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Option Activity under Stock Plans (Detail) (USD $)
In Thousands, except Per Share data, unless otherwise specified
 6 Months Ended
Jun. 30, 2013
Number of Options Outstanding  
Beginning balance 13,806
Options granted 5,421
Options exercised (74)
Ending balance 17,622
Vested and expected to vest at end of period 16,754
Exercisable at end of period 10,503
Weighted-Average Price Per Share  
Beginning balance $ 3.38
Options granted $ 2.74
Options exercised $ 1.41
Ending Balance $ 3.19
Vested and expected to vest at end of period $ 3.20
Exercisable at end of period $ 3.37
Weighted Average Remaining Contractual Life (In years)  
Balance as of June 30, 2013 6 years 3 months 7 days
Outstanding options vested and expected to vest at end of period 6 years 1 month 13 days
Options exercisable at end of period 4 years 5 months 16 days
Aggregate Intrinsic Value  
Balance as of June 30, 2013 $ 263
Outstanding options (vested and expected to vest) at end of period 263
Options exercisable at end of period $ 263
Unvested
  
Number of Options Outstanding  
Options cancelled (1,350)
Weighted-Average Price Per Share  
Options cancelled $ 3.32
Vested
  
Number of Options Outstanding  
Options cancelled (181)
Weighted-Average Price Per Share  
Options cancelled $ 4.09