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Segment and Related Information (Details 1) - USD ($)
$ in Thousands
3 Months Ended 12 Months Ended
Dec. 31, 2016
Sep. 30, 2016
Jun. 30, 2016
Mar. 31, 2016
Dec. 31, 2015
Sep. 30, 2015
Jun. 30, 2015
Mar. 31, 2015
Dec. 31, 2016
Dec. 31, 2015
Dec. 31, 2014
Segment Reporting Information [Line Items]                      
Revenues $ 26,415 $ 25,007 $ 26,136 $ 26,963 $ 28,370 $ 25,731 $ 28,800 $ 25,763 $ 104,521 $ 108,664 $ 108,663
Net Assets 72,196       77,598       72,196 77,598  
Long-lived assets, net 21,767       26,774       21,767 26,774  
Segment, Geographical, United States [Member]                      
Segment Reporting Information [Line Items]                      
Revenues                 65,179 64,766 63,727
Net Assets 25,736       22,312       25,736 22,312  
Long-lived assets, net 12,004       13,610       12,004 13,610  
Segment, Geographical, Germany [Member]                      
Segment Reporting Information [Line Items]                      
Revenues                 13,477 15,755 8,240
Net Assets 15,026       18,512       15,026 18,512  
Long-lived assets, net 5,504       7,817       5,504 7,817  
Segment, Geographical, United Kingdom [Member]                      
Segment Reporting Information [Line Items]                      
Revenues                 16,421 18,051 24,754
Net Assets 16,083       17,908       16,083 17,908  
Long-lived assets, net 918       1,440       918 1,440  
Rest Of The World [Member]                      
Segment Reporting Information [Line Items]                      
Revenues                 9,444 10,092 11,942
Net Assets 15,351       18,866       15,351 18,866  
Long-lived assets, net 3,341       3,907       3,341 3,907  
Total [Member]                      
Segment Reporting Information [Line Items]                      
Revenues                 104,521 108,664 $ 108,663
Net Assets 72,196       77,598       72,196 77,598  
Long-lived assets, net $ 21,767       $ 26,774       $ 21,767 $ 26,774