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Option Activity under Stock-Based Compensation Plans (Detail)
$ / shares in Units, shares in Thousands, $ in Thousands
 12 Months Ended
Dec. 31, 2017
USD ($)
$ / shares
shares
Shares Underlying Outstanding Options  
Beginning balance | shares 3,975
Options granted | shares 535
Options exercised | shares (144)
Ending balance | shares 3,555
Vested and expected to vest at December 31, 2017 | shares 3,533
Exercisable at December 31, 2017 | shares 2,294
Weighted-Average Exercise Price Per Share  
Beginning balance | $ / shares $ 21.38
Options granted | $ / shares 12.23
Options exercised | $ / shares 14.28
Ending balance | $ / shares 19.56
Vested and expected to vest at December 31, 2017 | $ / shares 19.56
Exercisable at December 31, 2017 | $ / shares $ 21.35
Weighted-Average Remaining Contractual Term (years)  
Balance at December 31, 2017 6 years 14 days
Vested and expected to vest at December 31, 2017 6 years 14 days
Exercisable at December 31, 2017 5 years 9 months 7 days
Aggregate Intrinsic Value  
Balance at December 31, 2017 | $ $ 7,477
Vested and expected to vest at December 31, 2017 | $ 7,468
Exercisable at December 31, 2017 | $ $ 2,702
Unvested  
Shares Underlying Outstanding Options  
Options cancelled | shares (400)
Weighted-Average Exercise Price Per Share  
Options cancelled | $ / shares $ 18.30
Vested  
Shares Underlying Outstanding Options  
Options cancelled | shares (411)
Weighted-Average Exercise Price Per Share  
Options cancelled | $ / shares $ 30.78