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Condensed Consolidated Statements of Operations (USD $) In Thousands, except Per Share data, unless otherwise specified | 3 Months Ended | 9 Months Ended
--- | --- | ---
Sep. 30, 2013 | Sep. 30, 2012 | Sep. 30, 2013 | Sep. 30, 2012
Revenues: |  |  |  |
Collaboration revenue | $ 1,110 | $ 1,050 | $ 3,349 | $ 3,602
Grant revenue | 1,700 | 1,219 | 3,855 | 3,188
Service and license revenue | 117 | 605 | 1,200 | 1,118
Total | 2,927 | 2,874 | 8,404 | 7,908
Operating expenses: |  |  |  |
Research and development | 11,770 | 12,850 | 38,739 | 36,631
General and administrative | 5,807 | 7,121 | 22,243 | 18,871
Unoccupied facility expense | 918 |  | 918 |
Total operating expenses | 18,495 | 19,971 | 61,900 | 55,502
Loss from operations | (15,568) | (17,097) | (53,496) | (47,594)
Interest income | 37 | 91 | 163 | 208
Interest expense | (24) | (589) | (83) | (1,765)
Other expense | (120) | (196) | (248) | (255)
Net loss | $ (15,675) | $ (17,791) | $ (53,664) | $ (49,406)
Basic and diluted net loss per share | $ (0.09) | $ (0.10) | $ (0.29) | $ (0.30)
Weighted-average shares used to compute basic and diluted net loss per share | 183,022 | 177,870 | 182,960 | 167,039

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- Definition Revenue from multiple-deliverable arrangements that include licensing fees and services revenue. Licensing revenue is consideration received from another party for the right to use, but not own, certain of the entity's intangible assets. Licensing arrangements include, but are not limited to, rights to use a patent, copyright, technology, manufacturing process, software or trademark. Licensing fees are generally, but not always, fixed as to amount and not dependent upon the revenue generated by the licensing party. An entity may receive licensing fees for licenses that also generate royalty payments to the entity. Services revenue may be derived by providing other, nonspecified, services during the reporting period. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 03 -Paragraph 1 -Article 5 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 225 -SubTopic 10 -Section S99 -Paragraph 2 -Subparagraph (SX 210.5-03.1(d),(e)) -URI http://asc.fasb.org/extlink&oid=26872669&loc=d3e20235-122688 + Details
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