Business Combinations - Summary of the Purchase Price Preliminarily Allocated to the Intangible Assets Acquired for the Acquisitions (Details) - USD ($) $ in Thousands	1 Months Ended					12 Months Ended
	Apr. 30, 2017	Dec. 31, 2016	Aug. 31, 2016	Jul. 31, 2016	Mar. 31, 2015	Dec. 31, 2018
Acquired Finite-Lived Intangible Assets [Line Items]
Intangible assets acquired, weighted average life						8 years
Nutfield (Final)
Acquired Finite-Lived Intangible Assets [Line Items]
Finite-lived Intangible Assets Acquired					$ 2,329
Intangible assets acquired, weighted average life					10 years
Nutfield (Final) | Trade name
Acquired Finite-Lived Intangible Assets [Line Items]
Finite-lived Intangible Assets Acquired					$ 29
Intangible assets acquired, weighted average life					1 year
Nutfield (Final) | Brand
Acquired Finite-Lived Intangible Assets [Line Items]
Finite-lived Intangible Assets Acquired					$ 0
Intangible assets acquired, weighted average life					0 years
Nutfield (Final) | Non-competition agreement
Acquired Finite-Lived Intangible Assets [Line Items]
Finite-lived Intangible Assets Acquired					$ 144
Intangible assets acquired, weighted average life					5 years
Nutfield (Final) | Technology
Acquired Finite-Lived Intangible Assets [Line Items]
Finite-lived Intangible Assets Acquired					$ 1,970
Intangible assets acquired, weighted average life					10 years
Nutfield (Final) | Customer relationships
Acquired Finite-Lived Intangible Assets [Line Items]
Finite-lived Intangible Assets Acquired					$ 95
Intangible assets acquired, weighted average life					10 years
Nutfield (Final) | Favorable in-place lease
Acquired Finite-Lived Intangible Assets [Line Items]
Finite-lived Intangible Assets Acquired					$ 91
Intangible assets acquired, weighted average life					12 years
Laser Controls Systems (Final)
Acquired Finite-Lived Intangible Assets [Line Items]
Finite-lived Intangible Assets Acquired				$ 1,400
Intangible assets acquired, weighted average life				7 years
Laser Controls Systems (Final) | Trade name
Acquired Finite-Lived Intangible Assets [Line Items]
Finite-lived Intangible Assets Acquired				$ 0
Intangible assets acquired, weighted average life				0 years
Laser Controls Systems (Final) | Brand
Acquired Finite-Lived Intangible Assets [Line Items]
Finite-lived Intangible Assets Acquired				$ 26
Intangible assets acquired, weighted average life				1 year
Laser Controls Systems (Final) | Non-competition agreement
Acquired Finite-Lived Intangible Assets [Line Items]
Finite-lived Intangible Assets Acquired				$ 29
Intangible assets acquired, weighted average life				3 years
Laser Controls Systems (Final) | Technology
Acquired Finite-Lived Intangible Assets [Line Items]
Finite-lived Intangible Assets Acquired				$ 1,319
Intangible assets acquired, weighted average life				7 years
Laser Controls Systems (Final) | Customer relationships
Acquired Finite-Lived Intangible Assets [Line Items]
Finite-lived Intangible Assets Acquired				$ 26
Intangible assets acquired, weighted average life				10 years
Laser Controls Systems (Final) | Favorable in-place lease
Acquired Finite-Lived Intangible Assets [Line Items]
Finite-lived Intangible Assets Acquired				$ 0
Intangible assets acquired, weighted average life				0 years
Photocore AG (Final)
Acquired Finite-Lived Intangible Assets [Line Items]
Finite-lived Intangible Assets Acquired			$ 1,435
Intangible assets acquired, weighted average life			7 years
Photocore AG (Final) | Trade name
Acquired Finite-Lived Intangible Assets [Line Items]
Finite-lived Intangible Assets Acquired			$ 0
Intangible assets acquired, weighted average life			0 years
Photocore AG (Final) | Brand
