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Other Income (Expense), Net (Tables) | 12 Months Ended
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Dec. 31, 2019
Other Income and Expenses [Abstract] |
Components of Other Income | 15. OTHER INCOME (EXPENSE), NET The major changes in the components of Other income (expense), net for the years ended December 31 were as follows (in thousands):
|  | 2019 |  |  | 2018 |  |  | 2017 |
Rental income |  | $ | 792 |  |  | $ | 792 |  |  | $ | 792 |
Interest income |  |  | 300 |  |  |  | 257 |  |  |  | 124 |
Foreign currency losses, net |  |  | (108 | ) |  |  | (260 | ) |  |  | 323 |
Gain on disposal of equipment |  |  | 38 |  |  |  | 57 |  |  |  | 14 |
Credit gains on available-for-sale securities |  |  | 4 |  |  |  | 7 |  |  |  | 11 |
Other |  |  | 40 |  |  |  | 21 |  |  |  | (2 | )
|  | $ | 1,066 |  |  | $ | 874 |  |  | $ | 1,262 |

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