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Other Long-Term Liabilities (Tables) | 9 Months Ended
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Sep. 30, 2021
Other Long-Term Liabilities |
Schedule of other long-term liabilities | ​
​ | ​ | ​ | ​ | ​ | ​ | ​
​ |  | September 30, |  | December 31,
​ | ​ | 2021 | ​ | 2020
​ | ​ | (In thousands)
Net deferred tax liabilities related to IPR&D (Note 11) | ​ | $ | 1,613 | ​ | $ | 1,840
Contingent milestones (Note 3) | ​ | ​ | 7,107 | ​ | ​ | 8,267
Deferred revenue (Note 10) | ​ |  | 601 | ​ |  | 3,386
Total | ​ |  | 9,321 | ​ |  | 13,493
Less current portion | ​ |  | (1,721) | ​ |  | (3,372)
Long-term portion | ​ | $ | 7,600 | ​ | $ | 10,121

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