Acquisitions - ViDi Systems S.A. (Details) - ViDi Systems S.A. [Member]	Apr. 04, 2017 USD ($)
Business Acquisition [Line Items]
Purchase price	$ 23,015,000
Cash paid in purchase price	20,019,000
Holdback security	$ 2,996,000
Holdback limitation period	18 months
Tax deductible goodwill	$ 5,112,000
Non-compete agreements
Business Acquisition [Line Items]
Intangible assets, useful life	3 years
Technology-Based Intangible Assets [Member]
Business Acquisition [Line Items]
Intangible assets, useful life	6 years