Segment Reporting - Summary of Reportable Segment Information (Details) - USD ($) $ in Thousands	3 Months Ended
Mar. 31, 2019	Mar. 31, 2018
Segment Reporting Information [Line Items]
Total sales	$ 93,617	$ 92,834
Segment profit	55,019	53,786
General and administrative	13,224	11,073
Depreciation and amortization	4,749	4,343
Research and development	9,935	9,406
Income (loss) from operations	358	693
3D Manufacturing
Segment Reporting Information [Line Items]
Total sales	56,567	60,657
Construction BIM
Segment Reporting Information [Line Items]
Total sales	25,440	22,682
Emerging Verticals
Segment Reporting Information [Line Items]
Total sales	11,610	9,495
Operating Segments
Segment Reporting Information [Line Items]
Segment profit	28,266	25,515
Operating Segments \| 3D Manufacturing
Segment Reporting Information [Line Items]
Segment profit	19,170	18,425
Operating Segments \| Construction BIM
Segment Reporting Information [Line Items]
Segment profit	8,427	6,451
Operating Segments \| Emerging Verticals
Segment Reporting Information [Line Items]
Segment profit	$ 669	$ 639

The current period expense charged against earnings on long-lived, physical assets not used in production, and which are not intended for resale, to allocate or recognize the cost of such assets over their useful lives; or to record the reduction in book value of an intangible asset over the benefit period of such asset; or to reflect consumption during the period of an asset that is not used in production.

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