Business Combination - Schedule of consideration allocation (Details) - USD ($) $ in Thousands		12 Months Ended
	Oct. 16, 2018	Dec. 31, 2018	Dec. 31, 2017
Business Acquisition [Line Items]
Purchase Consideration			$ 13,482
Net Tangible Assets Acquired/ (liabilities assumed)			94
Purchased Intangible Assets			12,156
Goodwill		$ 7,225	1,549
1Mobility
Business Acquisition [Line Items]
Purchase Consideration		4,000
Net Tangible Assets Acquired/ (liabilities assumed)		0
Purchased Intangible Assets		3,700
Goodwill		300
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Deferred Tax Liabilities		0
Layered Insight
Business Acquisition [Line Items]
Purchase Consideration	$ 13,400
Net Tangible Assets Acquired/ (liabilities assumed)		80
Purchased Intangible Assets		9,600
Goodwill		5,376
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Deferred Tax Liabilities		$ (1,622)
Nevis
Business Acquisition [Line Items]
Purchase Consideration			5,753
Net Tangible Assets Acquired/ (liabilities assumed)			14
Purchased Intangible Assets			5,156
Goodwill			583
NetWatcher
Business Acquisition [Line Items]
Purchase Consideration			7,729
Net Tangible Assets Acquired/ (liabilities assumed)			80
Purchased Intangible Assets			7,000
Goodwill			649
Nevis and NetWatcher
Business Acquisition [Line Items]
Goodwill			$ 1,232