Other Assets and Liabilities - Other Non-Current Liabilities (Details) - USD ($) $ in Thousands	Dec. 31, 2020	Dec. 31, 2019	Dec. 31, 2018	Dec. 31, 2017
Other Liabilities Disclosure [Abstract]
Customer allowances	$ 0	$ 981
Unrecognized tax benefits	3,143	6,465	$ 5,315	$ 3,954
Guarantee to Deerfield	1,053	1,372
Other	16	55
Total	$ 4,212	$ 8,873