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SHAREHOLDERS EQUITY - Stock based compensation - Stock Options (Details) - USD ($)
$ in Millions
12 Months Ended
Dec. 31, 2018
Dec. 31, 2017
Stock Options    
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]    
Number of options forfeited, cancelled or terminated 126,767  
Stock-based compensation expense $ 0.5 $ 0.8
Unrecognized stock-based compensation expense $ 0.6  
Cost is expected to be recognized over a weighted-average period 1 year 3 months  
Plan 2016    
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]    
Number of shares available for issuance 697,138  
Maximum number of shares eligible to be granted after modifications to the plan 1,163,085  
2008 Plan    
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]    
Number of options forfeited, cancelled or terminated 465,947  
Amount of consideration paid to the company upon plan modification $ 0.0