Revenue from Contracts with Customers - Schedule of Changes in Contract Liabilities Balance (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2020	Dec. 31, 2019
Movement in Contract with Customer Liability [Roll Forward]
Contract liabilities at beginning of period	$ 1,080	$ 947
Increases to deferred revenue for cash received in advance from customers	8,243	16,297
Contract with Customer, Liability, Revenue Recognized During the Year	(8,550)	(16,164)
Contract liabilities at end of period	$ 773	$ 1,080