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Net Loss Per Share (Tables) | 12 Months Ended
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Dec. 31, 2015
Earnings Per Share [Abstract] |
Schedule of Anti-dilutive Securities Excluded from Calculation of Diluted Net Loss Per Share | The following securities were excluded from the calculation of diluted net loss per share because their effect would have been anti-dilutive for the periods presented (in thousands):
|  | Years Ended December 31, |
|  | 2015 |  |  | 2014 |  |  | 2013 |
Senior Preferred Stock |  |  | — |  |  |  | — |  |  |  | 15,336 |
Junior Preferred Stock |  |  | — |  |  |  | — |  |  |  | 18,584 |
Employee stock options |  |  | 13,583 |  |  |  | 14,427 |  |  |  | 11,084 |
RSUs outstanding |  |  | 865 |  |  |  | 560 |  |  |  | — |
Warrants |  |  | 7 |  |  |  | 173 |  |  |  | 173 |
FibroGen Europe Preferred stock |  |  | — |  |  |  | — |  |  |  | 959 |
|  |  | 14,455 |  |  |  | 15,160 |  |  |  | 46,136 |

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- Definition Tabular disclosure of securities (including those issuable pursuant to contingent stock agreements) that could potentially dilute basic earnings per share (EPS) in the future that were not included in the computation of diluted EPS because to do so would increase EPS amounts or decrease loss per share amounts for the period presented, by antidilutive securities. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 260 -SubTopic 10 -Section 50 -Paragraph 1 -Subparagraph (c) -URI http://asc.fasb.org/extlink&oid=6371337&loc=d3e3550-109257 + Details
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