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Summary of RSU and Performance Stock Unit Activity (Detail) - RSU and Performance Stock Units
$ in Thousands
9 Months Ended
Sep. 30, 2018
USD ($)
shares
Options Outstanding  
Restricted and performance stock units outstanding at December 31, 2017 505,235
Granted 385,461
Vested (134,590)
Forfeited/cancelled (48,390)
Restricted stock units outstanding at September 30, 2018 707,716
Vested and expected to vest at September 30, 2018 649,985 [1]
Weighted-Average Remaining Contractual Term (in years)  
Restricted stock units outstanding at September 30, 2018 3 years 11 months 8 days
Vested and expected to vest at September 30, 2018 3 years 5 months 4 days [1]
Aggregate Intrinsic Value  
Restricted stock units outstanding at September 30, 2018 | $ $ 39,250
Vested and expected to vest at September 30, 2018 | $ $ 36,048 [1]
[1] Represents the number of unvested RSUs expected to vest as of September 30, 2018 based on the unvested outstanding RSUs at September 30, 2018 adjusted for estimated forfeiture rates of 8% for awards granted to non-executive level employees and 3% for awards granted to executive level employees.