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Option Activity under Stock Plans (Detail) (USD $)
In Thousands, except Share data, unless otherwise specified
 3 Months Ended
Mar. 31, 2013
Number of Options Outstanding  
Number of share outstanding beginning balance 13,806,000
Options granted 2,981,000
Options exercised (57,000)
Ending balance 16,348,000
Vested and expected to vest at March 31, 2013 15,089,000
Exercisable at March 31, 2013 8,625,000
Weighted-Average Price Per Share  
Beginning balance $ 3.38
Options granted $ 2.96
Options exercised $ 1.50
Ending Balance $ 3.31
Vested and expected to vest $ 3.32
Exercisable $ 3.41
Weighted Average Remaining Contractual Life (In years)  
Weighted average remaining contractual life (in years) 7 years 2 months 5 days
Outstanding options vested and expected to vest 7 years 11 days
Options exercisable 5 years 10 months 17 days
Aggregate Intrinsic Value  
Granted $ 2,086
Outstanding options (vested and expected to vest) 2,065
Options exercisable $ 1,814
Unvested
  
Number of Options Outstanding  
Options cancelled (361,000)
Weighted-Average Price Per Share  
Options cancelled $ 3.64
Vested
  
Number of Options Outstanding  
Options cancelled (21,000)
Weighted-Average Price Per Share  
Options cancelled $ 2.85