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Debt - Impact to Shareholders' Equity (Details) - USD ($)
$ in Thousands
1 Months Ended 12 Months Ended
Aug. 31, 2018
Dec. 31, 2020
Dec. 31, 2018
Debt Instrument [Line Items]      
Total   $ 46,832 $ 52,194
2023 Notes | Convertible Debt      
Debt Instrument [Line Items]      
Conversion option $ 53,820    
Purchase of capped calls (26,910)    
Issuance costs (1,626)    
Total 25,284    
2025 Notes | Convertible Debt      
Debt Instrument [Line Items]      
Conversion option 48,346    
Purchase of capped calls (27,255)    
Issuance costs (1,514)    
Total $ 19,577