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Equity Incentive Plans (Tables)
 6 Months Ended
Jun. 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 six months ended June 30, 2021 is as follows:
Options Outstanding
Weighted Average Exercise Price
Balance - December 31, 20209,551,105 $5.55 
Options granted1,015,699 54.65 
Options exercised(530,178)0.77 
Options cancelled and forfeited(139,424)18.81 
Balance - June 30, 20219,897,202 $10.66 
Vested and exercisable, June 30, 2021
2,128,772 $3.44 
Share-based Payment Arrangement, Restricted Stock and Restricted Stock Unit, Activity
The activity of restricted shares of Class A common stock for the six months ended June 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(340,196)1.62
Unvested at June 30, 2021426,445$1.92 
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 six months ended June 30, 2021 is as follows:
Restricted Stock Units
Weighted-Average
Grant Date
Fair Value
Balance at December 31, 2020491,318 $7.91 
Granted253,883 56.66 
Vested
(1,762)43.39
Cancelled
(3,543)19.00
Balance at June 30, 2021
739,896$24.50 
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
June 30,		Six Months Ended
June 30,
2021202020212020
Cost of revenue$344 $— $747 $— 
Research and development1,098 170 2,187 351 
Selling, general and administrative4,989 638 9,535 1,036 
Total stock-based compensation$6,431 $808 $12,469 $1,387