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Consolidated Statements of Comprehensive Income (Loss) (Parenthetical) - USD ($)
12 Months Ended
Dec. 31, 2015
Dec. 31, 2014
Dec. 31, 2013
Statement of Comprehensive Income [Abstract]      
Foreign currency translation gains (losses), tax provision (benefit) $ 0 $ 0 $ (378,000)
Recognized income tax provision (benefit) $ 0 $ 0 $ 0