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Debt - Post-Emergence Indebtedness (Details) $ / shares in Units, shares in Millions |  | 1 Months Ended | 9 Months Ended |  |  |  |  |
--- | --- | --- | --- | --- | --- | --- | --- | ---
Oct. 04, 2016 USD ($) shares $ / shares | Oct. 31, 2016 USD ($) shares | Sep. 30, 2016 USD ($) shares | Sep. 30, 2015 USD ($) | Aug. 03, 2020 | Mar. 31, 2019 | Dec. 31, 2018 | Oct. 03, 2018 | Oct. 03, 2017
Debt Instrument |  |  |  |  |  |  |  |  |
Debt converted during period |  |  | $ 4,409,000 | $ (35,147,000) |  |  |  |  |
Common stock issued for debt (in shares) | shares |  |  | 84.4 |  |  |  |  |  |
Subsequent Event | Revolving Credit Facility | New Credit Facility |  |  |  |  |  |  |  |  |
Debt Instrument |  |  |  |  |  |  |  |  |
Maximum borrowing capacity | $ 425,000,000.0 |  |  |  |  |  |  |  |
Percentage of proved developed producing reserves pledged as collateral | 95.00% |  |  |  |  |  |  |  |
Percentage of proved reserves pledged as collateral | 95.00% |  |  |  |  |  |  |  |
Minimum PDP asset coverage ratio as of last day of each fiscal quarter | 1.75 |  |  |  |  |  |  |  |
Interest coverage ratio (less than) | 2.00 |  |  |  |  |  |  |  |
Subsequent Event | Revolving Credit Facility | New Credit Facility | Base Rate |  |  |  |  |  |  |  |  |
Debt Instrument |  |  |  |  |  |  |  |  |
Basis spread on variable rate | 3.75% |  |  |  |  |  |  |  |
Subsequent Event | Revolving Credit Facility | New Credit Facility | LIBOR |  |  |  |  |  |  |  |  |
Debt Instrument |  |  |  |  |  |  |  |  |
Basis spread on variable rate | 4.75% |  |  |  |  |  |  |  |
Basis spread on variable rate floor | 1.00% |  |  |  |  |  |  |  |
Subsequent Event | Convertible Debt |  |  |  |  |  |  |  |  |
Debt Instrument |  |  |  |  |  |  |  |  |
Number of shares issuable under convertible securities | shares | 15.0 |  |  |  |  |  |  |  |
Subsequent Event | Convertible Debt | New Convertible Debt |  |  |  |  |  |  |  |  |
Debt Instrument |  |  |  |  |  |  |  |  |
Face amount of debt instrument | $ 281,800,000 |  |  |  |  |  |  |  |
Make whole amount per $1.00 in principal | 0.783478 |  |  |  |  |  |  |  |
Conversion ratio for shares issuable per $1.00 in principal | 0.05330841 |  |  |  |  |  |  |  |
Mandatory conversion trigger, minimum proceeds from issuance of stock | $ 100,000,000 |  |  |  |  |  |  |  |
Mandatory conversion trigger, minimum per share price of stock issued (in usd per share) | $ / shares | $ 34.16 |  |  |  |  |  |  |  |
Number of days written notice for conversion | 30 days |  |  |  |  |  |  |  |
Conversion threshold consecutive trading days | 30 days |  |  |  |  |  |  |  |
Debt converted during period |  | $ 3,700,000 |  |  |  |  |  |  |
Common stock issued for debt (in shares) | shares |  | 0.2 |  |  |  |  |  |  |
Mandatory conversion threshold percentage of stock price trigger | 50.00% |  |  |  |  |  |  |  |
Redemption price as a percentage of principal | 100.00% |  |  |  |  |  |  |  |
Principal amount required to be secured following the occurrence of certain events | $ 100,000,000 |  |  |  |  |  |  |  |
Subsequent Event | Secured Notes | New Building Note |  |  |  |  |  |  |  |  |
Debt Instrument |  |  |  |  |  |  |  |  |
Face amount of debt instrument | $ 35,000,000.0 |  |  |  |  |  |  |  |
Term of facility | 46 months |  |  |  |  |  |  |  |
Number of days after refinancing that interest is payable | 90 days |  |  |  |  |  |  |  |
Proceeds from issuance of debt | $ 26,800,000 |  |  |  |  |  |  |  |
Forecast | Revolving Credit Facility | New Credit Facility |  |  |  |  |  |  |  |  |
Debt Instrument |  |  |  |  |  |  |  |  |
Total net leverage ratio (greater than) |  |  |  |  |  | 3.00 | 3.50 |  |
Forecast | Secured Notes | New Building Note |  |  |  |  |  |  |  |  |
Debt Instrument |  |  |  |  |  |  |  |  |
Annual interest rate |  |  |  |  | 10.00% |  |  | 8.00% | 6.00%

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