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Segment Reporting and Significant Customer Information - Assets by Segment (Details) (USD $) In Thousands, unless otherwise specified	Mar. 31, 2014	Dec. 31, 2013
Revenue for each segment recognized based on customer location
Long-lived assets	$ 10,654	$ 8,649
Total assets	97,243	114,802
Operating Segments [Member] \| North America [Member]
Revenue for each segment recognized based on customer location
Long-lived assets	8,692	6,572
Total assets	77,470	96,278
Operating Segments [Member] \| Europe [Member]
Revenue for each segment recognized based on customer location
Long-lived assets	1,962	2,077
Total assets	51,012	49,668
Elimination
Revenue for each segment recognized based on customer location
Long-lived assets	0	0
Total assets	$ (31,239)	$ (31,144)