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Loan Payable - Additional Information (Detail) - USD ($) | 1 Months Ended | 3 Months Ended | 6 Months Ended | 14 Months Ended
--- | --- | --- | --- | ---
Mar. 31, 2016 | Feb. 28, 2015 | Apr. 30, 2013 | Jun. 30, 2016 | Jun. 30, 2016 | Aug. 31, 2014
Debt Instrument [Line Items] |  |  |  |  |  |
Term of warrant | 5 years |  |  |  |  |
Reclassification of principal amount to other income |  |  |  | $ 8,917,000 |  |
Reclassification of accrued interest to gain on extinguishment of loan |  |  |  | 243,000 |  |
CIRM [Member] |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |
Approval of fund by California Institute for Regenerative Medicine (CIRM) |  |  | $ 19,300,000 |  |  |
Aggregate proceeds from disbursement of the loan |  |  |  |  |  | $ 9,600,000
Forgiveness of loan principal |  | $ 8,917,000 |  |  |  |
Accrued interest forgiven |  | 243,000 |  |  |  |
Repayment of aggregate loan proceeds received |  | $ 679,000 |  |  |  |
Reclassification of principal amount to other income |  |  |  | 8,917,000 |  |
Reclassification of accrued interest to gain on extinguishment of loan |  |  |  | $ 243,000 |  |
Silicon Valley Bank Loan Agreement Warrant [Member] |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |
Term of warrant |  |  |  |  | 10 years |
Exercise price of warrants |  |  |  | $ 1.7034 | $ 1.7034 |
Warrant expiration period |  |  |  |  | 2023-04 |
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 Loan Agreement [Member] |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |
Proceeds from loan |  |  | 9,900,000 |  |  |
Cash discount |  |  | $ 100,000 | $ 100,000 | $ 100,000 |
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 |
Note issuance costs |  |  |  |  | $ 117,000 |
Deferred financing costs, discount and accretion percentage |  |  |  |  | 9.00% |
Silicon Valley Bank Loan Agreement [Member] | Restricted Money Market Account [Member] |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |
Debt instrument, collateral amount |  |  |  | $ 2,422,500 | $ 2,422,500 |

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