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Stock-based Compensation (Tables)

6 Months Ended

Jun. 30, 2021

Share-based Payment Arrangement [Abstract]

Schedule of Stock Based Compensation Cost

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

		Three Months Ended June 30								Six Months Ended June 30
		2021				2020				2021				2020
Cost of revenue		$	762			$	46			$	821			$	83
Sales and marketing			5,143				144				5,350				787
Technology and development			17,619				603				18,145				1,553
General and administrative			21,430				2,568				24,580				5,265
Total stock-based compensation expense			44,954				3,361				48,896				7,688
Amount capitalized to internal-use software			13				8				26				23
Total stock-based compensation		$	44,967			$	3,369			$	48,922			$	7,711

Schedule of Stock Options Activity

Stock option activity for the six months ended June 30, 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			(456	)			0.63
Cancelled/forfeited			(84	)			4.81
Outstanding at June 30, 2021			15,666			$	10.23				8.4			$	432,727
Vested and expected to vest at June 30, 2021			15,628			$	10.24				8.4			$	431,496
Exercisable at June 30, 2021			5,637			$	7.99				7.7			$	168,307

Schedule of Fair Value Assumptions and Techniques for Stock Options

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

		Three Months Ended June 30								Six Months Ended June 30
		2021				2020				2021				2020
Expected life (years)			5.4				—				5.4				5.1
Risk-free interest rate			0.97	%			—				0.97	%			1.62	%
Expected volatility			45.6	%			—				45.6	%			43.1	%
Expected dividend yield			0.0	%			—				0.0	%			0.0	%

Summary of Restricted Stock Unit Activity

A summary of restricted stock unit, or RSU, activity for the six months ended June 30, 2021 is as follows (in thousands, except weighted-average grant-date fair value):

		Number of Options				Weighted- Average Grant- Date Fair Value
Unvested at December 31, 2020			2,499			$	9.53
Granted			1,771				16.51
Cancelled/forfeited			(145	)			10.78
Vested			(330	)			21.29
Unvested at June 30, 2021			3,795			$	19.20

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Tabular disclosure of employee stock purchase plan activity.

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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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