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Selected quarterly financial data (unaudited) (Tables) | 12 Months Ended
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Dec. 31, 2014
Selected Quarterly Financial Data | Summarized quarterly financial data for the years ended December 31, 2014 and 2013 are set forth in the following tables:
|  | March 31 |  |  | June 30 |  |  | September 30 |  |  | December 31 |
|  | (In thousands, except per share data) |
2014 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Net loss |  | $ | (52,056 | ) |  | $ | (73,365 | ) |  | $ | (36,520 | ) |  | $ | (36,439 | )
Net loss per share — basic and diluted |  | $ | (0.14 | ) |  | $ | (0.19 | ) |  | $ | (0.09 | ) |  | $ | (0.09 | )
Weighted average common shares used to compute basic and diluted net loss per share |  |  | 368,784 |  |  |  | 380,770 |  |  |  | 394,163 |  |  |  | 396,793 |
|  | March 31 |  |  | June 30 |  |  | September 30 |  |  | December 31 |
|  | (In thousands, except per share data) |
2013 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Net loss |  | $ | (40,965 | ) |  | $ | (46,124 | ) |  | $ | (50,818 | ) |  | $ | (53,582 | )
Net loss per share — basic and diluted |  | $ | (0.15 | ) |  | $ | (0.16 | ) |  | $ | (0.17 | ) |  | $ | (0.16 | )
Weighted average common shares used to compute basic and diluted net loss per share |  |  | 280,058 |  |  |  | 284,044 |  |  |  | 296,386 |  |  |  | 337,284 |

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- Definition Tabular disclosure of the quarterly financial data in the annual financial statements. The disclosure includes financial information for each fiscal quarter for the current and previous year, including revenues, gross profit, income (loss) before extraordinary items and 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=35737889&loc=d3e1280-108306 + Details
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