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Research Funding	9 Months Ended
Research Funding	Sep. 30, 2019
Research Funding [Abstract]
Research Funding	Research Funding California Institute of Regenerative Medicine Grant Award In February 2017, CIRM awarded us funds of up to $12.2 million to support the T-Rex Study. The funding is based upon the achievement of certain milestones related to the proportion of subjects enrolled in California, as well as manufacturing and development costs incurred in California. In March 2018, CIRM calculated the precise amount of the funding award as $8.6 million, based on the actual number of subjects enrolled in California. The Company received $5.7 million in initial funding in May 2017, a $1.9 million milestone payment in December 2017, a $0.3 million progress payment in March 2018, and a $0.2 million progress payment in May 2019, of which the total will be amortized over the estimated award period through July 2020 as a reduction to the related research and development expenses. As of September 30, 2019, $2.3 million of the funding received was recorded in accrued liabilities. During the three and nine months ended September 30, 2019, the Company amortized and recognized $0.7 million and $2.0 million in credits, respectively, to research and development related to CIRM funds received. During the three and nine months ended September 30, 2018, the Company amortized and recognized $0.6 million and $1.9 million in credits, respectively, to research and development related to CIRM funds received.