Redeemable Convertible Preferred Stock and Stockholders' Equity (Deficit) - Additional Information (Details) - USD ($)		1 Months Ended		3 Months Ended	12 Months Ended
	Oct. 12, 2018	Oct. 31, 2018	May 31, 2018	Dec. 31, 2020	Dec. 31, 2020	Dec. 31, 2019
Class Of Stock [Line Items]
Preferred stock, shares issued				0	0	0
Issuance costs					$ 4,937,000
Cumulative preferential dividends entitlement as percentage of annual rate of original issue price of each share of preferred stock					10.00%
Cumulative preferred dividends paid in arrears		$ 6,400,000	$ 18,600,000
Offering price per share				$ 5.94	$ 5.94
Charitable stock donation				$ 41,700,000	$ 41,721,000
Percentage of discount rate				13.00%
Redeemable Convertible Preferred Stock
Class Of Stock [Line Items]
Preferred stock, shares issued	126,045,531
Gross proceeds from issuance of stock	$ 748,800,000
Issuance costs	$ 11,800,000
Temporary equity into common stock, conversion rate					1
Temporary equity, liquidation preference				$ 0	$ 0
Minimum net proceeds required under qualified initial public offering					$ 200,000,000
Temporary equity, conversion description					Each share of preferred stock was convertible, at the option of the holder, into shares of common stock by dividing the original issue price by the conversion price, subject to adjustments for certain events as defined by the Amended Certificate of Incorporation. Each redeemable convertible preferred share would automatically be converted into common stock upon the election by the majority of investors provided in writing to the Company at the rate of 1:1. The number of shares of common stock issuable upon conversion of each share of redeemable convertible preferred stock shall be appropriately adjusted to reflect any stock dividend, stock split or other similar event affecting the number of outstanding shares of common stock. Each share of preferred stock would automatically be converted into common stock, (i) immediately prior to the closing of a Qualified IPO, (ii) upon the election of the preferred majority provided in writing to the Company, which notice may be provided at any time, or (iii) immediately at such time as the liquidation preference had been reduced to zero. A Qualified IPO was defined as a sale of any class of shares of the Company, resulting in at least $200 million of net proceeds to the Company, in which the per share price of the shares of Common Stock being offered in such public offering was at least (i) prior to October 12, 2022, 1.25x the original issue price and (ii) on or following October 12, 2022, one times the original issue price. In addition, the Company shall not redeem any portion of the preferred stock, without majority written consent of the preferred stockholders.
Temporary equity, dividends accrued or payable					$ 0
Redeemable Convertible Preferred Stock | Prior To October 12, 2022
Class Of Stock [Line Items]
Offering price per share required under qualified initial public offering as percentage of original issue price					125.00%
Redeemable Convertible Preferred Stock | On or Following October 12, 2022
Class Of Stock [Line Items]
Offering price per share required under qualified initial public offering as percentage of original issue price					100.00%
Preferred and Common Stockholders
Class Of Stock [Line Items]
Payments of special dividend		$ 1,167,100,000	$ 154,400,000
Common Class A
Class Of Stock [Line Items]
Charitable stock donation, Shares				1,075,000