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Segment Reporting and Significant Customer Information - Assets by Segment (Details) - USD ($)
$ in Thousands
Jun. 30, 2015
Dec. 31, 2014
Revenue for each segment recognized based on customer location    
Long-lived assets $ 8,468 $ 9,185
Total assets 90,985 90,488
Operating Segments | North America    
Revenue for each segment recognized based on customer location    
Long-lived assets 7,281 7,678
Total assets 75,381 73,508
Operating Segments | Europe    
Revenue for each segment recognized based on customer location    
Long-lived assets 1,187 1,507
Total assets 40,007 40,818
Elimination    
Revenue for each segment recognized based on customer location    
Long-lived assets 0 0
Total assets $ (24,403) $ (23,838)