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Summary of RSU Activity (Detail) - Restricted Stock Units
12 Months Ended
Dec. 31, 2020
$ / shares
shares
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]  
Beginning Balance, Unvested, Number Outstanding | shares 1,148,110
Granted, Number Outstanding | shares 508,928
Vested, Number Outstanding | shares (726,968)
Forfeited, Number Outstanding | shares (247,507)
Ending Balance, Unvested, Number Outstanding | shares 682,563
Shares vested but not released, Number Outstanding | shares 298,100
Beginning Balance, Unvested, Weighted Average Fair Value | $ / shares $ 4.43
Granted, Weighted Average Fair Value | $ / shares 4.28
Vested, Weighted Average Fair Value | $ / shares 4.31
Forfeited, Weighted Average Fair Value | $ / shares 4.71
Ending Balance, Unvested, Weighted Average Fair Value | $ / shares 4.34
Shares vested but not released, Weighted Average Fair Value | $ / shares $ 5.05