SHARE-BASED COMPENSATION - Narrative (Details) - USD ($)
$ / shares in Units, $ in Millions
3 Months Ended 9 Months Ended
Sep. 30, 2018
Sep. 30, 2017
Sep. 30, 2018
Sep. 30, 2017
Dec. 31, 2017
Omnibus Incentive Plan 2012          
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]          
Number of shares authorized for issuance 3,150,000   3,150,000    
Common stock, options outstanding 1,204,526   1,204,526   1,683
Options available for future grants 1,945,474   1,945,474    
Weighted-average grant date fair value of options granted $ 4.06   $ 4.06    
Weighted-average exercise price, options granted   $ 0 $ 6.12 $ 0  
Unrecognized compensation cost $ 3.5   $ 3.5    
Weighted-average period for recognizing cost     3 years 4 months 24 days    
Private Innovate 2015 Stock Incentive Plan          
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]          
Common stock, options outstanding 6,428,577   6,428,577   6,843,296
Options available for future grants 1,108,744   1,108,744    
Weighted-average grant date fair value of options granted   $ 1.46   1.59  
Weighted-average exercise price, options granted $ 0     $ 0  
Unrecognized compensation cost $ 2.8   $ 2.8    
Weighted-average period for recognizing cost     2 years 6 months