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Other Assets and Liabilities - Other Non-Current Liabilities (Details) - USD ($)
$ in Thousands
Sep. 30, 2020
Dec. 31, 2019
Other Non-Current Liabilities:    
Customer allowances $ 659 $ 981
Unrecognized tax benefits 3,143 6,465
Guarantee to Deerfield 1,121 1,372
Other 15 55
Total   $ 4,938 $ 8,873