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Summary of Restricted Stock Unit Activity (Detail) - Restricted Stock Units (RSUs)
$ in Thousands
3 Months Ended
Mar. 31, 2017
USD ($)
shares
Options Outstanding  
Restricted stock units outstanding at December 31, 2016 353,838
Granted 125,067
Exercised (63,811)
Forfeited/cancelled (10,313)
Restricted stock units outstanding at March 31, 2017 404,781
Vested and expected to vest at March 31, 2017 378,579 [1]
Weighted-Average Remaining Contractual Term (in years)  
Restricted stock units outstanding at March 31, 2017 3 years 1 month 13 days
Vested and expected to vest at March 31, 2017 3 years 4 days [1]
Aggregate Intrinsic Value  
Restricted stock units outstanding at March 31, 2017 | $ $ 14,248
Vested and expected to vest at March 31, 2017 | $ $ 13,326 [1]
[1] Represents the number of vested restricted stock units as of March 31, 2017 plus the number of unvested restricted stock units expected to vest as of March 31, 2017 based on the unvested outstanding restricted stock units at March 31, 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.