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Major Customers, Partnerships and Strategic Alliances - California Institute for Regenerative Medicine - Additional Information (Detail)

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Major Customers, Partnerships and Strategic Alliances - California Institute for Regenerative Medicine - Additional Information (Detail) - USD ($)
1 Months Ended 3 Months Ended
May 31, 2014
Mar. 31, 2017
Mar. 31, 2016
Research and Development Arrangement, Contract to Perform for Others [Line Items]      
Research grants   $ 119,000 $ 231,000
California Institute for Regenerative Medicine [Member]      
Research and Development Arrangement, Contract to Perform for Others [Line Items]      
Funds due under the agreement $ 5,600,000    
Agreement to receive 4 years    
Research grants   0 0
Collaboration agreement related costs and expenses   $ 200,000 $ 300,000