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Fair Value Measurements (Tables)
3 Months Ended
Mar. 31, 2021
Fair Value Disclosures [Abstract]  
Schedule of fair value of the outstanding warrants The fair value of the outstanding warrants at February 19, 2020, the date the 2019 Warrants were no longer classified as a liability, was determined by using option pricing models with the following assumptions:

 

 

 

February 19,

 

 

 

2020

 

Expected life (in years)

 

4.3

 

Expected volatility

 

208.2%

 

Risk-free interest rates

 

1.4%