Income Taxes - Unrecognized Tax Benefits (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2019	Dec. 31, 2018	Dec. 31, 2017
Reconciliation of Unrecognized Tax Benefits, Excluding Amounts Pertaining to Examined Tax Returns [Roll Forward]
Beginning of year balance	$ 2,028	$ 1,771	$ 1,900
Increases to tax positions expected to be taken	732	0	0
Increases to tax positions taken during prior years	24	272	0
Decreases to tax positions taken during prior years	0	0	(129)
Foreign currency translation	(7)	(15)	0
End of year balance	$ 2,777	$ 2,028	$ 1,771