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Share Based Compensation - Summary of Share Option Activity Under Option Plans (Details) - 2018 Share Incentive Plan - USD ($)
12 Months Ended
Dec. 31, 2021
Dec. 31, 2020
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]    
Number of options, Beginning balance 991,000  
Number of options, Granted 6,000  
Number of options, Forfeited (4,500)  
Number of options, Ending balance 992,500 991,000
Number of options, Vested and expected to vest 992,500  
Number of options, Exercisable 742,125  
Weighted average exercise price, Beginning balance $ 12.27  
Weighted average exercise price, Granted 12.00  
Weighted average exercise price, Forfeited 12.27  
Weighted average exercise price, Ending balance 12.27 $ 12.27
Weighted average exercise price, Vested and expected to vest 12.28  
Weighted average exercise price, Exercisable $ 12.24  
Weighted average remaining contractual life, Outstanding 2 years 1 month 20 days 3 years 1 month 17 days
Weighted average remaining contractual life, Vested and expected to vest 2 years 1 month 20 days  
Weighted average remaining contractual life, Exercisable 2 years 1 month 20 days  
Aggregate intrinsic value, Outstanding   $ 1,257,200