Acquisitions and Divestitures - Pro Forma Revenue Statement (Details) - USD ($) $ / shares in Units, $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2017	Sep. 30, 2016	Sep. 30, 2017	Sep. 30, 2016
Business Acquisition [Line Items]
Revenues	$ 26,883	$ 23,946	$ 76,419	$ 69,690
Net income (loss) attributable to common stockholders	$ (8,585)	$ (12,088)	$ (19,764)	$ (32,317)
Net income (loss) per common share, basic and diluted	$ (0.39)	$ (1.54)	$ (0.91)	$ (4.24)
Pro Forma Adjustments
Business Acquisition [Line Items]
Net income (loss) attributable to common stockholders		$ (5,470)	$ 922	$ (10,561)
SN Marquis LLC
Business Acquisition [Line Items]
Revenues		7,318	11,983	22,234
Net income (loss) attributable to common stockholders		4,127	7,688	12,029
Battlecat Oil & Gas, LLC
Business Acquisition [Line Items]
Revenues		1,090	1,802	2,919
Net income (loss) attributable to common stockholders		516	603	1,617
LRAI
Business Acquisition [Line Items]
Revenues	$ 26,883	15,538	62,634	44,537
Net income (loss) attributable to common stockholders	$ (8,585)	$ (11,260)	$ (28,977)	$ (35,401)
Net income (loss) per common share, basic and diluted	$ (0.39)	$ (1.44)	$ (1.33)	$ (4.64)