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Convertible debt (Tables)
 9 Months Ended
Sep. 30, 2023
Debt Disclosure [Abstract]  
Schedule of Debt [Table Text Block]
The following is a summary of the Company's convertible senior notes as of September 30, 2023 (in thousands):
Date of IssuanceUnpaid Principal BalanceContractual Interest Rates
1% Convertible Notes due in 2024 ("2024 Notes") May 2019 $21,713 1%
1% Convertible Notes due in 2024 ("2024 Notes") - subject to the exchange agreements May 2019 122,037 1%
2.25% Convertible Notes due in 2027 ("2027 Notes")September 2020150,000 2.25%
Total Notes$293,750 
Convertible Debt [Table Text Block]
The Notes consist of the following (in thousands):
September 30, 2023December 31, 2022
Principal$293,750 $293,750 
Debt premium, embedded derivative and debt issuance cost, net of amortization427 (3,971)
Net carrying amount$294,177 $289,779 

The following table sets forth total interest expense recognized related to the Notes (in thousands):
Three Months Ended September 30,Nine Months Ended September 30,
2023202220232022
Coupon interest$1,203 $1,203 $3,609 $3,609 
Amortization of debt issuance costs294 373 1,040 1,119 
Total$1,497 $1,576 $4,649 $4,728