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Loan Payable - Additional Information (Detail) (USD $) | 12 Months Ended |  | 1 Months Ended | 12 Months Ended | 1 Months Ended | 12 Months Ended |  | 1 Months Ended | 12 Months Ended
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Dec. 31, 2013 | Oct. 31, 2013 | Jul. 31, 2013 CIRM Loan Agreement [Member] | Apr. 30, 2013 CIRM Loan Agreement [Member] | Sep. 30, 2012 CIRM Loan Agreement [Member] | Dec. 31, 2013 CIRM Loan Agreement [Member] | Jan. 31, 2014 Subsequent Events [Member] CIRM Loan Agreement [Member] | Dec. 31, 2013 Silicon Valley Bank Loan Agreement Warrant [Member] | Dec. 31, 2013 Silicon Valley Bank Loan Agreement Warrant [Member] Common Stock [Member] | Apr. 30, 2013 Silicon Valley Bank [Member] | Dec. 31, 2013 Silicon Valley Bank [Member]
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |
Proceeds from loan | $ 13,820,264 |  |  |  |  | $ 3,820,264 |  |  |  | $ 9,900,000 | $ 10,000,000
Loan term | 3 years |  |  |  | 10 years | 10 years |  |  |  |  |
Annual interest rate on loan | 6.00% |  |  |  |  |  |  |  |  |  |
Period of loan subject to interest payments only | 6 months |  |  |  |  |  |  |  |  |  |
Period of loan subject to principal and interest payments | 30 months |  |  |  |  |  |  |  |  |  |
Final fee payment at the end of loan term | 1,000,000 |  |  |  |  |  |  |  |  |  |
Term of warrants expiration |  |  |  |  |  |  |  | 10 years |  |  |
Number of shares of common stock acquired using warrants |  |  |  |  |  |  |  |  | 293,531 |  |
Exercise price of warrants |  | 1.80 |  |  |  |  |  | 1.7034 |  |  |
Warrants expiration period |  |  |  |  |  |  |  | April 2023 |  |  |
Proceeds received under loan agreement | 9,900,000 |  |  |  |  |  |  |  |  |  |
Initial carrying amount assigned to loan, net of discount | 9,512,000 |  |  |  |  |  |  |  |  |  |
Fair value allocated to warrant | 388,000 |  |  |  |  |  |  |  |  |  |
Cash discount | 100,000 |  |  |  |  |  |  |  |  |  | 100,000
Note issuance costs | 117,000 |  |  |  |  |  |  |  |  |  |
Deferred financing costs, discount and accretion percentage | 9.00% |  |  |  |  |  |  |  |  |  |
Approval of fund by California Institute for Regenerative Medicine (CIRM) |  |  |  | 19,300,000 |  |  |  |  |  |  |
Approval of fund by California Institute for Regenerative Medicine (CIRM) maximum period |  |  |  |  | 4 years | 4 years |  |  |  |  |
Loan interest rate description |  |  |  |  |  | One year LIBOR rate plus two percent |  |  |  |  |
LIBOR rate plus percentage |  |  |  |  |  | 2.00% |  |  |  |  |
LIBOR rate plus percentage increase |  |  |  |  |  | 1.00% |  |  |  |  |
Proceeds from initial disbursement of the loan |  |  | $ 3,800,000 |  |  | $ 3,800,000 | $ 3,800,000 |  |  |  |

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