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Stock-Based Compensation (Tables)
9 Months Ended
Sep. 30, 2021
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
Outstanding as of December 31, 2020144,006 $13.00 8.77 $— 
Granted1,054,707 3.86 — 
  Less: Forfeited48,995 8.08 — 
  Less: Expired2,503 16.25 — 
Less: Exercised
— — — 
Outstanding as of September 30, 2021
1,147,215 $4.80 9.74 $153 
Vested as of September 30, 2021(1)
120,638 $15.31 7.71 $— 
Exercisable as of September 30, 2021
61,232 $15.27 7.71 $— 
Schedule of Nonvested Share Activity
The following table presents certain information related to the activity of our non-vested common stock grants:
Number of Restricted SharesWeighted Average Grant Date Fair Value
Outstanding as of December 31, 2020259,006 $10.06 
Granted 290,577 6.02 
Less: Forfeited119,946 8.92 
Less: Vested 92,910 9.99 
Outstanding as of September 30, 2021
336,727 $7.01 
Share-based Payment Arrangement, Activity
The following table presents our total stock-based compensation expense:

Three Months Ended September 30,Nine Months Ended September 30,
2021202020212020
Employee stock-based compensation expense
     Pre-tax $270 $108 $495 $582 
     Post-tax (1)
213 86 391 460 
Director stock-based compensation expense
     Pre-tax 66 99 243 406 
     Post-tax (1)
52 78 192 321 
Schedule of Share-based Payment Award, Stock Options, Valuation Assumptions The following weighted-average assumptions were used to value the stock options granted:
2021
Expected annual dividend yield1.23  %
Expected volatility43.87  %
Risk-free interest rate1.81  %
Expected term6