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SHARE-BASED COMPENSATION - EQUITY INCENTIVE PLAN (Details)
12 Months Ended
Aug. 01, 2015
USD ($)
EquityInstruments
Jul. 01, 2015
USD ($)
EquityInstruments
Nov. 14, 2014
USD ($)
EquityInstruments
Nov. 13, 2014
USD ($)
EquityInstruments
Oct. 30, 2014
Dec. 31, 2017
USD ($)
Dec. 31, 2016
USD ($)
SHARE-BASED COMPENSATION              
Fair values recognized           $ (223,000) $ 997,000
Administrative expenses           (223,000) 997,000
2014 Equity Incentive Plan              
SHARE-BASED COMPENSATION              
Expiry period (in years)         10 years    
Equity Incentive Plan 2014, Directors Tranche              
SHARE-BASED COMPENSATION              
Options granted | EquityInstruments       330,000      
Exercise price (in dollars per share)       $ 1.0      
Equity Incentive Plan 2014, Directors Tranche | Vesting on first anniversary of grant date              
SHARE-BASED COMPENSATION              
Vesting percentage (as a percent)       33.33%      
Equity Incentive Plan 2014, Directors Tranche | Vesting on second anniversary of grant date              
SHARE-BASED COMPENSATION              
Vesting percentage (as a percent)       33.33%      
Equity Incentive Plan 2014, Directors Tranche | Vesting on third anniversary of grant date              
SHARE-BASED COMPENSATION              
Vesting percentage (as a percent)       33.33%      
Equity Incentive Plan 2014, Employee First Tranche              
SHARE-BASED COMPENSATION              
Restricted shares granted | EquityInstruments     1,800,000        
Unrecognized amounts of the unvested shares           0 174,000
Share price     $ 1.14        
Equity Incentive Plan 2014, Employee First Tranche | Vesting immediately on IPO date              
SHARE-BASED COMPENSATION              
Vesting percentage (as a percent)     25.00%        
Equity Incentive Plan 2014, Employee First Tranche | Vesting after IPO date              
SHARE-BASED COMPENSATION              
Vesting percentage (as a percent)     75.00%        
Equity Incentive Plan 2014, Employee First Tranche | Vesting on first anniversary of IPO date              
SHARE-BASED COMPENSATION              
Vesting percentage (as a percent)     25.00%        
Equity Incentive Plan 2014, Employee First Tranche | Vesting on second anniversary of IPO date              
SHARE-BASED COMPENSATION              
Vesting percentage (as a percent)     25.00%        
Equity Incentive Plan 2014, Employee First Tranche | Vesting on third anniversary of IPO date              
SHARE-BASED COMPENSATION              
Vesting percentage (as a percent)     25.00%        
Equity Incentive Plan 2014, Employee Second And Third Tranche              
SHARE-BASED COMPENSATION              
Unrecognized amounts of the unvested shares           $ 0 $ 156,000
Equity Incentive Plan 2014, Employee Second Tranche              
SHARE-BASED COMPENSATION              
Restricted shares granted | EquityInstruments   500,000          
Share price   $ 1.18          
Equity Incentive Plan 2014, Employee Second Tranche | Vesting on first anniversary of grant date              
SHARE-BASED COMPENSATION              
Vesting percentage (as a percent)   50.00%          
Equity Incentive Plan 2014, Employee Second Tranche | Vesting on second anniversary of grant date              
SHARE-BASED COMPENSATION              
Vesting percentage (as a percent)   50.00%          
Equity Incentive Plan 2014, Employee Third Tranche              
SHARE-BASED COMPENSATION              
Restricted shares granted | EquityInstruments 500,000            
Share price $ 1.13            
Equity Incentive Plan 2014, Employee Third Tranche | Vesting on first anniversary of grant date              
SHARE-BASED COMPENSATION              
Vesting percentage (as a percent) 50.00%            
Equity Incentive Plan 2014, Employee Third Tranche | Vesting on second anniversary of grant date              
SHARE-BASED COMPENSATION              
Vesting percentage (as a percent) 50.00%