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]
Prepaid maintenance and other	$ 1,185	$ 615
Prepaid insurance	1,443	57
Tax receivable	2,711	722
Interest receivable	20	213
Other current assets	363	179
Total prepaid expenses and other current assets	$ 5,722	$ 1,786