Conversion Of Stock, Conversion Ratio

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Share-based Compensation Arrangement by Share-based Payment Award, Exercisable After Term Of Award, Number

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Share-based Compensation Arrangement by Share-based Payment Award, Options, Re-Measurement Period

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Share-based Payment Arrangement, Expense, Reversal

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Share-Based Payment Arrangement, Number Of Individuals, Granted

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Amount of expense for award under share-based payment arrangement. Excludes amount capitalized.

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Aggregate number of common shares reserved for future issuance.

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Weighted-average period over which cost not yet recognized is expected to be recognized for award under share-based payment arrangement, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents reported fact of one year, five months, and thirteen days.

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Amount of cost to be recognized for nonvested award under share-based payment arrangement. Excludes share and unit options.

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Amount of cost to be recognized for option under share-based payment arrangement.

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Estimated period over which an employee is required to provide service in exchange for the equity-based payment award, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days.

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Period over which grantee's right to exercise award under share-based payment arrangement is no longer contingent on satisfaction of service or performance condition, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents reported fact of one year, five months, and thirteen days. Includes, but is not limited to, combination of market, performance or service condition.

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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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- Definition

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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Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table.

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Number of shares authorized for issuance under share-based payment arrangement.

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- Definition

Amount by which current fair value of underlying stock exceeds exercise price of fully vested and expected to vest options outstanding. Includes, but is not limited to, unvested options for which requisite service period has not been rendered but that are expected to vest based on achievement of performance condition, if forfeitures are recognized when they occur.

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Per share weighted-average price paid for shares purchased on open market for issuance under share-based payment arrangement.

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Maximum number of shares that may be issued in accordance with the plan as a proportion of outstanding capital stock.

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Description of terms of award under share-based payment arrangement.

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Percentage of vesting of award under share-based payment arrangement.

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Period from grant date that an equity-based award expires, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days.

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Stock-Based Compensation - Narrative (Details)			3 Months Ended		9 Months Ended
Stock-Based Compensation - Narrative (Details)	May 02, 2022 $ / shares shares	Jul. 22, 2021 shares	Sep. 30, 2022 USD ($) $ / shares shares	Sep. 30, 2021 USD ($)	Sep. 30, 2022 USD ($) shares	Sep. 30, 2022 USD ($) shares	Sep. 30, 2022 USD ($) shares	Sep. 30, 2022 USD ($) $ / shares shares	Sep. 30, 2022 USD ($) shares	Sep. 30, 2022 USD ($) employee shares	Sep. 30, 2022 USD ($) consultant shares	Sep. 30, 2021 USD ($)
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Weighted average price of shares purchased (in usd per share)	$ 2.20
Unvested company stock option \| $			$ 900,000		$ 900,000	$ 900,000	$ 900,000	$ 900,000	$ 900,000	$ 900,000	$ 900,000
Total stock-based compensation expense \| $			$ 1,273,000	$ 18,011,000			$ 41,553,000					$ 182,454,000
Share-based Payment Arrangement, Tranche One
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Restricted stock units granted (in us dollar)								$ 1.82
Restricted stock units forfeited (in us dollar)			$ 0.00
Share-based Payment Arrangement, Tranche Two
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Restricted stock units granted (in us dollar)								1.39
Restricted stock units forfeited (in us dollar)			0.00
Share-based Payment Arrangement, Tranche Three
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Restricted stock units granted (in us dollar)								$ 0.94
Restricted stock units forfeited (in us dollar)			$ 0.00
2017 Stock Incentive Plan
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Fair value re-measurement period for the liability awards					6 months
2021 Plan
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Number of options granted \| shares		0
Weighted average remaining contractual life (years), options exercisable		10 years
Vesting period		4 years
Number of share issuance (in shares) \| shares		32,734,983
2021 Employee Stock Purchase Plan \| Employee Stock Purchase Plan
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Number of share issuance (in shares) \| shares			7,229,799		7,229,799	7,229,799	7,229,799	7,229,799	7,229,799	7,229,799	7,229,799
Number of shares equal to percent									1.00%
Options to purchase common stock
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Weighted average remaining contractual life (years), options exercisable	10-year
Unrecognized stock-based compensation cost on the unvested stock options \| $			$ 18,200,000		$ 18,200,000	$ 18,200,000	$ 18,200,000	$ 18,200,000	$ 18,200,000	$ 18,200,000	$ 18,200,000
Weighted-average vesting period for compensation cost					1 year 9 months 7 days
Options to purchase common stock \| Employee \| Class A common stock
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Newly hired employees (in shares) \| shares	4,932,132
Options to purchase common stock \| 2017 Stock Incentive Plan
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Number of options granted \| shares						0
Weighted average remaining contractual life (years), options exercisable					10 years
Vesting period					4 years
Restricted Stock Units (RSUs)
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Vesting period					4 years
Weighted-average vesting period for compensation cost					1 year 9 months 21 days
Stock conversion ratio			1		1	1	1	1	1	1	1
Restricted stock units granted (in shares) \| shares						18,129,226
Unvested company stock option \| $			$ 47,200,000		$ 47,200,000	$ 47,200,000	$ 47,200,000	$ 47,200,000	$ 47,200,000	$ 47,200,000	$ 47,200,000
Restricted stock units granted (in us dollar)								$ 2.44
Restricted stock units forfeited (in us dollar)								$ 6.13
Restricted Stock Units (RSUs) \| Board of Directors Chairman
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Restricted stock units granted (in shares) \| shares						126,980
Restricted Stock Units (RSUs) \| Share-based Payment Arrangement, Tranche One
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Vesting commencement date					12 months
Restricted Stock Units (RSUs) \| Employee
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Newly hired employees (in shares) \| shares	4,285,208
Options and RSUs \| Share-based Payment Arrangement, Tranche One
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Percentage of converted share	25.00%
Options and RSUs \| Share-based Payment Arrangement, Tranche Two
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Percentage of converted share	25.00%
Options and RSUs \| Share-based Payment Arrangement, Tranche Three
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Percentage of converted share	25.00%
Stock Appreciation Rights (SARs)
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Number of shares granted (in shares)										1	1
Total stock-based compensation expense \| $							3,800,000
Outstanding vested value \| $			0		$ 0	$ 0	0	$ 0	$ 0	$ 0	$ 0
Share-based payment arrangement, expense, reversal \| $			$ 17,300,000				$ 27,000,000.0