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Other Assets and Liabilities - Prepaid Expenses and Other Current Assets (Details) - USD ($) $ in Thousands | Dec. 31, 2020 | Dec. 31, 2019
--- | --- | ---
Other Liabilities Disclosure [Abstract] |  |
Valued-added tax recoverable | $ 341 | $ 1,051
Prepaid and other expenses | 1,018 | 2,116
Guarantee from Armistice | 318 | 454
Income tax receivable (see Note 14) | 18,615 | 536
Receivable from Exela (see Note 4) | 16,500 | 0
Short-term deposit | 1,477 | 0
Other | 457 | 107
Total | $ 38,726 | $ 4,264

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