Prepaid Expense and Other Assets (Details) - Deferred Costs, Capitalized, Prepaid, and Other Assets - USD ($) $ in Thousands	Mar. 31, 2021	Dec. 31, 2020
Deferred Costs, Capitalized, Prepaid, and Other Assets [Abstract]
Royalty advances	$ 15,128	$ 13,518
Prepaid expenses	5,047	2,490
Employee retention credit	2,200	300
Income taxes receivable	983	927
Other assets	122	4
Prepaid expenses and other assets	$ 23,480	$ 17,239