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
Jan. 01, 2020
Jan. 01, 2019
Jan. 01, 2018
Jun. 21, 2017
Mar. 31, 2020
Mar. 31, 2019
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]            
Stock-based compensation         $ 0.3 $ 0.2
Expected dividend yield         0.00% 0.00%
Compensation cost not yet recognized         $ 1.5  
Compensation cost not yet recognized (in years)         1 year 10 months 24 days  
2014 Plan            
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]            
Increase in shares authorized (in shares) 1,382,546 1,378,432 1,385,366 1,000,000    
Percentage of outstanding stock           5.00%
Number of shares available for issuance (in shares)         4,133,416  
Restricted stock units            
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]            
Unvested, aggregate intrinsic value         $ 0.5