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Warrants (Tables)
 12 Months Ended
Dec. 31, 2018
Notes To Financial Statements [Abstract]  
Summary of Warrant Activity

Following is a summary of all warrant activity for the two years ended December 31, 2018:

 

Warrants  

Number of

Warrants

Issued

    

Weighted

Average

Exercise

Price

  
Warrants outstanding at January 1, 2017     1,487,958     $ 9.39  
Warrants issued in connection with 2017 equity transactions     9,231,628     $ 3.46  
Warrants exercised during 2017     (7,617,147 )   $ 2.89  
Warrants expired during 2017     (44,037 )   $ 209.23  
Warrants outstanding at December 31, 2017     3,058,402     $ 5.29  
Warrants issued in connection with 2018 debt transaction     190,114     $ 2.63  
Warrants cancelled in exchange for common stock     (1,641,427 )   $ 3.04  
Warrants expired during 2018     (13,927 )   $ 226.24  
Warrants outstanding and exercisable at December 31, 2018     1,593,162     $ 5.36  
                 
Aggregate intrinsic value of outstanding warrants at December 31, 2018   $ -          
                 
Weighted average remaining contractual terms (years)     1.87