Income Taxes - Reconciliation of Uncertain Tax Position (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2019	Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2019
Reconciliation of Unrecognized Tax Benefits, Excluding Amounts Pertaining to Examined Tax Returns [Roll Forward]
Beginning balance	$ 530	$ 482	$ 459
Settlements based on tax positions related to prior years	(530)	(238)	(109)
Additions based on tax positions related to prior years	190	286	132
Ending balance	$ 530	$ 482	$ 459	$ 190