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Segment Reporting (Details) $ in Thousands | 3 Months Ended | 6 Months Ended | 12 Months Ended
--- | --- | --- | ---
Jun. 30, 2018 USD ($) | Jun. 30, 2017 USD ($) | Jun. 30, 2018 USD ($) segment | Jun. 30, 2017 USD ($) | Dec. 31, 2017 USD ($)
Number of reportable segments | segment |  |  | 2 |  |
Revenue | $ 30,768 | $ 21,391 | $ 62,919 | $ 45,727 |
Exploration expenses | 1,251 | 1,136 | 2,436 | 1,958 |
Net income (loss) | 3,754 | 864 | 9,211 | 5,240 | $ 4,150
Capital expenditures | 8,887 | $ 8,610 | 16,026 | 16,467 |
Accrued capital expenditures |  |  | (918) | (4,328) |
Non - cash additions |  |  |  | 1,321 |
Capital expenditures on a cash basis |  |  | 15,108 | $ 10,818 |
Assets | $ 146,149 |  | $ 146,149 |  | 132,923
Concentration risk | 94.00% | 94.00% | 94.00% | 94.00% |
Mexico |  |  |  |  |
Revenue | $ 30,768 | $ 21,391 | $ 62,919 | $ 45,727 |
Exploration expenses | 490 | 226 | 986 | 604 |
Net income (loss) | 7,036 | 3,629 | 15,624 | 10,066 |
Capital expenditures | 5,832 | 5,057 | 11,704 | 10,114 |
Assets | 98,736 |  | 98,736 |  | 87,739
Nevada |  |  |  |  |
Exploration expenses | 726 | 873 | 1,377 | 1,277 |
Net income (loss) | (791) | (874) | (1,499) | (1,286) |
Capital expenditures | 3,055 | 3,550 | 4,322 | 6,344 |
Assets | 30,181 |  | 30,181 |  | 25,741
Corporate and Other |  |  |  |  |
Exploration expenses | 35 | 37 | 73 | 77 |
Net income (loss) | (2,491) | (1,891) | (4,914) | (3,540) |
Capital expenditures |  | $ 3 |  | $ 9 |
Assets | $ 17,232 |  | $ 17,232 |  | $ 19,443

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