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Option Activity under Stock Plans (Detail)
$ / shares in Units, shares in Thousands, $ in Thousands
 9 Months Ended
Sep. 30, 2015
USD ($)
$ / shares
shares
Number of Options Outstanding  
Beginning balance | shares 1,820
Options granted | shares 1,210
Options exercised | shares (16)
Ending balance | shares 2,800
Vested and expected to vest at end of period | shares 2,673
Exercisable at end of period | shares 1,232
Weighted-Average Price Per Share  
Beginning balance $ 27.48
Options granted 17.93
Options exercised 15.13
Ending balance 23.22
Vested and expected to vest at end of period 23.51
Exercisable at end of period $ 29.16
Weighted Average Remaining Contractual Life (In years)  
Balance at September 30, 2015 7 years 18 days
Outstanding options vested and expected to vest at end of period 6 years 11 months 12 days
Options exercisable at end of period 4 years 5 months 27 days
Aggregate Intrinsic Value  
Balance at September 30, 2015 | $ $ 14,157
Outstanding options (vested and expected to vest) at end of period | $ 13,217
Options exercisable at end of period | $ $ 3,846
Unvested  
Number of Options Outstanding  
Options cancelled | shares (117)
Weighted-Average Price Per Share  
Options cancelled $ 17.13
Vested  
Number of Options Outstanding  
Options cancelled | shares (97)
Weighted-Average Price Per Share  
Options cancelled $ 44.99