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Long-Term Investments (Tables) | 12 Months Ended
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Dec. 31, 2016
Long-Term Investments | As of December 31, 2015 and 2016, the Company held equity investments in several privately-held companies with the carrying value as follows:
|  | Percentage of Ownership |  |  | December 31 |
|  | 2015 |  |  | 2016 |  |  | 2015 |  |  | 2016 |
|  |  |  |  |  |  |  | US$ |  |  | US$ |
Cost method: |  |  |  |  |  |  |  |  |  |  |  |
Cashido Corp. (Cashido) |  |  | 2.1 | % |  |  | 2.1 | % |  |  | 104 |  |  |  | 91 |
Vastview Technology, Corp. (Vastview) |  |  | 2.9 | % |  |  | 2.9 | % |  |  | 29 |  |  |  | 29 |
|  |  |  |  |  |  |  |  |  |  | 133 |  |  |  | 120 |

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- Definition Schedule Of Long Term Investments Table Text Block + References No definition available. + Details
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Namespace Prefix: | simo_
Data Type: | nonnum:textBlockItemType
Balance Type: | na
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