Other Assets and Liabilities - Accrued Expenses (Details) - USD ($) $ in Thousands	Dec. 31, 2019	Dec. 31, 2018
Other Liabilities Disclosure [Abstract]
Accrued compensation	$ 3,944	$ 3,971
Accrued social charges	592	1,009
Accrued restructuring (see Note 18)	2,949	879
Customer allowances	6,470	6,541
Accrued contract research organization charges	2,098	1,000
Accrued contract manufacturing organization costs	735	2,028
Accrued contract sales organization and marketing costs	0	3,469
Other	3,022	2,798
Total	$ 19,810	$ 21,695