Other Assets and Liabilities - Other Non-Current Assets (Details) - USD ($) $ in Thousands	Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2016	Dec. 31, 2014
Other Liabilities Disclosure [Abstract]
Deferred tax assets	$ 23,029	$ 3,877	$ 10,342	$ 13,102
Long-term deposits	1,477	3,350
Guarantee from Armistice (see Note 16)	5,697	0
Right of use assets at contract manufacturing organizations	5,894	2,909
Other	49	113
Total	$ 36,146	$ 10,249