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Other Income (Expense), Net (Tables) | 12 Months Ended
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Dec. 31, 2017
Other Income and Expenses [Abstract] |
Components of Other Income | The major changes in the components of Other income (expense), net for the years ended December 31 were as follows (in thousands):
|  | 2017 |  |  | 2016 |  |  | 2015 |
Rental income |  | $ | 792 |  |  | $ | 462 |  |  | $ | — |
Foreign currency gains (losses), net |  |  | 323 |  |  |  | (268 | ) |  |  | (161 | )
Interest income |  |  | 124 |  |  |  | 68 |  |  |  | 47 |
Gain (loss) on disposal of equipment |  |  | 14 |  |  |  | (4 | ) |  |  | 60 |
Credit gains on available-for-sale securities |  |  | 11 |  |  |  | 13 |  |  |  | 12 |
Other |  |  | (2 | ) |  |  | 13 |  |  |  | 67 |
|  | $ | 1,262 |  |  | $ | 284 |  |  | $ | 25 |

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- Definition Tabular disclosure of interest income and income classified as other. + References No definition available. + Details
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