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