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Stock-Based Compensation - Narrative (Detail) (USD $)
In Millions, except Share data, unless otherwise specified
 3 Months Ended 9 Months Ended 1 Months Ended 9 Months Ended 1 Months Ended
Sep. 30, 2014
Sep. 30, 2013
Sep. 30, 2014
Sep. 30, 2013
Sep. 30, 2014
Equity Incentive Plan 2008
Jan. 31, 2014
Equity Incentive Plan 2008
Stock Option
Sep. 30, 2014
Equity Incentive Plan 2008
Maximum
Oct. 31, 2014
Subsequent Event
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]                
Stock options, maximum term 6 years 0 months 25 days 5 years 9 months 17 days 5 years 11 months 8 days 5 years 9 months 17 days     10 years  
Stock options, average vesting period         4 years      
Increase in authorized shares           1,517,975    
Stock options, number of shares reserved for issuance         8,741,276      
Share-based Compensation Arrangement by Share-based Payment Award, Number of Shares Available for Grant         1,961,278      
Unvested options outstanding 2,024,005   2,024,005          
Unvested options outstanding, vesting period     2 years 0 months 18 days          
Unrecognized compensation expense $ 11.1   $ 11.1          
Granted in period (shares)     184,250         1,200,000
Granted in period (USD per share)     $ 12.00         $ 11.58