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Option Activity under Stock-Based Compensation Plans (Detail)
$ / shares in Units, shares in Thousands, $ in Thousands
 9 Months Ended
Sep. 30, 2016
USD ($)
$ / shares
shares
Shares Underlying Outstanding Options  
Beginning balance | shares 2,891
Options granted | shares 1,351
Options exercised | shares (16)
Ending balance | shares 4,136
Vested and expected to vest at September 30, 2016 | shares 4,098
Exercisable at September 30, 2016 | shares 1,755
Weighted-Average Price Per Share  
Beginning balance | $ / shares $ 23.34
Options granted | $ / shares 19.95
Options exercised | $ / shares 13.81
Ending balance | $ / shares 22.06
Vested and expected to vest at September 30, 2016 | $ / shares 22.10
Exercisable at September 30, 2016 | $ / shares $ 25.70
Weighted-Average Remaining Contractual Term (years)  
Balance at September 30, 2016 6 years 9 months 4 days
Vested and expected to vest at September 30, 2016 6 years 8 months 27 days
Exercisable at September 30, 2016 5 years 3 months 18 days
Aggregate Intrinsic Value  
Balance at September 30, 2016 | $ $ 182
Vested and expected to vest at September 30, 2016 | $ 182
Exercisable at September 30, 2016 | $ $ 182
Unvested  
Shares Underlying Outstanding Options  
Options cancelled | shares (36)
Weighted-Average Price Per Share  
Options cancelled | $ / shares $ 19.22
Vested  
Shares Underlying Outstanding Options  
Options cancelled | shares (54)
Weighted-Average Price Per Share  
Options cancelled | $ / shares $ 42.90