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Debt - Carrying Amount of Equity Component (Details) - Convertible Debt - USD ($)
$ in Thousands
Dec. 31, 2020
May 01, 2020
Dec. 31, 2019
Aug. 31, 2018
Debt Instrument [Line Items]        
Debt discount for conversion option $ 102,166   $ 102,166  
Issuance costs (3,140)   (3,140)  
Net carrying amount 99,026   99,026  
2023 Notes        
Debt Instrument [Line Items]        
Debt discount for conversion option 53,820   53,820  
Issuance costs (1,626)   (1,626)  
Net carrying amount 52,194   52,194 $ 53,800
2025 Notes        
Debt Instrument [Line Items]        
Debt discount for conversion option 48,346   48,346  
Issuance costs (1,514)   (1,514)  
Net carrying amount $ 46,832 $ 48,300 $ 46,832