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Major Customers, Partnerships and Strategic Alliances - California Institute for Regenerative Medicine - Additional Information (Detail) - USD ($) $ in Thousands	1 Months Ended			3 Months Ended		6 Months Ended
	May. 31, 2014	May. 31, 2013	Oct. 31, 2009	Jun. 30, 2015	Jun. 30, 2014	Jun. 30, 2015	Jun. 30, 2014
Research and Development Arrangement, Contract to Perform for Others [Line Items]
Research grants				$ 557	$ 664	$ 1,377	$ 1,212
California Institute for Regenerative Medicine [Member]
Research and Development Arrangement, Contract to Perform for Others [Line Items]
Funds due under the agreement	$ 5,600		$ 14,500
Expected amount to be received for research and development			$ 5,200
Agreement to receive	4 years		4 years
Agreement date						Oct. 31, 2009
Research grants				0	0	$ 0	0
Collaboration agreement related costs and expenses				400	0	700	0
California Institute for Regenerative Medicine [Member] \| Beta-thalassemia [Member]
Research and Development Arrangement, Contract to Perform for Others [Line Items]
Funds due under the agreement		$ 6,400
Agreement to receive		4 years
Research grants				500	300	1,200	700
Collaboration agreement related costs and expenses				500	400	1,200	700
Unused funds received						$ 3,000
Period for repayment of unused funds						90 days
License agreement terms [Member]
Research and Development Arrangement, Contract to Perform for Others [Line Items]
Research grants				0	0	$ 0	0
Collaboration agreement related costs and expenses				$ 0	$ 700	$ 200	$ 1,000