Quarterly report pursuant to Section 13 or 15(d)

COMMON AND PREFERRED STOCK - Narrative (Details)

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COMMON AND PREFERRED STOCK - Narrative (Details)
1 Months Ended 3 Months Ended 6 Months Ended 12 Months Ended
Jun. 04, 2018
shares
May 15, 2018
USD ($)
shares
Apr. 16, 2018
USD ($)
shares
Apr. 10, 2018
USD ($)
shares
Jan. 31, 2018
USD ($)
Jun. 30, 2018
class
$ / shares
shares
Jan. 31, 2018
USD ($)
shares
Jun. 30, 2018
class
$ / shares
shares
Jun. 30, 2017
shares
Jun. 30, 2018
USD ($)
class
$ / shares
shares
Jun. 30, 2017
shares
Dec. 31, 2017
$ / shares
shares
May 31, 2011
USD ($)
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]                          
Total shares of preferred and common stock authorized for issuance (shares)           455,000,000   455,000,000   455,000,000      
Number of classes of shares (classes) | class           2   2   2      
Common stock, shares authorized (shares)           450,000,000   450,000,000   450,000,000   450,000,000  
Common stock, par value (dollars per share) | $ / shares           $ 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  
Preferred stock, par value (dollars per share) | $ / shares           $ 0.001   $ 0.001   $ 0.001   $ 0.001  
Stock Activity [Abstract]                          
Fair value of common stock surrendered by certain employees to cover tax obligations | $                   $ 892      
Shares forfeited (shares)                   153,421   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                  
Sale of stock, subscription arrangement amount, maximum | $   $ 52,000,000     $ 40,000,000                
Stock Repurchase Program [Abstract]                          
Stock repurchase program, amount approved | $                         $ 150,000,000
Stock repurchased during period (in 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                        
Various investors                          
Exchange Transaction [Abstract]                          
Sale of stock, number of shares issued in transaction (shares)   34,666,668                      
Exchange Agreement                          
Exchange Transaction [Abstract]                          
Sale of stock, subscription arrangement amount, maximum | $         $ 52,000,000                
Exchange Agreement | Other Supporting Noteholders                          
Exchange Transaction [Abstract]                          
Sale of stock, number of shares issued in transaction (shares)   103,249,915       18,500,000   18,524,907          
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 | $                   $ 300,000      
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