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Quarterly Financial Data (Unaudited) (Tables) | 12 Months Ended
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Dec. 31, 2017
Quarterly Financial Information Disclosure [Abstract] |
Selected quarterly financial data | Set forth below is selected quarterly financial data for each of the quarters in the years ended December 31, 2017 and 2016.
|  | 2017 Quarters Ended |
(in thousands, except per share amounts) |  | March 31 |  |  | June 30 |  |  | September 30 |  |  | December 31 |
Revenue |  | $ | 743 |  |  | $ | 584 |  |  | $ | 684 |  |  | $ | 704 |
Costs and expenses |  |  | 4,736 |  |  |  | 5,050 |  |  |  | 5,139 |  |  |  | 5,254 |
Operating loss |  |  | (4,212 | ) |  |  | (4,601 | ) |  |  | (4,627 | ) |  |  | (4,725 | )
Net loss |  |  | (11,332 | ) |  |  | (1,943 | ) |  |  | (12,596 | ) |  |  | (19,246 | )
Basic loss per share |  |  | 43,750 |  |  |  | 1,750 |  |  |  | 4,680 |  |  |  | 375 |
|  | 2016 Quarters Ended |
(in thousands, except per share amounts) |  | March 31 |  |  | June 30 |  |  | September 30 |  |  | December 31 |
Revenue |  | $ | 370 |  |  | $ | 511 |  |  | $ | 435 |  |  | $ | 676 |
Costs and expenses |  |  | 3,721 |  |  |  | 4,232 |  |  |  | 5,047 |  |  |  | 4,882 |
Operating loss |  |  | (3,462 | ) |  |  | (3,871 | ) |  |  | (4,724 | ) |  |  | (4,383 | )
Net loss |  |  | (1,813 | ) |  |  | (6,667 | ) |  |  | (1,004 | ) |  |  | (8,486 | )
Basic loss per share |  |  | 218,750 |  |  |  | 771,750 |  |  |  | 115,495 |  |  |  | 646,010 |

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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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