Acquisitions - Schedule of Recognized Identified Assets Acquired and Liabilities Assumed (Details) $ in Thousands	Dec. 31, 2018 USD ($)
Business Acquisition [Line Items]
Goodwill	$ 74,802
Apex Optimisation
Business Acquisition [Line Items]
Tangible assets acquired, net	(1,164)
Goodwill	17,483
Deferred tax liabilities, net	(1,619)
Total assets acquired	23,000
Developed Technology Rights | Apex Optimisation
Business Acquisition [Line Items]
Finite-lived intangible assets acquired	4,500
Customer Relationship | Apex Optimisation
Business Acquisition [Line Items]
Finite-lived intangible assets acquired	$ 3,800