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Equity (Tables)
6 Months Ended
Jun. 30, 2022
Share-Based Payment Arrangement [Abstract]  
Schedule of Assumptions Used to Determine Fair Value of Stock Options Granted
The fair value of the stock options granted during the six months ended June 30, 2022 and 2021 was determined using the Black-Scholes option pricing model with the following assumptions:
 June 30,
2022
June 30,
2021
Expected volatility
73.2 - 76.0%
75.9 - 78.0%
Expected term (years)
5.5 - 7.0
5.5 - 7.0
Risk free interest rate
1.5% - 3.3%
0.5% - 1.2%
Expected dividend yield%%
Exercise price
$36.79 - $78.91
$66.82 - $82.21
Summary of Stock Option Activity
A summary of the stock option activity under the 2018 Plan during the six months ended June 30, 2022 is presented below. These amounts include stock options granted to employees and directors.
(dollars in millions,
except weighted average exercise price)
Options
Weighted Average
Exercise Price
Weighted Average
Remaining Contractual
Term (Years)
Aggregate Intrinsic Value
Outstanding at December 31, 2021
5,343,254 $44.98 
Granted1,464,743 $62.88 
Exercised(147,409)$17.61 
Forfeited(123,827)$58.27 
Outstanding at June 30, 2022
6,536,761 $49.36 8.1$54.2 
Exercisable at June 30, 2022
3,071,122 $33.89 7.1$47.1 
Summary of Restricted Stock Grant Activity
A summary of restricted stock award activity under the Incentive Plan during the six months ended June 30, 2022 is presented below. These amounts include restricted stock granted to employees and directors.
Shares
Weighted Average
Grant Date
Fair Value Per
Share
Unvested restricted stock at December 31, 2021
30,625 $16.00 
Vested(29,305)$16.00 
Cancelled(1,320)$16.00 
Unvested restricted stock at June 30, 2022
— $16.00 
A summary of restricted stock unit activity under the 2018 Plan during the six months ended June 30, 2022 is presented below. These amounts include restricted stock units granted to employees.
Shares
Weighted Average
Grant Date
Fair Value Per
Share
Unvested restricted stock units at December 31, 2021
88,307 $20.02 
Granted222,213 $63.03 
Vested(38,490)$19.36 
Cancelled(5,114)$35.21 
Unvested restricted stock units at June 30, 2022
266,916 $55.63