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Convertible debt (Tables)
12 Months Ended
Dec. 31, 2024
Debt Instrument [Line Items]  
Convertible Debt [Table Text Block]
The Notes consist of the following (in thousands):
December 31, 2024December 31, 2023
Principal$266,816 $288,529 
Debt premium, net of amortization7,092 9,776 
Debt issuance costs, net of amortization(3,111)(4,313)
Net carrying amount$270,797 $293,992 
The following table sets forth total interest expense recognized related to the Notes (in thousands):
Year Ended December 31,
202420232022
Coupon$6,078 $5,145 $4,813 
Amortization of debt issuance costs1,202 1,349 1,491 
Amortization of debt premium(2,684)(612)— 
Total$4,596 $5,882 $6,304