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Deficit (Tables)
12 Months Ended
Dec. 31, 2021
Equity [Abstract]  
Summary of Outstanding Warrants

The following is a summary of such outstanding warrants at December 31 2021:

 

                
   Common Shares    
   Total   Currently Exercisable  

Exercise Price

per Share

   Expiration Date
                
Warrants related to August 2016 financing   2,481    2,481   $646.95   February 2, 2022
Warrants related to March 2018 financing   7,331    7,331   $245.84   September 9, 2023
Warrants related to March 2018 financing   513    513   $340.73   March 6, 2023
Warrants related to July 2018 financing   119,241    119,241   $75.48   July 25, 2023
Warrants related to July 2018 financing   7,154    7,154   $94.35   July 25, 2023
Warrants related to May 2019 financing   5,518    5,518   $26.96   May 23, 2024
Warrants related to October 2019 financing   100,719    100,719   $5.39   October 10, 2024
Warrants related to October 2019 financing   14,336    14,336   $6.74   October 8, 2024
Warrants issued by AIU that after the merger (described below)   3,281,508    3,281,508   $5.00   November 15, 2029