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Balance Sheet Accounts (Narratives) (Details) (USD $) | 3 Months Ended |  |  | 0 Months Ended | 3 Months Ended | 0 Months Ended | 3 Months Ended
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Sep. 30, 2014 Investment_Securities | Sep. 30, 2013 | Dec. 31, 2013 | Dec. 31, 2012 | Oct. 31, 2013 Revolving Facility | Sep. 30, 2014 Revolving Facility | Oct. 31, 2013 Term Loan | Oct. 31, 2013 Enterasys Networks, Inc. Revolving Facility | Sep. 30, 2014 Minimum | Sep. 30, 2014 Minimum Net Revenue Customer Concentration Risk | Sep. 30, 2014 Maximum | Sep. 30, 2014 Cash equivalents Maximum | Sep. 30, 2014 Short-term Investments Minimum | Sep. 30, 2014 Short-term Investments Maximum | Sep. 30, 2014 Marketable Securities Minimum
Balance Sheet Accounts [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Maturity period for investments |  |  |  |  |  |  |  |  |  |  |  | 3 months | 3 months | 1 year | 1 year
Number of securities with unrealized losses | 4 |  |  |  |  |  |  |  |  |  |  |  |  |  |
Number of investment securities | 18 |  |  |  |  |  |  |  |  |  |  |  |  |  |
Extended warranty period |  |  |  |  |  |  |  |  | 1 year |  | 5 years |  |  |  |
Borrowing capacity |  |  |  |  | $ 60,000,000 |  | $ 65,000,000 |  |  |  |  |  |  |  |
Term of agreement |  |  |  |  | 5 years |  | 5 years |  |  |  |  |  |  |  |
Borrowings under Revolving Facility | 24,000,000 | 0 |  |  |  | 24,000,000 |  | 35,000,000 |  |  |  |  |  |  |
Repayments under Revolving Facility |  |  |  |  |  | 24,000,000 |  |  |  |  |  |  |  |  |
Warranty liability | $ 7,889,000 | $ 3,440,000 | $ 7,551,000 | $ 3,296,000 |  |  |  |  |  |  |  |  |  |  |
Standard hardware warranty period | 12 months |  |  |  |  |  |  |  |  |  |  |  |  |  |
Standard software warranty period | 90 days |  |  |  |  |  |  |  |  |  |  |  |  |  |
Limited lifetime hardware warranty maximum period after end of sale of product | 5 years |  |  |  |  |  |  |  |  |  |  |  |  |  |
Maximum investment in one obligor or maker (percent) | 10.00% |  |  |  |  |  |  |  |  |  |  |  |  |  |
Concentration risk |  |  |  |  |  |  |  |  |  | 10.00% |  |  |  |  |

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