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Research Funding	3 Months Ended
Research Funding	Mar. 31, 2018
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. We received $5.7 million in initial funding in May 2017, a $1.9 million milestone payment in December 2017, and $0.3 million progress payment in March 2018, 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 March 31, 2018, $2.6 million of the funding received is recorded in accrued liabilities, representing the amount expected to be recognized over the next 12 months, and $3.4 million of the funding received is recorded in other long-term liabilities. During the three months ended March 31, 2018, the Company amortized and recognized a $0.6 million credit to research and development related to CIRM funds received.