The Company and Summary of Significant Accounting Policies (Details 2) (USD $)	12 Months Ended								12 Months Ended							1 Months Ended
	Dec. 31, 2013	Dec. 31, 2012	Dec. 31, 2011	Dec. 31, 2013 Minimum	Dec. 31, 2013 Maximum	Dec. 31, 2012 Purchased intangible assets	Dec. 31, 2013 Developed technology	Dec. 31, 2012 Developed technology	Dec. 31, 2013 Developed technology Minimum	Dec. 31, 2012 Developed technology Minimum	Dec. 31, 2013 Developed technology Maximum	Dec. 31, 2012 Developed technology Maximum	Dec. 31, 2012 Customer relationships	Dec. 31, 2013 Patent license	Dec. 31, 2012 Patent license	Dec. 31, 2011 Memory technology patents Item
Intangible assets
Number of intangible assets sold																73
Life				3 years	7 years				3 years	3 years	5 years	5 years	3 years	7 years	7 years
Gross Carrying Amount	$ 10,020,000	$ 10,410,000				$ 9,630,000	$ 9,240,000	$ 9,240,000					$ 390,000	$ 780,000	$ 780,000
Accumulated Amortization	8,365,000	7,756,000				7,645,000	8,142,000	7,255,000					390,000	223,000	111,000
Net Carrying Amount	1,655,000	2,654,000				1,985,000	1,098,000	1,985,000						557,000	669,000
Estimated aggregate amortization expense to be recognized in future
2014	1,000,000
2015	300,000
2016	100,000
2018	100,000
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
Per Share Amounts
Anti-dilutive securities excluded from computation of diluted net loss per share	10,072,000	10,384,000	9,015,000
Numerator:
Net income (loss)	$ (24,794,000)	$ (27,614,000)	$ 11,256,000
Denominator:
Add: weighted-average common shares outstanding	45,246,000	39,176,000	37,942,000
Less: unvested common shares subject to repurchase			(81,000)
Total shares: basic	45,246,000	39,176,000	37,861,000
Add: weighted-average stock options outstanding (in shares)			2,435,000
Add: common shares subject to repurchase			81,000
Total shares: diluted	45,246,000	39,176,000	40,377,000
Net income (loss) per share:
Basic (in dollars per share)	$ (0.55)	$ (0.70)	$ 0.30
Diluted (in dollars per share)	$ (0.55)	$ (0.70)	$ 0.28
Income Taxes
Period over which the Company expects its unrecognized tax benefits to not change significantly	12 months