SHARE-BASED COMPENSATION - Assumptions (Details)
3 Months Ended 9 Months Ended
Sep. 30, 2019
Sep. 30, 2018
Sep. 30, 2019
Sep. 30, 2018
Private Innovate 2015 Stock Incentive Plan        
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]        
Expected dividend yield 0.00% 0.00% 0.00% 0.00%
Expected stock price volatility 0.00%   67.00%  
Risk-free interest rate 0.00%   3.00%  
Risk-free interest rate, minimum   2.80%   2.70%
Risk-free interest rate, maximum   3.00%   3.00%
Expected term 0 days      
Private Innovate 2015 Stock Incentive Plan | Minimum        
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]        
Expected stock price volatility   66.00%   66.00%
Expected term   8 years 6 months 8 years 2 months 12 days 8 years 6 months
Private Innovate 2015 Stock Incentive Plan | Maximum        
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]        
Expected stock price volatility   68.00%   72.00%
Expected term   9 years 1 month 6 days 8 years 8 months 12 days 9 years 6 months
Omnibus Incentive Plan 2012        
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]        
Expected dividend yield 0.00% 0.00% 0.00% 0.00%
Risk-free interest rate, minimum 1.50% 2.80% 1.50% 2.80%
Risk-free interest rate, maximum 1.90% 3.10% 2.70% 3.10%
Omnibus Incentive Plan 2012 | Minimum        
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]        
Expected stock price volatility 67.00% 65.00% 67.00% 65.00%
Expected term 5 years 5 years 5 years 5 years
Omnibus Incentive Plan 2012 | Maximum        
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]        
Expected stock price volatility 69.00% 73.00% 72.00% 73.00%
Expected term 10 years 10 years 10 years 10 years