Business Acquisitions (Details 1) - USD ($) $ in Thousands			12 Months Ended
	Nov. 04, 2016	Jun. 30, 2016	Dec. 31, 2015	Dec. 31, 2016
Business Acquisition [Line Items]
Finite-lived intangible assets acquired	$ 200
DVTEL [Member]
Business Acquisition [Line Items]
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Finite-Lived Intangibles			$ 27,380	$ 27,380
Armasight, Inc. [Member]
Business Acquisition [Line Items]
Finite-lived intangible assets acquired		$ 7,600
Point Grey Research, Inc. [Member]
Business Acquisition [Line Items]
Intangible assets acquired	$ 39,800
Product Technology [Member] | Point Grey Research, Inc. [Member]
Business Acquisition [Line Items]
Estimated Useful Life	10 years
Patented Technology [Member] | DVTEL [Member]
Business Acquisition [Line Items]
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Finite-Lived Intangibles			$ 21,500
Weighted average estimated useful life			7 years 6 months
Trade name | DVTEL [Member]
Business Acquisition [Line Items]
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Finite-Lived Intangibles			$ 3,800
Weighted average estimated useful life			10 years
Trade name | Armasight, Inc. [Member]
Business Acquisition [Line Items]
Estimated Useful Life		4 years
Finite-lived intangible assets acquired		$ 5,200
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] | Armasight, Inc. [Member]
Business Acquisition [Line Items]
Estimated Useful Life		3 years
Finite-lived intangible assets acquired		$ 1,000
In-process research and development | DVTEL [Member]
Business Acquisition [Line Items]
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Finite-Lived Intangibles			$ 1,700
Backlog | DVTEL [Member]
Business Acquisition [Line Items]
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Finite-Lived Intangibles			$ 380
Weighted average estimated useful life			1 year
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
Trade Secrets | Armasight, Inc. [Member]
Business Acquisition [Line Items]
Estimated Useful Life		6 years
Finite-lived intangible assets acquired		$ 1,400
Developed technology | Point Grey Research, Inc. [Member]
Business Acquisition [Line Items]
Indefinite-lived intangible assets acquired	$ 23,100
In-process research and development | DVTEL [Member]
Business Acquisition [Line Items]
Indefinite-lived Intangible Assets Acquired			n/a