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Commitments and Contingencies (Details) (USD $) In Millions, unless otherwise specified |  |  |  |  |  | 3 Months Ended |  |
--- | --- | --- | --- | --- | --- | --- | --- | ---
Mar. 31, 2013 | May 05, 2008 Patent Infringement Litigation Versus Extreme Networks Patents | Apr. 09, 2008 Patent Infringement Litigation Versus Extreme Networks Patents | May 30, 2007 Patent Infringement Litigation Versus Extreme Networks Patents | Jun. 21, 2005 Patent Infringement Litigation Versus Extreme Networks Patents | Mar. 31, 2013 Patent Infringement Litigation Versus Enterasys | Jun. 30, 2012 Patent Infringement Litigation Versus Enterasys | May 30, 2008 Patent Infringement Litigation Versus Enterasys Patents | May 30, 2008 Patent Infringement Litigation Versus Enterasys Positive Outcome of Litigation | Jun. 30, 2012 Patent Infringement Litigation Versus Chrismar Systems, Inc. Pending Litigation | Jun. 30, 2012 Patent Infringement Litigation Versus Chrismar Systems, Inc. Pending Litigation Minimum | Jun. 30, 2012 Patent Infringement Litigation Versus Chrismar Systems, Inc. Pending Litigation Maximum
Loss Contingencies [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Non-cancelable purchase commitments | $ 30.3 |  |  |  |  |  |  |  |  |  |  |
Number of patents owned |  |  |  | 3 | 6 |  |  |  |  |  |  |
Patents owned in petition for reexamination (in patents) |  |  |  |  | 5 |  |  |  |  |  |  |
Patents associated with dismissed litigation (in patents) |  | 2 | 1 |  | 2 |  |  |  |  |  |  |
Patents associated with successful litigation (in patents) |  |  |  |  |  |  |  | 3 |  |  |  |
Amount awarded by court |  |  |  |  |  |  |  |  | 0.2 |  |  |
Proceeds from legal settlement |  |  |  |  |  | 0.4 | 0.6 |  |  |  |  |
Estimate for range of loss of litigation |  |  |  |  |  |  |  |  |  | $ 0.3 | $ 0.3 | $ 1.4

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