Segment Reporting - Summary of Reportable Segment Information (Details) - USD ($) $ in Thousands	3 Months Ended	9 Months Ended
Sep. 30, 2019	Sep. 30, 2018	Sep. 30, 2019	Sep. 30, 2018
Segment Reporting Information [Line Items]
Total sales	$ 90,516	$ 99,705	$ 277,624	$ 290,783
Segment profit	50,772	50,612	154,531	158,712
General and administrative	15,662	13,102	44,471	36,789
Research and development	10,783	11,740	33,048	34,138
Income (loss) from operations	(5,891)	(2,712)	(10,426)	(92)
3D Manufacturing
Segment Reporting Information [Line Items]
Total sales	56,017	64,182	171,586	190,584
Construction BIM
Segment Reporting Information [Line Items]
Total sales	23,884	23,710	73,485	69,994
Emerging Verticals
Segment Reporting Information [Line Items]
Total sales	10,615	11,813	32,553	30,205
Operating Segments
Segment Reporting Information [Line Items]
Segment profit	20,554	22,130	67,093	70,835
Operating Segments \| 3D Manufacturing
Segment Reporting Information [Line Items]
Segment profit	13,660	15,190	48,004	52,489
Operating Segments \| Construction BIM
Segment Reporting Information [Line Items]
Segment profit	6,720	6,106	20,113	16,999
Operating Segments \| Emerging Verticals
Segment Reporting Information [Line Items]
Segment profit	$ 174	$ 834	$ (1,024)	$ 1,347

The aggregate total of expenses of managing and administering the affairs of an entity, including affiliates of the reporting entity, which are not directly or indirectly associated with the manufacture, sale or creation of a product or product line.

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Aggregate revenue less cost of goods and services sold or operating expenses directly attributable to the revenue generation activity.

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The aggregate costs incurred (1) in a planned search or critical investigation aimed at discovery of new knowledge with the hope that such knowledge will be useful in developing a new product or service, a new process or technique, or in bringing about a significant improvement to an existing product or process; or (2) to translate research findings or other knowledge into a plan or design for a new product or process or for a significant improvement to an existing product or process whether intended for sale or the entity's use, during the reporting period charged to research and development projects, including the costs of developing computer software up to the point in time of achieving technological feasibility, and costs allocated in accounting for a business combination to in-process projects deemed to have no alternative future use.

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Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table.

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