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Convertible Senior Notes (Tables) - 3.75% Convertible Senior Notes | 12 Months Ended
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Dec. 31, 2023
Debt Instrument [Line Items] |
Schedule of net proceeds from the Convertible Senior Notes | ​
​ | ​ | ​
Principal amount | $ | 212,463
Less: initial purchasers' discount | ​ | (6,374)
Less: cost of related capped calls | ​ | (16,253)
Less: other issuance costs | ​ | (617)
Net proceeds | $ | 189,219
Schedule of Convertible Senior Notes | The 3.75% Convertible Senior Notes consisted of the following (in thousands): ​
​ | ​ | ​ | ​ | ​ | ​
​ | December 31, | ​ | December 31,
​ | 2023 | ​ | 2022
Principal amounts: | ​ | ​ | ​ | ​ | ​
Principal | $ | 197,278 | ​ | $ | 197,278
Unamortized debt issuance costs (1) | ​ | (2,014) | ​ | ​ | (3,359)
Net carrying amount | $ | 195,264 | ​ | $ | 193,919
1) | Included in the consolidated balance sheets within the 3.75% Convertible Senior Notes, net and amortized over the remaining life of the notes using the effective interest rate method.
​
Schedule of debt | The following table summarizes the total interest expense and effective interest rate related to the 3.75% Convertible Senior Notes (in thousands, except for effective interest rate): ​
​ | ​ | ​ | ​ | ​ | ​ | ​
​ | ​ | December 31, | ​ | ​ | December 31,
​ |  | 2023 |  | ​ | 2022
Interest expense | ​ | $ | 7,546 | ​ | $ | 7,398
Amortization of debt issuance costs | ​ | ​ | 1,345 | ​ | ​ | 1,286
Total | ​ | ​ | 8,891 | ​ | ​ | 8,684
Effective interest rate | ​ | ​ | 4.6% | ​ | ​ | 4.5%
​

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