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Equity Incentive Plan - Schedule of Stock Option Activity Under 2019 Plan (Detail) - 2019 Plan [Member]
12 Months Ended
Dec. 31, 2019
$ / shares
shares
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]  
Options granted | shares 514,710
Options outstanding, ending balance | shares 514,710
Options vested and expected to vest | shares 514,710
Weighted average exercise price, granted | $ / shares $ 9.90
Weighted average exercise price, ending balance | $ / shares 9.90
Weighted average exercise price, vested and expected to vest | $ / shares $ 9.90
Weighted average remaining contractual term, balance 10 years
Weighted average remaining contractual term, vested and expected to vest 10 years
Weighted average remaining contractual term, exercisable 10 years