Annual report pursuant to Section 13 and 15(d)

Summary of significant accounting policies - Stock based compensation (Details)

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Summary of significant accounting policies - Stock based compensation (Details) - USD ($)
3 Months Ended 6 Months Ended 9 Months Ended 12 Months Ended
Mar. 31, 2017
Mar. 31, 2016
Jun. 30, 2017
Jun. 30, 2016
Sep. 30, 2017
Sep. 30, 2016
Dec. 31, 2017
Dec. 31, 2016
Dec. 31, 2015
Stock based compensation $ 15,886 $ 55,362 $ 29,778 $ 218,326 $ 41,629 $ 1,016,033 $ 122,432 $ 297,117 $ 375,697
General and administrative [Member]                  
Stock based compensation $ 15,886 14,711 $ 29,788 177,675 $ 41,629 223,447 297,635 256,466 146,932
Research and development [Member]                  
Stock based compensation   33,644   33,644   33,644 33,644 98,741
Sales and marketing [Member]                  
Stock based compensation   $ 7,007   $ 7,007   $ 7,007 $ 7,007 $ 130,024