Geographic Information and Major Customer and Product Data - Revenues Within Geographical Areas (Details) - USD ($) $ in Thousands		3 Months Ended		9 Months Ended
		Sep. 30, 2018	Sep. 30, 2017	Sep. 30, 2018	Sep. 30, 2017
Segment Reporting Information [Line Items]
Revenues		$ 67,052	$ 53,365	$ 182,770	$ 142,389
North America
Segment Reporting Information [Line Items]
Revenues		44,890	35,307	114,951	95,172
EMEA
Segment Reporting Information [Line Items]
Revenues	[1]	19,778	16,449	61,606	42,550
Rest of World
Segment Reporting Information [Line Items]
Revenues		$ 2,384	$ 1,609	$ 6,213	$ 4,667

[1] Sales to customers in France accounted for $19,813 of the Company’s revenues for the nine months ended September 30, 2018 and did not exceed 10% of total revenues for the nine months ended September 30, 2017. Sales to customers in the UK accounted for $18,708 of the Company’s revenues for the nine months ended September 30, 2018 and did not exceed 10% of total revenues for the nine months ended September 30, 2017.