Income Taxes - Additional Information (Detail) - USD ($) $ in Thousands	3 Months Ended			9 Months Ended
	Sep. 30, 2020	Sep. 30, 2020	Sep. 30, 2019	Sep. 30, 2020	Sep. 30, 2019
Schedule Of Allocation Of Income Tax Expense Benefit [Line Items]
Additional current federal and state tax expense				$ 9,400
Provision for (benefit from) income taxes	$ (8,800)	$ (8,773)	$ 9,880	17,927	$ (3,177)
Increase in income tax expense benefit	18,700				$ 21,100
Intellectual Property [Member]
Schedule Of Allocation Of Income Tax Expense Benefit [Line Items]
Deferred tax assets, net of valuation allowance	$ 26,100	$ 26,100		$ 26,100