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Employee Benefit Plan - Additional Information (Detail) (USD $) | 12 Months Ended
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Dec. 31, 2014
Compensation and Retirement Disclosure [Abstract] |
Company matched employee's contribution | 25.00%us-gaap_DefinedContributionPlanEmployerMatchingContributionPercent
Employee's contribution | $ 2,000 us-gaap_DefinedContributionPlanMaximumAnnualContributionsPerEmployeeAmount

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- Details
Name: | us-gaap_CompensationAndRetirementDisclosureAbstract
Namespace Prefix: | us-gaap_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration

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- Definition Percentage of employees' gross pay for which the employer contributes a matching contribution to a defined contribution plan. + References No definition available. + Details
Name: | us-gaap_DefinedContributionPlanEmployerMatchingContributionPercent
Namespace Prefix: | us-gaap_
Data Type: | num:percentItemType
Balance Type: | na
Period Type: | duration

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- Definition Maximum amount the employee may contribute to a defined contribution plan. + References No definition available. + Details
Name: | us-gaap_DefinedContributionPlanMaximumAnnualContributionsPerEmployeeAmount
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration