Business Acquisitions (Details 1) - USD ($) $ in Thousands	Nov. 30, 2016	Nov. 04, 2016
Business Acquisition [Line Items]
Finite-lived intangible assets acquired		$ 200
Point Grey Research, Inc. [Member]
Business Acquisition [Line Items]
Intangible assets acquired		$ 39,800
Product Technology [Member] | Prox Dynamics, AS [Member]
Business Acquisition [Line Items]
Estimated Useful Life	8 years
Product Technology [Member] | Point Grey Research, Inc. [Member]
Business Acquisition [Line Items]
Estimated Useful Life		10 years
Patented Technology [Member] | Prox Dynamics, AS [Member]
Business Acquisition [Line Items]
Estimated Useful Life	8 years
Finite-lived intangible assets acquired	$ 3,100
Trade name | Prox Dynamics, AS [Member]
Business Acquisition [Line Items]
Estimated Useful Life	7 years
Finite-lived intangible assets acquired	$ 3,500
Trade name | Point Grey Research, Inc. [Member]
Business Acquisition [Line Items]
Estimated Useful Life		7 years
Finite-lived intangible assets acquired		$ 13,200
Trade Names [Member] | Prox Dynamics, AS [Member]
Business Acquisition [Line Items]
Estimated Useful Life	8 years
Finite-lived intangible assets acquired	$ 1,400
Backlog | Point Grey Research, Inc. [Member]
Business Acquisition [Line Items]
Estimated Useful Life		1 year
Finite-lived intangible assets acquired		$ 2,300
Non-Competition Agreements | Point Grey Research, Inc. [Member]
Business Acquisition [Line Items]
Estimated Useful Life		5 years
Finite-lived intangible assets acquired		$ 1,000
Developed technology | Prox Dynamics, AS [Member]
Business Acquisition [Line Items]
Indefinite-lived intangible assets acquired		23,400
Developed technology | Point Grey Research, Inc. [Member]
Business Acquisition [Line Items]
Indefinite-lived intangible assets acquired		$ 23,100