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Short-Term Investments | 12 Months Ended
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Dec. 31, 2016
Short-Term Investments | 5. SHORT-TERM INVESTMENTS
|  | December 31 |
|  | 2015 |  |  | 2016 |
|  | US$ |  |  | US$ |
Trading securities |  |  | 681 |  |  |  | 3,302 |
Held-to-maturity investments |  |  | 4,000 |  |  |  | — |
|  |  | 4,681 |  |  |  | 3,302 |
The Company classified certain short-term investments as trading securities and held-to-maturity investments. Realized gains on sales of these trading securities were US$4 thousand, US$3 thousand and US$2 thousand for the years ended December 31, 2014, 2015 and 2016, respectively. The amount of unrealized losses related to trading securities at year end was nil for the years ended December 31, 2014, 2015 and 2016, respectively.

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