Revenue and Accounts Receivable, Net - Changes in the Allowance for Doubtful Accounts (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2019	Dec. 31, 2018	Dec. 31, 2017
Schedule of Allowance for Doubtful Accounts
Balance at beginning of period	$ 1,121	$ 1,064	$ 904
Additions to costs and expenses	441	305	166
(Write-offs)/Foreign exchange effects	(70)	(248)	(6)
Balance at end of period	$ 1,492	$ 1,121	$ 1,064