Quarterly report pursuant to Section 13 or 15(d)

Basis of presentation, summary of significant accounting policies (Narrative) (Details)

v3.19.1
Basis of presentation, summary of significant accounting policies (Narrative) (Details) - USD ($)
Mar. 31, 2019
Jan. 28, 2019
Dec. 31, 2018
Expected operating liabilities to be recorded from adoption of FASB ASU 2016-02     $ 1,500,000
Senior Secured Promissory Notes [Member]      
Warrant issued   1,908,144  
Senior Secured Convertible Promissory Notes [Member] | Investors [Member]      
Debt instrument face amount $ 3,358,333 $ 3,358,333  
Warrant issued   1,908,144