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Loan Payable - Summary of Changes in Carrying Value of Loan Payable (Detail) - USD ($)	12 Months Ended
	Dec. 31, 2015	Dec. 31, 2015	Dec. 31, 2014
Debt Instrument [Line Items]
Carrying value of loan payable (current and non-current) Beginning Balance	$ 15,020,417
Repayment of principal		$ (4,778,485)
Accretion of discount	92,097
Carrying value of loan payable (current and non-current) Ending Balance	10,334,029
Carrying value of loan payable, current portion		1,417,388	$ 4,686,388
Carrying value of loan payable, non-current portion		8,916,641	10,334,029
Total loan payable	15,020,417	10,334,029	15,020,417
CIRM [Member]
Debt Instrument [Line Items]
Carrying value of loan payable (current and non-current) Beginning Balance	9,595,807
Repayment of principal		(679,166)
Carrying value of loan payable (current and non-current) Ending Balance	8,916,641
Carrying value of loan payable, non-current portion		8,916,641
Total loan payable	9,595,807	8,916,641	9,595,807
Silicon Valley Bank Loan Agreement [Member]
Debt Instrument [Line Items]
Carrying value of loan payable (current and non-current) Beginning Balance	5,424,610
Repayment of principal		(4,099,319)
Accretion of discount	92,097
Carrying value of loan payable (current and non-current) Ending Balance	1,417,388
Carrying value of loan payable, current portion		1,417,388
Total loan payable	$ 5,424,610	$ 1,417,388	$ 5,424,610

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Accretion Of Debt Discount Net Carrying Amount

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Amount of the total principal payments made during the annual reporting period.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 210
-SubTopic 10
-Section S99
-Paragraph 1
-URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682

Reference 2: http://www.xbrl.org/2003/role/presentationRef
-Publisher SEC
-Name Regulation S-X (SX)
-Number 210
-Section 02
-Paragraph 22
-Article 5

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Including the current and noncurrent portions, aggregate carrying value as of the balance sheet date of loans payable (with maturities initially due after one year or beyond the operating cycle if longer).

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 942
-SubTopic 210
-Section S99
-Paragraph 1
-Subparagraph (SX 210.9-03.16)
-URI http://asc.fasb.org/extlink&oid=6876686&loc=d3e534808-122878

Reference 2: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 944
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-Section S99
-Paragraph 1
-Subparagraph (SX 210.7-03.16(a)(2))
-URI http://asc.fasb.org/extlink&oid=6879938&loc=d3e572229-122910

Reference 3: http://www.xbrl.org/2003/role/presentationRef
-Publisher SEC
-Name Regulation S-X (SX)
-Number 210
-Section 02
-Paragraph 19, 20, 22
-Article 5

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Carrying value as of the balance sheet date of portion of long-term loans payable due within one year or the operating cycle if longer.

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Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 210
-SubTopic 10
-Section S99
-Paragraph 1
-Subparagraph (SX 210.5-02.20)
-URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682

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Carrying value as of the balance sheet date of loans payable (with maturities initially due after one year or beyond the operating cycle if longer), excluding current portion.

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Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 210
-SubTopic 10
-Section S99
-Paragraph 1
-Subparagraph (SX 210.5-02.22)
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