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Common Stock and Common Stock Purchase Warrants (Tables)
12 Months Ended
Dec. 31, 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    
   December 31, 2021   Weighted Average Exercise Price / Share   December 31, 2020   Weighted Average Exercise Price / Share   Expiration Date
Series Z Warrants   11,937,455   $1.60   16,814,939  $1.60  April 2024
UPO - Series Z Warrants      $    53,000   $1.60   January 2021
Series W Warrants   377,873   $5.00    381,818   $5.00   January 2022
Total   12,315,328   $1.70    17,249,757   $1.68