Quarterly report pursuant to Section 13 or 15(d)

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

v3.19.1
Stock based compensation, options and warrants (Schedule of Award Activity) (Details) - USD ($)
3 Months Ended 12 Months Ended
Mar. 31, 2019
Dec. 31, 2018
Stock Incentive Plan [Member]    
Shares Underlying Options    
Outstanding, beginning 62,000  
Granted  
Exercised  
Forfeited  
Outstanding, ending 62,000 62,000
Exercisable 62,000  
Weighted Average Exercise Price    
Outstanding, beginning $ 15.71  
Granted  
Exercised  
Forfeited  
Outstanding, ending 15.71 $ 15.71
Exercisable $ 15.71  
Weighted Average Remaining Contractual Term    
Outstanding 9 years 9 years 2 months 12 days
Exercisable 9 years  
Aggregate Intrinsic Value    
Outstanding  
Outstanding, ending
Exercisable  
Other common stock purchase options and warrants [Member]    
Shares Underlying Options    
Outstanding, beginning 1,671,113  
Granted 1,908,144  
Outstanding, ending 3,579,257 1,671,113
Exercisable 3,579,257  
Weighted Average Exercise Price    
Outstanding, beginning $ 39.47  
Granted 1.94  
Outstanding, ending 19.46 $ 39.47
Exercisable $ 19.46  
Weighted Average Remaining Contractual Term    
Outstanding 5 years 2 months 12 days 2 years
Granted 3 years 7 months 6 days  
Exercisable 5 years 2 months 12 days  
Aggregate Intrinsic Value    
Outstanding  
Granted 2,537,832  
Outstanding, ending 2,537,832
Exercisable $ 2,537,832