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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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