Equity Incentive Plans (Tables)

12 Months Ended

Dec. 31, 2021

Share-based Payment Arrangement [Abstract]

Schedule of shares and warrants reserved for issuance

The Company's amended and restated certificate of incorporation authorizes the issuance of 700,000,000 shares of common stock with a par value of $0.0001 per share. Shares of common stock reserved for issuance, on an as-converted basis, are as follows:

	December 31,	December 31,
	2020	2021
Options issued and outstanding	19,600,223	12,785,176
RSUs outstanding	—	1,508,615
Shares available for future issuance under 2020 plan	2,537,181	9,979,700
Shares available for issuance under ESPP	—	1,869,302
Warrants to purchase common stock	75,000	—
Total	22,212,404	26,142,793

Summarized Stock Option Activity

The following table summarized stock option activity for the year ended December 31, 2021:

	Number of Options	Weighted-Average Exercise Price Per Share		Weighted-Average Remaining Contractual Life (years)	Aggregate Intrinsic Value
Balances at December 31, 2020	19,600,223	$	4.27	6.8	$	715,084
Options granted	612,384	105.68
Options assumed upon acquisition	23,494	9.06
Options exercised	(7,047,722)	2.09
Options cancelled and forfeited	(403,203)	7.36
Balances at December 31, 2021	12,785,176	10.23		6.8	1,803,812
Options exercisable – December 31, 2021	7,471,578	3.32		5.7	1,105,683
Options vested and expected to vest – December 31, 2021	12,689,220	$	9.97	6.8	$	1,793,628

Summaries of Restricted Stock Units and Restricted Stock

The following table summarized RSU activity for the year ended December 31, 2021:

	Number of Shares	Weighted-Average Grant Date Fair Value Per Share
Unvested at December 31, 2020	—
RSUs granted	1,605,235	$	138.27
RSUs vested	(32,809)	128.30
RSUs cancelled and forfeited	(63,811)	$	100.02
Unvested at December 31, 2021	1,508,615

The following table summarized Restricted Stock activity for the year ended December 31, 2021:

	Number of Shares	Weighted-Average Grant Date Fair Value Per Share
Unvested at December 31, 2020	—
Restricted	82,201	$	121.65
Vested	20,550	$	121.65
Unvested at December 31, 2021	61,651

Stock Options Fair Value Assumptions

The following assumptions were used to estimate the fair value of options granted:

	Year Ended December 31,
	2019	2020	2021
Expected term (in years)	5.5 – 10.0	5.3 – 10.0	5.3 – 6.9
Expected volatility	55.69% – 59.23%	53.23% – 72.02%	45.98% – 65.01%
Risk-free interest rate	1.67% – 2.40%	0.33% – 1.50%	0.62% – 1.34%
Dividend yield	—%	—%	—%

Employee Stock Purchase Plan Fair Value Assumptions

The following assumptions were used to estimate the fair value of ESPP purchase rights:

	Year Ended December 31, 2021
Expected term (in years)	0.5 - 0.6
Expected volatility	61.65% - 152.95%
Risk-free interest rate	0.05% - 0.09%
Dividend yield	—%

Stock-Based Compensation Expense

The Company recorded stock-based compensation in the following expense categories in its consolidated statements of operations and comprehensive income (loss) for employees and nonemployees:

	Year Ended December 31,
	2019		2020		2021
Sales and marketing	$	278	$	1,562	$	6,059
Customer operations	433		898		6,251
Engineering and product development	1,803		4,844		39,191
General, administrative, and other	1,292		4,209		21,685
Total	$	3,806	$	11,513	$	73,186

Stock-based compensation expense by award type was as follows:

	Year Ended December 31,
	2019		2020		2021
Stock options	$	3,806	$	11,513	$	30,985
RSUs	—		—		31,548
ESPP	—		—		7,117
Restricted Stock	—		—		3,536
Total	$	3,806	$	11,513	$	73,186