CONSOLIDATED STATEMENTS OF COMPREHENSIVE LOSS (Parenthetical) U_pure in Thousands	12 Months Ended
Dec. 31, 2023	Dec. 31, 2022	Dec. 31, 2021
Conversion ratio, ADS to Class A ordinary share	50	50	50

Conversion ratio of American Depositary Share (ADS) to Class A ordinary share.

No definition available.

Name:	cmcm_SharesConversionRatio
Namespace Prefix:	cmcm_
Data Type:	xbrli:pureItemType
Balance Type:	na
Period Type:	duration