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Short-Term Investments (Tables) | 12 Months Ended
--- | ---
Dec. 31, 2016
Short Term Investments |
|  | December 31 |
|  | 2015 |  |  | 2016 |
|  | US$ |  |  | US$ |
Trading securities |  |  | 681 |  |  |  | 3,302 |
Held-to-maturity investments |  |  | 4,000 |  |  |  | — |
|  |  | 4,681 |  |  |  | 3,302 |

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- Definition Disclosure of short term investments + References No definition available. + Details
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Namespace Prefix: | simo_
Data Type: | nonnum:textBlockItemType
Balance Type: | na
Period Type: | duration