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Other Long-Term Liabilities (Details) - USD ($) $ in Thousands	Jun. 30, 2018	Dec. 31, 2017
Other Long-Term Liabilities
Net Deferred Tax Liabilities Related to IPR&P (Note 12)	$ 3,007	$ 3,772
Deferred Income From Sale of Tax Benefits	6,402	6,756
Other	1,477	1,344
Contingent Milestones (Note 4)	22,367	43,400
Deferred Revenue (Note 11)	1,879	2,813
Total	35,132	58,085
Less Current Portion	(4,784)	(6,566)
Long-Term Portion	$ 30,348	$ 51,519

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