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Option Activity under Stock Plans (Detail) - Jun. 30, 2015 - USD ($)
$ / shares in Units, shares in Thousands, $ in Thousands
Total
Number of Options Outstanding  
Beginning balance 1,820
Options granted 1,094
Options exercised (8)
Ending balance 2,723
Vested and expected to vest at end of period 2,568
Exercisable at end of period 1,166
Weighted-Average Price Per Share  
Beginning balance $ 27.48
Options granted 16.83
Options exercised 15.60
Ending balance 22.92
Vested and expected to vest at end of period 23.27
Exercisable at end of period $ 29.61
Weighted Average Remaining Contractual Life (In years)  
SharebasedCompensationArrangementBySharebasedPaymentAwardOptionsOutstandingWeightedAverageRemainingContractualTerm2 7 years 2 months 23 days
Outstanding options vested and expected to vest at end of period 7 years 1 month 6 days
Options exercisable at end of period 4 years 7 months 21 days
Aggregate Intrinsic Value  
Balance at June 30, 2015 $ 12,303
Outstanding options (vested and expected to vest) at end of period 11,323
Options exercisable at end of period $ 3,001
Unvested  
Number of Options Outstanding  
Options cancelled (82)
Weighted-Average Price Per Share  
Options cancelled $ 17.34
Vested  
Number of Options Outstanding  
Options cancelled (101)
Weighted-Average Price Per Share  
Options cancelled $ 43.55