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STOCK-BASED COMPENSATION (Tables)
 12 Months Ended
Dec. 31, 2021
Share-based Payment Arrangement [Abstract]  
Key assumptions used in valuing market-based awards The key assumptions used in valuing these market-based awards were as follows:
2019
Risk-free interest rate2.57 %
Dividend yield— %
Expected volatility85.00 %
Stock-based compensation expense activity The following table reflects the outstanding RSAs and activity related thereto for the year ended December 31, 2021:
Service-based AwardsService and Performance-based AwardsService and Market-based AwardsService, Performance, and Market-based Awards
Number of SharesWeighted-average Grant Date Fair ValueNumber of SharesWeighted-average Grant Date Fair ValueNumber of SharesWeighted-average Grant Date Fair ValueNumber of SharesWeighted-average Grant Date Fair Value
Outstanding at December 31, 2020268,602 $10.44 16,250 $27.00 5,245 $16.70 39,200 $9.80 
Shares granted339,653 16.45 — — — — — — 
Shares forfeited(13,355)11.62 — — — — (1,000)9.80 
Shares vested(174,778)14.23 (16,250)27.00 (5,245)16.70 (19,600)9.80 
Outstanding at December 31, 2021420,122 $13.68 — $— — $— 18,600 $9.80