v3.20.4
Stock-Based Compensation - 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]  
Unvested and Outstanding Beginning Balance | shares 179,494,619
RSUs granted | shares 98,667,215
RSUs vested | shares (82,429,575)
RSUs canceled | shares (10,862,021)
Unvested and Outstanding Ending Balance | shares 184,870,238
Weighted Average Grant Date Fair Value per Share Beginning Balance | $ / shares $ 6.03
RSUs granted | $ / shares 8.15
RSUs vested | $ / shares 6.45
RSUs canceled | $ / shares 6.06
Weighted Average Grant Date Fair Value per Share Ending Balance | $ / shares $ 6.97