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STOCK BASED COMPENSATION - Narrative (Details) - USD ($)
$ in Thousands
3 Months Ended 6 Months Ended
Jun. 30, 2017
Jun. 30, 2016
Jun. 30, 2017
Jun. 30, 2016
Dec. 31, 2016
May 31, 2015
Stock-based compensation            
Shares of common stock authorized for issuance outstanding (in shares) 3,124,039   3,124,039   2,326,801  
Employee Stock Purchase Plan, Purchase Price Percentage     85.00%      
Issuance for employee stock purchase plan, shares     66,785      
Proceeds from issuances of common stock from employee stock purchase plans     $ 673      
Employee Stock Purchase Plan, Compensation Expense $ 108 $ 101 214 $ 168    
Stock options            
Stock-based compensation            
Unrecognized compensation cost related to outstanding options $ 21,344   $ 21,344      
Period over which unrecognized compensation cost is expected to be recognized as expense     2 years 10 months 24 days      
2014 Stock Incentive Plan            
Stock-based compensation            
Shares of common stock authorized for issuance (in shares) 1,079,440   1,079,440     2,700,000
Increase in number of authorized shares on the first day of each fiscal year, as a percentage of outstanding common stock (as a percent)     4.00%      
Vesting period     4 years      
Contractual life     10 years      
2014 Stock Incentive Plan | Minimum            
Stock-based compensation            
Period following termination date vested options are exercisable     1 month      
2014 Stock Incentive Plan | Maximum            
Stock-based compensation            
Period following termination date vested options are exercisable     3 months