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Equity Incentive Plans (Tables)
 9 Months Ended
Sep. 30, 2021
Share-based Payment Arrangement [Abstract]  
Share-based Compensation Arrangement by Share-based Payment Award, Options, Grants in Period, Weighted Average Grant Date Fair Value
Stock option activity for the nine months ended September 30, 2021 is as follows:
Options Outstanding
Weighted Average Exercise Price
Balance - December 31, 20209,551,105 $5.55 
Options granted1,384,227 50.57 
Options exercised(760,383)1.37 
Options cancelled and forfeited(276,880)17.08 
Balance - September 30, 20219,898,069 $11.84 
Vested and exercisable, September 30, 2021
2,600,982 $3.63 
Share-based Payment Arrangement, Restricted Stock and Restricted Stock Unit, Activity
The activity of restricted shares of Class A common stock for the nine months ended September 30, 2021 is as follows:
Number of Shares
Weighted Average
Grant Date
Fair Value
Unvested at December 31, 2020775,641 $1.77 
Granted10,728 1.66 
Repurchased(19,728)1.14
Vested(461,077)1.78
Unvested at September 30, 2021305,564$1.79 
Share-based Payment Arrangement, Restricted Stock Unit, Activity
The Company has granted RSUs under the 2020 RSU Plan and the 2020 Plan. RSU activity for the nine months ended September 30, 2021 is as follows:
Number of Shares
Weighted Average
Grant Date
Fair Value
Balance at December 31, 2020491,318 $7.91 
Granted300,943 53.81 
Vested
(2,192)46.49
Cancelled
(6,752)19.00
Balance at September 30, 2021
783,317$25.34 
Share-based Payment Arrangement, Expensed and Capitalized, Amount
The following table summarizes the components of stock-based compensation recognized in the Company’s condensed consolidated statements of operations and comprehensive loss (in thousands):
Three Months Ended
September 30,		Nine Months Ended
September 30,
2021202020212020
Cost of revenue$523 $— $1,271 $— 
Research and development1,022 210 3,209 561 
Selling, general and administrative5,241 967 14,776 2,003 
Total stock-based compensation$6,786 $1,177 $19,256 $2,564