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SHARE-BASED COMPENSATION (Details) - $ / shares
12 Months Ended
Dec. 31, 2018
Dec. 31, 2017
2007 EIP    
SHARE-BASED COMPENSATION    
Number of shares of common stock reserved for grants 691,051  
Common stock issued under share-based compensation plan 253,659  
2012 EIP    
SHARE-BASED COMPENSATION    
Number of shares of common stock reserved for grants 1,200,000  
Common stock issued under share-based compensation plan 635,089  
2015 EIP    
SHARE-BASED COMPENSATION    
Number of shares of common stock reserved for grants 1,100,000  
Common stock issued under share-based compensation plan 343,429  
Stock Options    
SHARE-BASED COMPENSATION    
Expiration term 10 years  
Summary of the stock option activity    
Outstanding at the beginning of the period (in shares) 67,188  
Granted (in shares) 0  
Expired (in shares) (10,326)  
Outstanding at the end of the period (in shares) 56,862 67,188
Exercisable (in shares) 56,862  
Weighted Average Exercise Price    
Outstanding at the beginning of the period (in dollars per share) $ 24.65  
Expired (in dollars per share) 77.47  
Outstanding at the end of the period (in dollars per share) 15.06 $ 24.65
Exercisable (in dollars per share) $ 15.06  
Weighted Average Remaining Contractual Term    
Outstanding at the end of the period 2 years 8 months 19 days 3 years 4 months 21 days
Exercisable 2 years 8 months 19 days  
Stock Options | 2007 EIP    
SHARE-BASED COMPENSATION    
Number of shares reserved 22,733  
Stock Options | 2012 EIP    
SHARE-BASED COMPENSATION    
Number of shares reserved 34,129  
Stock Options | Minimum    
SHARE-BASED COMPENSATION    
Vesting term 1 year  
Stock Options | Maximum    
SHARE-BASED COMPENSATION    
Vesting term 5 years  
RSU    
Summary of the stock option activity    
Outstanding at the beginning of the period (in shares) 512,142  
Outstanding at the end of the period (in shares)   512,142
Weighted Average Exercise Price    
Outstanding at the beginning of the period (in dollars per share) $ 4.57  
Outstanding at the end of the period (in dollars per share)   $ 4.57
RSU | 2007 EIP    
SHARE-BASED COMPENSATION    
Number of shares reserved 0  
RSU | 2015 EIP    
SHARE-BASED COMPENSATION    
Number of shares reserved 805,844  
RSU | Minimum    
SHARE-BASED COMPENSATION    
Vesting term 1 year  
RSU | Maximum    
SHARE-BASED COMPENSATION    
Vesting term 5 years