Income Taxes - Additional Information (Detail) $ in Millions	3 Months Ended
Mar. 31, 2019 USD ($)
Tax Credit Carryforward [Line Items]
Deferred tax assets, net	$ 18.8
Unrecognized tax benefits	5.7
Research and development tax credit studies	$ 2.7
Overall effective tax rate, after discrete period adjustments (as a percentage)	(28.80%)
Effective tax rate, before discrete period adjustment (as a percentage)	21.10%
Write off of certain deferred tax assets	$ 0.0
Restricted Stock Units (RSUs)
Tax Credit Carryforward [Line Items]
Discrete tax benefit, stock-based compensation	2.7
State Tax
Tax Credit Carryforward [Line Items]
Unrecognized tax benefits recognized during period	5.7
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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