Convertible Preferred Stock - Additional Information (Details) - USD ($)		6 Months Ended	12 Months Ended
	Aug. 21, 2020	Jun. 30, 2020	Dec. 31, 2019	Mar. 31, 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	318,510,205
Convertible preferred stock aggregate amount		$ 434,009,000	$ 411,275,000	$ 422,642,000
Preferred stock dividend declared			$ 0
Series A Convertible Preferred Stock
Class Of Stock [Line Items]
Convertible preferred stock, shares authorized		286,000,000
Convertible preferred stock, shares issued		285,000,000				15,000,000	270,000,000
Convertible preferred stock, shares outstanding		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
Convertible preferred stock, shares issued		8,000,000				8,000,000
Convertible preferred stock, shares outstanding		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
Convertible preferred stock, shares issued		25,510,205			25,510,205
Convertible preferred stock, shares outstanding		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]
Stock issued for conversion of convertible securities	42,926,630