Goodwill and Intangible Assets, Net - Schedule of Intangible Assets (Details) - USD ($) $ in Thousands	9 Months Ended	12 Months Ended
	Sep. 30, 2018	Dec. 31, 2017
Finite Lived Intangible Assets [Line Items]
Gross carrying amount	$ 33,065	$ 15,356
Accumulated amortization	(11,065)	(6,722)
Net carrying amount	22,000	8,634
Developed Technology
Finite Lived Intangible Assets [Line Items]
Gross carrying amount	5,736	4,065
Accumulated amortization	(3,006)	(2,017)
Net carrying amount	$ 2,730	$ 2,048
Developed Technology | Weighted Average
Finite Lived Intangible Assets [Line Items]
Weighted average life (years)	3 years 10 days	3 years 15 days
Tradenames
Finite Lived Intangible Assets [Line Items]
Gross carrying amount	$ 3,253	$ 2,495
Accumulated amortization	(1,318)	(701)
Net carrying amount	$ 1,935	$ 1,794
Tradenames | Weighted Average
Finite Lived Intangible Assets [Line Items]
Weighted average life (years)	4 years 5 months 4 days	5 years 2 months 5 days
Non-compete
Finite Lived Intangible Assets [Line Items]
Gross carrying amount	$ 240	$ 240
Accumulated amortization	(200)	(110)
Net carrying amount	$ 40	$ 130
Non-compete | Weighted Average
Finite Lived Intangible Assets [Line Items]
Weighted average life (years)	2 years	2 years
Customer Relationships
Finite Lived Intangible Assets [Line Items]
Gross carrying amount	$ 23,836	$ 8,556
Accumulated amortization	(6,541)	(3,894)
Net carrying amount	$ 17,295	$ 4,662
Customer Relationships | Weighted Average
Finite Lived Intangible Assets [Line Items]
Weighted average life (years)	5 years	5 years