Stockholders' Equity (Deficit) - Share-based Compensation Payment Plans - Additional Information (Details) - USD ($)	1 Months Ended			3 Months Ended		6 Months Ended
	Jul. 31, 2021	May 31, 2021	Jun. 30, 2020	Jun. 30, 2021	Jun. 30, 2020	Jun. 30, 2021	Jun. 30, 2020	May 27, 2021	Dec. 31, 2020
Class Of Stock [Line Items]
Common Stock, Shares, Issued				395,048,000		395,048,000			299,765,000
Share-based payment arrangement, expense				$ 2,500,000	$ 3,000,000.0	$ 5,500,000	$ 5,400,000
Total unrecognized share based compensation				$ 10,000,000.0		$ 10,000,000.0
Share-based compensation over a weighted average period						1 year 4 months 24 days
Subsequent Event [Member]
Class Of Stock [Line Items]
Options granted to purchase an aggregate shares of common stock	60,000
Aggregate estimated grant date fair value of the options vested	$ 15,100,000
Share-based Payment Arrangement, Option [Member] | Subsequent Event [Member]
Class Of Stock [Line Items]
Share-based compensation over a weighted average period	3 years 2 months 12 days
Share-based Payment Arrangement, Option [Member] | Maximum [Member]
Class Of Stock [Line Items]
Aggregate intrinsic value of options exercised						$ 100,000
Restricted Stock Units [Member]
Class Of Stock [Line Items]
Aggregate intrinsic value of vested and settled						$ 1,100,000
Restricted Stock Units [Member] | Subsequent Event [Member]
Class Of Stock [Line Items]
Options granted to purchase an aggregate shares of common stock	7,782,279
Performance Shares Unit [Member] | Subsequent Event [Member]
Class Of Stock [Line Items]
Options granted to purchase an aggregate shares of common stock	4,586,668
Aggregate estimated grant date fair value of the options vested	$ 2,800,000
RSUs and PSUs [Member] | Subsequent Event [Member]
Class Of Stock [Line Items]
Aggregate estimated grant date fair value of the options vested	$ 12,300,000
2019 Stock Incentive Plan [Member]
Class Of Stock [Line Items]
Number of shares common stock available								22,475,000
Plan 2019 [Member]
Class Of Stock [Line Items]
Share-based compensation arrangement by share-based payment award, number of shares authorized				25,086,153		25,086,153			2,583,565
Employee Stock Purchase Plan [Member]
Class Of Stock [Line Items]
Number of shares common stock available			5,400,000		5,400,000		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		$ 0.89
Proceeds from stock plans		$ 100,000