Quarterly report pursuant to Section 13 or 15(d)

Fair value of financial instruments (Details 4)

v3.19.2
Fair value of financial instruments (Details 4) - USD ($)
6 Months Ended
Jun. 30, 2019
Jun. 30, 2018
Debt Disclosure [Abstract]    
Investment in warrants, December 31, 2018 $ 67,000  
Warrants issued to the Company 19,000  
Increase in fair value 55,000 $ 0
Conversion of warrants into common stock (141,000)  
Investment in warrants, June 30, 2019 $ 0