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Other Long-Term Liabilities (Tables) | 12 Months Ended
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Dec. 31, 2021
Other Long-Term Liabilities |
Schedule of other long-term liabilities | ​
​ | ​ | ​ | ​ | ​ | ​ | ​
​ |  | December 31, |  | December 31,
​ | ​ | 2021 | ​ | 2020
​ | ​ | (In thousands)
Net deferred tax liabilities related to IPR&D (Note 15) | ​ | $ | 1,613 | ​ | $ | 1,840
Contingent milestones (Note 4) | ​ | ​ | 6,862 | ​ | ​ | 8,267
Deferred revenue (Note 13) | ​ | ​ | 433 | ​ | ​ | 3,386
Total | ​ | ​ | 8,908 | ​ | ​ | 13,493
Less current portion | ​ | ​ | (1,554) | ​ | ​ | (3,372)
Long-term portion | ​ | $ | 7,354 | ​ | $ | 10,121

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