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Merger and Financing - Merger with Histogenics (Details) - USD ($)
$ in Millions
Oct. 31, 2019
Oct. 04, 2019
May 08, 2019
Mar. 31, 2020
Level 2        
Merger and Financing        
Quoted price of assets held for sale of NeoCart       $ 7.0
Histogenics        
Merger and Financing        
Asset purchase agreement, cash consideration   $ 7.0 $ 6.5  
Percentage of increase in purchase price of asset per month (in percentage) 10.00%