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Convertible Notes (Tables)
 3 Months Ended
Mar. 31, 2019
Debt Disclosure [Abstract]  
Convertible Notes
Convertible notes consisted of the following as of March 31, 2019 and December 31, 2018 follows (in thousands):
 
March 31,
December 31,
 
2019
2018
Outstanding principal
$
171,500

$
171,500

Unamortized debt discount
(46,182
)
(48,430
)
Unamortized debt issuance
(2,857
)
(2,996
)
Net carrying amount of the liability component
122,461

120,074