Number of annual installments vest.

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Number of eligible employees elected to exchange eligible options.

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Percentage of shares of common stock underlying eligible options.

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Share based compensation arrangement by share based payment award equity instruments other than options grants in period in exchange for cancellation of tendered eligible options.

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Share based compensation arrangement by share based payment award options exercise price eligible options.

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Share based compensation arrangement by share based payment options granted to purchase common stock.

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

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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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Aggregate number of common shares reserved for future issuance.

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Total number of common shares of an entity that have been sold or granted to shareholders (includes common shares that were issued, repurchased and remain in the treasury). These shares represent capital invested by the firm's shareholders and owners, and may be all or only a portion of the number of shares authorized. Shares issued include shares outstanding and shares held in the treasury.

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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 option under share-based payment arrangement.

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The cash inflow associated with the amount received from the stock plan during the period.

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Per share amount received by subsidiary or equity investee for each share of common stock issued or sold in the stock transaction.

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

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Amount of accumulated difference between fair value of underlying shares on dates of exercise and exercise price on options exercised (or share units converted) into shares.

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Intrinsic value of vested award under share-based payment arrangement. Excludes share and unit options.

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Purchase price of common stock expressed as a percentage of its fair value.

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Stockholders' Equity (Deficit) - Share-based Compensation Payment Plans - Additional Information (Details)	1 Months Ended				3 Months Ended		9 Months Ended
	Sep. 30, 2021 USD ($) Employee Installment $ / shares shares	Aug. 31, 2021 shares	May 31, 2021 USD ($) $ / shares shares	Jun. 30, 2020 shares	Sep. 30, 2021 USD ($) shares	Sep. 30, 2020 USD ($)	Sep. 30, 2021 USD ($) shares	Sep. 30, 2020 USD ($)	May 27, 2021 shares	Dec. 31, 2020 shares
Class Of Stock [Line Items]
Exercise price per share \| $ / shares	$ 5.01
Eligible Employees who elected to exchange Eligible Options \| Employee	69
Options granted to purchase an aggregate shares of common stock	4,493,000				4,493,000		4,493,000
Percentage of shares of common stock underlying eligible options	91.50%				91.50%		91.50%
Number of annual installments vest \| Installment	3
Common Stock, Shares, Issued	424,879,000				424,879,000		424,879,000			299,765,000
Share-based payment arrangement, expense \| $					$ 7,300,000	$ 3,100,000	$ 12,800,000	$ 8,500,000
Total unrecognized share based compensation \| $	$ 22,700,000				$ 22,700,000		$ 22,700,000
Share-based compensation over a weighted average period							2 years 2 months 12 days
Restricted Stock Units [Member]
Class Of Stock [Line Items]
Share based compensation arrangement by share based payment award, grants in period in exchange for cancellation of tendered eligible options	700,264
Aggregate intrinsic value of vested and settled \| $							$ 2,100,000
Share-based Payment Arrangement, Option [Member] \| Maximum [Member]
Class Of Stock [Line Items]
Aggregate intrinsic value of options exercised \| $							$ 100,000
2019 Stock Incentive Plan [Member]
Class Of Stock [Line Items]
Number of shares common stock available									22,475,000
2019 Stock Incentive Plan [Member] \| Restricted Stock Units [Member] \| Time-Based Units [Member]
Class Of Stock [Line Items]
Share-based compensation arrangement by share-based payment award, grants in period		2,750,000
2019 Stock Incentive Plan [Member] \| Restricted Stock Units [Member] \| Performance Units [Member]
Class Of Stock [Line Items]
Share-based compensation arrangement by share-based payment award, grants in period		2,750,000
Plan 2019 [Member]
Class Of Stock [Line Items]
Share-based compensation arrangement by share-based payment award, number of shares authorized	10,182,803				10,182,803		10,182,803			2,583,565
Employee Stock Purchase Plan [Member]
Class Of Stock [Line Items]
Number of shares common stock available				5,400,000
Common Stock, Shares, Issued			150,078
Eligible employees to purchase common stock price per share equal to percentage				85.00%
Sale of stock, price Per share \| $ / shares			$ 0.89
Proceeds from stock plans \| $			$ 100,000