GEOGRAPHIC AND SEGMENT INFORMATION - Schedule of Segment Reporting Information (Details) - USD ($) $ 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
Net property, plant and equipment	$ 20,505		$ 20,505		$ 20,553
Restricted cash	3,768		3,768		3,732
Notes receivable, non-current					1,493
Operating lease right of use assets	541		541
Total long-term assets	24,814		24,814		25,778
Mineral property expenses	824	$ 969	1,458	$ 1,751
General and administrative	2,054	2,054	3,890	3,859
General and administrative expenses	2,061		3,879
Sales and marketing expenses	7		11
Acquisition related expenses		(422)		333
Accretion of asset retirement costs	30	134	156	268	993
Impairment of uranium properties		17,968		17,968
Depreciation and amortization	25	33	48	67
Total operating expenses	2,933	20,736	5,552	24,246
Loss from operations	(2,933)	(20,736)	(5,552)	(24,246)
Other (expense) income	158	279	(397)	370
Loss before taxes	(2,775)	(20,457)	(5,949)	(23,876)
Corporate
Net property, plant and equipment	138		138		162
Operating lease right of use assets	517		517
Total long-term assets	655		655		162
General and administrative		1,364		2,717
General and administrative expenses	1,570		2,849
Acquisition related expenses		(422)		333
Depreciation and amortization	1	1	2	2
Total operating expenses	1,571	943	2,851	3,052
Loss from operations	(1,571)	(943)	(2,851)	(3,052)
Other (expense) income	158	172	(397)	253
Loss before taxes	(1,413)	(771)	(3,248)	(2,799)
Uranium
Net property, plant and equipment	11,395		11,395		11,418
Restricted cash	3,758		3,758		3,722
Notes receivable, non-current					1,493
Operating lease right of use assets	24		24
Total long-term assets	15,177		15,177		16,633
Mineral property expenses	805	830	1,358	1,604
General and administrative		453		905
General and administrative expenses	433		825
Accretion of asset retirement costs	30	134	156	268
Impairment of uranium properties		17,968		17,968
Depreciation and amortization	24	31	46	64
Total operating expenses	1,292	19,416	2,385	20,809
Loss from operations	(1,292)	(19,416)	(2,385)	(20,809)
Other (expense) income		107		117
Loss before taxes	(1,292)	(19,309)	(2,385)	(20,692)
Lithium
Mineral property expenses	2	130	3	138
Total operating expenses	2	130	3	138
Loss from operations	(2)	(130)	(3)	(138)
Loss before taxes	(2)	(130)	(3)	(138)
Graphite
Net property, plant and equipment	8,972		8,972		8,973
Restricted cash	10		10		10
Total long-term assets	8,982		8,982		$ 8,983
Mineral property expenses	17	9	97	9
General and administrative		237		237
General and administrative expenses	58		205
Sales and marketing expenses	7		11
Depreciation and amortization		1		1
Total operating expenses	68	247	313	247
Loss from operations	(68)	(247)	(313)	(247)
Loss before taxes	$ (68)	$ (247)	$ (313)	$ (247)