Quarterly report pursuant to Section 13 or 15(d)

STOCK BASED COMPENSATION - Narrative (Details)

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STOCK BASED COMPENSATION - Narrative (Details) - USD ($)
$ in Millions
3 Months Ended 9 Months Ended 12 Months Ended
Jan. 01, 2019
Jan. 01, 2018
Jun. 21, 2017
Sep. 30, 2019
Sep. 30, 2018
Sep. 30, 2019
Sep. 30, 2018
Dec. 31, 2018
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]                
Stock-based compensation       $ 0.2 $ 0.5 $ 0.7 $ 1.2  
Expected dividend yield       0.00% 0.00% 0.00% 0.00%  
Compensation cost not yet recognized       $ 1.9   $ 1.9    
Compensation cost not yet recognized (in years)           2 years 1 month 6 days    
2014 Plan                
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]                
Increase in shares authorized (in shares) 1,378,432 1,385,366 1,000,000          
Percentage of outstanding stock               5.00%
Number of shares available for issuance (in shares)       2,820,870   2,820,870    
Restricted stock units                
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]                
Unvested, aggregate intrinsic value       $ 1.0   $ 1.0