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Convertible Senior Notes - Interest expenses incurred on Convertible notes payable (Details) - USD ($)
3 Months Ended 9 Months Ended
Sep. 30, 2020
Sep. 30, 2020
Convertible Senior Notes    
Coupon interest $ 891,250 $ 1,226,667
Amortization of debt issuance costs 187,499 247,604
Total interest expense on Notes $ 1,078,749 $ 1,474,271