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Other Assets and Liabilities - Other Non-Current Liabilities (Details) - USD ($)
$ in Thousands
Sep. 30, 2021
Dec. 31, 2020
Other Non-Current Liabilities:    
Tax liabilities and other $ 3,155 $ 3,159
Guarantee to Deerfield 844 1,053
Total   $ 3,999 $ 4,212