Goodwill - Changes in Goodwill by Reporting Units (Details) - USD ($) $ in Thousands	12 Months Ended
Dec. 31, 2018	Dec. 31, 2017
Goodwill [Roll Forward]
Beginning Balance	$ 52,750	$ 46,744
Additions	16,423	2,412
Foreign Currency Translation	(1,899)	3,594
Ending Balance	67,274	52,750
3D Manufacturing
Goodwill [Roll Forward]
Beginning Balance	40,802	37,861
Additions	0	0
Foreign Currency Translation	(1,316)	2,941
Ending Balance	39,486	40,802
Construction BIM
Goodwill [Roll Forward]
Beginning Balance	6,521	6,078
Additions	1,010	0
Foreign Currency Translation	(226)	443
Ending Balance	7,305	6,521
Public Safety Forensics
Goodwill [Roll Forward]
Beginning Balance	3,070	2,805
Additions	0	55
Foreign Currency Translation	(107)	210
Ending Balance	2,963	3,070
3D Design
Goodwill [Roll Forward]
Beginning Balance	0	0
Additions	9,130	0
Foreign Currency Translation	(180)	0
Ending Balance	8,950	0
Photonics
Goodwill [Roll Forward]
Beginning Balance	2,357	0
Additions	6,283	2,357
Foreign Currency Translation	(70)	0
Ending Balance	$ 8,570	$ 2,357

Amount after accumulated impairment loss of an asset representing future economic benefits arising from other assets acquired in a business combination that are not individually identified and separately recognized.

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
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Amount of increase in asset representing future economic benefits arising from other assets acquired in a business combination that are not individually identified and separately recognized resulting from a business combination.

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Amount of foreign currency translation gain (loss) which increases (decreases) an asset representing future economic benefits from other assets acquired in a business combination that are not individually identified and separately recognized.

+ References

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A roll forward is a reconciliation of a concept from the beginning of a period to the end of a period.

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