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Other Assets and Liabilities - Prepaid Expenses and Other Current Assets (Details) - USD ($) $ in Thousands | Sep. 30, 2021 | Dec. 31, 2020
--- | --- | ---
Prepaid Expenses and Other Current Assets: |  |
Income tax receivable | $ 18,789 | $ 18,615
Prepaid and other expenses | 2,787 | 1,018
Other | 382 | 798
Guarantee from Armistice | 276 | 318
Short-term deposit | 0 | 1,477
Receivable from Exela (see Note 3) | 0 | 16,500
Total | $ 22,234 | $ 38,726

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