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Stockholders' Equity - Summary of RSU and RSA Activity (Details) - Restricted Stock Units and Restricted Stock Awards shares in Thousands	9 Months Ended
	Sep. 30, 2021 $ / shares shares
Weighted-Average Grant Date Fair Value per Restricted Stock
Weighted-Average Grant Date Fair Value per Restricted Stock, Unvested Beginning Balance | $ / shares	$ 15.10
Weighted-Average Grant Date Fair Value per Restricted Stock, Granted | $ / shares	59.13
Weighted-Average Grant Date Fair Value per Restricted Stock, Vested | $ / shares	15.64
Weighted-Average Grant Date Fair Value per Restricted Stock, Forfeited | $ / shares	15.04
Weighted-Average Grant Date Fair Value per Restricted Stock, Unvested Ending Balance | $ / shares	$ 23.19
Class A Common Stock
Outstanding Restricted Stock
Outstanding Restricted Stock, Unvested Beginning Balance | shares	131,172
Outstanding Restricted Stock, Granted | shares	18,168
Outstanding Restricted Stock, Vested | shares	(45,486)
Outstanding Restricted Stock, Forfeited | shares	(7,980)
Outstanding Restricted Stock, Unvested Ending Balance | shares	95,874

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Share based compensation arrangement by share based payment award equity instruments other than options rollforward.

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The number of equity-based payment instruments, excluding stock (or unit) options, that were forfeited during the reporting period.

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Weighted average fair value as of the grant date of equity-based award plans other than stock (unit) option plans that were not exercised or put into effect as a result of the occurrence of a terminating event.

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The number of grants made during the period on other than stock (or unit) option plans (for example, phantom stock or unit plan, stock or unit appreciation rights plan, performance target plan).

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The weighted average fair value at grant date for nonvested equity-based awards issued during the period on other than stock (or unit) option plans (for example, phantom stock or unit plan, stock or unit appreciation rights plan, performance target plan).

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The number of non-vested equity-based payment instruments, excluding stock (or unit) options, that validly exist and are outstanding as of the balance sheet date.

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Per share or unit weighted-average fair value of nonvested award under share-based payment arrangement. Excludes share and unit options.

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