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Summary of Restricted Stock Unit Activity (Detail) - Restricted Stock Units (RSUs)
$ in Thousands
 6 Months Ended
Jun. 30, 2017
USD ($)
shares
Options Outstanding  
Restricted stock units outstanding at December 31, 2016 353,838
Granted 146,154
Exercised (94,261)
Forfeited/cancelled (12,393)
Restricted stock units outstanding at June 30, 2017 393,338
Vested and expected to vest at June 30, 2017 362,788 [1]
Weighted-Average Remaining Contractual Term (in years)  
Restricted stock units outstanding at June 30, 2017 2 years 11 months 4 days
Vested and expected to vest at June 30, 2017 2 years 9 months 25 days [1]
Aggregate Intrinsic Value  
Restricted stock units outstanding at June 30, 2017 | $ $ 16,300
Vested and expected to vest at June 30, 2017 | $ $ 15,034 [1]
[1] Represents the number of vested restricted stock units as of June 30, 2017 plus the number of unvested restricted stock units expected to vest as of June 30, 2017 based on the unvested outstanding restricted stock units at June 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.