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Retirement Plan - Additional Information (Detail) (USD $)
 12 Months Ended
Dec. 31, 2014
Dec. 31, 2013
Dec. 31, 2012
Disclosure of Compensation Related Costs, Share-based Payments [Abstract]      
Employee's contribution to retirement plan 4.00%us-gaap_DefinedContributionPlanMaximumAnnualContributionsPerEmployeePercent    
Percentage of employees contribution 50.00%us-gaap_DefinedContributionPlanEmployerMatchingContributionPercent    
Percentage of company match 2.00%us-gaap_DefinedContributionPlanEmployersMatchingContributionAnnualVestingPercentage    
Employers contribution $ 358,000us-gaap_DefinedContributionPlanEmployerDiscretionaryContributionAmount $ 275,000us-gaap_DefinedContributionPlanEmployerDiscretionaryContributionAmount $ 220,000us-gaap_DefinedContributionPlanEmployerDiscretionaryContributionAmount