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Stock-Based Employee Compensation - Summary of Stock Option Activity (Details) $ / shares in Units, $ in Thousands	9 Months Ended	12 Months Ended
	Sep. 30, 2021 USD ($) $ / shares shares	Dec. 31, 2020 USD ($) $ / shares shares
Share Based Compensation [Abstract]
Number of options, outstanding, December 31, 2020 | shares	9,933,348
Number of options, granted | shares	633,700
Number of options, exercised | shares	(1,073,448)
Number of options, forfeited | shares	(169,975)
Number of options, expired | shares	(38,111)
Number of options, outstanding, September 30, 2021 | shares	9,285,514	9,933,348
Number of options, exercisable, September 30, 2021 | shares	5,574,039
Number of options, expected to vest, September 30, 2021 | shares	3,711,475
Weighted-average exercise price per share, outstanding, December 31, 2020 | $ / shares	$ 2.16
Weighted-average exercise price per share, granted | $ / shares	8.10
Weighted-average exercise price per share, exercised | $ / shares	1.02
Weighted-average exercise price per share, forfeited | $ / shares	4.46
Weighted-average exercise price per share, expired | $ / shares	2.08
Weighted-average exercise price per share, outstanding, September 30, 2021 | $ / shares	2.66	$ 2.16
Weighted-average exercise price per share, exercisable, September 30, 2021 | $ / shares	1.24
Weighted-average exercise price per share, expected to vest, September 30, 2021 | $ / shares	$ 4.79
Intrinsic value, outstanding, December 31, 2020 | $	$ 129,358
Intrinsic value, outstanding, September 30, 2021 | $	141,393	$ 129,358
Intrinsic value, exercisable, September 30, 2021 | $	92,813
Intrinsic value, expected to vest, September 30, 2021 | $	$ 48,579
Weighted Average Remaining Contractual Term, Outstanding	7 years 2 months 23 days	7 years 9 months 18 days
Weighted Average Remaining Contractual Term, Exercisable	6 years 3 months 25 days
Weighted Average Remaining Contractual Term, Expected to Vest	8 years 7 months 6 days

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The number of shares into which fully or partially vested stock options outstanding as of the balance sheet date can be currently converted under the option plan.

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