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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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