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Debt (Tables)
 3 Months Ended
Mar. 31, 2019
Debt Disclosure [Abstract]  
Schedule of Debt
The following table summarizes information about the equity and liability components of the Convertible Senior Notes (dollars in thousands). The fair values of the respective notes outstanding were measured based on quoted market price and is a Level 2 measurement.
 
March 31,
2019
 
December 31,
2018
Principal amount outstanding
$
58,503

 
$
58,503

Unamortized discount of liability component
(3,195
)
 
(3,637
)
Unamortized debt issuance costs
(428
)
 
(487
)
Net carrying amount of liability component
54,880

 
54,379

Less: current portion
(54,880
)
 
(54,379
)
Long-term debt
$
—

 
$
—

Carrying value of equity component, net of issuance costs
$
10,092

 
$
10,092

Fair value of outstanding Convertible Senior Notes
$
119,767

 
$
85,999

Remaining amortization period of discount on the liability component
1.8 years

 
2.0 years