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Long-term Debt (Tables)
 12 Months Ended
Dec. 31, 2019
Debt Disclosure [Abstract]  
Schedule of Long-term Debt Instruments
The liability and equity components of the Notes consisted of the following (in thousands):
 
December 31,
 
2019
 
2018
Liability component:
 
 
 
     Principal
$
143,750

 
$
143,750

     Less: Unamortized debt discount
(16,033
)
 
(19,806
)
               Unamortized debt issuance costs
(3,053
)
 
(3,877
)
Net carrying amount
$
124,664

 
$
120,067

 
 
 
 
Equity component:
 
 
 
     Debt discount for conversion option, net of taxes
$
15,547

 
$
15,547

     Less: Issuance costs, net of taxes
(523
)
 
(523
)
Net carrying amount
$
15,024

 
$
15,024


Interest expense for the years ended December 31, 2019 and 2018 related to the Notes consisted of the following (in thousands):
 
Year Ended December 31,
 
2019
 
2018
Coupon interest
$
3,414

 
$
1,043

Amortization of debt discount
3,773

 
1,111

Amortization of debt issuance costs
824

 
252

     Total interest expense recognized
$
8,011

 
$
2,406