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Other Assets and Liabilities - Other Current Liabilities (Details) - USD ($)
$ in Thousands
Mar. 31, 2021
Dec. 31, 2020
Other Liabilities, Current [Abstract]    
Accrued interest $ 1,078 $ 2,695
Due to Exela 0 2,026
Guarantee to Deerfield 272 319
Other 165 160
Other current liabilities $ 1,515 $ 5,200