Quarterly report pursuant to Section 13 or 15(d)

Stock based compensation, options and warrants (Schedule of Award Activity) (Details)

v3.19.2
Stock based compensation, options and warrants (Schedule of Award Activity) (Details) - USD ($)
6 Months Ended 12 Months Ended
Jun. 30, 2019
Dec. 31, 2018
Stock Incentive Plan [Member]    
Shares Underlying Options    
Outstanding at January 1, 2019 62,000  
Forfeited (50,000)  
Outstanding at June 30, 2019 12,000 62,000
Exercisable at June 30, 2019 12,000  
Weighted Average Exercise Price    
Outstanding at June 30, 2019 $ 15.71  
Forfeited 18.50  
Outstanding at June 30, 2019 4.09 $ 15.71
Exercisable at June 30, 2019 $ 4.09  
Weighted Average Remaining Contractual Term    
Outstanding at June 30, 2019 9 years 2 months 12 days 9 years 2 months 12 days
Exercisable at June 30, 2019 9 years 2 months 12 days  
Aggregate Intrinsic Value    
Outstanding at June 30, 2019  
Outstanding at June 30, 2019
Exercisable at June 30, 2019  
Other common stock purchase options and warrants [Member]    
Shares Underlying Options    
Outstanding at January 1, 2019 1,671,113  
Granted 1,908,144  
Forfeited (5,000)  
Outstanding at June 30, 2019 3,574,257 1,671,113
Exercisable at June 30, 2019 1,928,144  
Weighted Average Exercise Price    
Outstanding at June 30, 2019 $ 39.47  
Granted 1.94  
Forfeited 7.90  
Outstanding at June 30, 2019 19.48 $ 39.47
Exercisable at June 30, 2019 $ 19.48  
Weighted Average Remaining Contractual Term    
Outstanding at June 30, 2019 5 years 2 months 12 days 2 years
Granted 3 years 4 months 24 days  
Exercisable at June 30, 2019 8 months 12 days  
Aggregate Intrinsic Value    
Outstanding at June 30, 2019  
Granted 2,537,832  
Outstanding at June 30, 2019 2,289,773
Exercisable at June 30, 2019