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Document and Entity Information
 3 Months Ended
Mar. 31, 2015
May 01, 2015
Document And Entity Information [Abstract]    
Document Type 10-Q  
Amendment Flag false  
Document Period End Date Mar. 31, 2015  
Document Fiscal Year Focus 2015  
Document Fiscal Period Focus Q1  
Trading Symbol GLYC  
Entity Registrant Name GLYCOMIMETICS INC  
Entity Central Index Key 0001253689  
Current Fiscal Year End Date --12-31  
Entity Filer Category Non-accelerated Filer  
Entity Common Stock, Shares Outstanding   19,007,133dei_EntityCommonStockSharesOutstanding