Goodwill - Changes in Goodwill by Reporting Units (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2016	Dec. 31, 2015
Goodwill [Roll Forward]
Beginning Balance	$ 26,371	$ 19,205
Additions	20,629	8,769
Foreign Currency Translation	(256)	(1,603)
Ending Balance	46,744	26,371
Factory Metrology
Goodwill [Roll Forward]
Beginning Balance	21,360	15,556
Additions	16,709	7,103
Foreign Currency Translation	(208)	(1,299)
Ending Balance	37,861	21,360
Construction BIM-CIM
Goodwill [Roll Forward]
Beginning Balance	3,429	2,497
Additions	2,682	1,140
Foreign Currency Translation	(33)	(208)
Ending Balance	6,078	3,429
Public Safety Forensics
Goodwill [Roll Forward]
Beginning Balance	1,582	1,152
Additions	1,238	526
Foreign Currency Translation	(15)	(96)
Ending Balance	$ 2,805	$ 1,582