Acquisition (Details) - USD ($) $ in Thousands	Sep. 15, 2017	Sep. 30, 2018	Dec. 31, 2017
Business Acquisition [Line Items]
Goodwill		$ 51,438	$ 51,438
Veri [Member]
Business Acquisition [Line Items]
Business Combination, Consideration Transferred, Including Equity Interest in Acquiree Held Prior to Combination	$ 3,500
Acquisitions	3,200
Consideration, Amount of holdback	$ 300
Consideration Holdback Period	18 months
Goodwill			2,800
Technology-Based Intangible Assets [Member] | Veri [Member]
Business Acquisition [Line Items]
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Intangible Assets, Other than Goodwill			$ 700