Revenue and Related Costs (Details)	12 Months Ended
	Dec. 31, 2016 USD ($)	Dec. 31, 2015 USD ($) customer
Oxide plant lease	$ 6,400,000	$ 653,000
Lease related costs	2,046,000	199,000
Deferred revenue		500,000
Metals inventory	0	$ 0
Velardena properties
Number of customers | customer		3
Metals inventory	0	$ 0
In-process inventory	0	0
Oxide Plant
Oxide plant lease	6,400,000	700,000
Lease related costs	$ 2,000,000	200,000
Deferred revenue		$ 500,000