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Other Long-Term Liabilities (Details) - USD ($) $ in Thousands | Dec. 31, 2020 | Dec. 31, 2019
--- | --- | ---
Other Long-Term Liabilities |  |
Net deferred tax liabilities related to IPR&D (Note 15) | $ 1,840 | $ 3,007
Deferred income from sale of tax benefits |  | 1,831
Contingent milestones (Note 4) | 8,267 | 12,485
Deferred revenue | 3,386 | 254
Total | 13,493 | 17,577
Less current portion | (3,372) | (2,026)
Long-term portion | $ 10,121 | $ 15,551

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