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Acquisitions (Details) - USD ($)
$ in Thousands
 1 Months Ended
Oct. 28, 2015
Dec. 10, 2014
Apr. 15, 2016
Dec. 31, 2020
Dec. 31, 2019
Dec. 31, 2015
Business Acquisition [Line Items]            
Purchase price allocated to goodwill       $ 25,561 $ 25,561  
Silicom Denmark [Member]            
Business Acquisition [Line Items]            
Aggregate purchase price in cash   $ 10,161        
Contingent consideration   $ 4,683        
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%
Aggregate options granted     22,795      
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