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Stock-Based Compensation (Tables)
12 Months Ended
Dec. 31, 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):
Year ended December 31,
202120202019
Cost of revenue
Subscription and support
$2,868 $1,709 $1,554 
Professional services
1,729 1,434 1,725 
Operating expenses
Research and development
9,590 8,100 8,006 
Sales and marketing
13,901 11,062 8,792 
General and administrative
20,545 23,466 15,707 
Total
$48,633 $45,771 $35,784 
Schedule of Stock-Option Activity
The following table summarizes the option activity under the Plans for the year ended December 31, 2021:




Options
Weighted-
Average
Exercise
Price
Weighted-
Average
Remaining
Contractual
Term (Years)
Aggregate Intrinsic Value
(in thousands)
Outstanding at December 31, 20202,903,167 $14.48 4.7$223,941 
Granted— — 
Forfeited(6,895)19.29 
Exercised(1,141,092)14.55 
Outstanding at December 31, 20211,755,180 $14.42 4.0$203,720 
Exercisable at December 31, 20211,755,180 $14.42 4.0$203,720 
Summary of Restricted Stock Units
The following table summarizes the restricted stock unit activity under the Plan for the year ended December 31, 2021:
Number of SharesWeighted-Average Grant Date Fair Value
Unvested at December 31, 20202,904,616 $35.72 
Granted916,634 109.64 
Forfeited(218,852)64.36 
Vested(1)
(1,710,699)31.89 
Unvested at December 31, 20211,891,699 $73.04 
(1) During the year ended December 31, 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 were released from deferral. This resulted in total deferred units of 695,869 as of December 31, 2021.
Schedule of Share-based Payment Award, ESPP, Valuation Assumptions
The fair value of our ESPP purchase rights was estimated assuming no expected dividends and the following weighted-average assumptions:
Year ended December 31,
202120202019
ESPP
Expected term (in years)0.50.50.5
Risk-free interest rate0.1%
0.2% - 1.5%
1.9% - 2.6%
Expected volatility
41.8% - 45.0%
40.6% - 61.0%
35.0% - 49.0%
Schedule of Employee Stock Purchase Plan
The following table summarizes the ESPP activity under the Plan for the years ended December 31, 2021, 2020 and 2019:
For the year ended December 31,
202120202019
Shares issued148,864 186,855 188,390 
Weighted-average purchase price$59.52 $38.68 $26.13 
Total proceeds (in thousands)$8,861 $7,227 $4,922