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Option Activity under Stock Plans (Detail)
$ / shares in Units, shares in Thousands, $ in Thousands
 12 Months Ended
Dec. 31, 2015
USD ($)
$ / shares
shares
Number of Options Outstanding  
Beginning balance | shares 1,820
Options granted | shares 1,339
Options exercised | shares (38)
Ending balance | shares 2,891
Vested and expected to vest at end of period | shares 2,788
Exercisable at end of period | shares 1,271
Weighted-Average Price Per Share  
Beginning balance | $ / shares $ 27.48
Options granted | $ / shares 18.51
Options exercised | $ / shares 15.67
Ending balance | $ / shares 23.34
Vested and expected to vest at end of period | $ / shares 23.57
Exercisable at end of period | $ / shares $ 29.06
Weighted Average Remaining Contractual Life (In years)  
Balance at December 31, 2015 6 years 11 months 12 days
Outstanding options vested and expected to vest at end of period 6 years 10 months 17 days
Options exercisable at end of period 4 years 5 months 5 days
Aggregate Intrinsic Value  
Balance at December 31, 2015 | $ $ 13,234
Outstanding options (vested and expected to vest) at end of period | $ 12,514
Options exercisable at end of period | $ $ 3,734
Unvested  
Number of Options Outstanding  
Options cancelled | shares (133)
Weighted-Average Price Per Share  
Options cancelled | $ / shares $ 17.07
Vested  
Number of Options Outstanding  
Options cancelled | shares (97)
Weighted-Average Price Per Share  
Options cancelled | $ / shares $ 45.01