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Selected quarterly financial data (unaudited) (Tables) | 12 Months Ended
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Dec. 31, 2017
Quarterly Financial Information Disclosure [Abstract] |
Selected Quarterly Financial Data | Summarized quarterly financial data for the years ended December 31, 2017 and 2016, are set forth in the following tables:
|  | March 31 |  |  | June 30 |  |  | September 30 |  |  | December 31 |
|  | (In thousands, except per share data) |
2017 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Net revenues |  | $ | 3,009 |  |  | $ | 2,163 |  |  | $ | 2,043 |  |  | $ | 4,530 |
Net (loss) |  | $ | (16,324 | ) |  | $ | (35,339 | ) |  | $ | (32,886 | ) |  |  | (32,784 | )
Net (loss) per share — basic |  | $ | (0.17 | ) |  | $ | (0.35 | ) |  | $ | (0.31 | ) |  | $ | (0.28 | )
Net (loss) per share — diluted |  | $ | (0.17 | ) |  | $ | (0.35 | ) |  | $ | (0.31 | ) |  | $ | (0.28 | )
Weighted average common shares used to compute basic net (loss) per share |  |  | 95,744 |  |  |  | 99,864 |  |  |  | 104,703 |  |  |  | 116,451 |
Weighted average common shares used to compute diluted net (loss) per share |  |  | 95,744 |  |  |  | 99,864 |  |  |  | 104,703 |  |  |  | 116,451 |
2016 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Net revenues |  | $ | — |  |  | $ | — |  |  | $ | 162,354 |  |  | $ | 12,404 |
Net income (loss) |  | $ | (24,873 | ) |  | $ | (29,959 | ) |  | $ | 126,520 |  |  | $ | 53,976 |
Net income (loss) per share — basic |  | $ | (0.29 | ) |  | $ | (0.33 | ) |  | $ | 1.32 |  |  | $ | 0.56 |
Net income (loss) per share — diluted |  |  | (0.29 | ) |  | $ | (0.33 | ) |  |  | 1.31 |  |  |  | 0.56 |
Weighted average common shares used to compute basic net income (loss) per share |  |  | 85,771 |  |  |  | 91,061 |  |  |  | 95,627 |  |  |  | 95,676 |
Weighted average common shares used to compute diluted net income (loss) per share |  |  | 85,771 |  |  |  | 91,061 |  |  |  | 96,548 |  |  |  | 96,510 |

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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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