Quarterly report pursuant to Section 13 or 15(d)

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

v3.19.2
Basis of presentation, summary of significant accounting policies (Narrative) (Details) - USD ($)
3 Months Ended 6 Months Ended
Jun. 30, 2019
Jun. 30, 2019
Jan. 28, 2019
Dec. 31, 2018
Conversion of notes into shares 1,813,500      
Fair value of notes $ 10,225,959 $ 10,225,959    
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]        
Conversion of notes into shares 1,813,500      
Fair value of notes $ 10,200,000 3,900,000    
Senior Secured Convertible Promissory Notes [Member] | Investors [Member]        
Debt instrument face amount $ 3,358,333 $ 3,358,333 $ 3,358,333  
Warrant issued     1,908,144