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Noncurrent Assets Held for Sale (Tables) | 12 Months Ended
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Dec. 31, 2016
Summary of Noncurrent Assets Held for Sale |
|  | December 31 |
|  | 2015 |  |  | 2016 |
|  | US$ |  |  | US$ |
Assets held for sale |  |  | — |  |  |  | 3,363 |
|  |  | — |  |  |  | 3,363 |

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- Definition Summary of non current assets held for sale. + References No definition available. + Details
Name: | simo_SummaryOfNonCurrentAssetsHeldForSaleTableTextBlock
Namespace Prefix: | simo_
Data Type: | nonnum:textBlockItemType
Balance Type: | na
Period Type: | duration