Stockholders' Equity (Tables)

3 Months Ended

Mar. 31, 2022

Equity [Abstract]

Stock-Based Compensation Expense Related to Grants of Employee Stock Options, Restricted Stock Units (RSUs) and Performance and Market Based Awards

We recorded stock-based compensation expense related to grants of employee stock options, restricted stock units (“RSUs”) and performance and market-based awards in our consolidated statements of operations as follows (in millions):

	Three Months Ended March 31,
	2022		2021
Cost of revenue	$	0.7	$	0.6
Research and development		31.0		24.3
Sales and marketing		4.8		3.9
General and administrative		8.5		8.4
Total stock-based compensation expense	$	45.0	$	37.2

Schedule of Share Based Compensation Stock Option Activity

The following table shows stock option activity for the three months ended March 31, 2022 (in millions, except weighted-average exercise price and weighted-average contractual term):

	Outstanding Options
						Aggregate		Weighted-
				Weighted-Average		Intrinsic Value of		Average
				Exercise Price		Stock Options		Contractual Term
	Stock Options			(per option)		Outstanding		(in years)
Balance as of December 31, 2021		22.7		$	3.56	$	64.9		5.71
Granted		—			—
Forfeited, expired and cancelled		—			—
Exercised		(0.2	)		3.21
Balance as of March 31, 2022		22.5		$	3.56	$	127.8		5.37

Schedule of Share Based Compensation Restricted Stock Units Award Activity

The following table shows a summary of RSU activity for the three months ended March 31, 2022, which includes performance and market-based awards (in millions, except weighted-average grant date fair value):

	Outstanding RSUs
				Weighted-Average		Aggregate
				Grant Date Fair Value		Intrinsic Value of
	Shares			(per share)		Unvested RSUs
Unvested as of December 31, 2021		62.4		$	8.68	$	399.4
Granted		17.6			8.86
Vested		(5.8	)		8.30
Forfeited		(1.5	)		8.50
Unvested as of March 31, 2022		72.7		$	8.76	$	671.7