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Option Activity under Stock Plans (Detail) (USD $)
In Thousands, except Per Share data, unless otherwise specified
 3 Months Ended
Mar. 31, 2014
Number of Options Outstanding  
Beginning balance 15,765
Options granted 4,890
Options exercised   
Ending balance 20,105
Vested and expected to vest at end of period 20,105
Exercisable at end of period 10,899
Weighted-Average Price Per Share  
Beginning balance $ 3.17
Options granted $ 1.71
Options exercised   
Ending balance $ 2.80
Vested and expected to vest at end of period $ 2.80
Exercisable at end of period $ 3.32
Weighted Average Remaining Contractual Life (In years)  
Balance at March 31, 2014 6 years 3 months
Outstanding options vested and expected to vest at end of period 6 years 3 months
Options exercisable at end of period 3 years 9 months 4 days
Aggregate Intrinsic Value  
Balance at March 31, 2014 $ 1,566
Outstanding options (vested and expected to vest) at end of period 1,566
Options exercisable at end of period $ 969
Unvested
  
Number of Options Outstanding  
Options cancelled (89)
Weighted-Average Price Per Share  
Options cancelled $ 2.71
Vested
  
Number of Options Outstanding  
Options cancelled (461)
Weighted-Average Price Per Share  
Options cancelled $ 3.71