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SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES - Income Taxes (Details) - USD ($)
1 Months Ended 9 Months Ended 12 Months Ended
Feb. 07, 2017
Sep. 30, 2017
Sep. 30, 2017
Sep. 30, 2016
Dec. 31, 2016
Income Taxes          
Provision for federal income taxes     $ 0    
Texas franchise tax (as a percent)     0.75%    
Uncertain tax positions   $ 0 $ 0    
Interest and penalties   $ 0      
Predecessor          
Income Taxes          
Provision for federal income taxes         $ 0
Uncertain tax positions         $ 0
Interest and penalties $ 0     $ 0