Income Taxes (Detail) $ in Millions	3 Months Ended
Mar. 31, 2020 USD ($)
Tax Credit Carryforward [Line Items]
Deferred tax assets, net	$ 29.1
Unrecognized tax benefits	6.6
Research and development tax credit studies	$ 2.6
Overall effective tax rate, after discrete period adjustments (as a percentage)	(2789.40%)
Effective tax rate, before discrete period adjustment (as a percentage)	90.00%
Restricted Stock Units (RSUs)
Tax Credit Carryforward [Line Items]
Discrete tax benefit, stock-based compensation	$ 4.1
State Tax
Tax Credit Carryforward [Line Items]
Unrecognized tax benefits recognized during period	6.5
Federal Income Tax
Tax Credit Carryforward [Line Items]
Unrecognized tax benefits recognized during period	$ 0.1

Effective Income Tax Rate Reconciliation, Deduction, Stock-based Compensation

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

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