Income Taxes - Additional Information (Detail) $ in Millions	9 Months Ended
Sep. 30, 2019 USD ($)
Tax Credit Carryforward [Line Items]
Deferred tax assets, net	$ 23.3
Unrecognized tax benefits	6.2
Research and development tax credit studies	$ 2.9
Overall effective tax rate, after discrete period adjustments (as a percentage)	5.10%
Effective tax rate, before discrete period adjustment (as a percentage)	19.60%
Write off of certain deferred tax assets	$ 1.7
Restricted Stock Units (RSUs)
Tax Credit Carryforward [Line Items]
Discrete tax benefit, stock-based compensation	3.9
State Tax
Tax Credit Carryforward [Line Items]
Unrecognized tax benefits recognized during period	6.1
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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