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Preferred Stock and Stockholders' Equity - Convertible Preferred Stock Warrants (Details)
1 Months Ended
Jul. 31, 2010
Nov. 29, 2010
Oxford [Member] | Series B Preferred Stock [Member]    
Class of Stock [Line Items]    
Conversion of convertible preferred stock to common stock at initial public offering, shares 1,145,455us-gaap_ConversionOfStockSharesIssued1
/ dei_LegalEntityAxis
= zgnx_OxfordFinanceCorporationMember
/ us-gaap_StatementClassOfStockAxis
= us-gaap_SeriesBPreferredStockMember
 
Silicon Valley Bank [Member] | Series B Preferred Stock [Member]    
Class of Stock [Line Items]    
Conversion of convertible preferred stock to common stock at initial public offering, shares 445,455us-gaap_ConversionOfStockSharesIssued1
/ dei_LegalEntityAxis
= zgnx_SiliconValleyBankMember
/ us-gaap_StatementClassOfStockAxis
= us-gaap_SeriesBPreferredStockMember
 
Oxford/SVB [Member] | Series B Preferred Stock [Member]    
Class of Stock [Line Items]    
Exercise price 1.10us-gaap_ClassOfWarrantOrRightExercisePriceOfWarrantsOrRights
/ dei_LegalEntityAxis
= zgnx_OxfordFinanceCorporationAndSiliconValleyBankMember
/ us-gaap_StatementClassOfStockAxis
= us-gaap_SeriesBPreferredStockMember
 
Oxford/SVB [Member] | Common Stock [Member]    
Class of Stock [Line Items]    
Exercise price   11.00us-gaap_ClassOfWarrantOrRightExercisePriceOfWarrantsOrRights
/ dei_LegalEntityAxis
= zgnx_OxfordFinanceCorporationAndSiliconValleyBankMember
/ us-gaap_StatementClassOfStockAxis
= us-gaap_CommonStockMember
Sale of warrants to purchase common stock   159,090us-gaap_ClassOfWarrantOrRightNumberOfSecuritiesCalledByWarrantsOrRights
/ dei_LegalEntityAxis
= zgnx_OxfordFinanceCorporationAndSiliconValleyBankMember
/ us-gaap_StatementClassOfStockAxis
= us-gaap_CommonStockMember