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Convertible Subordinated Notes (Tables)
 3 Months Ended
Mar. 31, 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 March 31, 2019 are reflected on our Consolidated Balance Sheet as follows (in thousands):
 
December 31, 2018
 
March 31, 2019
Long-term liabilities:
 
 
 
Principal amount
$
6,346

 
$
6,346

Unamortized discount of liability component
(560
)
 
(502
)
Convertible Notes issuance costs, net of accumulated amortization of $106 and $112, respectively
(54
)
 
(48
)
Carrying value of the liability component
$
5,732

 
$
5,796

 
 
 
 
Carrying value of the equity component
$
789

 
$
789