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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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- Definition 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 + Details
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- Definition 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 -SubTopic 210 -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 + Details
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- Definition 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. + References 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 + Details
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- Definition 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. + References 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) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 + Details
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