Balance Sheet Information - Intangible Assets, Net (Details) - USD ($) $ in Thousands	Sep. 30, 2019	Dec. 31, 2018
Indefinite-lived Intangible Assets [Line Items]
Gross Carrying Amount	$ 55,673	$ 40,920
Accumulated Amortization	(6,347)	(1,262)
Foreign Currency Translation Adjustments	(2,177)	(394)
Intangible Assets, Net	47,149	39,264
Developed technology
Indefinite-lived Intangible Assets [Line Items]
Gross Carrying Amount	26,829	20,720
Accumulated Amortization	(3,802)	(859)
Foreign Currency Translation Adjustments	(1,073)	(201)
Intangible Assets, Net	21,954	19,660
Consumer relationships
Indefinite-lived Intangible Assets [Line Items]
Gross Carrying Amount	25,300	16,800
Accumulated Amortization	(1,833)	(233)
Foreign Currency Translation Adjustments	(930)	(160)
Intangible Assets, Net	22,537	16,407
Trade names
Indefinite-lived Intangible Assets [Line Items]
Gross Carrying Amount	3,544	3,400
Accumulated Amortization	(712)	(170)
Foreign Currency Translation Adjustments	(174)	(33)
Intangible Assets, Net	$ 2,658	$ 3,197