Stock-based Compensation Expense (Tables)

9 Months Ended

Sep. 30, 2023

Share-Based Payment Arrangement [Abstract]

Schedule of Stock-based Compensation Expense

Stock-based compensation expense included in the condensed consolidated statements of operations was as follows (in thousands):

	Three Months Ended September 30,				Nine Months Ended September 30,
	2023		2022		2023		2022
Infrastructure and trust & safety	$	24,483	$	14,948	$	65,710	$	39,959
Research and development	155,651		111,450		432,676		279,978
General and administrative	32,200		28,327		97,673		82,096
Sales and marketing	7,688		6,634		21,229		18,009
Total stock-based compensation expense	$	220,022	$	161,359	$	617,288	$	420,042

Schedule of Summarizes the Company's Stock Option Activity

The following table summarizes the Company’s stock option activity (in thousands, except per option data and remaining contractual term):

	Options Outstanding
	Number of Shares Subject to Options	Weighted-Average Exercise Price (per Option)		Weighted-Average Remaining Contractual Term (Years)	Aggregate Intrinsic Value
Balances as of December 31, 2022	51,591	$	2.85	6.00	$	1,321,183
Granted	—	—
Cancelled, forfeited, and expired	(667)	$	4.56
Exercised	(7,618)	$	2.32
Balances as of September 30, 2023	43,306	$	2.92	5.30	$	1,127,749
Exercisable as of September 30, 2023	39,231	$	2.73	5.16	$	1,029,013
Vested and expected to vest at September 30, 2023	43,306	$	2.92	5.30	$	1,127,749

Schedule of Company's Restricted Stock Units and Unregistered Restricted Stock Awards Activity

The following table summarizes the Company’s RSU and RSA activity (in thousands, except per share data):

	RSUs			RSAs
	Number of Shares	Weighted-Average Grant Date Fair Value (per Share)		Number of Shares	Weighted-Average Grant Date Fair Value (per Share)
Unvested as of December 31, 2022	30,322	$	48.73	500	$	52.55
Granted	18,876	$	39.48	—	—
Vested and released	(10,231)	$	46.90	(224)	$	50.74
Cancelled	(2,087)	$	49.00	—	—
Unvested as of September 30, 2023	36,880	$	44.48	276	$	54.18

Schedule of Measured Based on an Average of Our Stock Price

The CEO Long-Term Performance Award is divided into seven performance periods that are eligible to vest based on the achievement of various Company Stock Price Hurdles, measured based on an average of our stock price over a consecutive 90-day trading period applicable to the performance period. In addition, Mr. Baszucki must remain employed as our CEO through the date a Company Stock Price Hurdle is achieved in order to earn the RSUs that relate to the applicable Company Stock Price Hurdle. The following table summarizes the various Company Stock Price Hurdles and associated RSUs eligible to vest over each performance period (in thousands, except Company Stock Price Hurdles):

	Company Stock Price Hurdle		Number of RSUs Eligible to Vest	Performance Period Commencement Dates as Measured from the Effective Date
1	$	165.00	750	2 years
2	$	200.00	750	3 years
3	$	235.00	2,000	4 years
4	$	270.00	2,000	5 years
5	$	305.00	2,000	5 years
6	$	340.00	2,000	5 years
7	$	375.00	2,000	5 years