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Selected Quarterly Financial Data (Unaudited) (Tables) | 12 Months Ended
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Dec. 31, 2019
Quarterly Financial Information Disclosure [Abstract] |
Unaudited Selected Quarterly Financial Data | The following tables provide the unaudited selected quarterly financial data for the years ended December 31, 2019 and 2018 (in thousands, except per share data). We believe that the following information reflects all normal recurring adjustments necessary for a fair statement of the information for the periods presented. The operating results for any quarter are not necessarily indicative of results of any future period.
|  | 2019
|  | First Quarter (1) |  | Second Quarter (1) |  | Third Quarter (1) |  | Fourth Quarter
Total revenue |  | $ | 16,025 |  |  | $ | 13,083 |  |  | $ | 17,046 |  |  | $ | 14,055 |
Total operating expenses |  | 157,665 |  |  | 156,792 |  |  | 146,861 |  |  | 144,611 |
Loss from operations |  | (141,640 | ) |  | (143,709 | ) |  | (129,815 | ) |  | (130,556 | )
Net loss per share attributable to common stockholders - basic and diluted |  | $ | (0.40 | ) |  | $ | (0.41 | ) |  | $ | (0.37 | ) |  | $ | (0.37 | )
|  | 2018
|  | First Quarter |  | Second Quarter |  | Third Quarter |  | Fourth Quarter
Total revenue |  | $ | 29,039 |  |  | $ | 28,851 |  |  | $ | 41,757 |  |  | $ | 35,421 |
Total operating expenses |  | 106,441 |  |  | 125,866 |  |  | 127,575 |  |  | 188,452 |
Loss from operations |  | (77,402 | ) |  | (97,015 | ) |  | (85,818 | ) |  | (153,031 | )
Net loss per share attributable to common stockholders - basic and diluted |  | $ | (1.16 | ) |  | $ | (1.43 | ) |  | $ | (1.32 | ) |  | $ | (1.14 | )
_______ (1) As a result of our adoption of ASC 842 as of January 1, 2019 (Note 2), quarterly amounts presented in our prior Forms 10-Q were revised. Total operating expenses and Loss from operations were both adjusted by $0.2 million, $0.2 million and $1.0 million, for the first, second and third quarters of 2019, respectively.

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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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