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Intangible assets (Details 1)
Dec. 31, 2018
USD ($)
Finite-Lived Intangible Assets [Line Items]  
2019 $ 728,889
2020 215,000
2021 100,000
2022 93,333
2023 93,333
Thereafter 661,112
Finite Lived Intangible Assets Net $ 1,891,667