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SHARE-BASED COMPENSATION - Stock Options (Details) - Stock Options - USD ($)
$ / shares in Units, $ in Thousands
3 Months Ended 6 Months Ended 12 Months Ended
Jun. 30, 2019
Jun. 30, 2018
Jun. 30, 2019
Jun. 30, 2018
Dec. 31, 2018
Number of Options          
Outstanding at beginning of period (in shares)     5,186,025    
Granted (in shares)     453,808    
Exercised (in shares)     (27,313)    
Expired/cancelled (in shares)     (954,413)    
Outstanding at end of period (in shares) 4,658,107   4,658,107   5,186,025
Exercisable at end of period (in shares) 2,167,286   2,167,286    
Weighted Average Exercise Price          
Outstanding at beginning of period (in dollars per share)     $ 18.42    
Granted (in dollars per share)     5.19    
Exercised (in dollars per share)     4.29    
Expired/cancelled (in dollars per share)     18.94    
Outstanding at end of period (in dollars per share) $ 17.11   17.11   $ 18.42
Exercisable at end of period (in dollars per share) $ 19.19   $ 19.19    
Weighted Average Remaining Contractual Life          
Outstanding (in years)     7 years 7 months 6 days   8 years
Exercisable (in years)     6 years 9 months 18 days    
Aggregate Intrinsic Value          
Outstanding at end of period $ 606   $ 606   $ 2,910
Exercisable at end of period 196   196    
Additional disclosures          
Allocated Share-based Compensation Expense 849 $ 2,033 2,642 $ 4,152  
Total compensation cost related to non-vested options not yet recognized $ 10,704   $ 10,704    
Weighted average period to recognize compensation cost related to non-vested options not yet recognized     2 years 1 month 6 days