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Stock-Based Compensation (Tables)

12 Months Ended

Dec. 31, 2021

Share-based Payment Arrangement, Expensed and Capitalized, Amount [Line Items]

Summary of Stock Option Activity

A summary of stock option activity under the 2012 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
Balance as of December 31, 2020			62,827,150			$	4.55				7.8			$	1,208.0
Granted			3,375,940				13.89
Exercised			(9,318,462	)			2.89
Forfeited			(2,359,089	)			6.87
Balance as of December 31, 2021			54,525,539			$	5.30				7.1			$	221.3
Excercisable and vested at December 31, 2021			34,618,347			$	4.02				6.3			$	176.6

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
Balance as of December 31, 2020			32,556,160			$	6.75
Granted			41,969,138				13.30
Vested and converted to common stock			(15,779,232	)			10.21
Forfeited			(4,228,136	)			13.20
Balance as of December 31, 2021			54,517,930			$	10.29

Summary of Share-based Payment Arrangement, Expensed and Capitalized, Amount

Total stock-based compensation expense included in the consolidated statement of operations is as follows (in millions):

		Year Ended December 31,
		2021				2020				2019
Commissions and other related expense		$	128.7			$	5.7			$	16.1
Sales and marketing			38.4				16.0				11.1
Operations and support			16.9				3.5				2.4
Research and development			92.7				1.4				2.8
General and administrative			109.6				16.6				5.0
Total stock-based compensation expense		$	386.3			$	43.2			$	37.4

Summary of share-based payment Award, Stock Options, valuation assumptions

The inputs used below are subjective and require significant judgement to determine. 

		Year Ended December 31,
		2021				2020				2019
Expected term (in years)			6.3				7.0				5.9
Risk-free interest rate			0.9	%			0.8	%			2.3	%
Expected volatility			49.3	%			45.1	%			45.0	%
Dividend rate			—	%			—	%			—	%
Fair value of common stock (range for the period)		$	8.80 - $18.00			$	6.65 - $23.44			$	5.16 - $6.44
Weighted average grant date fair value of options granted		$	8.68			$	5.67			$	2.62

IPO [Member]

Share-based Payment Arrangement, Expensed and Capitalized, Amount [Line Items]

Summary of Share-based Payment Arrangement, Expensed and Capitalized, Amount

The Company has not recognized any tax benefits from stock-based compensation as a result of the full valuation allowance maintained on its deferred tax assets.

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Tabular disclosure of allocation of amount expensed and capitalized for award under share-based payment arrangement to statement of income or comprehensive income and statement of financial position. Includes, but is not limited to, corresponding line item in financial statement.

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Tabular disclosure of the number and weighted-average grant date fair value for restricted stock units that were outstanding at the beginning and end of the year, and the number of restricted stock units that were granted, vested, or forfeited during the year.

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Tabular disclosure for stock option plans. Includes, but is not limited to, outstanding awards at beginning and end of year, grants, exercises, forfeitures, and weighted-average grant date fair value.

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