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Restructuring Costs	12 Months Ended
	Dec. 31, 2015
Restructuring and Related Activities [Abstract]
Restructuring Costs	Note 10. Restructuring Costs On December 18, 2015, we committed to a strategic realignment to fully focus our resources on our proprietary HuCNS-SC platform technology for the treatment of chronic spinal cord injury. As part of our strategic realignment, we have suspended further enrollment of patients in our Phase II Radiant Study in geographic atrophy of age-related macular degeneration, while we seek a partner to fund continued development of HuCNS-SC cells as a potential treatment of retinal disorders. We intend to continue following patients already treated in the study through their 12-month follow up visits. As part of the realignment, we initiated a reduction in our workforce by 17 full-time employees, or approximately 25% of our workforce. In connection with the reduction in workforce, we recorded a one-time charge for severance and related expenses of approximately $392,000 in the fourth quarter of 2015. The $392,000 is part of our accrued expenses and accrued liabilities on our accompanying consolidated balance sheets and is classified as wind-down expenses in our consolidated statement of operations. We disbursed the severance payments in the first quarter of 2016.

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- Definition

The entire disclosure for restructuring and related activities. Description of restructuring activities such as exit and disposal activities, include facts and circumstances leading to the plan, the expected plan completion date, the major types of costs associated with the plan activities, total expected costs, the accrual balance at the end of the period, and the periods over which the remaining accrual will be settled.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 420
-SubTopic 10
-Section S99
-Paragraph 2
-Subparagraph (SAB TOPIC 5.P.4)
-URI http://asc.fasb.org/extlink&oid=27011515&loc=d3e140904-122747

Reference 2: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 420
-SubTopic 10
-Section S99
-Paragraph 1
-Subparagraph (SAB TOPIC 5.P.3)
-URI http://asc.fasb.org/extlink&oid=27011515&loc=d3e140864-122747

Reference 3: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 420
-SubTopic 10
-Section 50
-Paragraph 1
-URI http://asc.fasb.org/extlink&oid=6394359&loc=d3e17939-110869

Reference 4: http://www.xbrl.org/2003/role/presentationRef
-Publisher SEC
-Name Staff Accounting Bulletin (SAB)
-Number Topic 5
-Section P
-Subsection 3, 4

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