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Income Taxes - Additional Information (Detail) - USD ($)	Dec. 31, 2019	Dec. 31, 2018	Mar. 31, 2017
Income Tax Contingency [Line Items]
Valuation allowance	$ 2,900,000	$ 2,900,000
Unrecognized tax benefits	0	$ 0
Federal
Income Tax Contingency [Line Items]
Net operating loss	800,500,000
State
Income Tax Contingency [Line Items]
Net operating loss	$ 642,000,000.0
ASU 2016-09
Income Tax Contingency [Line Items]
Stock-based compensation related to unrealized excess tax benefits			$ 10,600,000

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Represents the expense recognized during the period arising from stock-based equity awards granted to employees and directors that has not yet been realized for excess tax benefits.

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Amount of operating loss carryforward, before tax effects, available to reduce future taxable income under enacted tax laws.

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The portion of the valuation allowance pertaining to the deferred tax asset representing potential future taxable deductions from net operating loss carryforwards for which it is more likely than not that a tax benefit will not be realized.

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