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Equity Award Plans - Restricted Stock Units (Details) (Restricted Stock Units (RSUs) [Member], USD $)
Share data in Thousands, unless otherwise specified
0 Months Ended 12 Months Ended
Dec. 31, 2011
Dec. 31, 2012
Dec. 31, 2011
Dec. 31, 2010
Dec. 31, 2009
Dec. 31, 2012
Restricted Stock Units (RSUs) [Member]
           
Number of RSUs Outstanding            
Beginning balance, shares   136 168 49    
RSUs vested and expected to vest (in shares) 122 288 122 119    
Awarded, (in shares)   441 20 149    
Released (in shares)   (45) (17)      
Forefeited or cancelled (in shares)   (110) (34) (30)    
Ending balance, shares 136 422 136 168 49  
Weighted Average Remaining Contractual Life (Years)            
Beginning balance, dollars per share 1 year 8 months 27 days 2 years 3 months 15 days   2 years 8 months 1 day 2 years 5 months 27 days  
RSUs vested and expected to vest (in years) 1 year 8 months 12 days 1 year 11 months 27 days   2 years 7 months 24 days    
Ending balance, dollars per share 1 year 8 months 27 days 2 years 3 months 15 days   2 years 8 months 1 day 2 years 5 months 27 days  
Aggregate Intrinsic Value            
Beginning balance, aggregate intrinsic value   $ 1,072,000 $ 2,346,000 $ 506,000   $ 3,716,000
RSUs vested and expected to vest 798,000 2,544,000 798,000 1,663,000    
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Vested in Period, Total Fair Value   $ 2,300,000 $ 6,500,000 $ 5,800,000