Quarterly report pursuant to Section 13 or 15(d)

Summary of Unvested Restricted Stock Units (Detail)

v3.20.2
Summary of Unvested Restricted Stock Units (Detail) - Restricted Stock Units (RSUs)
shares in Thousands
9 Months Ended
Sep. 30, 2020
$ / shares
shares
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]  
Beginning Balance | shares 3,564
Granted | shares 2,919
Vested | shares (1,694)
Forfeited or cancelled | shares (962)
Ending Balance | shares 3,827
Unvested RSUs at December 31, 2019 | $ / shares $ 1.68
Granted | $ / shares 0.39
Vested | $ / shares 1.10
Forfeited or cancelled | $ / shares 1.13
Unvested RSUs at September 30, 2020 | $ / shares $ 0.71