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Commitments and Contingencies - