Income Taxes - Additional Information (Detail) $ in Millions	6 Months Ended
Jun. 30, 2017 USD ($)
Tax Credit Carryforward [Line Items]
Deferred tax assets, net	$ 20.3
Research and development tax credit studies	15.6
Unrecognized tax benefits	$ 4.4
Overall effective tax rate, after discrete period adjustments	15.00%
Effective tax rate, before discrete period adjustment	42.20%
Discrete tax benefit, stock-based compensation	$ 1.4
Federal
Tax Credit Carryforward [Line Items]
Unrecognized tax benefits	4.3
State
Tax Credit Carryforward [Line Items]
Unrecognized tax benefits	0.1
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, valuation allowance	$ 1.6

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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Percentage of current income tax expense (benefit) and deferred income tax expense (benefit) pertaining to continuing operations.

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Percentage of the difference between reported income tax expense (benefit) and expected income tax expense (benefit) computed by applying the domestic federal statutory income tax rates to pretax income (loss) from continuing operations attributable to income tax contingencies. Includes, but not limited to, domestic tax contingency, foreign tax contingency, state and local tax contingency, and other contingencies.

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Amount of the difference between reported income tax expense (benefit) and expected income tax expense (benefit) computed by applying the domestic federal statutory income tax rates to pretax income (loss) from continuing operations attributable to research tax credit.

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The amount of the tax credit carryforward, before tax effects, available to reduce future taxable income under enacted tax laws.

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

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The total amount of unrecognized tax benefits that, if recognized, would affect the effective tax rate.

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