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Convertible Senior Notes (Tables)
 6 Months Ended
Jun. 30, 2019
Debt Disclosure [Abstract]  
Summary of Equity And Liability Components of the Notes
The following table summarizes information about the equity and liability components of the Notes (in thousands): 
 
June 30, 2019
 
Principal amount of 2024 Notes outstanding
$
80,000
 
 
Unamortized discount (including unamortized debt issuance cost)
(20,745
)
 
Total long-term portion of notes payable
$
59,255
 
 
 
 
 
 
 
 
 
 
 
Equity component of notes
 
$
17,624

 
 
 
 
Less: Deferred tax liability
 
 
(4,065
)
 
 
 
 
Less: Issuance costs
 
 
(1,094
)
 
 
 
 
Capital in excess of Par Value
 
$
12,465