XML 69 R59.htm IDEA: XBRL DOCUMENT v3.20.2
Summary of Restricted Stock Unit Activity (Detail) - Restricted Stock Units and Performance Stock Units
$ in Thousands
 6 Months Ended
Jun. 30, 2020
USD ($)
shares
Options Outstanding  
Unvested at December 31, 2019 734,984
Awarded 149,755
Vested (170,778)
Forfeited/expired/cancelled (17,863)
Unvested at June 30, 2020 696,098
Vested and expected to vest at June 30, 2020 641,476 [1]
Weighted-Average Remaining Contractual Term (in years)  
Unvested at June 30, 2020 3 years 7 months 2 days
Vested and expected to vest at June 30, 2020 3 years 3 months 10 days [1]
Aggregate Intrinsic Value  
Unvested at June 30, 2020 | $ $ 86,045
Vested and expected to vest at June 30, 2020 | $ $ 79,293 [1]
[1] Represents the number of vested stock units as of June 30, 2020 plus the number of unvested stock units expected to vest as of June 30, 2020 based on the unvested outstanding stock units at June 30, 2020 adjusted for estimated forfeiture rates of 8% for awards granted to non-executive level employees and 3% for awards granted to executive level employees.