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Other Assets and Liabilities - Accrued Expenses (Details) - USD ($)
$ in Thousands
Sep. 30, 2021
Dec. 31, 2020
Accrued Expenses    
Accrued professional fees $ 4,661 $ 2,781
Accrued compensation 2,403 1,697
Accrued outsource contract costs 909 473
Customer allowances 722 1,030
Accrued restructuring (see Note 12) 43 520
Total   $ 8,738 $ 6,501