Income Taxes - Additional Information (Detail) $ in Millions	9 Months Ended
Sep. 30, 2018 USD ($)
Tax Credit Carryforward [Line Items]
Deferred tax assets, net	$ 18.1
Unrecognized tax benefits recognized during period	3.6
Unrecognized tax benefits	3.8
Increase in unrecognized tax benefits in next twelve months	0.2
Research and development tax credit studies	$ 2.2
Overall effective tax rate, after discrete period adjustments	(8.10%)
Effective tax rate, before discrete period adjustment	24.00%
State
Tax Credit Carryforward [Line Items]
Unrecognized tax benefits recognized during period	$ 0.2
Expiring in 2019
Tax Credit Carryforward [Line Items]
Tax credit carryforward, amount	1.2
Research and Development Credits
Tax Credit Carryforward [Line Items]
Tax credit carryforward, amount	17.0
Restricted Stock Units (RSUs)
Tax Credit Carryforward [Line Items]
Discrete tax benefit, stock-based compensation	8.1
Stock Options
Tax Credit Carryforward [Line Items]
Discrete tax benefit, stock-based compensation	$ 3.4

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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