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Stock-Based Awards and Stock-Based Compensation - Stock Option Activity and Stock Options Outstanding (Detail)
$ / shares in Units, $ in Thousands
3 Months Ended
Mar. 31, 2016
USD ($)
$ / shares
shares
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]  
Beginning balance, Shares Available for Grant 3,642,166
Additional shares reserved, balance, Shares Available for Grant 2,979,417
Stock options granted, balance, Shares Available for Grant (726,949)
Forfeited – stock options, balance, Shares Available for Grant 444,489
Ending balance, Shares Available for Grant 5,009,317
Beginning balance, Outstanding Stock Options 6,976,957
Granted - stock options, Outstanding Stock Options 726,949
Forfeited - stock options, Outstanding Stock Options (444,489)
Exercised - stock options, Outstanding Stock Options (27,337)
Ending balance, Outstanding Stock Options 7,232,080
Exercisable at March 31, 2016, Outstanding Stock Options 4,443,999
Vested and expected to vest, Outstanding Stock Options 6,718,503
Beginning balance, Weighted average exercise price | $ / shares $ 5.59
Granted - stock options, Weighted average exercise price | $ / shares 3.24
Forfeited - stock options, Weighted average exercise price | $ / shares 8.48
Exercised - stock options, Weighted average exercise price | $ / shares 1.39
Ending balance, Weighted average exercise price | $ / shares 5.19
Exercisable at March 31, 2016, Weighted average exercise price | $ / shares 5.27
Vested and expected to vest, Weighted average exercise price | $ / shares $ 5.22
Balances, March 31, 2016, Weighted average remaining life (in years) 5 years 9 months 18 days
Exercisable at March 31, 2016, Weighted average remaining life (in years) 3 years 7 months 28 days
Vested and expected to vest, Weighted average remaining life (in years) 5 years 5 months 12 days
Balances, March 31, 2016, Aggregate intrinsic value | $ $ 6,396
Exercisable at March 31, 2016, Aggregate intrinsic value | $ 6,014
Vested and expected to vest, Aggregate intrinsic value | $ $ 6,312
Restricted stock units [Member]  
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]  
Granted – RSUs, balance, Shares Available for Grant (1,707,796)
Forfeited, Shares Available for Grant 333,802
Vested RSUs adjusted for taxes, Shares Available for Grant 44,188