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Convertible Notes (Tables)
 6 Months Ended
Jun. 30, 2019
Debt Disclosure [Abstract]  
Convertible Notes
The Notes at June 30, 2019 and December 31, 2018 consisted of the following (in thousands):
 
June 30,
December 31,
 
2019
2018
Outstanding principal
$
171,500

$
171,500

Unamortized debt discount
(43,869
)
(48,430
)
Unamortized debt issuance
(2,714
)
(2,996
)
Net carrying amount of the liability component
124,917

120,074