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The Company and Summary of Significant Accounting Policies (Details 2) (USD $) | 3 Months Ended | 9 Months Ended |  |  |  | 9 Months Ended | 12 Months Ended | 9 Months Ended | 12 Months Ended | 9 Months Ended | 12 Months Ended
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Sep. 30, 2013 | Sep. 30, 2012 | Sep. 30, 2013 | Sep. 30, 2012 | Dec. 31, 2012 | Dec. 31, 2012 Purchased intangible assets | Sep. 30, 2013 Developed technology | Dec. 31, 2012 Developed technology | Sep. 30, 2013 Developed technology Minimum | Dec. 31, 2012 Developed technology Minimum | Sep. 30, 2013 Developed technology Maximum | Dec. 31, 2012 Developed technology Maximum | Dec. 31, 2012 Customer relationships | Sep. 30, 2013 Patent license | Dec. 31, 2012 Patent license
Revenue Recognition |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Support and maintenance revenue recognition period based on fair value established by VSOE |  |  | 12 months |  |  |  |  |  |  |  |  |  |  |  |
Threshold purchase return percentage by distributors for slow, non-moving or obsolete inventory |  |  | 10.00% |  |  |  |  |  |  |  |  |  |  |  |
Specified period for return of threshold percentage of purchases by distributors for slow, non-moving or obsolete inventory |  |  | 6 months |  |  |  |  |  |  |  |  |  |  |  |
Intangible assets |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Life |  |  |  |  |  |  |  |  | 3 years | 3 years | 5 years | 5 years | 3 years | 7 years | 7 years
Gross Carrying Amount | $ 10,020,000 |  | $ 10,020,000 |  | $ 10,410,000 | $ 9,630,000 | $ 9,240,000 | $ 9,240,000 |  |  |  |  | $ 390,000 | $ 780,000 | $ 780,000
Accumulated Amortization | 8,116,000 |  | 8,116,000 |  | 7,756,000 | 7,645,000 | 7,921,000 | 7,255,000 |  |  |  |  | 390,000 | 195,000 | 111,000
Net Carrying Value | 1,904,000 |  | 1,904,000 |  | 2,654,000 | 1,985,000 | 1,319,000 | 1,985,000 |  |  |  |  |  | 585,000 | 669,000
Amortization expense | 300,000 | 300,000 | 750,000 | 1,496,000 |  |  |  |  |  |  |  |  |  |  |
Estimated aggregate amortization expense to be recognized in future |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Remainder of 2013 | 300,000 |  | 300,000 |  |  |  |  |  |  |  |  |  |  |  |
2014 | 1,000,000 |  | 1,000,000 |  |  |  |  |  |  |  |  |  |  |  |
2015 | 300,000 |  | 300,000 |  |  |  |  |  |  |  |  |  |  |  |
2016 through 2018 | $ 100,000 |  | $ 100,000 |  |  |  |  |  |  |  |  |  |  |  |
Per Share Amounts |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Anti-dilutive securities excluded from computation of diluted net loss per share |  |  | 10,662,000 | 10,990,000 |  |  |  |  |  |  |  |  |  |  |

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