Common Stock (Stock Option Activity and Additional Details) (Details) - shares	3 Months Ended	12 Months Ended
	Dec. 31, 2019	Dec. 31, 2019	Dec. 31, 2018	Dec. 31, 2017
Class of Stock [Line Items]
Granted (in shares)		3,000,000
Number of stock options vested (in shares)		0	0	0
Time-Vested options
Class of Stock [Line Items]
Granted (in shares)	1,000,000.0
Vesting period in years		5 years
Performance-Based options
Class of Stock [Line Items]
Granted (in shares)	2,000,000.0
Vesting period in years		7 years