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Summary of Information Regarding Option Activity (Detail)
$ / shares in Units, $ in Thousands
 9 Months Ended
Sep. 30, 2015
USD ($)
$ / shares
shares
Options Outstanding  
Options outstanding at January 1, 2015 1,225,117
Granted 270,532
Exercised (171,893)
Forfeited/Cancelled (71,400)
Options outstanding at September 30, 2015 1,252,356
Options exercisable at September 30, 2015 504,326
Vested and expected to vest at September 30, 2015 1,186,665 [1]
Weighted-Average Exercise Price Per Share  
Options outstanding at January 1, 2015 | $ / shares $ 8.31
Granted | $ / shares 16.57
Exercised | $ / shares 5.24
Forfeited/Cancelled | $ / shares 9.12
Options outstanding at September 30, 2015 | $ / shares 10.47
Options exercisable at September 30, 2015 | $ / shares 6.33
Vested and expected to vest at September 30, 2015 | $ / shares $ 10.47 [1]
Weighted-Average Remaining Contractual Term (in years)  
Options outstanding at September 30, 2015 7 years 29 days
Options exercisable at September 30, 2015 4 years 10 months 13 days
Vested and expected to vest at September 30, 2015 7 years 15 days [1]
Aggregate Intrinsic Value  
Options outstanding at September 30, 2015 | $ $ 22,287
Options exercisable at September 30, 2015 | $ 10,853
Vested and expected to vest at September 30, 2015 | $ $ 21,146 [1]
[1] Represents the number of vested options as of September 30, 2015 plus the number of unvested options expected to vest as of September 30, 2015 based on the unvested outstanding options at September 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.