Stockholders' Equity (Tables)

12 Months Ended

Dec. 31, 2022

Equity [Abstract]

Summary of stock option activity

A summary of the Company’s stock option activity for the year ended December 31, 2022 is as follows:

	Number of Shares	Weighted-Average Exercise Price		Weighted-Average Remaining Contractual Life (Years)	Aggregate Intrinsic Value
					(In thousands)
Outstanding at December 31, 2021	14,924,013	$	25.11	7.9	$	439,557
Granted	6,710,394	41.36
Exercised	(2,014,629)	3.76
Forfeited	(773,193)	50.28
Cancelled	(38,559)	35.71
Outstanding at December 31, 2022	18,808,026	$	32.13	7.9	$	188,241
Exercisable at December 31, 2021	6,694,592	$	4.21	6.6	$	308,893
Exercisable at December 31, 2022	8,015,001	$	15.21	6.3	$	169,601

Schedule of assumptions used in the option-pricing model for options granted

Certain assumptions used in the option-pricing model for options granted to employees, directors, and non-employees are as follows:

	Year Ended December 31,
	2022	2021	2020
Expected term (in years)	4.61 - 6.11	3.00 - 6.11	5.50 - 6.11
Risk-free interest rate	1.4% - 4.4%	0.6% - 1.4%	0.3% - 1.7%
Expected volatility	49.3% - 53.3%	52.4% - 59.5%	49.2% - 54.7%
Expected dividend rate	—	—	—

Summary of restricted stock unit activity

A summary of the Company’s restricted stock unit activity is as follows:

	Number of Shares	Weighted-Average Grant Date Fair Value
Outstanding at December 31, 2021	1,765,518	$	53.25
Granted	1,412,850	$	44.09
Vested	(572,911)	$	49.78
Forfeited	(189,295)	$	52.82
Outstanding at December 31, 2022	2,416,162	$	48.74

Summary of purchases made for each purchase period, employee stock purchase plan

The following table summarizes the purchases that were made for each purchase period of the ESPP through December 31, 2022 (in thousands, except for share amounts):

Purchase Period	Proceeds used for purchase		Shares purchased
October 25, 2019 to July 31, 2020	$	1,146	103,677
August 1, 2020 to January 31, 2021	481		21,125
February 1, 2021 to July 31, 2021	595		14,505
August 1, 2021 to January 31, 2022	683		19,838
February 1, 2022 to July 31, 2022	412		15,888

Summary of stock based compensation expense for employees

The following table summarizes stock-based compensation expense, which was included in the statements of operations as follows (in thousands):

	Year Ended December 31,
	2022		2021		2020
Cost of services	$	25,918	$	8,969	$	3,056
Sales and marketing	21,135		5,462		2,066
General and administrative	53,695		19,275		7,699
Total stock-based compensation expense	$	100,748	$	33,706	$	12,821