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Stock-Based Compensation (Tables)
3 Months Ended
Mar. 31, 2024
Share-Based Payment Arrangement [Abstract]  
Schedule of Share-based Compensation, Stock Options and Stock Appreciation Rights Award Activity
The following table presents certain information related to the activity of our non-vested stock option grants:
Number of Stock OptionsWeighted Average Exercise PricesWeighted Average Remaining Contractual Term (years)
Aggregate Intrinsic Value (3)
Outstanding as of December 31, 2023(1)
1,028,760 $3.83 7.80 $6,151,000 
Granted
— — — — 
  Less: Forfeited— — — — 
  Less: Expired— — — — 
Less: Exercised
— — — — 
Outstanding as of March 31, 2024
1,028,760 $3.83 7.55 $7,368,000 
Vested as of March 31, 2024(2)
920,818 $4.78 7.31 $3,736,000 
Exercisable as of March 31, 2024
580,568 $4.78 7.31 $3,736,000 
(1) Contingent options granted during 2023 have been excluded from the calculations above.
(2) The vested shares are calculated based on all vested shares at March 31, 2024, inclusive of those that have since expired. The weighted average exercise prices, weighted-average remaining contractual term and aggregate intrinsic value is calculated based on only vested shares that are outstanding and exercisable at March 31, 2024.
(3) Presented in ones.
Schedule of Nonvested Share Activity
The following table presents certain information related to the activity of our non-vested restricted common stock grants:
Number of Restricted SharesWeighted Average Grant Date Fair Value
Outstanding as of December 31, 2023(1)
445,646 $2.64 
Granted
30,000 9.46 
Less: Forfeited856 3.59 
Less: Vested 32,233 4.36 
Outstanding as of March 31, 2024
442,557 $2.98 
Share-based Payment Arrangement, Activity
The following table presents our total stock-based compensation expense:
Three Months Ended March 31,
20242023
Employee stock-based compensation expense
     Pre-tax $369 $309 
     Post-tax (1)
292 244 
Director stock-based compensation expense
     Pre-tax 59 26 
     Post-tax (1)
47 21 
Schedule of Share-based Payment Award, Stock Options, Valuation Assumptions The following weighted-average assumptions were used to value the stock options granted:
20242023
Expected annual dividend yield—  %—  %
Expected volatility—  %80.84  %
Risk-free interest rate—  %3.44  %
Expected termN/A6 years