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Prepaid Expense and Other Assets (Details) - Deferred Costs, Capitalized, Prepaid, and Other Assets - USD ($)
$ in Thousands
Sep. 30, 2021
Dec. 31, 2020
Deferred Costs, Capitalized, Prepaid, and Other Assets [Abstract]    
Royalty advances $ 4,626 $ 13,518
Prepaid expenses 4,184 2,490
Employee retention credit 2,327 300
Income taxes receivable 979 927
Other assets 254 4
Prepaid expenses and other assets $ 12,370 $ 17,239