Quarterly report pursuant to Section 13 or 15(d)

Summary of Unvested Restricted Stock Units (Detail)

v3.21.2
Summary of Unvested Restricted Stock Units (Detail) - Restricted Stock Units (RSUs)
shares in Thousands
9 Months Ended
Sep. 30, 2021
$ / shares
shares
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]  
Beginning Balance | shares 3,672
Granted | shares 2,808
Vested | shares (3,772)
Forfeited or cancelled | shares (601)
Ending Balance | shares 2,107
Unvested RSUs at December 31, 2020 | $ / shares $ 0.66
Granted | $ / shares 0.83
Vested | $ / shares 0.69
Forfeited or cancelled | $ / shares 1.33
Unvested RSUs at September 30, 2021 | $ / shares $ 0.63