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Other Long-Term Liabilities (Details) - USD ($) $ in Thousands | Dec. 31, 2017 | Dec. 31, 2016
--- | --- | ---
Other Long-Term Liabilities |  |
Net Deferred Tax Liabilities related to IPR&D (Note 14) | $ 3,772 | $ 28,054
Deferred Income from Sale of Tax Benefits | 6,756 | 9,436
Other | 1,344 | 2,091
Contingent Milestones (Note 4) | 43,400 | 44,200
Deferred Revenue | 2,813 | 3,749
Total | 58,085 | 87,530
Less Current Portion | (6,566) | (4,826)
Long-Term Portion | $ 51,519 | $ 82,704

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