Acquired Finite-Lived Intangible Assets [Line Items]
Finite-lived Intangible Assets Acquired			$ 22
Intangible assets acquired, weighted average life			1 year
Photocore AG (Final) | Non-competition agreement
Acquired Finite-Lived Intangible Assets [Line Items]
Finite-lived Intangible Assets Acquired			$ 9
Intangible assets acquired, weighted average life			3 years
Photocore AG (Final) | Technology
Acquired Finite-Lived Intangible Assets [Line Items]
Finite-lived Intangible Assets Acquired			$ 1,343
Intangible assets acquired, weighted average life			7 years
Photocore AG (Final) | Customer relationships
Acquired Finite-Lived Intangible Assets [Line Items]
Finite-lived Intangible Assets Acquired			$ 61
Intangible assets acquired, weighted average life			10 years
Photocore AG (Final) | Favorable in-place lease
Acquired Finite-Lived Intangible Assets [Line Items]
Finite-lived Intangible Assets Acquired			$ 0
Intangible assets acquired, weighted average life			0 years
Lanmark (Final)
Acquired Finite-Lived Intangible Assets [Line Items]
Finite-lived Intangible Assets Acquired		$ 1,366
Intangible assets acquired, weighted average life		8 years
Lanmark (Final) | Trade name
Acquired Finite-Lived Intangible Assets [Line Items]
Finite-lived Intangible Assets Acquired		$ 0
Intangible assets acquired, weighted average life		0 years
Lanmark (Final) | Brand
Acquired Finite-Lived Intangible Assets [Line Items]
Finite-lived Intangible Assets Acquired		$ 26
Intangible assets acquired, weighted average life		1 year
Lanmark (Final) | Non-competition agreement
Acquired Finite-Lived Intangible Assets [Line Items]
Finite-lived Intangible Assets Acquired		$ 0
Intangible assets acquired, weighted average life		0 years
Lanmark (Final) | Technology
Acquired Finite-Lived Intangible Assets [Line Items]
Finite-lived Intangible Assets Acquired		$ 760
Intangible assets acquired, weighted average life		7 years
Lanmark (Final) | Customer relationships
Acquired Finite-Lived Intangible Assets [Line Items]
Finite-lived Intangible Assets Acquired		$ 580
Intangible assets acquired, weighted average life		10 years
Lanmark (Final) | Favorable in-place lease
Acquired Finite-Lived Intangible Assets [Line Items]
Finite-lived Intangible Assets Acquired		$ 0
Intangible assets acquired, weighted average life		0 years
Open Technologies
Acquired Finite-Lived Intangible Assets [Line Items]
Finite-lived Intangible Assets Acquired	$ 10,388
Intangible assets acquired, weighted average life	8 years
Open Technologies | Trade name
Acquired Finite-Lived Intangible Assets [Line Items]
Finite-lived Intangible Assets Acquired	$ 0
Intangible assets acquired, weighted average life	0 years
Open Technologies | Brand
Acquired Finite-Lived Intangible Assets [Line Items]
Finite-lived Intangible Assets Acquired	$ 103
Intangible assets acquired, weighted average life	1 year
Open Technologies | Non-competition agreement
Acquired Finite-Lived Intangible Assets [Line Items]
Finite-lived Intangible Assets Acquired	$ 0
Intangible assets acquired, weighted average life	0 years
Open Technologies | Technology
Acquired Finite-Lived Intangible Assets [Line Items]
Finite-lived Intangible Assets Acquired	$ 4,441
Intangible assets acquired, weighted average life	7 years
Open Technologies | Customer relationships
Acquired Finite-Lived Intangible Assets [Line Items]
Finite-lived Intangible Assets Acquired	$ 5,844
Intangible assets acquired, weighted average life	10 years
Open Technologies | Favorable in-place lease
Acquired Finite-Lived Intangible Assets [Line Items]
Finite-lived Intangible Assets Acquired	$ 0
Intangible assets acquired, weighted average life	0 years