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Intangible assets - Amortization of intangible assets (Details)
Dec. 31, 2020
USD ($)
Intangible assets  
2021 $ 746,667
2022 582,778
2023 546,667
2024 546,667
2025 485,556
Thereafter 1,239,998
Finite Lived Intangible Assets Net $ 4,148,333