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Stockholders’ Equity and Common Stock Purchase Warrants (Tables)
6 Months Ended
Jun. 30, 2021
Equity [Abstract]  
Schedule of Outstanding Warrants to Purchase Common Stock

The common stock purchase warrants (classified in permanent equity) outstanding as of the dates indicated are as follows:

 

   Common Stock Purchase Warrants Issued and Outstanding at 
       Weighted       Weighted    
   June 30,   Average
Exercise
   December 31,   Average
Exercise
   Expiration
   2021   Price /Share   2020   Price/Share   Date
Series Z Warrants   15,074,281   $1.60    16,814,939   $1.60   April 2024
UPO - Series Z Warrants      $    53,000   $1.60   January 2021
Series W Warrants   381,818   $5.00    381,818   $5.00   January 2022
Total   15,456,099   $1.68    17,249,757   $1.57