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Stock-Based Compensation
 6 Months Ended
Jun. 30, 2024
Share-Based Payment Arrangement [Abstract]  
Stock-Based Compensation Stock-Based Compensation
The following table summarizes the stock option, restricted stock unit ("RSU") and performance stock unit ("PSU") activity for the six months ended June 30, 2024:
OptionsRSUsPSUs
Number of
options		Weighted -
average
exercise price		Number of
RSUs		Weighted -
average
grant date fair value		Number of
PSUs		Weighted -
average
grant date fair value
Outstanding at January 1, 2024
7,523,971 $14.19 3,864,319 $23.60 3,373,417 $4.02 
Granted
— $— 2,361,162 $12.47 320,000 $11.58 
Exercised or released(429,681)$4.77 (913,865)$20.70 — $— 
Forfeited, cancelled or expired(1,367,699)$6.82 (235,023)$21.10 — $— 
Outstanding at June 30, 2024
5,726,591 $16.65 5,076,593 $19.06 3,693,417 $4.67 
The following table summarizes the components of stock-based compensation expense recognized for the periods presented:
Three months ended June 30,Six months ended June 30,
(in thousands)2024202320242023
Cost of services$501 $1,038 $1,181 $1,915 
Selling, general, and administrative expense10,620 14,002 20,175 26,589 
Total$11,121 $15,040 $21,356 $28,504 
As of June 30, 2024, there was $4.3 million, $41.5 million and $4.9 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 1.6 years, respectively. Certain PSUs contain performance conditions, which may result in a lesser amount of expense recognized over the term of the awards.