Acquisitions and Divestitures - Additional Information (Details) - USD ($) $ / shares in Units, $ in Thousands			3 Months Ended
	Aug. 02, 2017	Jun. 15, 2017	Mar. 31, 2018	Mar. 31, 2017
Business Acquisition [Line Items]
Acquisition of oil and gas properties			$ 1,605	$ 1,563
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
Effective date of acquisition		Apr. 01, 2017
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
Purchase consideration paid to acquire unevaluated acreage and other assets		1,400
Asset retirement obligations recorded with the acquisition of properties		1,900
Fair value of net assets acquired		48,100
Acquisition costs		$ 1,200
Effective date of acquisition		Jan. 01, 2017
Series B Convertible Participating Preferred Stock | Battlecat Oil & Gas, LLC
Business Acquisition [Line Items]
Number of shares issued in connection with acquisition		1,184,632
Preferred Stock, par value		$ 0.001
Value of shares issued in connection with acquisition		$ 4,800
Series B Convertible Participating Preferred Stock | SN Marquis LLC
Business Acquisition [Line Items]
Number of shares issued in connection with acquisition		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
Fort Worth, Texas | Other Expense [Member]
Business Acquisition [Line Items]
Impairment charge			$ 1,600