Other Assets and Liabilities - Other Non-Current Liabilities (Details) - USD ($) $ in Thousands	Dec. 31, 2019	Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2016
Other Liabilities Disclosure [Abstract]
Provision for retirement indemnity	$ 0	$ 1,024	$ 1,303
Customer allowances	981	1,352
Unrecognized tax benefits	6,465	5,315	$ 3,954	$ 1,686
Guarantee to Deerfield	1,372	5,717
Other	55	594
Total	$ 8,873	$ 14,002