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SEGMENT INFORMATION - Schedule of Segment Reporting Information, by Segment (Details) - USD ($)
 3 Months Ended 12 Months Ended
Dec. 31, 2016
Sep. 30, 2016
Dec. 31, 2015
Dec. 31, 2016
Dec. 31, 2015
Dec. 31, 2014
Segment Reporting Information [Line Items]            
Revenue $ 54,552,000   $ 61,351,000 $ 54,552,000 $ 61,351,000 $ 46,253,000
Costs and expenses applicable to revenue 35,453,000     35,453,000 37,617,000 29,907,000
Impairment of inventories 5,362,000     5,362,000 0 0
Development, permitting and land holding 21,118,000     21,118,000 8,762,000 1,488,000
Standby costs 10,234,000     10,234,000 10,765,000 5,140,000
Abandonment of mineral properties 1,036,000     1,036,000 2,770,000 0
Accretion of asset retirement obligation 906,000     906,000 494,000 412,000
Selling costs 379,000     379,000 316,000 279,000
Intangible asset amortization 3,319,000     3,319,000 5,364,000 3,893,000
General and administration 15,519,000     15,519,000 12,325,000 11,341,000
Costs directly attributable to acquisitions       0 6,886,000 0
Impairment of plant and equipment and mineral properties (Note 10)       0 8,224,000 80,071,000
Impairment of goodwill (Note 10)       0 47,730,000 0
Total operating loss (38,774,000)     $ (38,774,000) (79,902,000) $ (86,278,000)
Operating Segments | Conventional            
Segment Reporting Information [Line Items]            
Revenue 43,884,000       48,448,000  
Costs and expenses applicable to revenue 27,176,000       28,161,000  
Impairment of inventories 2,364,000        
Development, permitting and land holding 9,774,000       1,312,000  
Standby costs 9,847,000       10,765,000  
Abandonment of mineral properties 0       2,300,000  
Accretion of asset retirement obligation 723,000       414,000  
Selling costs 379,000       316,000  
Intangible asset amortization 1,100,000       2,372,000  
General and administration 3,880,000       1,648,000  
Costs directly attributable to acquisitions         0  
Impairment of plant and equipment and mineral properties (Note 10)         7,757,000  
Impairment of goodwill (Note 10)         0  
Total operating loss (11,359,000)       (6,597,000)  
Operating Segments | ISR            
Segment Reporting Information [Line Items]            
Revenue 10,668,000       12,903,000  
Costs and expenses applicable to revenue 8,277,000       9,456,000  
Impairment of inventories   $ 2,998,000      
Development, permitting and land holding 11,344,000       7,450,000  
Standby costs 387,000       0  
Abandonment of mineral properties 1,036,000       0  
Accretion of asset retirement obligation 183,000       80,000  
Selling costs 0       0  
Intangible asset amortization 2,219,000       2,992,000  
General and administration 1,547,000       1,867,000  
Costs directly attributable to acquisitions         0  
Impairment of plant and equipment and mineral properties (Note 10)         467,000  
Impairment of goodwill (Note 10)         47,730,000  
Total operating loss (17,323,000)       (57,609,000)  
Corporate & Other            
Segment Reporting Information [Line Items]            
Revenue 0       0  
Costs and expenses applicable to revenue 0       0  
Impairment of inventories 0        
Development, permitting and land holding 0       0  
Standby costs 0       0  
Abandonment of mineral properties 0       0  
Accretion of asset retirement obligation 0       0  
Selling costs 0       0  
Intangible asset amortization 0       0  
General and administration 10,092,000       8,810,000  
Costs directly attributable to acquisitions         6,886,000  
Impairment of plant and equipment and mineral properties (Note 10)         0  
Impairment of goodwill (Note 10)         0  
Total operating loss $ (10,092,000)       $ (15,696,000)