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SHARE-BASED COMPENSATION - EQUITY INCENTIVE PLAN (Details)
12 Months Ended
Aug. 01, 2015
EquityInstruments
Jul. 01, 2015
EquityInstruments
Nov. 14, 2014
USD ($)
EquityInstruments
Nov. 13, 2014
USD ($)
EquityInstruments
Oct. 30, 2014
Dec. 31, 2017
USD ($)
Dec. 31, 2016
USD ($)
Dec. 31, 2015
USD ($)
SHARE-BASED COMPENSATION                
Fair values recognized           $ (223,000) $ 997,000 $ 1,389,000
Administrative expenses           (223,000) 997,000 $ 1,389,000
2014 Equity Incentive Plan                
SHARE-BASED COMPENSATION                
Options granted to directors | EquityInstruments       330,000        
Exercise price (in dollars per share)       $ 1.0        
Vesting period (in years)         10 years      
2014 Equity Incentive Plan | First year                
SHARE-BASED COMPENSATION                
Vesting percentage (as a percent)       33.33%        
2014 Equity Incentive Plan | Second year                
SHARE-BASED COMPENSATION                
Vesting percentage (as a percent)       33.33%        
2014 Equity Incentive Plan | Third year                
SHARE-BASED COMPENSATION                
Vesting percentage (as a percent)       33.33%        
2014 Equity Incentive Plan | July 1, 2015 and August 1, 2015 | First year                
SHARE-BASED COMPENSATION                
Vesting percentage (as a percent) 50.00% 50.00%            
2014 Equity Incentive Plan | July 1, 2015 and August 1, 2015 | Second year                
SHARE-BASED COMPENSATION                
Vesting percentage (as a percent) 50.00% 50.00%            
Restricted shares | November 14, 2014                
SHARE-BASED COMPENSATION                
Awards granted | EquityInstruments     1,800,000          
Percentage that vests on IPO Date (as a percent)     25.00%          
Percentage that vests after IPO Date (as a percent)     75.00%          
Unrecognized amounts of the unvested shares           0 174,000  
Fair value of the share     $ 1.14          
Restricted shares | November 14, 2014 | First year                
SHARE-BASED COMPENSATION                
Annual vesting post IPO Date (as a percent)     25.00%          
Restricted shares | November 14, 2014 | Second year                
SHARE-BASED COMPENSATION                
Vesting percentage (as a percent)     25.00%          
Restricted shares | November 14, 2014 | Third year                
SHARE-BASED COMPENSATION                
Vesting percentage (as a percent)     25.00%          
Restricted shares | July 1, 2015 and August 1, 2015                
SHARE-BASED COMPENSATION                
Awards granted | EquityInstruments 500,000 500,000            
Unrecognized amounts of the unvested shares           0 156,000  
Fair value of the share           $ 1.13 $ 1.18