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Debt (Details) - USD ($)
$ in Thousands
Sep. 30, 2023
Dec. 31, 2022
Debt    
Principal $ 560,131 $ 451,120
Unaccreted Discount (119,125) (847)
Debt Issuance Costs (8,173) (8,508)
Carrying Value 432,833 441,765
Convertible senior notes, due 2026    
Debt    
Principal 225,000 425,000
Unaccreted Discount 0 0
Debt Issuance Costs (3,611) (8,508)
Carrying Value 221,389 416,492
Convertible senior notes, due 2028    
Debt    
Principal 333,334  
Unaccreted Discount (119,106)  
Debt Issuance Costs (4,562)  
Carrying Value 209,666  
Advance funding arrangement    
Debt    
Principal 1,497 15,670
Unaccreted Discount 0 (760)
Debt Issuance Costs 0 0
Carrying Value 1,497 14,910
Other notes    
Debt    
Principal 300 450
Unaccreted Discount (19) (87)
Debt Issuance Costs 0 0
Carrying Value $ 281 363
Term loan facility, due 2029    
Debt    
Principal   10,000
Unaccreted Discount   0
Debt Issuance Costs   0
Carrying Value   $ 10,000