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Stock Incentive Plans - Non-cash Compensation Expenses (Details) - USD ($)
12 Months Ended
Dec. 31, 2021
Dec. 31, 2020
Dec. 31, 2019
Dec. 31, 2018
Dec. 31, 2017
Dec. 31, 2016
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]            
Stock-based compensation expense       $ 9,207,480 $ 8,738,615 $ 2,206,690
Scenario, Forecast            
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]            
Non-cash compensation expense $ 500,000 $ 1,700,000 $ 4,700,000      
2016 and 2014 Plan            
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]            
Non-cash compensation expense       $ 9,207,480 $ 8,738,615 $ 2,206,690