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Fair value of financial instruments - Convertible notes receivable (Details)
9 Months Ended
Sep. 30, 2019
USD ($)
Fair value of financial instruments  
Convertible notes receivable, December 31, 2018 $ 837,317
Notes issued (face value $215,000), at fair value 196,000
Increase in fair value 531,405
Conversion of notes into common stock $ (1,564,722)