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Research Funding	12 Months Ended
Research Funding	Dec. 31, 2017
Research and Development [Abstract]
Research Funding	Research Funding California Institute of Regenerative Medicine Grant Award In February 2017, the California Institute for Regenerative Medicine ("CIRM") awarded us funds of up to $12.2 million to support the T-Rex Study. The funding will be 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. We received $5.7 million in initial funding in May 2017, and a $1.9 million milestone payment in December 2017, 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 December 31, 2017, $2.4 million of the funding received is recorded in accrued liabilities, representing the amount expected to be recognized over the next 12 months, and $3.9 million of the funding received is recorded in other long-term liabilities. During the year ended December 31, 2017, the Company amortized and recognized a $1.3 million credit to research and development related to CIRM funds received.