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License Agreement	6 Months Ended
License Agreement	Jun. 30, 2018
Related Party Transactions [Abstract]
License Agreement	License Agreement On May 10, 2017, the Company announced that it has entered into a License Agreement (License Agreement) with Innovative Cellular Therapeutics CO., LTD. (ICT), a leading cell therapy company and developer of CAR-T cell therapy for cancer treatment, for the development and distribution of the Company's product portfolio in Greater China, South Korea, Singapore, and other countries in Asia. ICT acquired an exclusive license to certain patent rights, know-how and intellectual property relating to Carticel, MACI, ixmyelocel-T, and Epicel. The remaining variable consideration, which is related to the development and commercialization milestones and royalty based payments, is monitored for completion and related revenue recognition as discussed in note 4.