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