Business Combinations - Summary of the Purchase Price Allocated to the Intangible Assets (Details) - USD ($) $ in Thousands			1 Months Ended
	Mar. 16, 2018	Mar. 09, 2018	Apr. 30, 2017
Nutfield (Final)
Acquired Finite-Lived Intangible Assets [Line Items]
Intangible assets acquired			$ 2,329
Intangible assets acquired, weighted average life (in years)			10 years
Nutfield (Final) | Trade name
Acquired Finite-Lived Intangible Assets [Line Items]
Intangible assets acquired			$ 29
Intangible assets acquired, weighted average life (in years)			1 year
Nutfield (Final) | Brand
Acquired Finite-Lived Intangible Assets [Line Items]
Intangible assets acquired			$ 0
Intangible assets acquired, weighted average life (in years)			0 years
Nutfield (Final) | Non-competition agreement
Acquired Finite-Lived Intangible Assets [Line Items]
Intangible assets acquired			$ 144
Intangible assets acquired, weighted average life (in years)			5 years
Nutfield (Final) | Technology
Acquired Finite-Lived Intangible Assets [Line Items]
Intangible assets acquired			$ 1,970
Intangible assets acquired, weighted average life (in years)			10 years
Nutfield (Final) | Customer relationship
Acquired Finite-Lived Intangible Assets [Line Items]
Intangible assets acquired			$ 95
Intangible assets acquired, weighted average life (in years)			10 years
Nutfield (Final) | Favorable in-place lease
Acquired Finite-Lived Intangible Assets [Line Items]
Intangible assets acquired			$ 91
Intangible assets acquired, weighted average life (in years)			12 years
Laser Control Systems Limited
Acquired Finite-Lived Intangible Assets [Line Items]
Intangible assets acquired		$ 1,400
Intangible assets acquired, weighted average life (in years)		7 years
Laser Control Systems Limited | Trade name
Acquired Finite-Lived Intangible Assets [Line Items]
Intangible assets acquired		$ 0
Intangible assets acquired, weighted average life (in years)		0 years
Laser Control Systems Limited | Brand
Acquired Finite-Lived Intangible Assets [Line Items]
Intangible assets acquired		$ 26
Intangible assets acquired, weighted average life (in years)		1 year
Laser Control Systems Limited | Non-competition agreement
Acquired Finite-Lived Intangible Assets [Line Items]
Intangible assets acquired		$ 29
Intangible assets acquired, weighted average life (in years)		3 years
Laser Control Systems Limited | Technology
Acquired Finite-Lived Intangible Assets [Line Items]
Intangible assets acquired		$ 1,319
Intangible assets acquired, weighted average life (in years)		7 years
Laser Control Systems Limited | Customer relationship
Acquired Finite-Lived Intangible Assets [Line Items]
Intangible assets acquired		$ 26
Intangible assets acquired, weighted average life (in years)		10 years
Laser Control Systems Limited | Favorable in-place lease
Acquired Finite-Lived Intangible Assets [Line Items]
Intangible assets acquired		$ 0
Intangible assets acquired, weighted average life (in years)		0 years
Photocore AG
Acquired Finite-Lived Intangible Assets [Line Items]
Intangible assets acquired	$ 1,435
Intangible assets acquired, weighted average life (in years)	7 years
Photocore AG | Trade name
Acquired Finite-Lived Intangible Assets [Line Items]
Intangible assets acquired	$ 0
Intangible assets acquired, weighted average life (in years)	0 years
Photocore AG | Brand
Acquired Finite-Lived Intangible Assets [Line Items]
Intangible assets acquired	$ 22
Intangible assets acquired, weighted average life (in years)	1 year
Photocore AG | Non-competition agreement
Acquired Finite-Lived Intangible Assets [Line Items]
Intangible assets acquired	$ 9
Intangible assets acquired, weighted average life (in years)	3 years
Photocore AG | Technology
Acquired Finite-Lived Intangible Assets [Line Items]
Intangible assets acquired	$ 1,343
Intangible assets acquired, weighted average life (in years)	7 years
Photocore AG | Customer relationship
Acquired Finite-Lived Intangible Assets [Line Items]
Intangible assets acquired	$ 61
Intangible assets acquired, weighted average life (in years)	10 years
Photocore AG | Favorable in-place lease
Acquired Finite-Lived Intangible Assets [Line Items]
Intangible assets acquired	$ 0
Intangible assets acquired, weighted average life (in years)	0 years