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Quarterly Financial Information (Unaudited) (Tables) | 12 Months Ended
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Dec. 31, 2019
Quarterly Financial Information (unaudited) |
Summary of unaudited quarterly results of operations | Quarterly Financial Information (unaudited, in thousands, except share and per share data)
|  | Three Months Ended
|  | March 31, |  | June 30, |  | September 30, |  | December 31,
|  | 2019 |  | 2019 |  | 2019 |  | 2019
Operating expenses |  | $ | 6,334 |  | $ | 7,325 |  | $ | 6,682 |  | $ | 6,747
Net loss |  |  | (6,038) |  |  | (7,131) |  |  | (6,514) |  |  | (6,610)
Net loss per share: |  |  |  |  |  |  |  |  |  |  |  |
Basic and Diluted |  | $ | (0.62) |  | $ | (0.62) |  | $ | (0.56) |  | $ | (0.55)
Weighted-average common shares outstanding used in net loss per share: |  |  |  |  |  |  |  |  |  |  |  |
Basic and Diluted |  |  | 9,686,224 |  |  | 11,505,542 |  |  | 11,624,232 |  |  | 11,950,674
|  | Three Months Ended
|  | March 31, |  | June 30, |  | September 30, |  | December 31,
|  | 2018 |  | 2018 |  | 2018 |  | 2018
Operating expenses |  | $ | 7,639 |  | $ | 6,636 |  | $ | 6,008 |  | $ | 6,088
Net loss |  |  | (7,652) |  |  | (6,479) |  |  | (5,679) |  |  | (6,060)
Net loss per share: |  |  |  |  |  |  |  |  |  |  |  |
Basic and Diluted |  | $ | (2.88) |  | $ | (1.98) |  | $ | (0.80) |  | $ | 0.85
Weighted-average common shares outstanding used in net loss per share: |  |  |  |  |  |  |  |  |  |  |  |
Basic and Diluted |  |  | 2,655,584 |  |  | 3,272,877 |  |  | 7,103,841 |  |  | 7,115,507

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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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