Prepaid Expenses and Other Current Assets - Summary of Prepaid Expenses and Other Current Assets (Details) - USD ($) $ in Thousands	Dec. 31, 2020	Dec. 31, 2019
Prepaid Expense And Other Assets Current [Abstract]
Income taxes receivable	$ 28,564
Prepaid expenses	17,484	$ 5,014
Lease incentive receivable	1,600	7,389
Total prepaid expenses and other current assets	$ 46,048	$ 12,403