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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

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- Definition

Approval of fund to collaborators maximum validation period.

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No definition available.

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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.

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No definition available.

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- Definition

The cash inflow during the period from additional borrowings in aggregate debt. Includes proceeds from short-term and long-term debt.

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No definition available.

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