Annual report pursuant to Section 13 and 15(d)

SUBSEQUENT EVENTS (Details)

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SUBSEQUENT EVENTS (Details) - Director - 2015 Plan - Restricted Stock
12 Months Ended
Jan. 22, 2019
director
shares
Dec. 31, 2018
director
shares
Subsequent events    
Granted (in shares) | shares   238,602
Number of directors | director   4
Vesting period   4 years
Subsequent Event    
Subsequent events    
Granted (in shares) | shares 32,653  
Number of directors | director 4  
Number of annual installments over which shares vest P4Y  
Subsequent Event | 2020    
Subsequent events    
Vesting rights percentage 25.00%  
Subsequent Event | 2021    
Subsequent events    
Vesting rights percentage 25.00%  
Subsequent Event | 2022    
Subsequent events    
Vesting rights percentage 25.00%  
Subsequent Event | 2023    
Subsequent events    
Vesting rights percentage 25.00%