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Financial Income (Expenses), Net (Tables) | 12 Months Ended
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Dec. 31, 2018
Other Income and Expenses [Abstract] |
Financial Income (Expenses), Net |
|  | Year ended December 31 |
|  | 2016 |  |  | 2017 |  |  | 2018 |
|  | US$ thousands |
Interest income |  |  | 751 |  |  |  | 527 |  |  |  | 840 |
Discount on marketable securities, net |  |  | (358 | ) |  |  | (217 | ) |  |  | (32 | )
Exchange rate differences, net |  |  | (236 | ) |  |  | (45 | ) |  |  | 208 |
Bank charges |  |  | (122 | ) |  |  | (109 | ) |  |  | (93 | )
|  |  | 35 |  |  |  | 156 |  |  |  | 923 |

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