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Stock-Based Compensation (Tables)
9 Months Ended
Sep. 30, 2021
Share-based Payment Arrangement [Abstract]  
Schedule of Stock-based Compensation Expense
Stock-based compensation expense was recorded in the following cost and expense categories consistent with the respective employee or service provider’s related cash compensation (in thousands):
Three months ended September 30,Nine months ended September 30,
2021202020212020
Cost of revenue
Subscription and support
$731 $426 $1,824 $1,293 
Professional services
407 272 1,183 1,062 
Operating expenses
Research and development
2,347 2,167 7,195 5,790 
Sales and marketing
4,095 2,687 10,481 8,367 
General and administrative
5,107 5,049 14,679 18,919 
Total
$12,687 $10,601 $35,362 $35,431 
Schedule of Stock-Option Activity
The following table summarizes the option activity under the Plans for the nine months ended September 30, 2021:




Options

Weighted-
Average
Exercise
Price
Weighted-
Average
Remaining
Contractual
Term (Years)
Outstanding at December 31, 20202,903,167 $14.48 4.7
Granted— — 
Forfeited(6,380)19.25 
Exercised(629,755)13.96 
Outstanding at September 30, 20212,267,032 $14.61 4.1
Exercisable at September 30, 20212,259,753 $14.59 4.1
Summary of Restricted Stock Units
The following table summarizes the restricted stock unit activity under the Plan for the nine months ended September 30, 2021:




Number of Shares
Weighted-
Average
Grant Date Fair Value
Unvested at December 31, 20202,904,616 $35.72 
Granted872,135 108.00 
Forfeited(182,761)63.62 
Vested(1)
(1,557,830)30.63 
Unvested at September 30, 20212,036,160 $68.96 
(1) During the nine months ended September 30, 2021, in accordance with our Nonqualified Deferred Compensation Plan, recipients of 402,832 shares had elected to defer settlement of the vested restricted stock units and 270,567 shares were released from deferral. This resulted in total deferred units of 695,869 as of September 30, 2021.