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Summary of Option Activity Under Stock Plans (Detail)
$ / shares in Units, shares in Thousands, $ in Thousands
 12 Months Ended
Dec. 31, 2016
USD ($)
$ / shares
shares
Shares  
Beginning Balance | shares 5,330
Granted | shares 118
Exercised | shares (20)
Cancelled | shares (315)
Ending Balance | shares 5,113
Exercisable at December 31, 2016 | shares 4,490
Weighted-Average Exercise Price  
Beginning Balance | $ / shares $ 11.79
Granted | $ / shares 11.79
Exercised | $ / shares 5.25
Cancelled | $ / shares 12.71
Ending Balance | $ / shares 11.76
Exercisable at December 31, 2016 | $ / shares $ 12.49
Outstanding at December 31, 2016 8 years 3 months 18 days
Exercisable at December 31, 2016 8 years 2 months 12 days
Outstanding at December 31, 2016 | $ $ 20,293
Exercisable at December 31, 2016 | $ $ 17,135