Accrued Liabilities - Schedule of Accrued Liabilities (Details) - USD ($) $ in Thousands	Mar. 31, 2019	Dec. 31, 2018
Payables and Accruals [Abstract]
Bonus payable	$ 851	$ 3,244
Payroll payable	98	773
Accrued interest – 11.25% Senior Notes	7,031	14,063
Accrued interest – other	447	104
Accrued rent	0	105
Accrued well costs	6,338	9,026
Third party payments for joint interest expenditures	3,241	0
Accrued severance, property and franchise taxes	688	96
Accrued federal income tax	439	441
Current portion of operating lease liability	244
Other	495	276
Total accrued liabilities	$ 19,872	$ 28,128
Debt instrument interest rate (as a percent)	11.25%