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Stock-Based Compensation (Tables)
6 Months Ended
Jun. 30, 2022
Share-Based Payment Arrangement [Abstract]  
Assumptions Used to Estimate the Fair Value of Stock Options Granted
The only stock option awarded during the three and six months ended June 30, 2022 and 2021 was the 2022 CEO Grant. The following table summarizes the assumptions used to estimate the fair value of the 2022 CEO stock option grant:

Three Months Ended June 30,Six Months Ended June 30,
2022202120222021
Risk-free interest rate3.01%*3.01%*
Expected term (in years) **4.1****
Expected volatility70%*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 six months ended June 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(877,788)28.52 30,644 
Expired(6,780)3.63 
Forfeited(10,180)12.18 
Outstanding at June 30, 2022
2,758,608 $19.95 5.5$77,903 
Exercisable at June 30, 2022
2,057,108 $9.51 4.1$77,863 
Schedule of Restricted Stock Unit Activity
The following table summarizes RSU activity for the six months ended June 30, 2022:

Number of SharesWeighted Average Grant Date Fair Value
Non-vested and outstanding at December 31, 2021
1,209,529 $70.99 
Granted394,218 53.66 
Vested(99,672)68.03 
Forfeited(125,791)76.23 
Non-vested and outstanding at June 30, 2022
1,378,284 65.78 
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 six months ended June 30, 2022 and 2021 (in thousands):

Three Months Ended June 30,Six Months Ended June 30,
2022202120222021
RSUs$8,747 $4,403 $15,533 $8,408 
Stock options244 40 245 3,773 
Common stock awards to the Board of Directors157 155 313 311 
Total stock-based compensation expense$9,148 $4,598 $16,091 $12,492 
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 six months ended June 30, 2022 and 2021 (in thousands):

Three Months Ended June 30,Six Months Ended June 30,
2022202120222021
Cost of revenue
Subscriptions$249 $295 $428 $592 
Professional services1,330 865 2,387 1,506 
Operating expenses
Sales and marketing2,266 1,197 4,054 2,305 
Research and development3,063 1,069 5,377 2,084 
General and administrative2,240 1,172 3,845 6,005 
Total stock-based compensation expense$9,148 $4,598 $16,091 $12,492