Other Long-Term Liabilities (Details) - USD ($) $ in Thousands	Sep. 30, 2020	Dec. 31, 2019
Other Long-Term Liabilities
Net Deferred Tax Liabilities Related to IPR&D (Note 12)	$ 2,779	$ 3,007
Deferred Income From Sale of Tax Benefits	1,831	1,831
Contingent Milestones (Note 3)	8,249	12,485
Deferred Revenue (Note 11)	553	254
Total	13,412	17,577
Less Current Portion	(2,362)	(2,026)
Long-Term Portion	$ 11,050	$ 15,551