Nature of Ops and Sign. Acctg Policies (Plan of Reorganization) (Details Textuals) - USD ($)	Sep. 18, 2020	Dec. 31, 2020	Jul. 28, 2020	Dec. 31, 2019
Plan of Chapter 11 Reorganization [Line Items]
Principal amount of debt cancelled	$ 2,100,000,000
Successor common stock, shares authorized	250,000,000	250,000,000		750,000,000
Successor common stock, par value	$ 0.001	$ 0.001		$ 0.001
Successor preferred stock, shares authorized	50,000,000	50,000,000		25,000,000
Successor preferred stock, par value	$ 0.001	$ 0.001		$ 0.001
Lender commitments	$ 575,000,000	$ 575,000,000
Series A Warrants
Plan of Chapter 11 Reorganization [Line Items]
Number of warrants outstanding	2,631,579
Exercise price of warrants	$ 32.59	$ 32.59
Series A Warrants | Maximum
Plan of Chapter 11 Reorganization [Line Items]
Equity percentage under plan of reorganization	5.00%
Series B Warrants
Plan of Chapter 11 Reorganization [Line Items]
Number of warrants outstanding	2,894,740
Exercise price of warrants	$ 35.41	$ 35.41
Lenders under Predecessor Credit Facility
Plan of Chapter 11 Reorganization [Line Items]
Consenting percentage			100.00%
Second Lien Note Holders
Plan of Chapter 11 Reorganization [Line Items]
Consenting percentage			67.10%
Common stock, shares outstanding	47,499,999
Equity percentage under plan of reorganization	95.00%
Convertible Note Holders
Plan of Chapter 11 Reorganization [Line Items]
Consenting percentage			73.10%
Common stock, shares outstanding	2,500,000
Equity percentage under plan of reorganization	5.00%
Convertible Note Holders | Series A Warrants
Plan of Chapter 11 Reorganization [Line Items]
Percentage of warrants	100.00%
Subordinated Note Holders | Series B Warrants
Plan of Chapter 11 Reorganization [Line Items]
Percentage of warrants	54.55%
Subordinated Note Holders | Series B Warrants | Maximum
Plan of Chapter 11 Reorganization [Line Items]
Equity percentage under plan of reorganization	3.00%
Equity Holders | Series B Warrants
Plan of Chapter 11 Reorganization [Line Items]
Percentage of warrants	45.45%
Equity Holders | Series B Warrants | Maximum
Plan of Chapter 11 Reorganization [Line Items]
Equity percentage under plan of reorganization	2.50%