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Stockholders' Equity (Tables)

12 Months Ended

Dec. 31, 2022

Equity [Abstract]

Schedule of Class A Common Stock Available for Future Issuance

The Company had reserved the following shares of Class A common stock for future issuance:

(in thousands)
As of December 31,						2022						2021
Shares outstanding from stock options and restricted stock units						13,517						10,261
Shares available for future equity award grants						7,554						3,679
Shares available for future ESPP offerings						201						841
Total shares reserved						21,272						14,781

Schedule of Stock Options Roll Forward

A summary of the Company’s stock option activity for its Plans is as follows:

						Outstanding Stock Options (in thousands)						Weighted Average Exercise Price						Weighted Average Contractual Life (Years)						Aggregate Intrinsic Value (in millions)
Balance as of December 31, 2021						6,443						$8.84						6.5						$45.3
Granted						1,324						$10.70
Exercised						(1,346)						$5.93
Cancelled/forfeited						(309)						$10.38
Balance as of December 31, 2022						6,112						$9.81						6.7						$11.9
Vested and exercisable as of December 31, 2022						3,861						$8.03						5.6						$11.2

Schedule of Share-based Payment Award, Stock Options, Valuation Assumptions

The per-share fair value of each stock option was determined on the date of grant using the following weighted-average assumptions and ranges of fair value of common stock:

Year Ended December 31,						2022						2021						2020
Expected volatility						52.5		%				53.7		%				52.2		%
Expected term (in years)						6.0						6.0						6.1
Expected dividend yield						0		%				0		%				0		%
Risk-free interest rate						2.6		%				1.1		%				0.6		%

Schedule of Outstanding Nonvested RSUs

A summary of the Company’s outstanding nonvested RSUs for its Plans is as follows:

						Number of Units (in thousands)						Weighted-Average Grant Date Fair Value
Nonvested as of December 31, 2021						3,818						$	18.07
Granted						6,416						$	10.47
Vested						(1,521)						$	16.12
Forfeited						(1,308)						$	15.65
Nonvested as of December 31, 2022						7,405						$	12.27

Schedule of Share-based Payment Award, Employee Stock Purchase Plan, Valuation Assumptions

The fair value of purchase rights granted under the ESPP were determined on the date of grant using the following weighted-average assumptions:

Year Ended December 31,						2022						2021
Expected volatility						59.6		%				49.8		%
Expected term (in years)						1.0						1.4
Expected dividend yield						0		%				0		%
Risk-free interest rate						2.8		%				0.4		%

Schedule of Stock-based Compensation Expense

The Company recognized stock-based compensation under the Plans and ESPP as follows:

(in millions)
Year Ended December 31,						2022						2021						2020
Research and development						$	12.0					$	6.8					$	3.1
Sales and marketing						12.4						5.8						1.9
General and administrative						10.0						5.3						1.4
Total						$	34.4					$	17.9					$	6.4

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