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Summary of Information Regarding Option Activity (Detail)
$ / shares in Units, $ in Thousands
 3 Months Ended
Mar. 31, 2016
USD ($)
$ / shares
shares
Options Outstanding  
Options outstanding at January 1, 2016 | shares 1,240,935
Granted | shares 244,220
Exercised | shares (113,747)
Forfeited/cancelled | shares (58,900)
Options outstanding at March 31, 2016 | shares 1,312,508
Options exercisable at March 31, 2016 | shares 517,769
Vested and expected to vest at March 31, 2016 | shares 1,221,408 [1]
Weighted-Average Exercise Price Per Share  
Options outstanding at January 1, 2016 | $ / shares $ 10.44
Granted | $ / shares 13.44
Exercised | $ / shares 6.86
Forfeited/Cancelled | $ / shares 6.15
Options outstanding at March 31, 2016 | $ / shares 11.50
Options exercisable at March 31, 2016 | $ / shares 7.91
Vested and expected to vest at March 31, 2016 | $ / shares $ 11.61 [1]
Weighted-Average Remaining Contractual Term (in years)  
Options outstanding at December 31, 2015 7 years 4 months 2 days
Options exercisable at December 31, 2015 5 years 1 month 10 days
Vested and expected to vest at December 31, 2015 7 years 3 months 4 days [1]
Aggregate Intrinsic Value  
Options outstanding at December 31, 2015 | $ $ 20,679
Options exercisable at December 31, 2015 | $ 9,792
Vested and expected to vest at December 31, 2015 | $ $ 19,133 [1]
[1] This represents the number of vested options as of March 31, 2016 plus the number of unvested options expected to vest as of March 31, 2016 based on the unvested outstanding options at March 31, 2016 adjusted for estimated forfeiture rates of 8% for awards granted to non-executive level employees and 3% for awards granted to executive level employees.