Significant Customer and Geographic Information - Revenues (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2016	Dec. 31, 2015	Dec. 31, 2014
Schedule of revenues by geographical area
Revenues	$ 48,837	$ 41,804	$ 35,307
United States
Schedule of revenues by geographical area
Revenues	21,309	24,795	16,136
Europe
Schedule of revenues by geographical area
Revenues	17,138	14,151	15,067
India
Schedule of revenues by geographical area
Revenues	3,578	1,026	919
Singapore
Schedule of revenues by geographical area
Revenues	3,836	963	1,435
Other Asian Countries
Schedule of revenues by geographical area
Revenues	1,159	864	1,637
Others
Schedule of revenues by geographical area
Revenues	$ 1,817	$ 5	$ 113