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Summary of Restricted Stock Unit (RSU) Activity (Detail) - Restricted Stock Units (RSUs)
12 Months Ended
Dec. 31, 2019
$ / shares
shares
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]  
Beginning Balance, Number Outstanding | shares 1,367,630
Granted, Number Outstanding | shares 577,682
Vested, Number Outstanding | shares (659,170)
Forfeited, Number Outstanding | shares (138,032)
Ending Balance, Number Outstanding | shares 1,148,110
Shares vested but not released, Number Outstanding | shares 202,940
Beginning Balance, Weighted Average Fair Value | $ / shares $ 3.81
Granted, Weighted Average Fair Value | $ / shares 5.03
Vested, Weighted Average Fair Value | $ / shares 3.62
Forfeited, Weighted Average Fair Value | $ / shares 4.59
Ending Balance, Weighted Average Fair Value | $ / shares 4.43
Shares vested but not released, Weighted Average Fair Value | $ / shares $ 5.27