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CAPITAL STOCK (Details)
$ / shares in Units, $ in Thousands
 12 Months Ended
Nov. 16, 2016
shares
Dec. 31, 2017
$ / shares
shares
Dec. 31, 2016
USD ($)
$ / shares
shares
Dec. 31, 2015
USD ($)
shares
Nov. 10, 2016
$ / shares
Class of Stock [Line Items]          
Common stock, shares authorized   75,000,000 40,000,000    
Common stock, number of votes per share   1      
Common stock, par value (in dollars per share) | $ / shares   $ 0.001 $ 0.001    
Issuance of common stock | $     $ 5,830 $ 11,531  
Preferred stock, shares authorized   10,000,000      
Series B Preferred Stock          
Class of Stock [Line Items]          
Preferred stock, shares outstanding   0 975,639    
Preferred stock, shares authorized   3,588,139 3,588,139    
Preferred stock, par value (in dollars per share) | $ / shares   $ 0.001 $ 0.001    
Preferred stock, shares issued   0 975,639    
Conversion ratio   2      
Primary Offering          
Class of Stock [Line Items]          
Issuance of common stock (in shares) 1,625,000        
Secondary Offering          
Class of Stock [Line Items]          
Issuance of common stock (in shares) 1,625,000        
Common Stock          
Class of Stock [Line Items]          
Public offering price per share | $ / shares         $ 4.00
Issuance of common stock (in shares)     1,625,000 5,219,000  
Issuance of common stock | $     $ 2 $ 5