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Stock-Based Compensation - Summary of Stock Option Activity (Detail)
$ / shares in Units, $ in Thousands
 3 Months Ended
Mar. 31, 2017
USD ($)
$ / shares
shares
Disclosure of Compensation Related Costs, Share-based Payments [Abstract]  
Number of options, Outstanding beginning balance | shares 2,829,301
Number of options, Granted | shares 365,555
Number of options, Exercised | shares (136,249)
Number of options, Forfeited or expired | shares (54,822)
Number of options, Outstanding ending balance | shares 3,003,785
Number of options, Exercisable | shares 1,437,144
Number of options, Vested and expected to vest | shares 2,956,125
Weighted average exercise price, Outstanding beginning balance $ 6.89
Weighted average exercise price, Granted 2.78
Weighted average exercise price, Exercised 2.19
Weighted average exercise price, Forfeited or expired 7.69
Weighted average exercise price, Outstanding ending balance 6.59
Weighted average exercise price, Exercisable 6.99
Weighted average exercise price, Vested and expected to vest $ 6.56
Weighted average remaining contractual term, Outstanding ending balance 8 years 29 days
Weighted average remaining contractual term, Exercisable 7 years 2 months 23 days
Weighted average remaining contractual term, Vested and expected to vest 8 years 29 days
Aggregate intrinsic value, Exercised | $ $ 0
Aggregate intrinsic value, Forfeited or expired $ 0
Aggregate intrinsic value, Outstanding | $ $ 1,496
Aggregate intrinsic value, Exercisable | $ 846
Aggregate intrinsic value, Vested and expected to vest | $ $ 1,485