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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, 2014
Number of Options Outstanding  
Beginning balance 15,765
Options granted 5,673
Options exercised (25)
Ending balance 18,819
Vested and expected to vest at end of period 18,819
Exercisable at end of period 10,553
Weighted-Average Price Per Share  
Beginning balance $ 3.17
Options granted $ 1.68
Options exercised $ 0.54
Ending balance $ 2.77
Vested and expected to vest at end of period $ 2.77
Exercisable at end of period $ 3.34
Weighted Average Remaining Contractual Life (In years)  
Balance at September 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 September 30, 2014 $ 444
Outstanding options (vested and expected to vest) at end of period 444
Options exercisable at end of period $ 421
Unvested
  
Number of Options Outstanding  
Options cancelled (582)
Weighted-Average Price Per Share  
Options cancelled $ 2.69
Vested
  
Number of Options Outstanding  
Options cancelled (2,012)
Weighted-Average Price Per Share  
Options cancelled $ 2.90