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Other Income (Expense), Net (Tables) | 12 Months Ended
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Dec. 31, 2018
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):
|  | 2018 |  |  | 2017 |  |  | 2016 |
Rental income |  | $ | 792 |  |  | $ | 792 |  |  | $ | 462 |
Foreign currency (losses) gains, net |  |  | (260 | ) |  |  | 323 |  |  |  | (268 | )
Interest income |  |  | 257 |  |  |  | 124 |  |  |  | 68 |
Gain (loss) on disposal of equipment |  |  | 57 |  |  |  | 14 |  |  |  | (4 | )
Credit gains on available-for-sale securities |  |  | 7 |  |  |  | 11 |  |  |  | 13 |
Other |  |  | 21 |  |  |  | (2 | ) |  |  | 13 |
|  | $ | 874 |  |  | $ | 1,262 |  |  | $ | 284 |

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