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Stockholders’ Equity (Tables)
 9 Months Ended
Sep. 30, 2022
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,September 30,
20212022
Options issued and outstanding12,785,176 11,723,427 
RSUs outstanding1,508,615 4,679,719 
PRSUs outstanding— 687,500 
Shares available for future issuance under 2020 plan9,979,700 8,920,902 
Shares available for issuance under ESPP1,869,302 2,543,089 
Total26,142,793 28,554,637 
Summarized stock option activity
The following table summarizes stock option activity for the nine months ended September 30, 2022:
Number of OptionsWeighted-Average Exercise Price Per ShareWeighted-Average Remaining Contractual Life (years)Aggregate
Intrinsic
Value
Balances at December 31, 202112,785,176 $10.23 6.8$1,803,812 
Options granted1,253,496 46.63 
Options exercised(2,074,763)5.19 
Options cancelled and forfeited(240,482)25.79 
Balances at September 30, 202211,723,427 14.70 6.4151,680 
Options exercisable – September 30, 20227,590,584 4.96 5.3124,319 
Options vested and expected to vest – September 30, 202211,663,853 $14.37 6.4$151,478 
Summaries of restricted stock units and restricted stock The following table summarizes RSU activity for the nine months ended September 30, 2022:
Number of SharesWeighted-Average Grant Date Fair Value Per Share
Unvested at December 31, 20211,508,615$140.10 
RSUs granted3,778,85147.64 
RSUs vested(368,604)130.64 
RSUs cancelled and forfeited(239,143)114.46 
Unvested at September 30, 20224,679,719$67.50 
The following table summarized Restricted Stock activity for the nine months ended September 30, 2022:

Number of SharesWeighted-Average Grant Date Fair Value Per Share
Unvested at December 31, 202161,651$121.65 
Vested30,825121.65 
Unvested at September 30, 202230,826$121.65 
Stock options fair value assumptions
The following assumptions were used to estimate the fair value of options granted:

Three Months Ended September 30,Nine Months Ended September 30,
2021202220212022
Expected term (in years)
5.8 – 6.7
5.1 – 6.1
5.3 – 6.9
5.1 – 7.0
Expected volatility
63.03% – 63.53%
49.66% – 50.73%
63.03% – 65.01%
47.58% – 50.73%
Risk-free interest rate
0.93% – 0.93%
3.28% – 4.02%
0.62% – 1.14%
1.70% – 4.02%
Dividend yield—%—%—%—%
Employee stock purchase plan fair value assumptions
The following assumptions were used to estimate the fair value of the February 2022 PRSUs granted:

Expected term (in years)
6.9
Expected volatility
48.43%
Risk-free interest rate
1.89%
Dividend yield
—%

The following assumptions were used to estimate the fair value of ESPP purchase rights:
Three Months Ended September 30,Nine Months Ended September 30,
2021202220212022
Expected term (in years)0.50.5
0.5 – 0.6
0.5
Expected volatility152.95%179.35%
61.65% – 152.95%
91.98% – 179.35%
Risk-free interest rate0.05%3.13%
0.05% – 0.09%
0.72% – 3.13%
Dividend yield—%—%—%—%
Stock-based compensation expense The Company recorded stock-based compensation in the following expense categories in its condensed consolidated statements of operations and comprehensive income (loss) for employees and nonemployees:
Three Months Ended
September 30,		Nine Months Ended
September 30,
2021202220212022
Sales and marketing$1,771 $3,028 $3,951 $7,890 
Customer operations1,938 2,682 4,314 6,386 
Engineering and product development10,273 21,726 27,052 53,254 
General, administrative, and other6,335 9,220 14,808 24,505 
Total$20,317 $36,656 $50,125 $92,035