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Stock-Based Compensation (Tables)
6 Months Ended
Jun. 30, 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
196,275 4.82 — — 
  Less: Forfeited— — — — 
  Less: Expired— — — — 
Less: Exercised
35,000 1.70 — — 
Outstanding as of June 30, 2024
1,190,035 $4.05 7.71 $8,044,000 
Vested as of June 30, 2024(2)
1,126,019 $4.34 7.32 $4,976,000 
Exercisable as of June 30, 2024
750,768 $4.34 7.32 $4,976,000 
(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 June 30, 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 June 30, 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
501,746 7.32 
Less: Forfeited856 3.59 
Less: Vested 436,472 3.36 
Outstanding as of June 30, 2024
593,819 $6.13 
Share-based Payment Arrangement, Activity
The following table presents our total stock-based compensation expense:
Three Months Ended June 30,Six Months Ended June 30,
2024202320242023
Employee stock-based compensation expense
     Pre-tax $667 $79 $1,037 $388 
     Post-tax (1)
527 62 819 307 
Director stock-based compensation expense
     Pre-tax 113 29 171 55 
     Post-tax (1)
89 23 135 43 
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 volatility86.92  %80.84  %
Risk-free interest rate4.37  %3.44  %
Expected term6 years6 years