Other Assets and Liabilities - Other Non-Current Assets (Details) - USD ($) $ in Thousands	Mar. 31, 2019	Dec. 31, 2018
Other Non-Current Assets:
Deferred tax assets	$ 23,216	$ 23,029
Long-term deposits	1,477	1,477
Guarantee from Armistice	5,555	5,697
Right of use assets at contract manufacturing organizations	5,827	5,894
Other	49	49
Total	$ 36,124	$ 36,146