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California Institute for Regenerative Medicine Loan - Additional Information (Detail) (USD $) In Millions, unless otherwise specified | 1 Months Ended | 6 Months Ended
--- | --- | ---
Apr. 30, 2013 | Sep. 30, 2012 | Jun. 30, 2013
Collaborative Arrangements and Non-collaborative Arrangement Transactions [Line Items] |  |  |
Approval of fund by California Institute for Regenerative Medicine (CIRM) | $ 19.3 |  |
Loan term |  | 10 years |
Loan interest rate description |  |  | one year LIBOR rate plus two percent
LIBOR rate plus percentage |  |  | 2.00%
LIBOR rate plus percentage increase |  |  | 1.00%
Alzheimers Disease [Member] |  |  |
Collaborative Arrangements and Non-collaborative Arrangement Transactions [Line Items] |  |  |
Approval of fund by California Institute for Regenerative Medicine (CIRM) maximum period |  | 4 years |
Spinal Cord Injury [Member] |  |  |
Collaborative Arrangements and Non-collaborative Arrangement Transactions [Line Items] |  |  |
Approval of fund by California Institute for Regenerative Medicine (CIRM) maximum period | 4 years |  |

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