California Institute for Regenerative Medicine Disease Team Therapy Development Awards	12 Months Ended
Dec. 31, 2012
California Institute for Regenerative Medicine Disease Team Therapy Development Awards [Abstract]
California Institute for Regenerative Medicine Disease Team Therapy Development Awards	Note 18. California Institute for Regenerative Medicine Disease Team Therapy Development Awards In July 2012, the governing board of the California Institute for Regenerative Medicine (CIRM) approved our application for a Disease Team Therapy Development Research Award for the study of HuCNS-SC cells as a potential treatment for cervical spinal cord injury. Under this disease team program, CIRM would have provided up to $20 million in the form of a forgivable loan. However, in March 2013, we elected not to borrow these funds from CIRM. In September 2012, the governing board of CIRM approved a second award to us for up to $20 million under RFA 10-05. The award is to fund preclinical development of our proprietary HuCNS-SC cells in Alzheimer’s disease over a maximum four-year period, with the goal of filing an IND in that time. Negotiation of terms and conditions for this forgivable loan is on-going.

California Institute for Regenerative Medicine Disease Team Therapy Development Awards

12 Months Ended

Dec. 31, 2012

California Institute for Regenerative Medicine Disease Team Therapy Development Awards [Abstract]

California Institute for Regenerative Medicine Disease Team Therapy Development Awards

Note 18. California Institute for Regenerative Medicine Disease Team Therapy Development Awards

In July 2012, the governing board of the California Institute for Regenerative Medicine (CIRM) approved our application for a Disease Team Therapy Development Research Award for the study of HuCNS-SC cells as a potential treatment for cervical spinal cord injury. Under this disease team program, CIRM would have provided up to $20 million in the form of a forgivable loan. However, in March 2013, we elected not to borrow these funds from CIRM.

In September 2012, the governing board of CIRM approved a second award to us for up to $20 million under RFA 10-05. The award is to fund preclinical development of our proprietary HuCNS-SC cells in Alzheimer’s disease over a maximum four-year period, with the goal of filing an IND in that time. Negotiation of terms and conditions for this forgivable loan is on-going.