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Condensed Consolidated Statements of Comprehensive Income (Loss) - USD ($)
$ in Thousands
 3 Months Ended 6 Months Ended
Jun. 30, 2015
Jun. 30, 2014
Jun. 30, 2015
Jun. 30, 2014
Statement Of Income And Comprehensive Income [Abstract]        
Net income (loss) before dividends on redeemable convertible preferred stock $ 547 $ (1,322) $ 821 $ (742)
Other comprehensive income:        
Foreign currency translation gain (loss), net of deferred income taxes 52 (99) (95) (1)
Total comprehensive income (loss) $ 599 $ (1,421) $ 726 $ (743)