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Property, Plant and Equipment - Schedule of Mineral Property Expenditures (Details) - USD ($) $ in Thousands | 12 Months Ended
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Dec. 31, 2016 | Dec. 31, 2015
Total expense for the period | $ 3,248 | $ 4,470
Temrezli Project Turkey [Member] |  |
Total expense for the period | 498 | 407
Total Turkey Projects [Member] |  |
Total expense for the period | 498 | 407
Kingsville Dome Project Texas [Member] |  |
Total expense for the period | 779 | 812
Rosita Project Texas [Member] |  |
Total expense for the period | 402 | 711
Vasquez Project Texas [Member] |  |
Total expense for the period | 461 | 510
Butler Ranch Project Texas [Member] |  |
Total expense for the period | 12 | 443
Other Projects Texas [Member] |  |
Total expense for the period | 94 | 553
Total Texas Projects [Member] |  |
Total expense for the period | 1,748 | 3,029
Crownpoint Project New Mexico [Member] |  |
Total expense for the period | 5 | 5
Churchrock Project New Mexico [Member] |  |
Total expense for the period | 20 | 21
Cebolleta Project New Mexico [Member] |  |
Total expense for the period | 138 | 537
Juan Tafoya Project New Mexico [Member] |  |
Total expense for the period | 47 | 384
Other Projects New Mexico [Member] |  |
Total expense for the period | 5 | 87
Total New Mexico Projects [Member] |  |
Total expense for the period | 215 | 1,034
Columbus Basin Project, Nevada [Member] |  |
Total expense for the period | 232 |
Other Projects, Nevada [Member] |  |
Total expense for the period | 31 |
Total Nevada Projects [Member] |  |
Total expense for the period | 263 |
Sal Rica Project, Utah [Member] |  |
Total expense for the period | 524 |
Total Utah Projects [Member] |  |
Total expense for the period | $ 524 |

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