Convertible Preferred Stock - Additional Information (Details) - USD ($)		3 Months Ended	9 Months Ended	12 Months Ended
	Aug. 21, 2020	Sep. 30, 2020	Sep. 30, 2020	Dec. 31, 2019	Jun. 30, 2020	Aug. 09, 2019	Jan. 08, 2018	Sep. 22, 2017
Class Of Stock [Line Items]
Convertible preferred stock, shares outstanding				318,510,205	318,510,205
Convertible preferred stock aggregate amount				$ 411,275,000	$ 434,009,000
Preferred stock dividend declared				$ 0
Series A Convertible Preferred Stock
Class Of Stock [Line Items]
Convertible preferred stock, shares authorized		286,000,000	286,000,000
Convertible preferred stock, shares issued		285,000,000	285,000,000				15,000,000	270,000,000
Convertible preferred stock, shares outstanding		285,000,000	285,000,000
Convertible preferred stock, purchase price							$ 1.00	$ 1.00
Convertible preferred stock aggregate amount							$ 15,000,000	$ 270,000,000
Percentage preferred stock accrued dividends			10.00%
Series B Convertible Preferred Stock
Class Of Stock [Line Items]
Convertible preferred stock, shares authorized		8,030,000	8,030,000
Convertible preferred stock, shares issued		8,000,000	8,000,000				8,000,000
Convertible preferred stock, shares outstanding		8,000,000	8,000,000
Convertible preferred stock, purchase price							$ 1.25
Convertible preferred stock aggregate amount							$ 10,000,000
Percentage preferred stock accrued dividends			10.00%
Series C Convertible Preferred Stock
Class Of Stock [Line Items]
Convertible preferred stock, shares authorized		25,600,000	25,600,000
Convertible preferred stock, shares issued		25,510,205	25,510,205			25,510,205
Convertible preferred stock, shares outstanding		25,510,205	25,510,205
Convertible preferred stock, purchase price						$ 1.96
Convertible preferred stock aggregate amount						$ 50,000,000
Percentage preferred stock accrued dividends			10.00%
Common Stock
Class Of Stock [Line Items]
Common stock issued	42,926,630	42,926,630	42,926,630