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Acquisition of Brabant - Pro Forma Information (Details) (USD $)
In Thousands, except Per Share data, unless otherwise specified
12 Months Ended
Dec. 31, 2014
Dec. 31, 2013
Business Combinations [Abstract]    
Business Acquisition, Pro Forma Revenue $ 40,531us-gaap_BusinessAcquisitionsProFormaRevenue $ 33,012us-gaap_BusinessAcquisitionsProFormaRevenue
Business Acquisition, Pro Forma Net Income (Loss) $ 7,873us-gaap_BusinessAcquisitionsProFormaNetIncomeLoss $ (81,882)us-gaap_BusinessAcquisitionsProFormaNetIncomeLoss
Business Acquisition, Pro Forma Earnings Per Share, Basic and Diluted $ 0.06zgnx_BusinessAcquisitionProFormaEarningsPerShareBasicandDiluted $ (0.68)zgnx_BusinessAcquisitionProFormaEarningsPerShareBasicandDiluted