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COLLABORATIVE AGREEMENT	6 Months Ended
	Jun. 30, 2011
Organization, Consolidation and Presentation of Financial Statements [Abstract]
Collaborative Arrangement Disclosure [Text Block]	4. COLLABORATIVE AGREEMENT In June 2009, we entered into a worldwide exclusive license and alliance agreement with GE Healthcare UK, Limited (GEHC) to develop and commercialize cellular assay products derived from human embryonic stem cells (hESCs) for use in drug discovery, development and toxicity screening. Under the terms of the agreement, GEHC has been granted an exclusive license under Geron’s intellectual property portfolio covering the growth and differentiation of hESCs, as well as a sublicense under Geron’s rights to the hESC patents held by the Wisconsin Alumni Research Foundation. We established a multi-year alliance program with GEHC under which scientists from both companies worked to develop hESC-based products for drug discovery. The first product developed under the alliance, human cardiomyocytes derived from hESCs, was launched in October 2010 by GEHC. In connection with the agreement, we received upfront non-refundable license payments under the exclusive license and sublicense and can receive milestone payments upon achievement of certain commercial development and product sales events and royalties on future product sales. Under the alliance program, GEHC was responsible for all costs incurred by GEHC and all costs incurred by us for activities undertaken at Geron, including the funding of our scientists who worked on the alliance program. An Alliance Steering Committee, with representatives from each company, coordinated and managed the alliance program. License payments under the GEHC agreement were recorded as deferred revenue upon receipt and were recognized ratably as revenue over the alliance program period as a result of our continuing involvement with the collaboration. Funding received for our efforts under the alliance program was recognized as revenue as costs were incurred, which reflected our level of effort over the period of the alliance program. Since the milestone payments are subject to substantive contingencies, any such payments will be recognized upon completion of the specified milestones. Royalties received under the agreement will generally be recognized as revenue upon receipt of the related royalty payment. For the three and six months ended June 30, 2011, we recognized $150,000 and $300,000, respectively, as revenue from collaborative agreements compared to $225,000 and $450,000 for the comparable 2010 periods. For the three and six months ended June 30, 2011and 2010, we recognized $175,000 and $350,000, respectively, as license fee revenue in connection with this agreement.

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- Definition

The entire disclosure for collaborative arrangements in which the entity is a participant, including a) information about the nature and purpose of such arrangements; b) its rights and obligations thereunder; c) the accounting policy for collaborative arrangements; and d) the income statement classification and amounts attributable to transactions arising from the collaborative arrangement between participants.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Emerging Issues Task Force (EITF)
-Number 07-1
-Paragraph 21
-LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy.

Reference 2: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 808
-SubTopic 10
-Section 50
-Paragraph 1
-URI http://asc.fasb.org/extlink&oid=6931272&loc=SL5834143-161434

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