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Condensed Consolidated Statements of Comprehensive Income (Loss) - USD ($)
$ in Thousands
 3 Months Ended
Mar. 31, 2016
Mar. 31, 2015
Statement Of Income And Comprehensive Income [Abstract]    
Net income (loss) before dividends on redeemable convertible preferred stock $ (2,883) $ 274
Other comprehensive income:    
Foreign currency translation gain (loss), net of deferred income taxes 99 (147)
Total comprehensive income (loss) $ (2,784) $ 127