Revenue, Deferred Revenue and Related Costs (Details) $ / shares in Units, shares in Millions		3 Months Ended		9 Months Ended
	Aug. 02, 2017 USD ($) item $ / shares shares	Sep. 30, 2017 USD ($)	Sep. 30, 2016 USD ($)	Sep. 30, 2017 USD ($)	Sep. 30, 2016 USD ($)
Oxide plant lease		$ 1,771,000	$ 1,729,000	$ 5,107,000	$ 4,768,000
Lease related costs		619,000	$ 549,000	1,704,000	1,478,000
Oxide Plant
Oxide plant lease				5,100,000	4,800,000
Lease related costs				1,700,000	$ 1,500,000
Renewal term	2 years
Expected lease proceeds	$ 1,000,000			4,600,000
Gross proceeds from common stock sale	$ 1,000,000
Common stock issued (in shares) | shares	1.8
Sale price (in dollars per shares) | $ / shares	$ 0.55
Volume weighted average stock price period	30 days
Termination notice period	120 days
Number of rights of first refusal | item	1
Deferred revenue		$ 1,000,000		1,000,000
Legal and stock exchange issuance fees				$ 71,000