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Property, Plant and Mine Development, net - Summary of Property, Equipment and Mine Development (Details) - USD ($) $ in Thousands | Sep. 30, 2021 | Dec. 31, 2020
--- | --- | ---
Property, equipment and mine development - net |  |  |
Property and equipment, gross | [1] | $ 167,632 | $ 153,595
Accumulated depreciation and amortization |  | (101,315) | (91,084)
Total property, equipment and mine development - net |  | 66,317 | 62,511
Accrued capital expenditures |  | 1,000 | 1,000
Asset retirement costs |  |  |
Property, equipment and mine development - net |  |  |
Property and equipment, gross |  | 1,071 | 1,064
Construction-in-progress |  |  |
Property, equipment and mine development - net |  |  |
Property and equipment, gross |  | 13,265 | 7,158
Furniture and office equipment |  |  |
Property, equipment and mine development - net |  |  |
Property and equipment, gross |  | 1,896 | 1,839
Land |  |  |
Property, equipment and mine development - net |  |  |
Property and equipment, gross |  | 230 | 230
Light vehicles and other mobile equipment |  |  |
Property, equipment and mine development - net |  |  |
Property and equipment, gross |  | 2,236 | 2,192
Machinery and equipment |  |  |
Property, equipment and mine development - net |  |  |
Property and equipment, gross |  | 33,083 | 31,227
Mill facilities and infrastructure |  |  |
Property, equipment and mine development - net |  |  |
Property and equipment, gross |  | 24,455 | 24,407
Mine Development |  |  |
Property, equipment and mine development - net |  |  |
Property and equipment, gross |  | 89,760 | 83,859
Software and licenses |  |  |
Property, equipment and mine development - net |  |  |
Property and equipment, gross |  | $ 1,636 | $ 1,619
[1] | Includes accrued capital expenditures of $1.0 million both at September 30, 2021 and December 31, 2020.

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