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Summary of Restricted Stock and Restricted Stock Unit (RSU) Activity (Detail) - Restricted Stock and Restricted Stock Units
6 Months Ended
Jun. 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 120,180
Vested, Number Outstanding | shares (212,519)
Forfeited, Number Outstanding | shares (127,282)
Unvesteed ending balance, Number Outstanding | shares 1,753,838
Shares vested but not released, Number Outstanding | shares 278,552
Unvested beginning balance, Weighted Average Fair Value | $ / shares $ 2.80
Granted, Weighted Average Fair Value | $ / shares 5.46
Vested, Weighted Average Fair Value | $ / shares 4.51
Forfeited, Weighted Average Fair Value | $ / shares 3.21
Unvesteed ending balance, Weighted Average Fair Value | $ / shares 2.74
Shares vested but not released, Weighted Average Fair Value | $ / shares $ 2.35