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Convertible Subordinated Notes (Tables)
 6 Months Ended
Jun. 30, 2020
Convertible Subordinated Notes [Abstract]  
Schedule of Liability and Equity Components of Convertible Subordinated Notes The carrying values of the liability and equity components of our 2.75% convertible subordinated notes due 2021 (the “Convertible Notes”) at December 31, 2019 and June 30, 2020 are reflected on our Consolidated Balance Sheet as follows (in thousands):
 
December 31, 2019

 
June 30, 2020

Current liabilities:
 
 
 
Principal amount
$
6,319

 
$
6,319

Unamortized discount of liability component
(319
)
 
(187
)
Convertible Notes issuance costs, net of accumulated amortization of $130 and $142, respectively
(29
)
 
(17
)
Carrying value of the liability component
$
5,971

 
$
6,115

 
 
 
 
Carrying value of the equity component
$
789

 
$
789


The interest expense and accretion of debt discount and debt issuance costs related to our Convertible Notes during the three and six months ended June 30, 2019 and 2020 is as follows (in thousands):
 
Three months ended June 30,
 
Six months ended June 30,
 
2019

 
2020

 
2019

 
2020

Convertible Notes interest expense
$
44

 
$
43

 
$
87

 
$
87

Convertible Notes accretion of debt discount
59

 
66

 
117

 
131

Convertible Notes amortization of debt issuance costs
5

 
6

 
11

 
12