XML 54 R35.htm IDEA: XBRL DOCUMENT
v3.8.0.1

Summary of Significant Accounting Policies (Tables) | 12 Months Ended
--- | ---
Dec. 31, 2017
Schedule of estimated useful lives of property and equipment |
|  | Estimated useful life |
Electronic equipment |  |  | 2-3 years |
Office equipment and fixtures |  |  | 5 years |
Motor vehicles |  |  | 4 years |
Leasehold improvements |  |  | Lesser of term of the lease or the estimated useful lives of the assets |
Schedule of estimated useful lives of intangible assets |
|  | Estimated useful life |
Customer relationship |  |  | 2-6 years |
Trademarks |  |  | 3-10 years |
Technology |  |  | 1-10 years |
Online game licenses |  |  | 1-5 years |
User base |  |  | 1-3 years |
Domain names |  |  | 1-10 years |
Platform |  |  | 5 years |

X
- Definition Tabular disclosure of the useful life of assets lacking physical substance. + References No definition available. + Details
Name: | cmcm_ScheduleOfIntangibleAssetsUsefulLifeTableTextBlock
Namespace Prefix: | cmcm_
Data Type: | nonnum:textBlockItemType
Balance Type: | na
Period Type: | duration

X
- Definition Tabular disclosure of the useful life of long-lived, physical assets that are used in the normal conduct of business to produce goods and services and not intended for resale. + References No definition available. + Details
Name: | cmcm_ScheduleOfPropertyPlantAndEquipmentUsefulLifeTableTextBlock
Namespace Prefix: | cmcm_
Data Type: | nonnum:textBlockItemType
Balance Type: | na
Period Type: | duration