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Stock-based Compensation (Tables)

9 Months Ended

Sep. 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 September 30,												Nine Months Ended September 30,
			2021						2020						2021						2020
Cost of revenue			$	764					$	48					$	1,585					$	131
Sales and marketing			6,356						163						11,706						950
Technology and development			14,446						600						32,591						2,153
General and administrative			16,499						2,118						41,079						7,383
Total stock-based compensation expense			38,065						2,929						86,961						10,617
Amount capitalized to internal-use software			9						12						35						35
Total stock-based compensation			$	38,074					$	2,941					$	86,996					$	10,652

Schedule of Stock Options Activity

Stock option activity for the nine months ended September 30, 2021 is as follows (in thousands, except weighted-average exercise price and remaining contractual 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			(539)						0.71
Cancelled/forfeited			(95)						4.40
Outstanding at September 30, 2021			15,572						$	10.28					8.2						$	252,542
Vested and expected to vest at September 30, 2021			15,544						$	10.29					8.2						$	251,962
Exercisable at September 30, 2021			6,501						$	8.31					7.6						$	117,605

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 September 30,												Nine Months Ended September 30,
			2021						2020						2021						2020
Expected life (years)			—						5.3						5.4						5.2
Risk-free interest rate			—		%				0.3		%				1.0		%				1.3		%
Expected volatility			—		%				47		%				46		%				44		%
Expected dividend yield			—		%				—		%				—		%				—		%

Summary of Restricted Stock Unit Activity

Restricted stock unit, or RSU, activity for the nine months ended September 30, 2021 is as follows (in thousands, except weighted-average grant-date fair value):

			Number of Shares						Weighted- Average Grant- Date Fair Value
Unvested at December 31, 2020			2,499						$	9.53
Granted			1,978						18.87
Cancelled/forfeited			(201)						11.29
Vested			(662)						19.34
Unvested at September 30, 2021			3,614						$	20.60

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