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Stock-Based Awards and Stock-Based Compensation - Stock Plan Activity (Detail)
$ / shares in Units, $ in Thousands
6 Months Ended
Jun. 30, 2016
USD ($)
$ / shares
shares
Shares Available for Grant  
Beginning balance, Shares Available for Grant (shares) 3,642,166
Additional shares reserved, balance, Shares Available for Grant (shares) 2,979,417
Forfeited – stock options, balance, Shares Available for Grant (shares) 895,769
Ending balance, Shares Available for Grant (shares) 3,405,781
Outstanding Stock Options  
Beginning balance, Outstanding Stock Options (shares) 6,976,957
Forfeited - stock options, Outstanding Stock Options (shares) (895,769)
Exercised - stock options, Outstanding Stock Options (shares) (136,747)
Ending balance, Outstanding Stock Options (shares) 7,921,730
End of period exercisable balance, Outstanding Stock Options (shares) 4,433,002
Vested and expected to vest, Outstanding Stock Options (shares) 7,534,161
Weighted average exercise price  
Beginning balance, Weighted average exercise price (usd per share) | $ / shares $ 5.59
Forfeited - stock options, Weighted average exercise price (usd per share) | $ / shares 8.18
Exercised - stock options, Weighted average exercise price (usd per share) | $ / shares 1.66
Ending balance, Weighted average exercise price (usd per share) | $ / shares 4.86
End of period exercisable balance, Weighted average exercise price (usd per share) | $ / shares 5.14
Vested and expected to vest, Weighted average exercise price (usd per share) | $ / shares $ 4.87
Weighted average remaining life (in years)  
End of period balance, Weighted average remaining life (in years) 6 years 1 month 16 days
End of period exercisable balance, Weighted average remaining life (in years) 3 years 6 months 29 days
Vested and expected to vest, Weighted average remaining life (in years) 5 years 11 months 23 days
Aggregate intrinsic value (in thousands)  
End of period balance, Aggregate intrinsic value | $ $ 6,089
End of period balance, Aggregate intrinsic value | $ 5,738
Vested and expected to vest, Aggregate intrinsic value | $ $ 6,022
Employee Stock Option [Member]  
Shares Available for Grant  
Stock options granted, balance, Shares Available for Grant (shares) (1,057,289)
Outstanding Stock Options  
Granted - stock options, Outstanding Stock Options (shares) 1,057,289
Weighted average exercise price  
Granted - stock options, Weighted average exercise price (usd per share) | $ / shares $ 3.38
Performance Based Options [Member]  
Shares Available for Grant  
Stock options granted, balance, Shares Available for Grant (shares) (920,000)
Outstanding Stock Options  
Granted - stock options, Outstanding Stock Options (shares) 920,000
Weighted average exercise price  
Granted - stock options, Weighted average exercise price (usd per share) | $ / shares $ 3.79
Restricted Stock Units (RSUs) [Member]  
Shares Available for Grant  
Granted – RSUs, balance, Shares Available for Grant (shares) (3,046,816)
Forfeited, Shares Available for Grant (shares) 806,918
Vested RSUs adjusted for taxes, Shares Available for Grant (shares) 105,616