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Option Activity under Stock-Based Compensation Plans (Detail)
shares in Thousands
12 Months Ended
Dec. 31, 2016
$ / shares
shares
Shares Underlying Outstanding Options  
Beginning balance | shares 2,891
Options granted | shares 1,414
Options exercised | shares (16)
Ending balance | shares 3,975
Vested and expected to vest at December 31, 2016 | shares 3,951
Exercisable at December 31, 2016 | shares 1,836
Weighted-Average Price Per Share  
Beginning balance | $ / shares $ 23.34
Options granted | $ / shares 19.56
Options exercised | $ / shares 13.81
Ending balance | $ / shares 21.38
Vested and expected to vest at December 31, 2016 | $ / shares 21.40
Exercisable at December 31, 2016 | $ / shares $ 23.94
Weighted-Average Remaining Contractual Term (years)  
Balance at December 31, 2016 6 years 8 months 5 days
Vested and expected to vest at December 31, 2016 6 years 8 months 1 day
Exercisable at December 31, 2016 5 years 8 months 23 days
Unvested  
Shares Underlying Outstanding Options  
Options cancelled | shares (84)
Weighted-Average Price Per Share  
Options cancelled | $ / shares $ 18.23
Vested  
Shares Underlying Outstanding Options  
Options cancelled | shares (230)
Weighted-Average Price Per Share  
Options cancelled | $ / shares $ 36.64