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DEBT (Tables) | 9 Months Ended
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Sep. 30, 2025
DEBT |
Schedule of debt | ​
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
​ | As of September 30, 2025 (unaudited) | ​ | As of December 31, 2024
​ | ​ | Principal Amount | ​ | ​ | Discounts and Deferred Financing Costs | ​ | ​ | Net Carrying Amount | ​ |  | Principal Amount | ​ | ​ | Discounts and Deferred Financing Costs | ​ | ​ | Net Carrying Amount
Convertible senior notes, non-current | ​ | 345,000 | ​ | ​ | (8,087) | ​ | ​ | 336,913 | ​ | ​ | 345,000 | ​ | ​ | (9,780) | ​ | ​ | 335,220
Total debt | $ | 345,000 | ​ | $ | (8,087) | ​ | $ | 336,913 | ​ | $ | 345,000 | ​ | $ | (9,780) | ​ | $ | 335,220
Schedule of interest expense | ​
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
​ | ​ | ​ | For the three months ended September 30, | ​ | ​ | ​ | For the nine months ended September 30,
​ | ​ | ​ | ​ | 2025 | ​ | ​ | 2024 | ​ | ​ | ​ | 2025 | ​ | ​ | 2024
​ | ​ | ​ | ​ | (unaudited) | ​ | ​ | (unaudited)
Contractual interest expense | ​ | ​ | $ | 646 | ​ | $ | 677 | ​ | ​ | $ | 1,940 | ​ | $ | 1,108
Amortization of issuance costs | ​ | ​ | ​ | 565 | ​ | ​ | 564 | ​ | ​ | ​ | 1,693 | ​ | ​ | 940
Total interest expense, convertible senior notes | ​ | ​ | $ | 1,211 | ​ | $ | 1,241 | ​ | ​ | $ | 3,633 | ​ | $ | 2,048
​

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