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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, 2018
$ / shares
shares
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]  
Unvested beginning balance, Number Outstanding | shares 1,460,044
Granted, Number Outstanding | shares 352,969
Vested, Number Outstanding | shares (156,013)
Forfeited, Number Outstanding | shares (114,510)
Unvested ending balance, Number Outstanding | shares 1,542,490
Shares vested but not released, Number Outstanding | shares 329,056
Unvested beginning balance, Weighted Average Fair Value | $ / shares $ 3.08
Granted, Weighted Average Fair Value | $ / shares 3.71
Vested, Weighted Average Fair Value | $ / shares 3.60
Forfeited, Weighted Average Fair Value | $ / shares 2.67
Unvested ending balance, Weighted Average Fair Value | $ / shares 3.20
Shares vested but not released, Weighted Average Fair Value | $ / shares $ 2.77