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Other Long-Term Liabilities (Details) - USD ($) $ in Thousands | Dec. 31, 2019 | Dec. 31, 2018
--- | --- | ---
Other Long-Term Liabilities |  |
Net Deferred Tax Liabilities Related to IPR&D (Note 15) | $ 3,007 | $ 3,007
Deferred Income From Sale of Tax Benefits | 1,831 | 4,218
Other |  | 1,083
Contingent Milestones (Note 4) | 12,485 | 13,779
Deferred Revenue | 254 | 1,586
Total | 17,577 | 23,673
Less Current Portion | (2,026) | (4,526)
Long-Term Portion | $ 15,551 | $ 19,147

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