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Stock-Based Compensation
3 Months Ended
Mar. 31, 2023
Share-Based Payment Arrangement [Abstract]  
Stock-Based Compensation Stock-Based Compensation
The following table summarizes the stock option and restricted stock unit ("RSU") activity for the three months ended March 31, 2023:
OptionsRSUs
Number of
options
Weighted -
average
exercise price
Number of
RSUs
Weighted -
average
grant date fair value
Outstanding at January 1, 2023
7,723,711 $12.98 3,895,224 $28.00 
Granted
770,937 $18.11 1,379,119 $18.14 
Exercised or released(46,132)$4.54 (200,405)$26.00 
Forfeited, cancelled or expired(334,159)$6.38 (128,503)$27.42 
Outstanding at March 31, 2023
8,114,357 $13.78 4,945,435 $25.34 
The weighted-average grant-date fair value of options granted during the three months ended March 31, 2023 was $8.85. There were 3,373,417 performance stock units ("PSUs") outstanding at January 1, 2023 and March 31, 2023.
The following table summarizes the components of stock-based compensation expense recognized for the periods presented:
Three months ended March 31,
(in thousands)20232022
Cost of services$877 $703 
Selling, general, and administrative expense12,587 18,902 
Total$13,464 $19,605 
As of March 31, 2023, there was $15.7 million, $68.8 million and $4.5 million of unrecognized compensation expense related to the Company’s unvested stock options, RSUs and PSUs, respectively, that is expected to be recognized over a weighted-average period of 1.2 years, 1.5 years and 1.5 years