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Intangible assets - Amortization of intangible assets (Details)
Dec. 31, 2019
USD ($)
Intangible assets  
2020 $ 891,667
2021 746,667
2022 582,778
2023 546,667
2024 546,667
Thereafter 1,725,554
Finite Lived Intangible Assets Net $ 5,040,000