Income Taxes - Additional Information (Detail) - Jun. 30, 2015 - USD ($) $ in Millions	Total
Income Tax Disclosure [Line Items]
Deferred tax assets, net	$ 15.6
Research and development tax credit studies	10.5
Unrecognized tax benefits	3.0
Deferred Tax Assets, Valuation Allowance	$ 0.4
Overall effective tax rate, after discrete period adjustments	34.00%
Effective tax rate, before discrete period adjustment	36.60%
Research and Development Credits
Income Tax Disclosure [Line Items]
Tax credit carryforward, valuation allowance	$ 1.2
Expiring in 2019
Income Tax Disclosure [Line Items]
Tax Credit Carryforward, Amount	1.2
State
Income Tax Disclosure [Line Items]
Unrecognized tax benefits	0.2
Federal
Income Tax Disclosure [Line Items]
Unrecognized tax benefits	$ 2.8