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Summary of Information Regarding Option Activity (Detail)
$ / shares in Units, $ in Thousands
 6 Months Ended
Jun. 30, 2016
USD ($)
$ / shares
shares
Options Outstanding  
Options outstanding at January 1, 2016 | shares 1,240,935
Granted | shares 331,203
Exercised | shares (170,919)
Forfeited/Cancelled | shares (85,480)
Options outstanding at June 30, 2016 | shares 1,315,739
Options exercisable at June 30, 2016 | shares 514,898
Vested and expected to vest at June 30, 2016 | shares 1,223,223 [1]
Weighted-Average Exercise Price Per Share  
Options outstanding at January 1, 2016 | $ / shares $ 10.44
Granted | $ / shares 12.40
Exercised | $ / shares 5.89
Forfeited/Cancelled | $ / shares 7.69
Options outstanding at June 30, 2016 | $ / shares 11.70
Options exercisable at June 30, 2016 | $ / shares 9.49
Vested and expected to vest at June 30, 2016 | $ / shares $ 11.88 [1]
Weighted-Average Remaining Contractual Term (in years)  
Options outstanding at June 30, 2016 7 years 3 months 29 days
Options exercisable at June 30, 2016 5 years 2 months 1 day
Vested and expected to vest at June 30, 2016 7 years 3 months 4 days [1]
Aggregate Intrinsic Value  
Options outstanding at June 30, 2016 | $ $ 21,147
Options exercisable at June 30, 2016 | $ 9,402
Vested and expected to vest at June 30, 2016 | $ $ 19,473 [1]
[1] This represents the number of vested options as of June 30, 2016 plus the number of unvested options expected to vest as of June 30, 2016 based on the unvested outstanding options at June 30, 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.