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Summary of Restricted Stock Unit and Performance Stock Unit Activity (Detail) - Restricted Stock Units and Performance Stock Units
$ in Thousands
 9 Months Ended
Sep. 30, 2017
USD ($)
shares
Options Outstanding  
Restricted stock units outstanding at December 31, 2016 353,838
Granted 279,054
Exercised (100,221)
Forfeited/cancelled (17,203)
Restricted stock units outstanding at September 30, 2017 515,468
Vested and expected to vest at September 30, 2017 488,104 [1]
Weighted-Average Remaining Contractual Term (in years)  
Restricted stock units outstanding at September 30, 2017 2 years 9 months 19 days
Vested and expected to vest at September 30, 2017 2 years 8 months [1]
Aggregate Intrinsic Value  
Restricted stock units outstanding at September 30, 2017 | $ $ 19,753
Vested and expected to vest at September 30, 2017 | $ $ 18,704 [1]
[1] Represents the number of vested restricted stock units as of September 30, 2017 plus the number of unvested restricted stock units expected to vest as of September 30, 2017 based on the unvested outstanding restricted stock units at September 30, 2017 adjusted for estimated forfeiture rates of 8% for awards granted to non-executive level employees and 3% for awards granted to executive level employees.