Fresh Start Accounting - Narrative (Details) - USD ($)			1 Months Ended	6 Months Ended
	Feb. 08, 2019	Dec. 28, 2017	Feb. 08, 2019	Jun. 30, 2019	Dec. 31, 2018
Fresh-Start Adjustment [Line Items]
Enterprise value	$ 155,246,000		$ 155,246,000
Postconfirmation, Proven Reserves, Fair Value	52,100,000		52,100,000
Oil and gas properties, full cost method	52,070,000		52,070,000
Unproven reserves, fair value	99,000,000		99,000,000
Undeveloped acreage, fair value	19,700,000		19,700,000
Asset retirement obligation	$ 2,500,000		2,500,000
Discount credit adjusted risk free rate	10.00%
Payment of professional fees at emergence			(5,398,000)
Common stock, shares outstanding (in shares)				9,371,000	25,587,000
Common stock, par value (in dollars per share)				$ 0.01	$ 0.001
Minimum
Fresh-Start Adjustment [Line Items]
Enterprise value	$ 104,000,000		104,000,000
Estimated enterprise value plus cash	117,000,000		117,000,000
Maximum
Fresh-Start Adjustment [Line Items]
Enterprise value	187,000,000		187,000,000
Estimated enterprise value plus cash	$ 200,000,000		$ 200,000,000
10% Senior Secured Notes due 2021
Fresh-Start Adjustment [Line Items]
Shares issued (in shares)		2,200,000
Extinguishment of debt, amount		$ 4,800,000
Exit Facility
Fresh-Start Adjustment [Line Items]
Discounted cash flow, credit spread percent	10.10%			10.10%
10% Secured PIK Notes due 2024
Fresh-Start Adjustment [Line Items]
Discounted cash flow, credit spread percent	11.90%			11.90%
Common Class A | Cancellation And Discharge Of Old Notes | Common Stock | Former Holders Of Old Notes
Fresh-Start Adjustment [Line Items]
Shares issued (in shares)	8,900,000
Common Class A | Commitment To Backstop Exit Facility | Common Stock | Consenting Creditors
Fresh-Start Adjustment [Line Items]
Shares issued (in shares)	300,000
Common Class A | Commitment To Backstop Exit Facility | Common Stock | Holders Of Stock Awards Which Vested At Emergence
Fresh-Start Adjustment [Line Items]
Shares issued (in shares)	263,599
Common Class B | Common Stock | Class B Holder
Fresh-Start Adjustment [Line Items]
Shares issued (in shares)	1
Common stock, par value (in dollars per share)	$ 0.01		$ 0.01
Common Class C | Common Stock | Class C Holder
Fresh-Start Adjustment [Line Items]
Shares issued (in shares)	1
2019 Long Term Incentive Plan | Restricted Stock Units (RSUs) | Fully Vested Upon Grant | Common Stock | Weighted Average
Fresh-Start Adjustment [Line Items]
Shares retired (in shares)	92,479
Common stock, shares outstanding (in shares)	171,120		171,120
Payment in Kind (PIK) Note | 10% Senior Secured Notes due 2021
Fresh-Start Adjustment [Line Items]
Stated interest rate	10.00%		10.00%
Payment in Kind (PIK) Note | 10% Senior Secured PIK Notes due 2021
Fresh-Start Adjustment [Line Items]
Stated interest rate	10.00%		10.00%
Payment in Kind (PIK) Note | 10% Secured PIK Notes due 2024
Fresh-Start Adjustment [Line Items]
Stated interest rate	10.00%		10.00%
Payment in Kind (PIK) Note | Cancellation And Discharge Of Old Notes | Former Holders Of Old Notes | 10% Secured PIK Notes due 2024
Fresh-Start Adjustment [Line Items]
Stated interest rate	10.00%		10.00%
Term Loan | Line of Credit | Multidraw Term Loan Agreement
Fresh-Start Adjustment [Line Items]
Extinguishment of debt, amount	$ 50,000,000
Term Loan | Line of Credit | Exit Facility
Fresh-Start Adjustment [Line Items]
Maximum borrowing capacity	$ 50,000,000		$ 50,000,000
Measurement Input, Discount Rate | Valuation, Income Approach
Fresh-Start Adjustment [Line Items]
Fair value of proved and probable reserves, weighted average cost of capital, percentage	13.00%
Reorganization Adjustments
Fresh-Start Adjustment [Line Items]
Success fees recognized at emergence	$ (3,592,000)		(3,592,000)
Payment of professional fees at emergence	(1,017,000)
Payment of accrued interest on the Multidraw Term Loan Agreement	(1,181,000)
10% Senior Secured PIK Notes due 2024	$ 80,000,000		$ 80,000,000