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Debt - Summary (Details) - USD ($)
$ in Thousands
Jun. 30, 2019
Dec. 31, 2018
Debt    
Total debt $ 447,234 $ 447,234
Unamortized debt discount and issuance costs (60,559) (64,379)
Net long-term debt 386,675 382,855 [1]
Term B Loan | Senior secured term loans    
Debt    
Total debt 13,750 13,750
2023 Notes | Convertible subordinated notes    
Debt    
Total debt 240,984 240,984
2025 Notes | Convertible senior notes    
Debt    
Total debt 192,500 192,500
Unamortized debt discount and issuance costs $ (58,261) $ (61,766)
[1] Condensed consolidated balance sheet as of December 31, 2018 has been derived from audited consolidated financial statements.