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RESTRICTED STOCK UNITS, STOCK OPTIONS AND WARRANTS - Stock Option Activity (Details)
$ / shares in Units, shares in Thousands, $ in Millions
9 Months Ended 12 Months Ended
Sep. 30, 2019
USD ($)
$ / shares
shares
Dec. 31, 2018
$ / shares
shares
Shares    
Outstanding at beginning of period (shares) 11,904  
Granted (shares) 634  
Forfeited (shares) (419)  
Expired (shares) (408)  
Exercised (shares) (2,399)  
Outstanding at end of period (shares) 9,312 11,904
Vested at end of period (shares) 7,459  
Price    
Outstanding at beginning of period (USD per share) | $ / shares $ 4.00  
Granted (USD per share) | $ / shares 5.38  
Forfeited (USD per share) | $ / shares 7.73  
Expired (USD per share) | $ / shares 6.88  
Exercised (USD per share) | $ / shares 1.20  
Outstanding at end of period (USD per share) | $ / shares 4.52 $ 4.00
Vested (USD per share) | $ / shares $ 3.95  
Term    
Term of outstanding options 5 years 1 month 27 days 5 years 1 month 6 days
Term of vested options (years) 4 years 3 months 5 days  
Aggregate intrinsic value of stock options outstanding | $ $ 10.3  
Aggregate intrinsic value of vested stock options | $ $ 10.3  
Outstanding stock options not expected to vest due to forfeitures (shares) 200