Income Taxes - Additional Information (Detail) (USD $)	3 Months Ended
Mar. 31, 2015	Mar. 31, 2014
Income Tax Disclosure [Line Items]
Deferred tax assets, net	$ 16,700,000us-gaap_DeferredTaxAssetsNet
Research and development tax credit studies	10,500,000
Unrecognized tax benefits	3,400,000
Deferred Tax Assets, Valuation Allowance	500,000
Cash paid for income taxes—net	209,000us-gaap_IncomeTaxesPaidNet	50,000us-gaap_IncomeTaxesPaidNet
Overall effective tax rate, after discrete period adjustments	32.60%
Effective tax rate, before discrete period adjustment	32.90%
Research and Development Credits
Income Tax Disclosure [Line Items]
Tax credit carryforward, valuation allowance	1,700,000
Expiring in 2019
Income Tax Disclosure [Line Items]
Tax Credit Carryforward, Amount	1,200,000
State
Income Tax Disclosure [Line Items]
Unrecognized tax benefits	200,000
Federal
Income Tax Disclosure [Line Items]
Unrecognized tax benefits	$ 3,200,000

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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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Amount of deferred tax assets for which it is more likely than not that a tax benefit will not be realized.

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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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The amount of cash paid during the current period to foreign, federal, state, and local authorities as taxes on income, net of any cash received during the current period as refunds for the overpayment of taxes.

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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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