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Debt (Details)
$ in Thousands
Sep. 30, 2021
USD ($)
Debt  
Principal $ 429,600
Unaccreted Discount (92)
Debt Issuance Costs (11,425)
Carrying Value 418,083
Convertible senior notes, due 2026  
Debt  
Principal 425,000
Debt Issuance Costs (11,371)
Carrying Value $ 413,629
Interest rate (stated) 0.75%
Line of credit, due 2022  
Debt  
Principal $ 4,000
Debt Issuance Costs (54)
Carrying Value 3,946
Other notes  
Debt  
Principal 600
Unaccreted Discount (92)
Carrying Value $ 508