Fair Value Measurements (Details) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2018	Dec. 31, 2017
Fair value measurements
Contingent Consideration	$ 133	$ 133
Earn-out payments paid	0
Reconciliation of the beginning and ending balance for the Level 3 measurement
Balance at the beginning of the period	133
Balance at the end of the period	133
Level 3
Fair value measurements
Contingent Consideration	$ 133	$ 133