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Selected Quarterly Financial Data (Unaudited - in thousands except per share data) (Tables) | 12 Months Ended
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Dec. 31, 2017
Selected Quarterly Financial Data (Unaudited - in thousands except per share data) |
Schedule of selected quarterly financial data | Selected Quarterly Financial Data (Unaudited — in thousands except per share data)
|  | Quarters Ended |
|  | March 31 |  | June 30 |  | September 30 |  | December 31 |
2017 |  |  |  |  |  |  |  |  |  |  |  |  |
Net loss |  | $ | (54,992 | ) | $ | (48,136 | ) | $ | (111,666 | ) | $ | (69,208 | )
Basic and diluted net loss per common share (1) |  | $ | (0.39 | ) | $ | (0.34 | ) | $ | (0.69 | ) | $ | (0.42 | )
2016 |  |  |  |  |  |  |  |  |  |  |  |  |
Net loss |  | $ | (43,691 | ) | $ | (51,050 | ) | $ | (46,654 | ) | $ | (58,647 | )
Basic and diluted net loss per common share (1) |  |  | (0.35 | ) |  | (0.40 | ) |  | (0.33 | ) |  | (0.41 | )
(1) | Per common share amounts for the quarters and full years have been calculated separately. Accordingly, quarterly amounts do not add to the annual amounts because of differences on the weighted-average common shares outstanding during each period principally due to the effect of the Company issuing shares of its common stock during the year.

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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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