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Stock-based Compensation (Tables)
 3 Months Ended
Mar. 31, 2022
Share-based Payment Arrangement [Abstract]  
Summary of Stock-based Compensation Expense
Stock-based compensation expense included in the condensed consolidated statements of operations data above was as follows (in thousands):
 Three Months Ended March 31,
 20222021
Infrastructure and trust & safety$11,356 $5,688 
Research and development74,814 31,594 
General and administrative20,795 11,247 
Sales and marketing5,330 2,215 
Total stock-based compensation$112,295 $50,744 
Summary of Summarizes the Company's Stock Option Activity
The following table summarizes the Company’s stock option activity (in thousands except per share data and remaining contractual term):
 Options Outstanding
 Number of
Shares
Subject to
Options		Weighted-
Average
Exercise
Price		Remaining
Contractual
Term
(Years)		Aggregate
Intrinsic
Value
Balances as of December 31, 202163,267 $2.82 6.97$6,348,395 
Granted— — 
Cancelled(432)$3.74 
Exercised(4,150)$2.48 
Balances as of March 31, 202258,685 $2.85 6.74$2,547,170 
Vested and exercisable as of March 31, 2022
35,468 $2.02 6.05$1,569,430 
Vested and expected to vest at March 31, 2022
58,685 $2.85 6.74$2,547,170 
Summary of Company's Restricted Stock Units and Unregistered Restricted Stock Awards Activity
The following table summarizes the Company’s restricted stock units and unregistered restricted stock awards (unregistered RSAs) activity (in thousands except per share data):
 Restricted Stock UnitsRestricted Stock Awards
 Number of
Shares		Weighted-
Average
grant date
fair value		Number of
Shares		Weighted-
Average
grant date
fair value
Unvested as of December 31, 202114,684 $68.03 468 $57.37 
Granted1,777 $54.71 — — 
Released(1,808)$70.31 (32)$37.75 
Cancelled(164)$66.12 — — 
Unvested as of March 31, 202214,489 $66.13 436 $58.80 
Summary of Measured Based on An Average of Our Stock Price The CEO Long-Term Performance Award is divided into seven tranches that are eligible to vest based on the achievement of stock price goals, each a Company Stock Price Hurdle, measured based on an average of our stock price over a consecutive 90-day trading period applicable to the performance period as set forth below.
Company Stock
Price Hurdle		Number of RSUs
Eligible to Vest		Performance
Period
Commencement
Dates as Measured
from the Effective
Date
1$165.00 750,000 2 years
2$200.00 750,000 3 years
3$235.00 2,000,000 4 years
4$270.00 2,000,000 5 years
5$305.00 2,000,000 5 years
6$340.00 2,000,000 5 years
7$375.00 2,000,000 5 years
Summary of Employee Stock Purchase Plan
The following table summarizes the weighted-average assumptions used in estimating the fair value of 2020 ESPP for the offering period in effect using the Black-Scholes option-pricing model:
 
 Three Months Ended
 March 31, 2022
Risk-free interest rate0.71%-1.55%
Expected volatility54.16%-60.1%
Dividend yield—%
Expected terms (in years)0.50-2.00