Acquisitions and Divestitures - Additional Information (Details) - USD ($) $ / shares in Units, $ in Thousands				1 Months Ended	3 Months Ended	12 Months Ended
	Nov. 15, 2018	Aug. 02, 2017	Jun. 15, 2017	Jun. 30, 2017	Mar. 31, 2018	Dec. 31, 2018	Dec. 31, 2017
Business Acquisition [Line Items]
Acquisition of oil and gas properties						$ 45,539	$ 113,726
Series B Convertible Participating Preferred Stock
Business Acquisition [Line Items]
Preferred stock, par value (in dollars per share)						$ 0.001	$ 0.001
Sooner Acquisition
Business Acquisition [Line Items]
Purchase consideration of oil and gas properties	$ 38,700
Transaction costs capitalized	$ 300
Battlecat Oil & Gas, LLC
Business Acquisition [Line Items]
Purchase consideration of oil and gas properties			$ 59,800
Acquisition of oil and gas properties			55,000
Purchase consideration paid to acquire proved reserves			56,300
Purchase consideration paid to acquire unproved reserves			2,900
Purchase consideration paid to acquire unevaluated acreage and other assets			600
Asset retirement obligations recorded with the acquisition of properties			200
Fair value of net assets acquired			59,600
Acquisition costs			$ 1,500
Battlecat Oil & Gas, LLC | Series B Convertible Participating Preferred Stock
Business Acquisition [Line Items]
Number of shares issued in connection with acquisition			1,184,632	1,184,632
Preferred stock, par value (in dollars per share)			$ 0.001
Value of shares issued in connection with acquisition			$ 4,800
SN Marquis LLC
Business Acquisition [Line Items]
Purchase consideration of oil and gas properties			50,000
Acquisition of oil and gas properties			44,000
Purchase consideration paid to acquire proved reserves			48,000
Purchase consideration paid to acquire unproved reserves			600
Asset retirement obligations recorded with the acquisition of properties			1,900
Fair value of net assets acquired			48,100
Acquisition costs			1,200
Purchase consideration paid to acquire land, building and other assets			$ 1,400
SN Marquis LLC | Series B Convertible Participating Preferred Stock
Business Acquisition [Line Items]
Number of shares issued in connection with acquisition			1,500,000	1,500,000
Value of shares issued in connection with acquisition			$ 6,000
Fort Worth, Texas
Business Acquisition [Line Items]
Acquisition price of an office building		$ 10,000
Other expense | Fort Worth, Texas
Business Acquisition [Line Items]
Impairment related to leased acreage					$ 1,600