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Share-Based Compensation - Summary of Stock Option Activity (Detail)
shares in Thousands
 9 Months Ended
Sep. 30, 2015
$ / shares
shares
Disclosure Of Compensation Related Costs Sharebased Payments [Abstract]  
Beginning balance of Outstanding, Options 3,782
Granted, Options 792
Exercised, Options (232)
Forfeited, Options (999)
Cancelled, Options (339)
Ending balance of Outstanding, Options 3,004
Exercisable, Options 1,941
Beginning balance of Outstanding, Weighted Average Exercise Price | $ / shares $ 12.88
Granted, Weighted Average Exercise Price | $ / shares 4.88
Exercised, Weighted Average Exercise Price | $ / shares 2.72
Forfeited, Weighted Average Exercise Price | $ / shares 4.32
Cancelled, Weighted Average Exercise Price | $ / shares 19.32
Ending balance of Outstanding, Weighted Average Exercise Price | $ / shares 13.68
Exercisable, Weighted Average Exercise Price | $ / shares $ 18.48