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Major Customers, Partnerships and Strategic Alliances - California Institute for Regenerative Medicine - Additional Information (Detail) (USD $) | 3 Months Ended | 9 Months Ended | 1 Months Ended | 3 Months Ended | 9 Months Ended
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Sep. 30, 2014 | Sep. 30, 2013 | Sep. 30, 2014 | Sep. 30, 2013 | Oct. 31, 2009 California Institute for Regenerative Medicine [Member] | May 31, 2013 California Institute for Regenerative Medicine [Member] Beta-thalassemia [Member] | Sep. 30, 2014 California Institute for Regenerative Medicine [Member] Beta-thalassemia [Member] | Sep. 30, 2014 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 |  |  |  |  | $ 14,500,000 | $ 6,400,000 |  |
Expected amount to be received for research and development |  |  |  |  | 5,200,000 |  |  |
Agreement to receive |  |  |  |  | 4 years | 4 years |  |
Agreement date |  |  |  |  | Oct. 31, 2009 |  |  |
Revenues under agreement | 372,000 | 882,000 | 1,584,000 | 2,199,000 |  |  | 400,000 | 1,100,000
Collaboration agreement related costs and expenses |  |  |  |  |  |  | $ 400,000 | $ 1,100,000

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