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Stock-Based Compensation | 3 Months Ended
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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:
| Options |  | RSUs
| 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) | 2023 |  | 2022 |  |  |  |
Cost of services | $ | 877 |  |  | $ | 703 |  |  |  |  |
Selling, general, and administrative expense | 12,587 |  |  | 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

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- Definition The entire disclosure for an entity's employee compensation and benefit plans, including, but not limited to, postemployment and postretirement benefit plans, defined benefit pension plans, defined contribution plans, non-qualified and supplemental benefit plans, deferred compensation, share-based compensation, life insurance, severance, health care, unemployment and other benefit plans. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -URI https://asc.fasb.org/topic&trid=2228938 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 712 -URI https://asc.fasb.org/topic&trid=2197446 Reference 3: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 710 -URI https://asc.fasb.org/topic&trid=2127225 Reference 4: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -URI https://asc.fasb.org/topic&trid=2235017 + Details
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