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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 | 6 Months Ended
--- | --- | --- | ---
May 31, 2014 | Jun. 30, 2017 | Jun. 30, 2016 | Jun. 30, 2017 | Jun. 30, 2016
Research and Development Arrangement, Contract to Perform for Others [Line Items] |  |  |  |  |
Research grants |  | $ 276,000 | $ 110,000 | $ 395,000 | $ 341,000
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 | 0 | 0
Collaboration agreement related costs and expenses |  | $ 100,000 | $ 400,000 | $ 300,000 | $ 700,000

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