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Convertible Senior Notes (Details)
$ in Thousands
Jun. 30, 2018
USD ($)
Convertible Senior Notes  
Net carrying amount $ 59,812
Convertible Senior Notes  
Convertible Senior Notes  
Principal amount 100,000
Unamortized debt discount (37,900)
Unamortized debt issuance costs (2,288)
Net carrying amount 59,812
Carrying amount of the equity component $ 37,702