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Research Funding	3 Months Ended
Research Funding	Mar. 31, 2020
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 the Company 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. In March 2018, CIRM calculated the precise amount of the funding award as $8.1 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 $200,000 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 March 31, 2020, $0.9 million of the funding received was recorded in accrued liabilities. During the three months ended March 31, 2020 and March 31, 2019, the Company amortized and recognized $0.7 million and $0.6 million in credits, respectively, to research and development related to CIRM funds received.