Segment Disclosure (Details 1) - USD ($) $ in Thousands	3 Months Ended								12 Months Ended
	Dec. 31, 2017	Sep. 30, 2017	Jun. 30, 2017	Mar. 31, 2017	Dec. 31, 2016	Sep. 30, 2016	Jun. 30, 2016	Mar. 31, 2016	Dec. 31, 2017		Dec. 31, 2016
Revenue Information by Geography [Abstract]
Revenue	$ 8,030	$ 7,817	$ 8,021	$ 7,799	$ 7,498	$ 8,179	$ 8,061	$ 8,647	$ 31,667	[1]	$ 32,385	[1]
United States [Member]
Revenue Information by Geography [Abstract]
Revenue									12,395		10,309
Other Americas [Member]
Revenue Information by Geography [Abstract]
Revenue									921		1,093
Total Americas [Member]
Revenue Information by Geography [Abstract]
Revenue									13,316		11,402
Germany [Member]
Revenue Information by Geography [Abstract]
Revenue									8,034		8,749
Other EMEA [Member]
Revenue Information by Geography [Abstract]
Revenue									2,731		5,366
Total EMEA [Member]
Revenue Information by Geography [Abstract]
Revenue									10,765		14,115
China [Member]
Revenue Information by Geography [Abstract]
Revenue									2,443		2,209
Other APJ [Member]
Revenue Information by Geography [Abstract]
Revenue									5,143		4,659
Total APJ [Member]
Revenue Information by Geography [Abstract]
Revenue									$ 7,586		$ 6,868

[1] Includes related party amounts of $0 and $1,313 in 2017 and 2016, respectively. See Note 13 for additional information on related party transactions.