XML 20 R1.htm IDEA: XBRL DOCUMENT v3.8.0.1
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 CMCM
Entity Registrant Name Cheetah Mobile Inc.
Entity Central Index Key 0001597835
Current Fiscal Year End Date --12-31
Entity Well-known Seasoned Issuer No
Entity Current Reporting Status Yes
Entity Filer Category Accelerated Filer
Common Class A [Member]  
Document Information [Line Items]  
Entity Common Stock, Shares Outstanding 415,250,897
Common Class B [Member]  
Document Information [Line Items]  
Entity Common Stock, Shares Outstanding 1,006,398,742