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Stock-Based Compensation (Tables)
9 Months Ended
Sep. 30, 2022
Share-Based Payment Arrangement [Abstract]  
Schedule of Assumptions Used to Estimate the Fair Value of Stock Options Granted The following table summarizes the assumptions used to estimate the fair value of the 2022 CEO stock option grant:
Three Months Ended September 30,Nine Months Ended September 30,
2022202120222021
Risk-free interest rate**3.01%*
Expected term (in years)*****
Expected volatility**70%*
Expected dividend yield**—%*
* Not applicable because no stock options were granted during the period.
** Each Vesting Price Threshold for the 2022 CEO grant has a unique expected term ranging from 3.4 to 4.1 years.
Summary of the Stock Option Activity
The following table summarizes stock option activity for the nine months ended September 30, 2022:

Number of SharesWeighted Average Exercise PriceWeighted Average Remaining Contractual Term (Years)Aggregate Intrinsic Value (in thousands)
Outstanding at December 31, 2021
2,953,356 $15.16 4.0$147,812 
Granted700,000 50.63 
Exercised(902,392)27.93 31,790 
Expired(6,800)3.65 
Forfeited(10,280)12.28 
Outstanding at September 30, 2022
2,733,884 $20.07 5.3$63,622 
Exercisable at September 30, 2022
2,033,684 $9.55 3.8$63,618 
Schedule of Restricted Stock Unit Activity
The following table summarizes RSU activity for the nine months ended September 30, 2022:

Number of SharesWeighted Average Grant Date Fair Value
Non-vested and outstanding at December 31, 2021
1,209,529 $70.99 
Granted534,213 52.93 
Vested(166,836)74.30 
Forfeited(157,732)73.54 
Non-vested and outstanding at September 30, 2022
1,419,174 $63.52 
Schedule of Components of Stock-based Compensation Expense
The following table summarizes the components of our stock-based compensation expense by instrument type for the three and nine months ended September 30, 2022 and 2021 (in thousands):

Three Months Ended September 30,Nine Months Ended September 30,
2022202120222021
RSUs$9,845 $4,997 $25,378 $13,405 
Stock options1,272 47 1,517 3,820 
Common stock awards to the Board of Directors219 156 532 467 
Total stock-based compensation expense$11,336 $5,200 $27,427 $17,692 
Schedule of Stock-based Compensation Expense Included in Condensed Consolidated Statements of Operations
Stock-based compensation expense for RSUs, stock options, and issuances of common stock to the Board of Directors is included in the following line items in the accompanying consolidated statements of operations for the three and nine months ended September 30, 2022 and 2021 (in thousands):

Three Months Ended September 30,Nine Months Ended September 30,
2022202120222021
Cost of revenue
Subscriptions$284 $381 $712 $973 
Professional services1,401 777 3,788 2,283 
Operating expenses
Sales and marketing2,667 1,448 6,721 3,753 
Research and development3,454 1,263 8,831 3,347 
General and administrative3,530 1,331 7,375 7,336 
Total stock-based compensation expense$11,336 $5,200 $27,427 $17,692