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Summary of Restricted Stock Unit Activity (Detail) - Restricted Stock Units (RSUs)
$ in Thousands
12 Months Ended
Dec. 31, 2018
USD ($)
shares
Options Outstanding  
Unvested at December 31, 2017 505,235
Awarded 407,961
Vested (153,383)
Forfeited/expired/cancelled (54,400)
Unvested at December 31, 2018 705,413
Vested and expected to vest at December 31, 2018 652,543 [1]
Weighted-Average Remaining Contractual Term (in years)  
Unvested at December 31, 2018 3 years 11 months 23 days
Vested and expected to vest at December 31, 2018 3 years 3 months 3 days [1]
Aggregate Intrinsic Value  
Unvested at December 31, 2018 | $ $ 37,203
Vested and expected to vest at December 31, 2018 | $ $ 34,415 [1]
[1] Represents the number of vested RSUs units as of December 31, 2018 plus the number of unvested RSUs expected to vest as of December 31, 2018 based on the unvested outstanding RSUs at December 31, 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.