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Activity under Stock Plans (Detail) (USD $)
In Thousands, except Share data, unless otherwise specified
 12 Months Ended
Dec. 31, 2012
Number of Options Outstanding  
Number of share outstanding beginning balance 10,987,000
Options granted 4,534,000
Options exercised (1,166,000)
Ending balance 13,806,000
Vested and expected to vest at December 31, 2012 12,886,000
Exercisable at December 31, 2012 7,226,000
Weighted-Average Price Per Share  
Beginning balance $ 3.10
Options granted $ 3.68
Options exercised $ 1.79
Ending Balance $ 3.38
Vested and expected to vest $ 3.37
Exercisable at December 31, 2012 $ 3.49
Weighted Average Remaining Contractual Life (In years)  
Weighted average remaining contractual life (in years) 7 years 3 months 4 days
Outstanding options vested and expected to vest 7 years 1 month 17 days
Options exercisable 5 years 10 months 28 days
Aggregate Intrinsic Value  
Granted $ 4,015
Outstanding options (vested and expected to vest) 3,955
Options exercisable $ 2,825
Unvested
  
Number of Options Outstanding  
Options cancelled (505,000)
Weighted-Average Price Per Share  
Options cancelled $ 3.32
Vested
  
Number of Options Outstanding  
Options cancelled (44,000)
Weighted-Average Price Per Share  
Options cancelled $ 5.53