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Stockholders' Equity - Common Stock Warrants (Detail) (Common Stock [Member], USD $)
3 Months Ended
Mar. 31, 2015
Oct. 13, 2006
Class of Warrant or Right [Line Items]    
Exercise price per share   $ 25.92us-gaap_ClassOfWarrantOrRightExercisePriceOfWarrantsOrRights1
July 18, 2018 [Member]    
Class of Warrant or Right [Line Items]    
Common stock warrants 259,907us-gaap_ClassOfWarrantOrRightOutstanding
/ us-gaap_ClassOfWarrantOrRightAxis
= glyc_EighteenJulyTwoThousandEighteenMember
/ us-gaap_StatementEquityComponentsAxis
= us-gaap_CommonStockMember
 
Exercise price per share $ 0.33us-gaap_ClassOfWarrantOrRightExercisePriceOfWarrantsOrRights1
/ us-gaap_ClassOfWarrantOrRightAxis
= glyc_EighteenJulyTwoThousandEighteenMember
/ us-gaap_StatementEquityComponentsAxis
= us-gaap_CommonStockMember
 
Expiration date Jul. 18, 2018  
January 16, 2019 [Member]    
Class of Warrant or Right [Line Items]    
Common stock warrants 301,986us-gaap_ClassOfWarrantOrRightOutstanding
/ us-gaap_ClassOfWarrantOrRightAxis
= glyc_SixteenJanuaryTwoThousandNineteenMember
/ us-gaap_StatementEquityComponentsAxis
= us-gaap_CommonStockMember
 
Exercise price per share $ 0.33us-gaap_ClassOfWarrantOrRightExercisePriceOfWarrantsOrRights1
/ us-gaap_ClassOfWarrantOrRightAxis
= glyc_SixteenJanuaryTwoThousandNineteenMember
/ us-gaap_StatementEquityComponentsAxis
= us-gaap_CommonStockMember
 
Expiration date Jan. 16, 2019  
December 9, 2015 [Member]    
Class of Warrant or Right [Line Items]    
Common stock warrants 11,908us-gaap_ClassOfWarrantOrRightOutstanding
/ us-gaap_ClassOfWarrantOrRightAxis
= glyc_NineDecemberTwoThousandFifteenMember
/ us-gaap_StatementEquityComponentsAxis
= us-gaap_CommonStockMember
 
Exercise price per share $ 0.33us-gaap_ClassOfWarrantOrRightExercisePriceOfWarrantsOrRights1
/ us-gaap_ClassOfWarrantOrRightAxis
= glyc_NineDecemberTwoThousandFifteenMember
/ us-gaap_StatementEquityComponentsAxis
= us-gaap_CommonStockMember
 
Expiration date Dec. 09, 2015  
January 30, 2019 [Member]    
Class of Warrant or Right [Line Items]    
Common stock warrants 15,250us-gaap_ClassOfWarrantOrRightOutstanding
/ us-gaap_ClassOfWarrantOrRightAxis
= glyc_ThirtyJanuaryTwoThousandNineteenMember
/ us-gaap_StatementEquityComponentsAxis
= us-gaap_CommonStockMember
 
Exercise price per share $ 0.33us-gaap_ClassOfWarrantOrRightExercisePriceOfWarrantsOrRights1
/ us-gaap_ClassOfWarrantOrRightAxis
= glyc_ThirtyJanuaryTwoThousandNineteenMember
/ us-gaap_StatementEquityComponentsAxis
= us-gaap_CommonStockMember
 
Expiration date Jan. 30, 2019  
October 13, 2016 [Member]    
Class of Warrant or Right [Line Items]    
Common stock warrants 1,544us-gaap_ClassOfWarrantOrRightOutstanding
/ us-gaap_ClassOfWarrantOrRightAxis
= glyc_ThirteenOctoberTwoThousandSixteenMember
/ us-gaap_StatementEquityComponentsAxis
= us-gaap_CommonStockMember
 
Exercise price per share $ 25.92us-gaap_ClassOfWarrantOrRightExercisePriceOfWarrantsOrRights1
/ us-gaap_ClassOfWarrantOrRightAxis
= glyc_ThirteenOctoberTwoThousandSixteenMember
/ us-gaap_StatementEquityComponentsAxis
= us-gaap_CommonStockMember
 
Expiration date Oct. 13, 2016