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Debt (Details) - USD ($)
$ in Thousands
Jun. 30, 2023
Dec. 31, 2022
Debt    
Principal $ 563,955 $ 451,120
Unaccreted Discount (122,935) (847)
Debt Issuance Costs (8,616) (8,508)
Carrying Value 432,404 441,765
Convertible senior notes, due 2026    
Debt    
Principal 225,000 425,000
Debt Issuance Costs (3,909) (8,508)
Carrying Value 221,091 416,492
Convertible senior notes, due 2028    
Debt    
Principal 333,334  
Unaccreted Discount (122,877)  
Debt Issuance Costs (4,707)  
Carrying Value 205,750  
Advance funding arrangement    
Debt    
Principal 5,321 15,670
Unaccreted Discount (32) (760)
Carrying Value 5,289 14,910
Term loan facility, due 2029    
Debt    
Principal   10,000
Carrying Value   10,000
Other notes    
Debt    
Principal 300 450
Unaccreted Discount (26) (87)
Carrying Value $ 274 $ 363