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Debt (Tables)
6 Months Ended
Jun. 30, 2018
Debt [Abstract]  
Carrying Value of Convertible Notes
The table below summarizes the carrying value of the 2021 Convertible Notes as of June 30, 2018:

Principal amount
 
$
52,000
 
Discount
  
(12,158
)
Carrying value as of June 30, 2018
 
$
39,842