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Stock-based Compensation (Tables)

12 Months Ended

Dec. 31, 2021

Share-based Payment Arrangement [Abstract]

Schedule of Stock Based Compensation Cost

We recorded stock-based compensation expense in the following categories in the accompanying consolidated statements of operations and balance sheets (in thousands):

			Year Ended December 31,
			2021						2020						2019
Cost of revenue			$	1,733					$	177					$	205
Sales and marketing			15,746						1,122						1,020
Technology and development			38,796						2,703						1,314
General and administrative			56,557						9,719						4,170
Total stock-based compensation expense			112,832						13,721						6,709
Amount capitalized to internal-use software			674						46						98
Total stock-based compensation expense			$	113,506					$	13,767					$	6,807

Schedule of Stock Options Activity

Stock option activity for the year ended December 31, 2021 is as follows (in thousands, except weighted-average exercise price and remaining contract life):

			Number of Options						Weighted- Average Exercise Price						Weighted- Average Remaining Contractual Life (in Years)						Aggregate Intrinsic Value
Outstanding at December 31, 2020			15,235						$	8.78					8.7						$	15,873
Granted			971						28.00
Exercised			(831)						0.65
Cancelled/forfeited			(101)						4.24
Outstanding at December 31, 2021			15,274						$	10.47					8.0						$	97,094
Vested and expected to vest at December 31, 2021			15,253						$	10.48					8.0						$	96,889
Exercisable at December 31, 2021			7,074						$	8.79					7.6						$	51,533

Schedule of Fair Value Assumptions and Techniques for Stock Options

The weighted-average assumptions that were used to calculate the grant-date fair value of our stock option grants using the Black-Scholes option pricing model were as follows:

			Year Ended December 31,
			2021						2020						2019
Expected life (years)			5.4						5.2						5.1
Risk-free interest rate			1.0		%				1.1		%				1.5		%
Expected volatility			46		%				45		%				44		%
Expected dividend yield			—						—						—

Summary of Restricted Stock Unit Activity

Restricted Stock Units

A summary of RSU activity for the year ended December 31, 2021 is as follows (in thousands, except weighted-average grant-date fair value):

			Number of Units						Weighted- Average Grant- Date Fair Value (1)
Unvested at December 31, 2020			2,499						$	9.53
Granted			2,276						19.80
Cancelled/forfeited			(315)						12.25
Vested			(883)						18.60
Unvested at December 31, 2021			3,577						$	21.52

(1) Includes weighted average grant date and modification date fair values.

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Tabular disclosure of employee stock purchase plan activity.

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Tabular disclosure of the significant assumptions used during the year to estimate the fair value of stock options, including, but not limited to: (a) expected term of share options and similar instruments, (b) expected volatility of the entity's shares, (c) expected dividends, (d) risk-free rate(s), and (e) discount for post-vesting restrictions.

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