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Summary of Restricted Stock and Restricted Stock Unit (RSU) Activity (Detail) - Restricted Stock and Restricted Stock Units
9 Months Ended
Sep. 30, 2017
$ / shares
shares
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]  
Unvested beginning balance, Number Outstanding | shares 1,973,459
Granted, Number Outstanding | shares 338,646
Vested, Number Outstanding | shares (480,764)
Forfeited, Number Outstanding | shares (132,441)
Unvested ending balance, Number Outstanding | shares 1,698,900
Shares vested but not released, Number Outstanding | shares 295,386
Unvested beginning balance, Weighted Average Fair Value | $ / shares $ 2.80
Granted, Weighted Average Fair Value | $ / shares 5.12
Vested, Weighted Average Fair Value | $ / shares 3.41
Forfeited, Weighted Average Fair Value | $ / shares 3.19
Unvested ending balance, Weighted Average Fair Value | $ / shares 3.06
Shares vested but not released, Weighted Average Fair Value | $ / shares $ 2.51