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Option Activity under Stock Plans (Detail) (USD $)
In Thousands, except Share data, unless otherwise specified
 12 Months Ended
Dec. 31, 2013
Number of Options Outstanding  
Beginning balance 13,806,000
Options granted 5,614,000
Options exercised (131,000)
Ending balance 15,765,000
Vested and expected to vest at end of period 15,765,000
Exercisable at end of period 10,628,000
Weighted-Average Price Per Share  
Beginning balance $ 3.38
Options granted $ 2.69
Options exercised $ 1.43
Ending balance $ 3.17
Vested and expected to vest at end of period $ 3.17
Exercisable at end of period $ 3.36
Weighted Average Remaining Contractual Life (In years)  
Balance at December 31, 2013 5 years 3 months 4 days
Outstanding options vested and expected to vest at end of period 5 years 3 months 4 days
Options exercisable at end of period 3 years 7 months 10 days
Aggregate Intrinsic Value  
Balance at December 31, 2013 $ 1,427
Outstanding options (vested and expected to vest) at end of period 1,427
Options exercisable at end of period $ 1,289
Unvested
  
Number of Options Outstanding  
Options cancelled (2,555,000)
Weighted-Average Price Per Share  
Options cancelled $ 3.31
Vested
  
Number of Options Outstanding  
Options cancelled (969,000)
Weighted-Average Price Per Share  
Options cancelled $ 3.34