Prepaid Expense and Other Assets (Details) - Deferred Costs, Capitalized, Prepaid, and Other Assets - USD ($) $ in Thousands	Jun. 30, 2021	Dec. 31, 2020
Deferred Costs, Capitalized, Prepaid, and Other Assets [Abstract]
Royalty advances	$ 12,174	$ 13,518
Short term deposits	11,674	0
Prepaid expenses	5,329	2,490
Employee retention credit	2,327	300
Income taxes receivable	990	927
Other assets	1	4
Prepaid expenses and other assets	$ 32,495	$ 17,239