v3.10.0.1
Document and Entity Information
12 Months Ended
Dec. 31, 2017
shares
Document Information [Line Items]  
Document Type 20-F
Amendment Flag false
Document Period End Date Dec. 31, 2017
Document Fiscal Year Focus 2017
Document Fiscal Period Focus FY
Trading Symbol GSUM
Entity Registrant Name Gridsum Holding Inc.
Entity Central Index Key 0001647338
Current Fiscal Year End Date --12-31
Entity Well-known Seasoned Issuer No
Entity Current Reporting Status Yes
Entity Filer Category Accelerated Filer
Class A Ordinary Shares  
Document Information [Line Items]  
Entity Common Stock, Shares Outstanding 4,543,461
Class B Ordinary Shares  
Document Information [Line Items]  
Entity Common Stock, Shares Outstanding 26,280,367