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Warrants to Purchase Common Stock (Tables)
6 Months Ended
Jun. 30, 2019
Notes To Financial Statements Abstract  
Summary of activity related to warrants

A summary of activity related to warrants for the six months ended June 30, 2019 follows: 

 

    Shares  Weighted Average Exercise Price  Weighted Average Remaining Contractual Term
Outstanding at January 1, 2019   4,531,924   $0.72    4.56 
Outstanding at June 30, 2019   4,531,924    0.72    4.56 
Exercisable at June 30, 2019   4,531,924    0.72    4.56 

 

A summary of activity related to warrants for the six months ended June 30, 2018 follows:

 

    Shares  Weighted- Average Exercise Price ($)  Weighted-Average Remaining Contractual Term
Outstanding at January 1, 2018   828,221   $1.51     
Outstanding at June 30, 2018    828,221   $1.51    6.10 
Exercisable at June 30, 2018   828,221   $1.51    6.10