Accrued Liabilities - Schedule of Accrued Liabilities (Details) - USD ($) $ in Thousands	Dec. 31, 2018	Dec. 31, 2017
Debt Instrument [Line Items]
Bonus payable	$ 3,244	$ 2,250
Payroll payable	773	18
Accrued interest - other	104	1,015
Accrued rent	105	156
Accrued well costs	9,026	8,386
Accrued severance, property and franchise taxes	96	115
Accrued federal income tax	441	1,147
Other	276	728
Total accrued liabilities	28,128	16,583
8.750% Senior Notes Due April 15, 2019
Debt Instrument [Line Items]
Accrued interest	0	2,768
11.25% Senior Notes
Debt Instrument [Line Items]
Accrued interest	$ 14,063	$ 0