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Stock-Based Compensation (Tables)
3 Months Ended
Mar. 31, 2021
Share-based Payment Arrangement [Abstract]  
Summary of Stock Option Activity
A summary of stock option activity under the 2012 Plan and the 2021 Plan, including 1,061,250 stock options that were granted outside of the 2012 Plan in 2019, is presented below (in millions, except share and per share amounts):
 
   
Number of
Shares
   
Weighted
Average
Exercise
Price
   
Weighted Average
Remaining
Contract
Term
(in years)
   
Aggregate
Intrinsic
Value
 
Balances as of December 31, 2020
   62,827,150   $4.55    7.8   $1,208.0 
Granted
   1,888,660    11.04           
Exercised
   (4,710,490   3.05           
Forfeited
   (401,930   6.35           
   
 
 
                
Balances as of March 31, 2021
   59,603,390   $4.86    7.7   $780.0 
   
 
 
                
Exercisable and vested at March 31, 2021
   32,491,554   $3.47    6.6   $470.6 
   
 
 
                
Summary of Restricted Stock Units Activity
A summary of RSU activity under the 2012 Plan and the 2021 Plan is presented below:
 
   
Number of
Shares
   
Weighted
Average Grant
Date Fair Value
 
Balances as of December 31, 2020
   32,556,160   $6.75 
Granted
   18,088,710    12.61 
Vested and converted to common stock
   —      —   
Forfeited
   (371,945   11.80 
   
 
 
   
 
 
 
Balances as of March 31, 2021
   50,272,925   $8.82 
   
 
 
   
 
 
 
Summary of Share-based Payment Arrangement, Expensed and Capitalized, Amount
Total stock-based compensation expense included in the condensed consolidated statements of operations is as follows (in millions):
 
   
Three Months Ended March 31, 2021
   
Three
Months
Ended
 
   
IPO Related
Expense
   
Other
Expense
   
Total
   
March 31,
2020
 
Commissions and other related expense
  $41.7   $2.9   $44.6   $4.1 
Sales and marketing
   1.8    7.2    9.0    2.9 
Operations and support
   3.1    1.9    5.0    0.8 
Research and development
   46.9    2.6    49.5    0.5 
General and administrative
   55.0    4.4    59.4    2.8 
   
 
 
   
 
 
   
 
 
   
 
 
 
Total stock-based compensation expense
  $148.5   $19.0   $167.5   $11.1