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Loan Payable - Additional Information (Detail) (USD $) | 1 Months Ended | 3 Months Ended | 6 Months Ended
--- | --- | --- | ---
Jan. 31, 2014 | Jul. 31, 2013 | Apr. 30, 2013 | Sep. 30, 2012 | Jun. 30, 2014 | Jun. 30, 2014
Debt Instrument [Line Items] |  |  |  |  |  |
Proceeds from loan |  |  |  |  |  |
Loan term |  |  |  |  |  | 3 years
Annual interest rate on loan |  |  |  |  | 6.00% | 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
Proceeds received under loan agreement |  |  |  |  |  | 9,900,000
Initial carrying amount assigned to loan, net of discount |  |  |  |  | 9,512,000 | 9,512,000
Fair value allocated to warrant |  |  |  |  | 388,000 | 388,000
Cash discount |  |  |  |  | 100,000 | 100,000
Note issuance costs |  |  |  |  |  | 117,000
Deferred financing costs, discount and accretion percentage |  |  |  |  |  | 9.00%
CIRM [Member] |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |
Proceeds from loan |  |  |  |  |  |
Loan term |  |  |  | 10 years |  |
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 |  |
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 |  |  |  |
Silicon Valley Bank Loan Agreement Warrant [Member] |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |
Term of warrant expiration |  |  |  |  |  | 10 years
Exercise price of warrant |  |  |  |  | 1.7034 | 1.7034
Warrant expiration period |  |  |  |  |  | April 2023
Silicon Valley Bank Loan Agreement Warrant [Member] | Common Stock [Member] |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |
Number of shares of common stock acquired using warrant |  |  |  |  | 293,531 | 293,531
Silicon Valley Bank [Member] |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |
Proceeds from loan |  |  | $ 9,900,000 |  |  |

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