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Convertible debt (Tables) | 3 Months Ended
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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 Issuance |  | Unpaid Principal Balance |  |  |  | Contractual 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, 2024 |  | December 31, 2023
Principal | $ | 288,529 |  |  | $ | 288,529 |
Debt premium, net of amortization | 9,100 |  |  | 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,
|  |  |  |  | 2024 |  | 2023
Coupon interest |  |  |  |  | $ | 1,555 |  |  | $ | 1,203 |
Amortization of debt issuance costs |  |  |  |  | 323 |  |  | 373 |
Amortization of debt premium |  |  |  |  | (676) |  |  | — |
Total |  |  |  |  | $ | 1,202 |  |  | $ | 1,576 |

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- Definition Tabular disclosure of convertible debt instrument. Includes, but is not limited to, principal amount and amortized premium or discount. + References No definition available. + Details
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- Definition Tabular disclosure of information pertaining to short-term and long-debt instruments or arrangements, including but not limited to identification of terms, features, collateral requirements and other information necessary to a fair presentation. + References No definition available. + Details
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