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Long-Term Debt - Additional Information (Details) |  |  | 3 Months Ended | 6 Months Ended | 7 Months Ended |  |  |
--- | --- | --- | --- | --- | --- | --- | --- | ---
Feb. 10, 2017 USD ($) | Oct. 04, 2016 USD ($) | Jun. 30, 2018 USD ($) | Jun. 30, 2017 USD ($) | Jun. 30, 2018 USD ($) | Jun. 30, 2017 USD ($) | May 11, 2017 USD ($) | Oct. 03, 2019 | Oct. 03, 2018 | Oct. 03, 2017
Debt Instrument |  |  |  |  |  |  |  |  |  |
Gain on extinguishment of debt |  |  | $ 0 | $ 0 | $ 1,151,000 | $ 0 |  |  |  |
Amended New Credit Facility | LIBOR | Minimum |  |  |  |  |  |  |  |  |  |
Debt Instrument |  |  |  |  |  |  |  |  |  |
Basis spread on variable rate | 3.00% |  |  |  |  |  |  |  |  |
Amended New Credit Facility | LIBOR | Maximum |  |  |  |  |  |  |  |  |  |
Debt Instrument |  |  |  |  |  |  |  |  |  |
Basis spread on variable rate | 4.00% |  |  |  |  |  |  |  |  |
Amended New Credit Facility | Base Rate | Minimum |  |  |  |  |  |  |  |  |  |
Debt Instrument |  |  |  |  |  |  |  |  |  |
Basis spread on variable rate | 2.00% |  |  |  |  |  |  |  |  |
Amended New Credit Facility | Base Rate | Maximum |  |  |  |  |  |  |  |  |  |
Debt Instrument |  |  |  |  |  |  |  |  |  |
Basis spread on variable rate | 3.00% |  |  |  |  |  |  |  |  |
Revolving Credit Facility | New First Lien Exit Facility |  |  |  |  |  |  |  |  |  |
Debt Instrument |  |  |  |  |  |  |  |  |  |
Maximum borrowing capacity |  | $ 425,000,000.0 |  |  |  |  |  |  |  |
Cash collateral released | $ 50,000,000.0 |  |  |  |  |  |  |  |  |
Revolving Credit Facility | Amended New Credit Facility |  |  |  |  |  |  |  |  |  |
Debt Instrument |  |  |  |  |  |  |  |  |  |
Maximum borrowing capacity | 600,000,000.0 |  |  |  |  |  |  |  |  |
Borrowing base | $ 425,000,000.0 |  |  |  |  |  |  |  |  |
Commitment fee | 0.50% |  |  |  |  |  |  |  |  |
Percentage of proved reserves pledged as collateral | 95.00% |  |  |  |  |  |  |  |  |
Total net leverage ratio (no greater than) |  |  | 3.50 |  | 3.50 |  |  |  |  |
Interest coverage ratio (no less than) |  |  | 2.25 |  | 2.25 |  |  |  |  |
Aggregate principal amount of default trigger | $ 25,000,000.0 |  |  |  |  |  |  |  |  |
Default trigger related to judgment liability | 25,000,000.0 |  |  |  |  |  |  |  |  |
Debt outstanding |  |  | $ 0 |  | $ 0 |  |  |  |  |
Outstanding letters of credit |  |  | $ 6,200,000 |  | 6,200,000 |  |  |  |  |
Secured Notes | New Building Note |  |  |  |  |  |  |  |  |  |
Debt Instrument |  |  |  |  |  |  |  |  |  |
Face amount of debt instrument | $ 35,000,000.0 | 35,000,000.0 |  |  |  |  |  |  |  |
Fair Value |  | 36,600,000 |  |  |  |  |  |  |  |
Gain on extinguishment of debt |  |  |  |  | $ 1,200,000 |  |  |  |  |
Annual interest rate |  |  |  |  |  |  |  |  |  | 6.00%
Interest costs paid-in-kind |  |  |  |  |  |  | $ 1,300,000 |  |  |
Term of interest payments paid in kind (after refinancing or repayment) |  |  |  |  |  |  | 90 days |  |  |
Proceeds remitted to unsecured creditors |  | $ 26,800,000 |  |  |  |  |  |  |  |
Forecast | Secured Notes | New Building Note |  |  |  |  |  |  |  |  |  |
Debt Instrument |  |  |  |  |  |  |  |  |  |
Annual interest rate |  |  |  |  |  |  |  | 10.00% | 8.00% |

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