Acquisitions and Divestitures - Additional Information (Details)			3 Months Ended		6 Months Ended
	Jun. 15, 2017 USD ($) $ / shares shares	Apr. 03, 2017 USD ($) Well	Jun. 30, 2017 USD ($) $ / shares shares	Jun. 30, 2016 USD ($)	Jun. 30, 2017 USD ($) $ / shares shares	Jun. 30, 2016 USD ($)	Jun. 02, 2017 $ / shares	Dec. 31, 2016 $ / shares shares
Business Acquisition [Line Items]
Acquisition of oil and gas properties					$ 108,179,000	$ 2,717,000
Preferred stock, par value | $ / shares			$ 0.001		$ 0.001
Accretion of asset retirement obligations			$ 38,000	$ 51,000	$ 58,000	$ 107,000
Acquisition costs			$ 2,726,000		$ 2,726,000
Series B Convertible Participating Preferred Stock
Business Acquisition [Line Items]
Preferred stock, par value | $ / shares			$ 0.001		$ 0.001			$ 0.001
Preferred stock, shares issued | shares			2,684,632		2,684,632			0
Series A-1 Convertible Participating Preferred Stock
Business Acquisition [Line Items]
Preferred stock, par value | $ / shares			$ 0.001		$ 0.001		$ 0.001	$ 0.001
Preferred stock, shares issued | shares			5,400		5,400			0
Battlecat Oil & Gas, LLC
Business Acquisition [Line Items]
Acquisition of oil and gas properties	$ 55,000,000
Effective date of acquisition	Apr. 01, 2017
Purchase consideration of oil and gas properties	$ 59,800,000
Purchase consideration paid to acquire proved reserves	56,300,000
Purchase consideration paid to acquire unproved reserves	2,900,000
Purchase consideration paid to acquire unevaluated acreage and other assets	600,000
Accretion of asset retirement obligations	200,000
Fair value of net assets acquired	59,600,000
Acquisition costs	$ 1,500,000
Battlecat Oil & Gas, LLC | Series B Convertible Participating Preferred Stock
Business Acquisition [Line Items]
Number of shares issued in connection with acquisition | shares	1,184,632
Preferred stock, par value | $ / shares	$ 0.001
Value of shares issued in connection with acquisition	$ 4,800,000
SN Marquis LLC
Business Acquisition [Line Items]
Acquisition of oil and gas properties	$ 44,000,000
Effective date of acquisition	Jan. 01, 2017
Purchase consideration of oil and gas properties	$ 50,000,000
Purchase consideration paid to acquire proved reserves	48,000,000
Purchase consideration paid to acquire unproved reserves	600,000
Accretion of asset retirement obligations	1,900,000
Fair value of net assets acquired	48,100,000
Acquisition costs	1,200,000
Purchase consideration paid to acquire land, building and other assets	$ 1,400,000
SN Marquis LLC | Series B Convertible Participating Preferred Stock
Business Acquisition [Line Items]
Number of shares issued in connection with acquisition | shares	1,500,000
Value of shares issued in connection with acquisition	$ 6,000,000
SN Marquis LLC | Series B Convertible Participating Preferred Stock | SN UR Holdings, LLC
Business Acquisition [Line Items]
Number of shares issued in connection with acquisition | shares	1,500,000
Battlecat and Marquis
Business Acquisition [Line Items]
Series A-1 convertible participating preferred stock, $0.001 par value and Series B convertible participating preferred stock, $0.001 par value, 5,400 shares and 2,684,632 shares issued and outstanding at June 30, 2017, respectively, 0 and 0 issued and outstanding at December 31, 2016, respectively	$ 80,000,000
Preferred stock issued to finance acquisition, convertible conversion price | $ / shares	$ 6.00
Senior Secured Credit Facility issue to finance acquisition	$ 24,000,000
Battlecat and Marquis | Series A-1 Convertible Participating Preferred Stock
Business Acquisition [Line Items]
Preferred stock, shares issued | shares	5,400
Battlecat and Marquis | Series A-2 Convertible Participating Preferred Stock
Business Acquisition [Line Items]
Preferred stock, shares issued | shares	74,600
Eagleford Gas 8, LLC | Gonzales
Business Acquisition [Line Items]
Purchase and sale agreement date		Mar. 13, 2017
Undivided working interest acquired in producing wells		33.50%
Undivided revenue interest acquired in producing wells		26.80%
Productive oil wells, number of wells | Well		6
Acquisition of oil and gas properties		$ 7,600,000
Effective date of acquisition		Apr. 01, 2017