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UNAUDITED SUPPLEMENTARY QUARTERLY INFORMATION (Tables) | 12 Months Ended
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Dec. 31, 2020
UNAUDITED SUPPLEMENTARY QUARTERLY INFORMATION |
Summary of unaudited supplementary quarterly information | ​
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
​ | ​ | Three months ended
​ |  | March 31, 2020 |  | June 30, 2020 |  | September 30, 2020 |  | December 31, 2020
​ | ​ | (unaudited) (in thousands, except per share)
Revenue from gold and silver sales | ​ | $ | 31,400 | ​ | $ | 18,291 | ​ | $ | 27,395 | ​ | $ | 27,703
Gross (loss) | ​ | ​ | (3,685) | ​ | ​ | (8,875) | ​ | ​ | (701) | ​ | ​ | (13,687)
Net (loss) | ​ | ​ | (99,191) | ​ | ​ | (19,814) | ​ | ​ | (9,778) | ​ | ​ | (23,542)
Net (loss) per share: | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
Basic and diluted | ​ | $ | (0.25) | ​ | $ | (0.05) | ​ | $ | (0.02) | ​ | $ | (0.06)
Weighted average shares outstanding: | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
Basic and diluted | ​ | ​ | 400,370 | ​ | ​ | 400,513 | ​ | ​ | 403,887 | ​ | ​ | 408,959
​
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
​ | ​ | Three months ended |
​ |  | March 31, 2019 |  | June 30, 2019 |  | September 30, 2019 |  | December 31, 2019 |
​ | ​ | (unaudited) (in thousands, except per share) |
Revenue from gold and silver sales | ​ | $ | 15,583 | ​ | $ | 36,383 | ​ | $ | 32,691 | ​ | $ | 32,362 | ​
Gross profit | ​ | ​ | 1,429 | ​ | ​ | 4,677 | ​ | ​ | 1,619 | ​ | ​ | 1,261 | ​
Net (loss) | ​ | ​ | (10,136) | ​ | ​ | (13,014) | ​ | ​ | (11,465) | ​ | ​ | (25,132) | ​
Net (loss) per share: | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
Basic and diluted | ​ | $ | (0.02) | ​ | $ | (0.04) | ​ | $ | (0.03) | ​ | $ | (0.07) | ​
Weighted average shares outstanding: | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
Basic and diluted | ​ |  | 345,497 | ​ | ​ | 346,998 | ​ | ​ | 362,175 | ​ |  | 378,543 | ​

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- Definition Tabular disclosure of quarterly financial data. Includes, but is not limited to, financial information for fiscal quarters, cumulative effect of a change in accounting principle and earnings per share data. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 270 -SubTopic 10 -Section 50 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=121640914&loc=d3e1280-108306 + Details
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