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California Institute of Regenerative Medicine Award (Details) - California Institute of Regenerative Medicine - USD ($)
3 Months Ended 12 Months Ended
Dec. 31, 2015
Sep. 18, 2015
Dec. 31, 2015
Dec. 31, 2015
Collaborative Arrangements and Non-collaborative Arrangement Transactions [Line Items]        
Proceeds from award received for project   $ 19,919,449    
Proceeds from project initiation payment     $ 4,000,000  
Future milestone payments receivable $ 15,919,449      
Debt interest rate during period       25.00%
Accrued interest $ 133,905   $ 133,905 $ 133,905
LIBOR        
Collaborative Arrangements and Non-collaborative Arrangement Transactions [Line Items]        
Debt basis spread on variable rate       0.61%