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The Company and Summary of Significant Accounting Policies (Details) (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 | 9 Months Ended | 12 Months Ended
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Sep. 30, 2012 | Sep. 30, 2011 | Sep. 30, 2012 item | Sep. 30, 2011 | Dec. 31, 2011 | Sep. 30, 2012 Purchased intangible assets | Dec. 31, 2011 Purchased intangible assets | Sep. 30, 2012 Developed technology | Dec. 31, 2011 Developed technology | Sep. 30, 2012 Developed technology Minimum | Dec. 31, 2011 Developed technology Minimum | Sep. 30, 2012 Developed technology Maximum | Dec. 31, 2011 Developed technology Maximum | Sep. 30, 2012 Customer relationships | Dec. 31, 2011 Customer relationships | Dec. 31, 2011 Contract backlog | Dec. 31, 2011 Non-compete agreements | Sep. 30, 2012 Patent license | Dec. 31, 2011 Patent license
The Company and Summary of Significant Accounting Policies |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Speed per second of high-speed interface technology of Bandwidth Engine ICs (in gigabits) |  |  | 10 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Allowance for Doubtful Accounts |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Maximum specific allowance as percentage of invoice value for problematic customer balances | 100.00% |  | 100.00% |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Revenue Recognition |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Support and maintenance revenue recognition period based on fair value established by VSOE |  |  | 12 months |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Goodwill |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Percentage of excess of fair value over carrying value of the reporting unit | 44.00% |  | 44.00% |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Intangible assets |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Life |  |  |  |  |  |  |  |  |  | 3 years | 3 years | 5 years | 5 years | 3 years | 3 years | 1 year | 1 year 6 months | 7 years | 7 years
Gross Carrying Amount | $ 10,410,000 |  | $ 10,410,000 |  | $ 11,300,000 | $ 9,630,000 | $ 10,520,000 | $ 9,240,000 | $ 9,240,000 |  |  |  |  | $ 390,000 | $ 390,000 | $ 750,000 | $ 140,000 | $ 780,000 | $ 780,000
Accumulated Amortization | 7,506,000 |  | 7,506,000 |  | 6,900,000 | 7,422,000 | 6,900,000 | 7,032,000 | 5,676,000 |  |  |  |  | 390,000 | 334,000 | 750,000 | 140,000 | 84,000 |
Net Carrying Value | 2,904,000 |  | 2,904,000 |  | 4,400,000 | 2,208,000 | 3,620,000 | 2,208,000 | 3,564,000 |  |  |  |  |  | 56,000 |  |  | 696,000 | 780,000
Amortization expense | 300,000 | 700,000 | 1,496,000 | 1,964,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Estimated aggregate amortization expense to be recognized in future |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Remainder of 2012 | 300,000 |  | 300,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
2013 | 1,000,000 |  | 1,000,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
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 (in shares) |  |  | 10,990,000 | 10,129,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |

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