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RELATED-PARTY TRANSACTIONS - Transactions with Patriot Affiliates (Details) - USD ($)
$ / shares in Units, $ in Thousands
3 Months Ended
Nov. 07, 2014
Oct. 30, 2014
Mar. 31, 2019
Feb. 24, 2017
Greater Than 5% Shareholder, Patriot | Equity Support Payment        
Related Party Transaction [Line Items]        
Expenses from transactions with related parties $ 538      
Greater Than 5% Shareholder, Patriot | Reimbursement of Out-of-Pocket Expenses        
Related Party Transaction [Line Items]        
Expenses from transactions with related parties $ 100      
Greater Than 5% Shareholder, Patriot | Voting Common Stock        
Related Party Transaction [Line Items]        
Common stock, shares outstanding (in shares) 3,100,564     1,461,945
Ownership percentage 9.30%      
Greater Than 5% Shareholder, Patriot | Voting Common Stock | Voting Common Stock Option One        
Related Party Transaction [Line Items]        
Common stock issuable (in shares)   1,076,000    
Price per share issuable (in dollars per share)   $ 9.78    
Greater Than 5% Shareholder, Patriot | Voting Common Stock | Voting Common Stock Option Two        
Related Party Transaction [Line Items]        
Common stock issuable (in shares)   824,000    
Price per share issuable (in dollars per share)   $ 11.55    
Director | W. Kirk Wycoff        
Related Party Transaction [Line Items]        
Service term     1 year