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Commitments and contingencies (Tables)
12 Months Ended
Dec. 31, 2018
Commitments and Contingencies Disclosure [Abstract]  
Schedule of Future Minimum Rental Payments for Operating Leases [Table Text Block]
Future minimum lease payments under these non-cancellable operating leases as of December 31, 2018 are as follows:
 
2019
 
$
474,831
 
2020
 
 
335,471
 
2021
 
 
83,886
 
 
 
$
894,188