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Goodwill and Intangible Assets - Expected amortization expenses (Details)
Sep. 30, 2019
USD ($)
Goodwill and Intangible Assets  
2019 (excluding the three months ended March 31, 2019) $ 761,702
2020 3,046,811
2021 2,991,255
2022 2,870,339
2023 2,860,534
2024 and thereafter 8,252,069
Total amortization to be recognized $ 20,782,710