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Property, Plant and Mine Development, net - Summary of Property, Equipment and Mine Development (Details) - USD ($) $ in Thousands | Jun. 30, 2018 | Dec. 31, 2017
--- | --- | ---
Property, equipment and mine development - net |  |
Property and equipment, gross | $ 141,164 | $ 125,318
Accumulated depreciation, depletion and amortization | (50,040) | (42,719)
Total property, equipment and mine development - net | 91,124 | 82,599
Asset and development costs | 11,300 | 7,400
Capital lease obligations | 1,551 | 1,600
Accrued capital expenditures | 2,000 | 1,000
Asset retirement costs |  |
Property, equipment and mine development - net |  |
Property and equipment, gross | 969 | 1,079
Construction-in-progress |  |
Property, equipment and mine development - net |  |
Property and equipment, gross | 17,844 | 10,838
Furniture and office equipment |  |
Property, equipment and mine development - net |  |
Property and equipment, gross | 1,711 | 1,664
Land |  |
Property, equipment and mine development - net |  |
Property and equipment, gross | 242 | 242
Light vehicles and other mobile equipment |  |
Property, equipment and mine development - net |  |
Property and equipment, gross | 2,244 | 2,211
Machinery and equipment |  |
Property, equipment and mine development - net |  |
Property and equipment, gross | 23,960 | 22,916
Mill facilities and infrastructure |  |
Property, equipment and mine development - net |  |
Property and equipment, gross | 10,817 | 10,075
Mineral Interests And Mineral Rights |  |
Property, equipment and mine development - net |  |
Property and equipment, gross | 17,958 | 17,658
Mine development |  |
Property, equipment and mine development - net |  |
Property and equipment, gross | 63,760 | 56,957
Software and licenses |  |
Property, equipment and mine development - net |  |
Property and equipment, gross | $ 1,659 | $ 1,678

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