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Employee Benefit Plans - Additional Information (Details) (USD $)
In Thousands, unless otherwise specified
12 Months Ended
Dec. 31, 2014
Dec. 31, 2013
Dec. 31, 2012
Compensation And Retirement Disclosure [Abstract]      
Employee contribution to benefit plan 15.00%us-gaap_DefinedContributionPlanMaximumAnnualContributionsPerEmployeePercent    
Employer contribution towards compensation 100.00%us-gaap_DefinedContributionPlanEmployerMatchingContributionPercentOfMatch    
Compensation contributed percentage 4.00%us-gaap_DefinedContributionPlanEmployerMatchingContributionPercent    
Compensation expenses $ 925us-gaap_DefinedContributionPlanCostRecognized $ 482us-gaap_DefinedContributionPlanCostRecognized $ 175us-gaap_DefinedContributionPlanCostRecognized