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Equity Award Plans and Stock-Based Compensation Scedule of restricted stock activity (Details) (Restricted Stock Units (RSUs) [Member], USD $)
0 Months Ended 6 Months Ended
Dec. 31, 2011
Jun. 30, 2012
Restricted Stock Units (RSUs) [Member]
   
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Nonvested, Number of Shares [Roll Forward]    
Balances at January 1, 2012, Number of RSUs Outstanding (in shares)   137
Balances at January 1, 2012, Aggregate Intrinsic Value 1 year 8 months 27 days 2 years 4 months 10 days
Balances at January 1, 2012, Weighted Average Remaing Contractual Term (in years)   $ 1,072
Awarded, Number of RSUs Outstanding (in shares)   161
Released, Number of RSUs Outstanding (in shares)   (30)
Forefeited or cancelled, Number of RSUs Outstanding (in shares)   (36)
Balances at June 30, 2012, Number of RSUs Outstanding (in shares) 137 232
Balances at June 30, 2012, Aggregate Intrinsic Value 1 year 8 months 27 days 2 years 4 months 10 days
Balances at June 30, 2012, Weighted Average Remaining Contractual Term (in years) $ 1,072 $ 1,859
RSUs vested and expected to vest at June 30, 2012, Number of RSU's Outstanding (in shares)   161
RSUs vested and expected to vest at June 30, 2012, Weighted Average Remaining Contractual Life (in years)   2 years 3 months 7 days
RSUs vested and expected to vest at June 30, 2012, Aggregate Intrinsic Value   $ 1,293