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Commitments and Contingencies - Future Minimum Payments Under All Leases and Bond Payable (Parenthetical) (Detail) (USD $) In Millions, unless otherwise specified | 1 Months Ended | 12 Months Ended
--- | --- | ---
Apr. 30, 2013 | Sep. 30, 2012 | Dec. 31, 2013
Loss Contingencies [Line Items] |  |  |
Loan term |  |  | 3 years
CIRM Loan Agreement [Member] |  |  |
Loss Contingencies [Line Items] |  |  |
Proceeds from initial disbursement of the loan |  |  | $ 3.8
Approval of fund by California Institute for Regenerative Medicine (CIRM) | $ 19.3 |  |
Approval of fund by California Institute for Regenerative Medicine (CIRM) maximum period |  | 4 years | 4 years
Loan term |  | 10 years | 10 years

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- Definition Approval of fund to Collaborators + References No definition available. + Details
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- Definition Period of time between issuance and maturity of debt instrument, in PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days. + References No definition available. + Details
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- Details
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