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Warrants to Purchase Common Stock (Tables)
3 Months Ended
Mar. 31, 2018
Notes to Financial Statements  
Summary of activity related to warrants

A summary of activity related to warrants for the three months ended March 31, 2018 follows:  

 

    Shares   Weighted- Average Exercise Price ($)   Weighted-Average Remaining Contractual Term
  Outstanding at December 31, 2017       828,221     $ 1.51       —    
  Outstanding at March 31, 2018        828,221     $ 1.51       6.10  
                             
  Exercisable at March 31, 2018       828,221     $ 1.51       6.10