Acquisitions - Narrative (Details) - USD ($) $ in Thousands	1 Months Ended			12 Months Ended
	Oct. 31, 2018	Sep. 30, 2018	Jan. 31, 2018	Dec. 31, 2018	Dec. 31, 2017
Business Acquisition [Line Items]
Goodwill acquired in acquisition				$ 14,606
Intangible assets acquired				$ 52,724	$ 48,470
AdvantageTec
Business Acquisition [Line Items]
Aggregate purchase price	$ 11,200
Cash payment in acquisition	6,000
Equity consideration in acquisition	4,300
Potential earn-out consideration payments based on achieving targets	900
Goodwill acquired in acquisition	9,100
Intangible assets acquired	2,200
Acquisition costs incurred	600
Deferred tax liability for intangible assets	500
Assets acquired liabilities assumed, net liability	$ (100)
Conversable
Business Acquisition [Line Items]
Aggregate purchase price		$ 5,700
Cash payment in acquisition		1,300
Equity consideration in acquisition		2,900
Potential earn-out consideration payments based on achieving targets		1,500
Goodwill acquired in acquisition		5,500
Intangible assets acquired		500
Assets acquired liabilities assumed, net liability		$ (300)
BotCentral
Business Acquisition [Line Items]
Equity consideration in acquisition			$ 1,000
Intangible assets acquired			1,200
Business acquisition transaction costs			$ 200