COMMON AND PREFERRED STOCK - Narrative (Details) - USD ($)						1 Months Ended			3 Months Ended		5 Months Ended	9 Months Ended		12 Months Ended
	Sep. 17, 2018	Jun. 04, 2018	May 15, 2018	Apr. 16, 2018	Apr. 10, 2018	Aug. 31, 2018	Jun. 30, 2018	Jan. 31, 2018	Sep. 30, 2018	Sep. 30, 2017	Sep. 30, 2018	Sep. 30, 2018	Sep. 30, 2017	Dec. 31, 2017	Aug. 01, 2018	Jul. 31, 2018	May 31, 2011
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Total shares of preferred and common stock authorized for issuance (shares)									680,000,000		680,000,000	680,000,000
Common stock, shares authorized (shares)									675,000,000		675,000,000	675,000,000		142,500,000	675,000,000	450,000,000
Common stock, par value (dollars per share)									$ 0.001		$ 0.001	$ 0.001		$ 0.001	$ 0.001
Preferred stock, shares authorized (shares)									5,000,000		5,000,000	5,000,000		5,000,000	5,000,000
Preferred stock, par value (dollars per share)									$ 0.001		$ 0.001	$ 0.001		$ 0.001	$ 0.001
Stock Activity [Abstract]
Fair value of common stock surrendered by certain employees to cover tax obligations												$ 910
Shares forfeited (shares)						187,500						172,759		270,510
Exchange Transaction [Abstract]
Sale of stock, number of shares issued in transaction (shares)				3,600,000	58,666,667
Proceeds from issuance of common stock				$ 5,200,000	$ 84,500,000
Stock Repurchase Program [Abstract]
Stock repurchase program, amount approved																	$ 150,000,000
Stock repurchased (shares)									0	0		0	0
Salt Creek Oil and Gas, LLC
Acquisition Agreement [Abstract]
Business acquisition, equity interest issued or issuable, number of shares (in shares)		6,000,000
Number of shares issued (shares)		6,000,000
Pivotal Entities
Acquisition Agreement [Abstract]
Number of shares issued (shares)	25,753,578
Various investors
Exchange Transaction [Abstract]
Sale of stock, number of shares issued in transaction (shares)			34,666,668
Exchange Agreement | Other Supporting Noteholders
Exchange Transaction [Abstract]
Sale of stock, number of shares issued in transaction (shares)			103,249,915				18,500,000		14,300,000		32,800,000
Exchange Agreement | Various investors
Exchange Transaction [Abstract]
Sale of stock, number of shares issued in transaction (shares)			34,700,000
Proceeds from issuance of common stock			$ 52,000,000
Certain employees
Stock Activity [Abstract]
Common stock surrendered by certain employees to cover tax obligations (shares)												200,000
Fair value of common stock surrendered by certain employees to cover tax obligations												$ 400,000
Chief Executive Officer
Stock Activity [Abstract]
Shares forfeited (shares)								900,000
Total amount of share-based compensation expense that was reversed in connection with the termination								$ 1,200,000