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Other Assets and Liabilities - Other Current Liabilities (Details) - USD ($) $ in Thousands | Sep. 30, 2021 | Dec. 31, 2020
--- | --- | ---
Other Liabilities, Current [Abstract] |  |
Accrued interest | $ 1,078 | $ 2,695
Guarantee to Deerfield | 277 | 319
Other | 116 | 160
Due to Exela | 0 | 2,026
Other current liabilities | $ 1,471 | $ 5,200

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