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UNAUDITED SUPPLEMENTARY QUARTERLY INFORMATION (Tables) | 12 Months Ended
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Dec. 31, 2019
UNAUDITED SUPPLEMENTARY QUARTERLY INFORMATION |
Summary of unaudited supplementary quarterly information | ​
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
​ | ​ | 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
​
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
​ | ​ | Three months ended |
​ |  | March 31, 2018 |  | June 30, 2018 |  | September 30, 2018 |  | December 31, 2018 |
​ | ​ | (unaudited) (in thousands, except per share) |
Revenue from gold and silver sales | ​ | $ | 41,041 | ​ | $ | 33,806 | ​ | $ | 26,896 | ​ | $ | 26,432 | ​
Gross profit | ​ | ​ | 14,228 | ​ | ​ | 9,092 | ​ | ​ | 6,013 | ​ | ​ | 2,749 | ​
Net (loss) | ​ | ​ | (5,211) | ​ | ​ | (5,380) | ​ | ​ | (13,290) | ​ | ​ | (20,989) | ​
Net (loss) per share: | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
Basic and diluted | ​ | $ | (0.02) | ​ | $ | (0.02) | ​ | $ | (0.04) | ​ | $ | (0.06) | ​
Weighted average shares outstanding: | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
Basic and diluted | ​ |  | 337,062 | ​ | ​ | 337,087 | ​ | ​ | 337,278 | ​ |  | 337,936 | ​

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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=118952077&loc=d3e1280-108306 + Details
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