Significant Customer and Geographic Information - Revenues by Geographic Area (Details) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2017	Jun. 30, 2016	Jun. 30, 2017	Jun. 30, 2016
Schedule of revenues by geographical area
Total revenues	$ 10,347	$ 16,002	$ 18,317	$ 23,998
Net income (loss)	(6,280)	2,239	(13,740)	(4,735)
United States [Member]
Schedule of revenues by geographical area
Total revenues	4,366	2,408	6,097	5,102
Singapore [Member]
Schedule of revenues by geographical area
Total revenues	2,148	1,165	3,494	2,121
India
Schedule of revenues by geographical area
Total revenues	1,526	1,023	2,275	2,046
Other Asian Countries [Member]
Schedule of revenues by geographical area
Total revenues	313	269	1,193	495
United Kingdom [Member]
Schedule of revenues by geographical area
Total revenues	24	10,071	43	10,581
Switzerland [Member]
Schedule of revenues by geographical area
Total revenues	1,424	185	2,328	618
Slovenia [Member]
Schedule of revenues by geographical area
Total revenues	0	164	1,632	743
Other European Countries [Member]
Schedule of revenues by geographical area
Total revenues	511	367	1,162	542
Others [Member]
Schedule of revenues by geographical area
Total revenues	$ 35	$ 350	$ 93	$ 1,750