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Consolidated Statements of Operations (Parenthetical) (USD $)
In Thousands, unless otherwise specified
12 Months Ended
Dec. 31, 2013
Dec. 31, 2012
Dec. 31, 2011
Consolidated Statements of Operations      
Amortization of intangible assets $ 743 $ 0 $ 0
Revenue from a related party $ 3,330 $ 5,613 $ 9,658