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Fair Value Information (Tables) | 12 Months Ended
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Dec. 31, 2017
Not measured at fair value [Member] |
Disclosure of fair value measurement of assets and liabilities [Line Items] |
Carrying Amounts And Fair Value of Financial Assets and Liabilities | Except for what disclosed in the following table, the Company considers that the carrying amounts of financial assets and liabilities not measured at fair value approximate their fair values or the fair values cannot be reliable estimated: December 31, 2016
|  | Carrying |  |  | Fair Value |
|  | Amount |  |  | Level 1 |  |  | Level 2 |  |  | Level 3 |
Held-to-maturity financial assets |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Corporate bonds |  | $ | 1,990 |  |  | $ | — |  |  | $ | 1,996 |  |  | $ | — |
Bank debentures |  |  | 150 |  |  |  | — |  |  |  | 150 |  |  |  | — |
|  | $ | 2,140 |  |  | $ | — |  |  | $ | 2,146 |  |  | $ | — |
The Level 2 fair values are estimated using discounted cash flow models. The models use market-based observable inputs including duration, yield rate and credit rating.
Fair value on a recurring basis [Member] |
Disclosure of fair value measurement of assets and liabilities [Line Items] |
Carrying Amounts And Fair Value of Financial Assets and Liabilities |
| b. | Financial instruments that are measured at fair value on a recurring basis
December 31, 2016
|  | Level 1 |  |  | Level 2 |  |  | Level 3 |  |  | Total |
Financial assets at FVTPL |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Derivative |  | $ | — |  |  | $ | — |  |  | $ | — |  |  | $ | — |
Available-for-sale financial assets |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Listed securities |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Equity investments |  | $ | 2,521 |  |  | $ | — |  |  | $ | — |  |  | $ | 2,521 |
Financial liabilities at FVTPL |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Derivative |  | $ | — |  |  | $ | 1 |  |  | $ | — |  |  | $ | 1 |
Hedging derivative financial liabilities |  | $ | — |  |  | $ | 1 |  |  | $ | — |  |  | $ | 1 |
December 31, 2017
|  | Level 1 |  |  | Level 2 |  |  | Level 3 |  |  | Total |
Available-for-sale financial assets |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Listed securities |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Equity investments |  | $ | 3,125 |  |  | $ | — |  |  | $ | — |  |  | $ | 3,125 |
Financial liabilities at FVTPL |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Derivative |  | $ | — |  |  | $ | 1 |  |  | $ | — |  |  | $ | 1 |
Hedging derivative financial liabilities |  | $ | — |  |  | $ | 1 |  |  | $ | — |  |  | $ | 1 |

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