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The Company and Summary of Significant Accounting Policies (Details 2) (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
Jun. 30, 2013
Jun. 30, 2012
Jun. 30, 2013
Jun. 30, 2012
Dec. 31, 2012
Dec. 31, 2012
Purchased intangible assets
Jun. 30, 2013
Developed technology
Dec. 31, 2012
Developed technology
Jun. 30, 2013
Developed technology
Minimum
Dec. 31, 2012
Developed technology
Minimum
Jun. 30, 2013
Developed technology
Maximum
Dec. 31, 2012
Developed technology
Maximum
Dec. 31, 2012
Customer relationships
Jun. 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 7,866,000   7,866,000   7,756,000 7,645,000 7,699,000 7,255,000         390,000 167,000 111,000
Net Carrying Value 2,154,000   2,154,000   2,654,000 1,985,000 1,541,000 1,985,000           613,000 669,000
Amortization expense 300,000 600,000 500,000 1,246,000                      
Estimated aggregate amortization expense to be recognized in future                              
Remainder of 2013 500,000   500,000                        
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     10,892,000 10,931,000