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Warrants (Tables)
3 Months Ended
Mar. 31, 2019
Warrants and Rights Note Disclosure [Abstract]  
Schedule of Warrants to Purchase Common Stock Outstanding

The Company has warrants to purchase its common stock outstanding as of March 31, 2019, as follows:

 

Issued

   Classification      Warrants
Outstanding
     Exercise
Price
     Expiration  

September 2016

     Liability        508,714      $ 2.25        November 2021  

March 2015

     Equity        3,699        9.75        March 2025  

July 2014

     Equity        6,566        7.99        July 2024  

July 2012

     Equity        52,046        0.01        July 2022