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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, 2014
Number of Options Outstanding  
Beginning balance 15,765
Options granted 5,455
Options exercised (25)
Ending balance 20,154
Vested and expected to vest at end of period 20,154
Exercisable at end of period 11,588
Weighted-Average Price Per Share  
Beginning balance $ 3.17
Options granted $ 1.69
Options exercised $ 0.54
Ending balance $ 2.77
Vested and expected to vest at end of period $ 2.77
Exercisable at end of period $ 3.27
Weighted Average Remaining Contractual Life (In years)  
Balance at June 30, 2014 6 years 1 month 21 days
Outstanding options vested and expected to vest at end of period 6 years 1 month 21 days
Options exercisable at end of period 3 years 10 months 17 days
Aggregate Intrinsic Value  
Balance at June 30, 2014 $ 647
Outstanding options (vested and expected to vest) at end of period 647
Options exercisable at end of period $ 548
Unvested
  
Number of Options Outstanding  
Options cancelled (454)
Weighted-Average Price Per Share  
Options cancelled $ 2.70
Vested
  
Number of Options Outstanding  
Options cancelled (587)
Weighted-Average Price Per Share  
Options cancelled $ 3.64