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Option Activity under Stock Plans (Detail) (USD $)
In Thousands, except Per Share data, unless otherwise specified
 9 Months Ended
Sep. 30, 2013
Number of Options Outstanding  
Beginning balance 13,806
Options granted 5,542
Options exercised (74)
Ending balance 16,865
Vested and expected to vest at end of period 16,272
Exercisable at end of period 10,977
Weighted-Average Price Per Share  
Beginning balance $ 3.38
Options granted $ 2.71
Options exercised $ 1.41
Ending balance $ 3.17
Vested and expected to vest at end of period $ 3.18
Exercisable at end of period $ 3.35
Weighted Average Remaining Contractual Life (In years)  
Balance as of September 30, 2013 5 years 4 months 6 days
Outstanding options vested and expected to vest at end of period 4 years 11 months 19 days
Options exercisable at end of period 3 years 4 months 13 days
Aggregate Intrinsic Value  
Balance as of September 30, 2013 $ 310
Outstanding options (vested and expected to vest) at end of period 310
Options exercisable at end of period $ 307
Unvested
  
Number of Options Outstanding  
Options cancelled (2,028)
Weighted-Average Price Per Share  
Options cancelled $ 3.33
Vested
  
Number of Options Outstanding  
Options cancelled (381)
Weighted-Average Price Per Share  
Options cancelled $ 3.56