effective tax rate	26.70%	36.20%	25.60%	26.70%

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Effective Income Tax Rate Reconciliation, Transaction Costs, 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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-Publisher FASB
-Name Accounting Standards Codification
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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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