Accrued Liabilities - Schedule of Accrued Liabilities (Details) - USD ($) $ in Thousands	Sep. 30, 2019	Dec. 31, 2018
Payables and Accruals [Abstract]
Bonus payable	$ 1,744	$ 3,244
Payroll payable	51	773
Accrued interest – 11.25% Senior Notes	7,031	14,063
Accrued interest – other	478	104
Accrued well costs	3,074	9,026
Third party payments for joint interest expenditures	140	0
Accrued severance, property and franchise taxes	2,356	96
Accrued federal income tax	439	441
Current portion of operating lease liability	112	0
Other	675	381
Total accrued liabilities	$ 16,100	$ 28,128
Debt instrument interest rate (as a percent)	11.25%