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Selected Quarterly Data (Unaudited) (Tables) | 12 Months Ended
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Dec. 31, 2019
Quarterly Financial Information Disclosure [Abstract] |
Selected Quarterly Data (unaudited) | The following tables contain quarterly financial information for 2019 and 2018 (in thousands). The Company believes that the following information reflects all normal recurring adjustments necessary for a fair presentation of the information for the periods presented. The operating results for any quarter are not necessarily indicative of results for any future period.
|  | 2019 Quarter Ended |
|  | March 31 |  |  | June 30 |  |  | September 30 |  |  | December 31 |
Revenue |  | $ | 338 |  |  | $ | 350 |  |  | $ | 305 |  |  | $ | 1,231 |
Operating expenses |  |  | 14,035 |  |  |  | 13,445 |  |  |  | 14,443 |  |  |  | 14,710 |
Loss from operations |  |  | (13,697 | ) |  |  | (13,095 | ) |  |  | (14,138 | ) |  |  | (13,479 | )
Net loss |  |  | (12,946 | ) |  |  | (12,344 | ) |  |  | (13,285 | ) |  |  | (12,798 | )
Net loss per share - basic and diluted |  | $ | (0.51 | ) |  | $ | (0.45 | ) |  | $ | (0.39 | ) |  | $ | (0.37 | )
|  | 2018 Quarter Ended |
|  | March 31 |  |  | June 30 |  |  | September 30 |  |  | December 31 |
Revenue |  | $ | 354 |  |  | $ | 254 |  |  | $ | 1,801 |  |  | $ | 111 |
Operating expenses |  |  | 11,990 |  |  |  | 15,606 |  |  |  | 13,335 |  |  |  | 12,819 |
Loss from operations |  |  | (11,636 | ) |  |  | (15,352 | ) |  |  | (11,534 | ) |  |  | (12,708 | )
Net loss |  |  | (11,165 | ) |  |  | (14,591 | ) |  |  | (10,748 | ) |  |  | (11,931 | )
Net loss per share - basic and diluted |  | $ | (0.55 | ) |  | $ | (0.59 | ) |  | $ | (0.43 | ) |  | $ | (0.47 | )

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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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