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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, 2017
USD ($)
$ / shares
shares
Shares Underlying Outstanding Options  
Beginning balance | shares 3,975
Options granted | shares 329
Options exercised | shares (50)
Ending balance | shares 3,686
Vested and expected to vest at September 30, 2017 | shares 3,671
Exercisable at September 30, 2017 | shares 2,394
Weighted-Average Exercise Price Per Share  
Beginning balance | $ / shares $ 21.38
Options granted | $ / shares 6.99
Options exercised | $ / shares 11.82
Ending balance | $ / shares 20.05
Vested and expected to vest at September 30, 2017 | $ / shares 20.06
Exercisable at September 30, 2017 | $ / shares $ 22.18
Weighted-Average Remaining Contractual Term (years)  
Balance at September 30, 2017 5 years 9 months 15 days
Vested and expected to vest at September 30, 2017 5 years 9 months 15 days
Exercisable at September 30, 2017 5 years 4 months 24 days
Aggregate Intrinsic Value  
Balance at September 30, 2017 | $ $ 13,420
Vested and expected to vest at September 30, 2017 | $ 13,390
Exercisable at September 30, 2017 | $ $ 5,948
Unvested  
Shares Underlying Outstanding Options  
Options cancelled | shares (351)
Weighted-Average Exercise Price Per Share  
Options cancelled | $ / shares $ 18.43
Vested  
Shares Underlying Outstanding Options  
Options cancelled | shares (217)
Weighted-Average Exercise Price Per Share  
Options cancelled | $ / shares $ 29.11