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Summary of Unvested Restricted Stock Units (Detail) - Restricted Stock Units (RSUs)
6 Months Ended
Jun. 30, 2022
$ / shares
shares
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]  
Beginning Balance | shares 94,000
Granted | shares 299,000
Vested | shares (4,000)
Forfeited or cancelled | shares (5,000)
Ending Balance | shares 384,000
Unvested RSUs at December 31, 2021 | $ / shares $ 15.64
Granted | $ / shares 4.19
Vested | $ / shares 27.10
Forfeited or cancelled | $ / shares 16.63
Unvested RSUs at June 30, 2022 | $ / shares $ 6.59