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Debt (Tables)
9 Months Ended
Sep. 30, 2019
Debt [Abstract]  
Carrying Value of Convertible Notes
The table below summarizes the carrying value of the 2021 Convertible Notes as of September 30, 2019:

Principal amount
 
$
52,000
 
Discount
  
(7,903
)
Carrying value as of September 30, 2019
 
$
44,097