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Acquisitions (Details) - USD ($) $ in Thousands | Oct. 28, 2015 | Dec. 10, 2014 | Dec. 31, 2018 | Dec. 31, 2017 | Dec. 31, 2016 | Dec. 31, 2015
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Business Acquisition [Line Items] |  |  |  |  |  |
Purchase price allocated to goodwill |  |  | $ 25,561 | $ 25,561 |  |
ADI Engineering, Inc. [Member] |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |
Aggregate purchase price in cash | $ 10,000 |  |  |  |  |
Contingent consideration | 7,802 |  |  |  |  |
Total purchase price | 17,802 |  |  |  |  |
Purchase price allocated to tangible assets | 222 |  |  |  |  |
Purchase price allocated to intangibles assets | 4,261 |  |  |  |  |
Purchase price allocated to goodwill | $ 13,319 |  |  |  |  |
Total obligation the company paid |  |  |  |  | $ 3,000 |
Silicom Denmark [Member] |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |
Aggregate purchase price in cash |  | $ 10,161 |  |  |  |
Contingent consideration |  | 4,683 |  |  |  |
Total purchase price |  | 14,844 |  |  |  |
Purchase price allocated to tangible assets |  | 2,022 |  |  |  |
Purchase price allocated to intangibles assets |  | 1,996 |  |  |  |
Purchase price allocated to goodwill |  | 12,242 |  |  |  |
Purchase price allocated to liabilities assumed |  | $ 1,416 |  |  |  |
Total obligation the company paid |  |  |  |  |  | $ 1,463
Percentage of contingent consideration paid in cash |  |  |  |  |  | 90.00%
Percentage of contingent consideration paid in options to ordinary shares |  |  |  |  |  | 10.00%

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