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Share-Based Compensation Expense (Tables)
12 Months Ended
Dec. 31, 2023
Share-Based Payment Arrangement [Abstract]  
Schedule of stock option award activity
The Company grants stock options to certain employees that will vest over a period of one to four years. A summary of stock option award activity for the years ended December 31, 2023 and 2022 was as follows:
Options
Shares
Weighted Average
Exercise Price
Weighted Average Remaining Contractual Term
Outstanding at December 31, 20211,217,161 $11.20 7.2
Granted5,435 15.60 
Exercised(333,102)1.92 
Cancelled or forfeited(128,086)35.36 
Outstanding at December 31, 2022
761,408 $11.12 2.7
Granted— — 
Exercised(489,436)1.94 
Cancelled or forfeited(78,816)51.48 
Outstanding at December 31, 2023
193,156 $17.89 5.8
Exercisable at December 31, 2023
191,635 $17.50 5.8
Schedule of Fair Value of Stock Options Assumptions The fair value of stock options issued during the year ended December 31, 2022 was measured with the following assumptions:
2022
Expected volatility
78.1-88.2%
Expected term (in years)6.25
Risk-free interest rate
0.1-1.3%
Expected dividend yield0.0 %
Schedule of fair value of restricted stock awards Restricted stock units activity during the years ended December 31, 2023 and 2022 was as follows:
Number of
Shares
Weighted Average Grant Date Fair Value Per Share
Non-vested, at December 31, 2021
75,554 $48.48 
Granted1,404,870 9.60 
Vested(132,792)14.40 
Cancelled or forfeited(118,543)21.60 
Non-vested, at December 31, 2022
1,229,089 $10.40 
Granted693,506 6.36 
Vested(531,029)12.55 
Cancelled or forfeited(289,471)10.10 
Non-vested, at December 31, 2023
1,102,095 $7.74 
Share-Based Payment Arrangement, Restricted Stock Unit, Activity
The fair value and derived service period of each tranche was as follows:
Stock Price TrancheFair ValueDerived Service Period (in years)
$25.84$8.881.72
42.968.482.71
60.008.243.30
77.127.923.70
94.167.764.11
111.287.524.42
128.327.284.64
145.447.124.78
162.486.965.00
179.606.805.10