Goodwill and Intangible Assets, Net - Schedule of Intangible Assets (Details) - USD ($) $ in Thousands	9 Months Ended	12 Months Ended
	Sep. 30, 2019	Dec. 31, 2018
Finite Lived Intangible Assets [Line Items]
Gross carrying amount	$ 84,247	$ 35,513
Accumulated amortization	(13,623)	(12,316)
Net carrying amount	70,624	23,197
Developed Technology
Finite Lived Intangible Assets [Line Items]
Gross carrying amount	9,436	5,090
Accumulated amortization	(3,412)	(3,225)
Net carrying amount	$ 6,024	$ 1,865
Developed Technology | Weighted-Average
Finite Lived Intangible Assets [Line Items]
Weighted average life (years)	3 years	3 years 14 days
Tradenames
Finite Lived Intangible Assets [Line Items]
Gross carrying amount	$ 11,452	$ 3,193
Accumulated amortization	(1,940)	(1,526)
Net carrying amount	$ 9,512	$ 1,667
Tradenames | Weighted-Average
Finite Lived Intangible Assets [Line Items]
Weighted average life (years)	3 years 5 months 23 days	4 years 6 months 3 days
Non-compete
Finite Lived Intangible Assets [Line Items]
Gross carrying amount	$ 240	$ 240
Accumulated amortization	$ (240)	(230)
Net carrying amount		$ 10
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	$ 63,119	$ 26,990
Accumulated amortization	(8,031)	(7,335)
Net carrying amount	$ 55,088	$ 19,655
Customer Relationships | Weighted-Average
Finite Lived Intangible Assets [Line Items]
Weighted average life (years)	6 years 10 months 2 days	6 years 4 months 20 days