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Summary of Restricted Stock and Restricted Stock Unit (RSU) Activity (Detail) - Restricted Stock and Restricted Stock Units
3 Months Ended
Mar. 31, 2017
$ / shares
shares
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]  
Beginning Balance, Number Outstanding | shares 1,973,459
Granted, Number Outstanding | shares 90,000
Vested, Number Outstanding | shares (110,568)
Forfeited, Number Outstanding | shares (30,780)
Ending Balance, Number Outstanding | shares 1,922,111
Shares vested but not released, Number Outstanding | shares 43,018
Beginning Balance, Weighted Average Fair Value | $ / shares $ 2.80
Granted, Weighted Average Fair Value | $ / shares 5.53
Vested, Weighted Average Fair Value | $ / shares 5.37
Forfeited, Weighted Average Fair Value | $ / shares 3.18
Ending Balance, Weighted Average Fair Value | $ / shares 2.77
Shares vested but not released, Weighted Average Fair Value | $ / shares $ 2.53