Stockholders' Equity - Additional Information (Details) - USD ($) $ / shares in Units, $ in Thousands			1 Months Ended	3 Months Ended			9 Months Ended
	Sep. 28, 2018	Nov. 03, 2017	Jun. 30, 2017	Mar. 31, 2019	Mar. 31, 2018	Sep. 30, 2017	Sep. 30, 2018
Class of Stock [Line Items]
Minimum percentage of outstanding common stock beneficially own by approved holders			10.00%
Debt instrument interest rate (as a percent)				11.25%
Retirement of Class B Common Stock, shares	2,500,000
Retirement of Class B Common Stock, value	$ 10,000
Senior Unsecured Notes
Class of Stock [Line Items]
Unsecured notes, maturity period							2 years
Debt instrument interest rate (as a percent)							9.00%
Series A-1 Convertible Participating Preferred Stock
Class of Stock [Line Items]
Conversion of stock, threshold trading days			20 days
Conversion of stock, threshold consecutive trading days			30 days
Threshold percentage of conversion price prior to June 15, 2019			200.00%
Threshold percentage of conversion price after June 15, 2019 but before June 15, 2020			175.00%
Threshold percentage of conversion price after June 15, 2020			150.00%
Preferred stock, dividend rate, percentage							20.00%
Payment-in-kind dividends (in shares)				2,065	1,889	11,784
Series A-1 Convertible Participating Preferred Stock | Battlecat and Marquis
Class of Stock [Line Items]
Number of shares issued			5,400,000
Preferred stock, par value (in dollars per share)			$ 0.001
Series A-2 Convertible Participating Preferred Stock | Battlecat and Marquis
Class of Stock [Line Items]
Preferred stock, par value (in dollars per share)			$ 0.001
Convertible participating preferred stock, number of shares issued			74,600,000
Series B Convertible Participating Preferred Stock
Class of Stock [Line Items]
Preferred stock to common stock conversion basis		one-for-one
Series B Convertible Participating Preferred Stock | Battlecat Oil & Gas, LLC
Class of Stock [Line Items]
Number of shares issued in connection with acquisition			1,184,632,000,000
Series B Convertible Participating Preferred Stock | SN Marquis LLC
Class of Stock [Line Items]
Number of shares issued in connection with acquisition			1,500,000,000,000
Series A Preferred Stock
Class of Stock [Line Items]
Minimum percentage of outstanding preferred stock beneficially own by approved holders			15.00%
Preferred stock, dividend rate, percentage							9.00%
Shares issued, price per share							$ 975
Preferred stock, increase in dividend rate for next succeeding dividend period							5.00%
Preferred stock, additional increase in dividend rate for each successive dividend period							1.00%
Preferred stock redemption percentage							110.00%
Preferred stock redemption percentage							105.00%
Preferred stock redemption percentage							100.00%
Series A Preferred Stock | Maximum
Class of Stock [Line Items]
Preferred stock, dividend rate, percentage							20.00%
Class A Voting Common Stock
Class of Stock [Line Items]
Preferred stock, liquidation preference per share			$ 1,000