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Convertible Notes Payable (Tables)
 12 Months Ended
Dec. 31, 2020
2021 Convertible Notes [Member]  
Debt Instrument [Line Items]  
Carrying Value of Convertible Notes

The table below summarizes the carrying value of the 2021 Convertible Notes as of December 31, 2020:

  
December 31,
2020
    
December 31,
2019
  
             
Principal amount
  
$
5,150
    
$
52,000
  
Discount
    
(275
)
    
(6,951
)
Carrying value as of December 31, 2020
  
$
4,875
    
$
45,049
  
2022 Convertible Notes [Member]  
Debt Instrument [Line Items]  
Carrying Value of Convertible Notes

The table below summarizes the carrying value of the 2022 Convertible Notes as of December 31, 2020:

  
December 31,
2020
  
Principal amount
  
$
38,350
  
Discount
    
(3,284
)
Carrying value as of December 31, 2020
  
$
35,066