The Company and Summary of Significant Accounting Policies (Details 2) (USD $)	3 Months Ended							3 Months Ended	12 Months Ended	3 Months Ended	12 Months Ended		3 Months Ended	12 Months Ended
	Mar. 31, 2013	Mar. 31, 2012	Dec. 31, 2012	Mar. 31, 2013 Purchased intangible assets	Dec. 31, 2012 Purchased intangible assets	Mar. 31, 2013 Developed technology	Dec. 31, 2012 Developed technology	Mar. 31, 2013 Developed technology Minimum	Dec. 31, 2012 Developed technology Minimum	Mar. 31, 2013 Developed technology Maximum	Dec. 31, 2012 Developed technology Maximum	Dec. 31, 2012 Customer relationships	Mar. 31, 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		$ 10,410,000	$ 9,240,000	$ 9,630,000	$ 9,240,000	$ 9,240,000					$ 390,000	$ 780,000	$ 780,000
Accumulated Amortization	7,616,000		7,756,000	7,477,000	7,645,000	7,477,000	7,255,000					390,000	139,000	111,000
Net Carrying Value	2,404,000		2,654,000	1,763,000	1,985,000	1,763,000	1,985,000						641,000	669,000
Amortization expense	250,000	683,000
Estimated aggregate amortization expense to be recognized in future
Remainder of 2013	800,000
2014	1,000,000
2015	300,000
2016 through 2018	$ 100,000
Per Share Amounts
Anti-dilutive securities excluded from computation of diluted net loss per share	9,970,000	11,546,000