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Debt - Summary (Details) - USD ($)
$ in Thousands
Mar. 31, 2020
Dec. 31, 2019
Debt    
Total debt $ 433,484 $ 433,484
Unamortized debt discount and issuance costs (54,332) (56,364)
Net long-term debt 379,152 377,120 [1]
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 $ (52,703) $ (54,597)
[1] Consolidated balance sheet as of December 31, 2019 has been derived from audited consolidated financial statements.