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CASH AND CASH EQUIVALENTS AND RESTRICTED CASH (Details)
$ in Thousands, $ in Millions
6 Months Ended
Mar. 29, 2019
USD ($)
Dec. 20, 2018
CAD ($)
Dec. 20, 2018
USD ($)
Dec. 19, 2017
CAD ($)
Dec. 19, 2017
USD ($)
Jun. 30, 2019
USD ($)
Dec. 31, 2018
USD ($)
Jun. 30, 2018
USD ($)
Dec. 31, 2017
USD ($)
Cash and cash equivalents           $ 9,325 $ 15,756    
Restricted cash           13,112 14,685    
Restricted cash included in other long-term assets           48 48    
Total cash, cash equivalents, and restricted cash           22,485 $ 30,489 $ 19,697 $ 37,153
Net proceeds $ 20,300         22,900      
Common Stock                  
Net proceeds           20,300      
Warrants                  
Net proceeds           $ 2,600      
Flow Through Common Shares                  
Net proceeds   $ 20.0 $ 14,900 $ 12.9 $ 10,000