Other Long-Term Liabilities (Details) - USD ($) $ in Thousands	Jun. 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)	7,587	12,485
Deferred Revenue (Note 11)	303	254
Total	12,500	17,577
Less Current Portion	(2,104)	(2,026)
Long-Term Portion	$ 10,396	$ 15,551