Revenue Recognition - Allowance for Credit Loss (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2020	Dec. 31, 2019
Accounts Receivable, Allowance for Credit Loss [Roll Forward]
Beginning balance	$ 530	$ 596
Increases to the allowance for credit losses	600	215
Write-offs	(300)	(286)
Foreign exchange rate changes	1	5
Ending balance	$ 831	$ 530