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Loan Payable - Summary of Changes in Carrying Value of Loan Payable (Detail) (USD $) | 1 Months Ended | 12 Months Ended
--- | --- | ---
Apr. 30, 2013 | Dec. 31, 2013
Debt Instrument [Line Items] |  |
Loan proceeds |  | $ 13,820,264
Cash discount |  | (100,000)
Fair value of warrants issued |  | (387,576)
Initial carrying value |  | 13,332,688
Repayment of principal |  | (620,215)
Accretion of discount |  | 196,771
Carrying value of total loan payable at 12/31/2013 (current and non-current) |  | 12,909,244
Carrying value of loan payable, current portion |  | 3,664,370
Carrying value of loan payable, non-current portion |  | 9,244,874
Carrying value of total loan payable at 12/31/2013 (current and non-current) |  | 12,909,244
Silicon Valley Bank [Member] |  |
Debt Instrument [Line Items] |  |
Loan proceeds | 9,900,000 | 10,000,000
Cash discount |  | (100,000)
Fair value of warrants issued |  | (387,576)
Initial carrying value |  | 9,512,424
Repayment of principal |  | (620,215)
Accretion of discount |  | 196,771
Carrying value of total loan payable at 12/31/2013 (current and non-current) |  | 9,088,980
Carrying value of loan payable, current portion |  | 3,664,370
Carrying value of loan payable, non-current portion |  | 5,424,610
Carrying value of total loan payable at 12/31/2013 (current and non-current) |  | 9,088,980
CIRM Loan Agreement [Member] |  |
Debt Instrument [Line Items] |  |
Loan proceeds |  | 3,820,264
Cash discount |  |
Fair value of warrants issued |  |
Initial carrying value |  | 3,820,264
Repayment of principal |  |
Accretion of discount |  |
Carrying value of total loan payable at 12/31/2013 (current and non-current) |  | 3,820,264
Carrying value of loan payable, current portion |  |
Carrying value of loan payable, non-current portion |  | 3,820,264
Carrying value of total loan payable at 12/31/2013 (current and non-current) |  | $ 3,820,264

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- Definition Fair value of warrants issued. + References No definition available. + Details
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- Definition Long Term Debt Carrying Value + References No definition available. + Details
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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 SEC -Name Regulation S-X (SX) -Number 210 -Section 02 -Paragraph 22 -Article 5 + Details
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- Definition The amount of debt discount that was originally recognized at the issuance of the instrument that has yet to be amortized. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 835 -SubTopic 30 -Section 45 -Paragraph 1A -URI http://asc.fasb.org/extlink&oid=6451184&loc=d3e28541-108399 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 835 -SubTopic 30 -Section 55 -Paragraph 8 -URI http://asc.fasb.org/extlink&oid=6584090&loc=d3e28878-108400 + 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 SEC -Name Regulation S-X (SX) -Number 210 -Section 02 -Paragraph 20 -Article 5 Reference 2: 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 SEC -Name Regulation S-X (SX) -Number 210 -Section 02 -Paragraph 22 -Article 5 Reference 2: 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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- Definition Cash received from principal payments made on loans related to operating activities. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 25 -Subparagraph (c) -URI http://asc.fasb.org/extlink&oid=31042434&loc=d3e3536-108585 + Details
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