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Convertible Subordinated Notes (Tables)
 9 Months Ended
Sep. 30, 2019
Convertible Subordinated Notes [Abstract]  
Schedule of Liability and Equity Components of Convertible Subordinated Notes
The carrying values of the liability and equity components of the Convertible Notes at December 31, 2018 and September 30, 2019 are reflected on our Consolidated Balance Sheet as follows (in thousands):
 
December 31, 2018
 
September 30, 2019
Long-term liabilities:
 
 
 
Principal amount
$
6,346

 
$
6,319

Unamortized discount of liability component
(560
)
 
(382
)
Convertible Notes issuance costs, net of accumulated amortization of $106 and $125, respectively
(54
)
 
(35
)
Carrying value of the liability component
$
5,732

 
$
5,902

 
 
 
 
Carrying value of the equity component
$
789

 
$
789