Segment, Geographical and Other Revenue Information - Revenues by Geographic Area (Details) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2018	Mar. 31, 2017
Schedule of revenues by geographical area
Total revenues	$ 14,042	$ 7,971
Americas [Member]
Schedule of revenues by geographical area
Total revenues	3,597	1,788
EMEA [Member]
Schedule of revenues by geographical area
Total revenues	4,992	3,208
APAC [Member]
Schedule of revenues by geographical area
Total revenues	$ 5,453	$ 2,975