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Short-Term Bank Deposit (Details) - USD ($) $ in Thousands | 12 Months Ended |
--- | --- | ---
Dec. 31, 2017 | Dec. 31, 2018
Debt Disclosure [Abstract] |  |
Deposit amount | $ 40,000 |
Interest rate (%) | 2.28% |
Maturity date | Dec. 27, 2018 |

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