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Commitments and Contingencies - Future Minimum Payments Under All Leases and Loan Payable (Parenthetical) (Detail) - USD ($)	1 Months Ended		12 Months Ended	14 Months Ended
	Feb. 28, 2015	Apr. 30, 2013	Dec. 31, 2015	Aug. 31, 2014
Loss Contingencies [Line Items]
Proceeds from principal and accrued interest			$ 9,200,000
CIRM [Member]
Loss Contingencies [Line Items]
Approval of fund by California Institute for Regenerative Medicine (CIRM)		$ 19,300,000
Aggregate proceeds from disbursement of the loan				$ 9,600,000
Forgiveness of loan principal			8,917,000
Accrued interest forgiven			$ 243,000
Repayment of aggregate loan proceeds received	$ 679,000

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Decrease for amounts of indebtedness forgiven by the holder of the debt instrument.

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Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 235
-SubTopic 10
-Section S99
-Paragraph 1
-Subparagraph (SX 210.4-08.(f))
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Increase for accrued, but unpaid interest on the debt instrument for the period.

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-Name Accounting Standards Codification
-Topic 235
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The cash outflow during the period from the repayment of aggregate short-term and long-term debt. Excludes payment of capital lease obligations.

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