| Business Combination - Fair Value of Purchase Price (Details) - USD ($) $ in Thousands | Apr. 30, 2015 | Oct. 31, 2014 | 
|---|---|---|
| Entropic Communications [Member] | ||
| Business Acquisition [Line Items] | ||
| Cash | $ 111,125 | |
| Class A common stock issued | 173,781 | |
| Liabilities incurred | 4,485 | |
| Total purchase consideration | $ 289,391 | |
| Physpeed [Member] | ||
| Business Acquisition [Line Items] | ||
| Cash | $ 9,250 | |
| Liabilities incurred | 265 | |
| Total purchase consideration | $ 9,515 | 
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- Definition Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table. No definition available. 
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- Definition Amount of consideration transferred, consisting of acquisition-date fair value of assets transferred by the acquirer, liabilities incurred by the acquirer, and equity interest issued by the acquirer. Reference 1: http://www.xbrl.org/2003/role/presentationRef 
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- Definition Amount of equity interests of the acquirer, including instruments or interests issued or issuable in consideration for the business combination. Reference 1: http://www.xbrl.org/2003/role/presentationRef 
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- Definition Amount of liabilities incurred by the acquirer as part of consideration transferred in a business combination. Reference 1: http://www.xbrl.org/2003/role/presentationRef 
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- Definition The cash outflow associated with the acquisition of business during the period. The cash portion only of the acquisition price. Reference 1: http://www.xbrl.org/2003/role/presentationRef 
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