Stock-Based Compensation (Tables)

12 Months Ended

Dec. 31, 2021

Disclosure Of Compensation Related Costs Sharebased Payments [Abstract]

Schedule of Share Based Payment Award Stock Options Granted Valuation Assumptions

The assumptions that the Company used to determine the grant date fair value of stock options granted were as follows, presented on a weighted-average basis:

	December 31,
	2021			2020			2019
Risk free interest rate		1.15	%		0.42	%		1.81	%
Expected volatility		48	%		44	%		57	%
Expected dividend yield		0	%		0	%		0	%
Expected term (in years)		6.25			6.45			6.25

Summary of Stock Option Activity for Company's Stock Option Plans

A summary of stock option activity under the Plan, is as follows:

	Stock Options Outstanding
	Number of Shares			Weighted Average Exercise Price (per share)		Weighted Average Remaining Contractual Term (in years)		Aggregate Intrinsic Value (in millions)
Outstanding at December 31, 2020		39,837,195		$	3.49		8.87	$	101
Granted		3,843,666			19.94
Exercised		(3,346,352	)		0.90
Forfeited		(2,462,829	)		5.82
Outstanding at December 31, 2021		37,871,680		$	5.24		8.02	$	846
Exercisable at December 31, 2021		24,466,168		$	3.44		7.53	$	590

Summary of Restricted Stock Activity

A summary of RSA and RSU activity under the 2016 Plan and 2021 Plan is as follows:

	Number of Shares			Weighted average grant date fair value per share
Unvested restricted stock at December 31, 2020		5,410,440		$	4.51
Granted		1,079,864			31.77
Vested		(2,793,436	)		5.38
Forfeited		(28,700	)		34.18
Unvested restricted stock at December 31, 2021		3,668,168		$	11.65