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Convertible Senior Notes - Interest Expense related to 2025 Notes (Details) - 0.125% Convertible Senior Notes due 2025 - USD ($)
$ in Thousands
3 Months Ended 6 Months Ended
Jun. 30, 2022
Jun. 30, 2021
Jun. 30, 2022
Jun. 30, 2021
Debt Instrument [Line Items]        
Contractual interest expense $ 233 $ 233 $ 467 $ 467
Amortization of issuance costs 842 837 1,682 1,672
Total $ 1,075 $ 1,070 $ 2,149 $ 2,139