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Stock-Based Compensation - Share-based compensation expense (Details) - USD ($)
3 Months Ended
Mar. 31, 2020
Mar. 31, 2019
Share-based Payment Arrangement, Expensed and Capitalized, Amount [Line Items]    
Total share based compensation expense $ 934,847 $ 1,517,302
Service based awards    
Share-based Payment Arrangement, Expensed and Capitalized, Amount [Line Items]    
Total share based compensation expense 677,740 996,375
Restricted stock units - Service based awards    
Share-based Payment Arrangement, Expensed and Capitalized, Amount [Line Items]    
Total share based compensation expense 238,115 344,351
Stock option awards - Service based awards    
Share-based Payment Arrangement, Expensed and Capitalized, Amount [Line Items]    
Total share based compensation expense 439,625 652,024
Performance based awards    
Share-based Payment Arrangement, Expensed and Capitalized, Amount [Line Items]    
Total share based compensation expense 257,107 520,927
Restricted stock units - Performance based awards    
Share-based Payment Arrangement, Expensed and Capitalized, Amount [Line Items]    
Total share based compensation expense 171,210 398,388
Stock option awards - Performance based awards    
Share-based Payment Arrangement, Expensed and Capitalized, Amount [Line Items]    
Total share based compensation expense $ 85,897 $ 122,539