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Selected Quarterly Data (unaudited) (Tables) | 12 Months Ended
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Dec. 31, 2018
Quarterly Financial Information Disclosure [Abstract] |
Selected Quarterly Data (unaudited) | The following tables contain quarterly financial information for 2018 and 2017 (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.
|  | 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 attributable to common stockholders - basic and diluted |  | $ | (0.55 | ) |  | $ | (0.59 | ) |  | $ | (0.43 | ) |  | $ | (0.47 | )
|  | 2017 Quarter Ended |
|  | March 31 |  |  | June 30 |  |  | September 30 |  |  | December 31 |
Revenue |  | $ | 111 |  |  | $ | 2,111 |  |  | $ | 111 |  |  | $ | 111 |
Operating expenses |  |  | 7,485 |  |  |  | 11,568 |  |  |  | 12,186 |  |  |  | 12,029 |
Loss from operations |  |  | (7,374 | ) |  |  | (9,457 | ) |  |  | (12,075 | ) |  |  | (11,918 | )
Net loss |  |  | (7,368 | ) |  |  | (9,388 | ) |  |  | (11,924 | ) |  |  | (11,697 | )
Net loss per share attributable to common stockholders - basic and diluted |  | $ | — |  |  | $ | (4.70 | ) |  | $ | (1.66 | ) |  | $ | (0.74 | )
Net loss per unit attributable to common unit holders - basic and diluted |  | $ | (4.49 | ) |  | $ | — |  |  | $ | — |  |  | $ | — |

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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=109225645&loc=d3e1280-108306 + Details
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