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Summary of Information Regarding Option Activity (Detail) - Jun. 30, 2015 - USD ($)
Total
Options Outstanding  
Options outstanding at January 1, 2015 1,225,117
Granted 224,182
Exercised (128,613)
Forfeited/Cancelled (55,200)
Options outstanding at June 30, 2015 1,265,486
Options exercisable at June 30, 2015 466,706
Vested and expected to vest at June 30, 2015 [1] 1,184,234
Weighted-Average Exercise Price Per Share  
Options outstanding at January 1, 2015 $ 8.31
Granted 14.31
Exercised 5.03
Forfeited/Cancelled 8.96
Options outstanding at June 30, 2015 9.68
Options exercisable at June 30, 2015 6.21
Vested and expected to vest at June 30, 2015 [1] $ 9.68
Weighted-Average Remaining Contractual Term (in years)  
Options outstanding at June 30, 2015 7 years 2 months 23 days
Options exercisable at June 30, 2015 5 years 4 days
Vested and expected to vest at June 30, 2015 [1] 7 years 2 months 9 days
Aggregate Intrinsic Value  
Options outstanding at June 30, 2015 $ 39,977,638
Options exercisable at June 30, 2015 16,360,523
Vested and expected to vest at June 30, 2015 [1] $ 37,410,229
[1] Represents the number of vested options as of June 30, 2015 plus the number of unvested options expected to vest as of June 30, 2015 based on the unvested outstanding options at June 30, 2015 adjusted for estimated forfeiture rates of 8% for awards granted to non-executive level employees and 3% for awards granted to executive level employees.