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Quarterly Financial Information (Unaudited) (Tables) | 12 Months Ended
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Dec. 31, 2017
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, 2017 |  | June 30, 2017 |  | September 30, 2017 |  | December 31, 2017 |
Revenue |  | $ | — |  | $ | — |  | $ | 250 |  | $ | 250 |
Operating expenses |  |  | 7,761 |  |  | 6,919 |  |  | 7,202 |  |  | 5,712 |
Net loss |  |  | (7,876 | ) |  | (6,974 | ) |  | (7,017 | ) |  | (5,497 | )
Net loss per share: |  |  |  |  |  |  |  |  |  |  |  |  |
Basic and Diluted |  | $ | (0.41 | ) | $ | (0.32 | ) | $ | (0.31 | ) | $ | (0.24 | )
Weighted-average common shares outstanding used in net loss per share: |  |  |  |  |  |  |  |  |  |  |  |  |
Basic and Diluted |  |  | 19,093,273 |  |  | 21,796,194 |  |  | 22,563,174 |  |  | 23,218,476 |
|  | Three Months Ended |
|  | March 31, 2016 |  | June 30, 2016 |  | September 30, 2016 |  | December 31, 2016 |
Operating expenses |  | $ | 9,206 |  | $ | 9,396 |  | $ | 8,283 |  | $ | 8,673 |
Net loss |  |  | (9,418 | ) |  | (9,445 | ) |  | (8,419 | ) |  | (8,778 | )
Net loss per share: |  |  |  |  |  |  |  |  |  |  |  |  |
Basic and Diluted |  | $ | (0.61 | ) | $ | (0.61 | ) | $ | (0.54 | ) | $ | (0.47 | )
Weighted-average common shares outstanding used in net loss per share: |  |  |  |  |  |  |  |  |  |  |  |  |
Basic and Diluted |  |  | 15,335,516 |  |  | 15,373,964 |  |  | 15,512,608 |  |  | 18,699,480 |

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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/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 270 -SubTopic 10 -Section 50 -Paragraph 1 -Subparagraph (a)-(j) -URI http://asc.fasb.org/extlink&oid=84173487&loc=d3e1280-108306 + Details
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