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Stockholders' Equity - Summary of Stock Option Activity (Detail)
$ / shares in Units, shares in Thousands, $ in Thousands
 9 Months Ended
Sep. 30, 2015
USD ($)
$ / shares
shares
Disclosure of Compensation Related Costs, Share-based Payments [Abstract]  
Stock Options,Outstanding, December 31, 2014 | shares 1,380
Stock Options, Granted | shares 0
Stock Options, Exercised | shares (33)
Stock Options, Forfeited | shares (177)
Stock Options,Outstanding, September 30, 2015 | shares 1,170
Stock Options,Exercisable, September 30, 2015 | shares 681
Stock Options,Expected to vest, September 30, 2015 | shares 1,169
Weighted Average Exercise Price, Outstanding, December 31, 2014 $ 7.70
Weighted Average Exercise Price, Granted 0
Weighted Average Exercise Price, Exercised 4.85
Weighted Average Exercise Price, Forfeited 12.13
Weighted Average Exercise Price, Outstanding, September 30, 2015 7.11
Weighted Average Exercise Price, Exercisable, September 30, 2015 8.91
Weighted Average Exercise Price, Expected to vest, September 30, 2015 $ 7.12
Weighted Average Remaining Contractual Term, Outstanding 5 years 1 month 6 days
Weighted Average Remaining Contractual Term, Exercisable 3 years 1 month 6 days
Weighted Average Remaining Contractual Term, Expected to vest 5 years 1 month 6 days
Aggregate Intrinsic Value, Outstanding, September 30, 2015 | $ $ 1,016
Aggregate Intrinsic Value, Exercisable, September 30, 2015 | $ 433
Aggregate Intrinsic Value, Expected to vest, September 30, 2015 | $ $ 1,015