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Convertible debt (Tables) | 9 Months Ended
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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 Issuance |  | Unpaid Principal Balance |  |  |  | Contractual 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 2020 |  | 150,000 |  |  |  |  |  |  | 2.25%
Total Notes |  |  | $ | 293,750 |  |  |  |  |  |  |
Convertible Debt [Table Text Block] | The Notes consist of the following (in thousands):
| September 30, 2023 |  | December 31, 2022
Principal | $ | 293,750 |  |  | $ | 293,750 |
Debt premium, embedded derivative and debt issuance cost, net of amortization | 427 |  |  | (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,
| 2023 |  | 2022 |  | 2023 |  | 2022
Coupon interest | $ | 1,203 |  |  | $ | 1,203 |  |  | $ | 3,609 |  |  | $ | 3,609 |
Amortization of debt issuance costs | 294 |  |  | 373 |  |  | 1,040 |  |  | 1,119 |
Total | $ | 1,497 |  |  | $ | 1,576 |  |  | $ | 4,649 |  |  | $ | 4,728 |

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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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