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Convertible debt (Tables)
 3 Months Ended
Mar. 31, 2024
Debt Disclosure [Abstract]  
Schedule of Debt [Table Text Block]
The following is a summary of the Company's convertible senior notes as of March 31, 2024 (in thousands):
Date of IssuanceUnpaid Principal BalanceContractual Interest Rates
1% Convertible Notes due in 2024 ("2024 Notes") May 2019 $21,713 1%
2.25% Convertible Notes due in 2027 ("2027 Notes")September 2020 and October 2023$266,816 2.25%
Total Notes$288,529 
Convertible Debt [Table Text Block]
The Notes consist of the following (in thousands):
March 31, 2024December 31, 2023
Principal$288,529 $288,529 
Debt premium, net of amortization9,100 9,776 
Debt issuance costs, net of amortization(3,990)(4,313)
Net carrying amount$293,639 $293,992 

The following table sets forth total interest expense recognized related to the Notes (in thousands):
Three Months Ended March 31,
20242023
Coupon interest$1,555 $1,203 
Amortization of debt issuance costs323 373 
Amortization of debt premium(676)— 
Total$1,202 $1,576