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OTHER COMMITMENTS AND CONTINGENCIES - NARRATIVE (Details)
3 Months Ended 12 Months Ended
Nov. 12, 2018
USD ($)
Dec. 15, 2017
USD ($)
Nov. 06, 2017
USD ($)
Dec. 31, 2018
USD ($)
Dec. 31, 2017
USD ($)
Dec. 31, 2018
USD ($)
Dec. 31, 2017
USD ($)
Dec. 31, 2016
USD ($)
Oct. 31, 2015
USD ($)
ft²
Other Commitments [Line Items]                  
Purchase commitments for inventories       $ 3,000,000   $ 3,000,000      
Severance and related expense       $ 700,000 $ 1,500,000 741,000 $ 1,524,000 $ 0  
Operational cash outflows           (21,011,000) $ (3,704,000) $ (2,837,000)  
Chief Financial Officer                  
Other Commitments [Line Items]                  
Severance and related expense $ 741,000                
Chief Commercialization Officer                  
Other Commitments [Line Items]                  
Severance and related expense     $ 582,000            
Operational cash outflows           397,000      
Chief Executive Officer                  
Other Commitments [Line Items]                  
Severance and related expense   $ 767,000              
Operational cash outflows           $ 670,000      
Sophia, Bulgaria                  
Other Commitments [Line Items]                  
Monthly cost of office space                 $ 6,000
Area of real estate property (in square feet) | ft²                 20,000