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Convertible debt (Tables)
 6 Months Ended
Jun. 30, 2024
Debt Disclosure [Abstract]  
Schedule of Debt [Table Text Block]
The following is a summary of the Company's convertible senior notes as of June 30, 2024 (in thousands):
Date of IssuanceUnpaid Principal BalanceContractual Interest Rates
1% Convertible Notes due in 2024 ("2024 Notes") May 2019 $— 1%
2.25% Convertible Notes due in 2027 ("2027 Notes")September 2020 and October 2023$266,816 2.25%
Total Notes$266,816 
Convertible Debt [Table Text Block]
The Notes consist of the following (in thousands):
June 30, 2024December 31, 2023
Principal$266,816 $288,529 
Debt premium, net of amortization8,427 9,776 
Debt issuance costs, net of amortization(3,690)(4,313)
Net carrying amount$271,553 $293,992 

The following table sets forth total interest expense recognized related to the Notes (in thousands):
Three Months Ended June 30,Six Months Ended June 30,
2024202320242023
Coupon interest$1,520 $1,203 $3,075 $2,406 
Amortization of debt issuance costs301 373 624 746 
Amortization of debt premium(673)— (1,349)— 
Total$1,148 $1,576 $2,350 $3,152