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STOCK OPTIONS (Details) - USD ($)
$ in Thousands
1 Months Ended 6 Months Ended 12 Months Ended
Jan. 31, 2017
Dec. 31, 2016
Dec. 31, 2016
Dec. 31, 2016
Dec. 31, 2015
Dec. 31, 2014
Apr. 30, 2015
Mar. 31, 2015
Stock options                
Maximum aggregate number of shares reserved for issuance during term of employee stock purchase plan   6,585,224 6,585,224 6,585,224        
Stock-based compensation       $ 5,063 $ 4,666 $ 2,730    
Stock Options                
Stock options                
Options to purchase common stock outstanding   3,193,785 3,193,785 3,193,785 3,253,310      
Granted (in shares)       333,250        
Expected term       10 years        
Vesting period       48 months        
2007 Plan                
Stock options                
Options to purchase common stock outstanding   150,207 150,207 150,207        
Shares available for future grants   0 0 0        
Expected term       10 years        
2010 Plan                
Stock options                
Options to purchase common stock outstanding   1,821,487 1,821,487 1,821,487        
Shares available for future grants   322,355 322,355 322,355        
Granted (in shares)     0          
Expected term       10 years        
2015 Plan                
Stock options                
Options to purchase common stock outstanding   1,222,085 1,222,085 1,222,085        
Shares authorized for issuance   4,322,355 4,322,355 4,322,355     4,000,000  
Expected term       10 years        
Employee Stock Purchase Plan                
Stock options                
Shares authorized for issuance               187,500
Percentage of outstanding shares reserved for future issuance       1.00%        
Increase in shares of common stock reserved for issuance       50,000        
Maximum aggregate number of shares reserved for issuance during term of employee stock purchase plan   1,250,000 1,250,000 1,250,000        
Offering Period       6 months        
Stock issued under ESPP (in shares) 7,986              
Stock-based compensation       $ 46 $ 41      
Common Stock                
Stock options                
Stock issued under ESPP (in shares)       16,729        
Accrued expenses. | Employee Stock Purchase Plan                
Stock options                
Employee payroll deductions   $ 51