Fair Value Measurements - Reconciliation of Unobservable Inputs (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2019	Dec. 31, 2018
Acquisition-related contingent consideration liability:
Beginning balance	$ 1,275	$ 2,689
Payment	(1,331)	(1,315)
Foreign currency transaction (gain) loss	56	(99)
Ending balance	$ 0	$ 1,275