Goodwill and Intangible Assets, Net - Carrying Value of Intangible Assets (Details) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2019	Sep. 30, 2018	Sep. 30, 2019	Sep. 30, 2018	Sep. 30, 2017	Dec. 31, 2018
Schedule of Goodwill and Intangible Assets [Line Items]
Cost	$ 27,743		$ 27,743			$ 26,843
Accumulated Amortization	(9,467)		(9,467)			(4,907)
Net Book Value	18,276		18,276			21,936
Intangible assets not subject to amortization	40		40			40
Total intangible assets, net	18,316		18,316			21,976
Amortization of intangible assets	1,500	$ 900	4,600	$ 2,400
Goodwill	7,447		$ 7,447			7,225
Developed technology
Schedule of Goodwill and Intangible Assets [Line Items]
Weighted Average Life (Years)			5 years
Weighted Average Remaining Life (Years)			3 years		3 years 9 months 18 days
Cost	26,356		$ 26,356			25,456
Accumulated Amortization	(8,570)		(8,570)			(4,085)
Net Book Value	17,786		$ 17,786			21,371
Patent licenses
Schedule of Goodwill and Intangible Assets [Line Items]
Weighted Average Life (Years)			14 years
Weighted Average Remaining Life (Years)			4 years 10 months 24 days		5 years 10 months 24 days
Cost	1,387		$ 1,387			1,387
Accumulated Amortization	(897)		(897)			(822)
Net Book Value	$ 490		$ 490			$ 565