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The Company and Summary of Significant Accounting Policies (Details) (USD $)
 3 Months Ended 6 Months Ended 6 Months Ended 12 Months Ended 6 Months Ended 12 Months Ended 6 Months Ended 12 Months Ended 6 Months Ended 12 Months Ended 6 Months Ended 12 Months Ended 6 Months Ended 12 Months Ended
Jun. 30, 2012
Jun. 30, 2011
Jun. 30, 2012
item
Jun. 30, 2011
Dec. 31, 2011
Sep. 30, 2011
Jun. 30, 2012
Purchased intangible assets
Dec. 31, 2011
Purchased intangible assets
Jun. 30, 2012
Developed technology
Dec. 31, 2011
Developed technology
Jun. 30, 2012
Developed technology
Minimum
Dec. 31, 2011
Developed technology
Minimum
Jun. 30, 2012
Developed technology
Maximum
Dec. 31, 2011
Developed technology
Maximum
Jun. 30, 2012
Customer relationships
Dec. 31, 2011
Customer relationships
Jun. 30, 2012
Contract backlog
Dec. 31, 2011
Contract backlog
Jun. 30, 2012
Non-compete agreements
Dec. 31, 2011
Non-compete agreements
Jun. 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           61.00%                                
Intangible assets                                            
Life                     3 years 3 years 5 years 5 years 3 years 3 years 1 year 1 year 1 year 6 months 1 year 6 months 7 years 7 years
Gross Carrying Amount $ 11,300,000   $ 11,300,000   $ 11,300,000   $ 10,520,000 $ 10,520,000 $ 9,240,000 $ 9,240,000         $ 390,000 $ 390,000 $ 750,000 $ 750,000 $ 140,000 $ 140,000 $ 780,000 $ 780,000
Accumulated Amortization 8,146,000   8,146,000   6,900,000   8,090,000 6,900,000 6,810,000 5,676,000         390,000 334,000 750,000 750,000 140,000 140,000 56,000  
Net Carrying Value 3,154,000   3,154,000   4,400,000   2,430,000 3,620,000 2,430,000 3,564,000           56,000         724,000 780,000
Amortization expense 600,000 700,000 1,246,000 1,309,000                                    
Estimated aggregate amortization expense to be recognized in future                                            
Remainder of 2012 500,000   500,000                                      
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     10,931,000 10,174,000