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Other Assets and Liabilities - Prepaid Expenses and Other Current Assets (Details) - USD ($)
$ in Thousands
Dec. 31, 2021
Dec. 31, 2020
Other Liabilities Disclosure [Abstract]    
Income tax receivable (see Note 13) $ 29,097 $ 18,615
Prepaid and other expenses 3,179 1,018
Guarantee from Armistice 279 318
Other 271 798
Receivable from Exela (see Note 4) 0 16,500
Short-term deposit 0 1,477
Total $ 32,826 $ 38,726