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STOCK BASED COMPENSATION - Stock Options (Details) - Stock options
3 Months Ended
Jan. 05, 2017
$ / shares
shares
May 07, 2015
USD ($)
$ / shares
shares
May 06, 2015
item
$ / shares
shares
Mar. 31, 2018
USD ($)
$ / shares
shares
Mar. 31, 2017
USD ($)
2012 Equity Incentive Plan          
Stock-Based Compensation          
Weighted Average Exercise Price | $ / shares $ 4.69        
Expiration period 7 years       7 years
Fair value assumptions          
Expected volatility rate         49.48%
Expected term         3 years 6 months
Expected dividend rate         0.00%
Risk-free interest rate         2.26%
2012 Equity Incentive Plan | $4.69          
Exercise Price          
Number Exercisable at the end of the period (in shares)       525,000  
Weighted Average Exercise Price (in dollars per share) | $ / shares       $ 4.69  
Weighted-Average Remaining Contractual Life       5 years 9 months 18 days  
2012 Equity Incentive Plan | Mr. Georgiopoulos          
Stock-Based Compensation          
Granted (in shares) 500,000        
2012 Equity Incentive Plan | Leonard J. Vrondissis          
Stock-Based Compensation          
Granted (in shares) 25,000        
Navig8 Crude Tankers Inc          
Stock-Based Compensation          
Multiplier for converting number of shares issuable under Nagiv8 plan   0.8947      
Denominator for converting exercise price of outstanding awards issued under Navig8 plan   0.8947      
Number of stock options modified | item     1    
Number of shares per option prior to modification     15,000    
Exercise Price | $ / shares   $ 15.088 $ 13.50    
Number of shares per option after modification   13,420      
2015 Acquired VLCC Newbuildings | Navig8 Crude Tankers Inc          
Stock-Based Compensation          
Fair value of stock option | $   $ 39,000      
General and administrative expense | 2012 Equity Incentive Plan          
Stock-Based Compensation          
Stock-based compensation expense | $       $ 0 $ 1,300,000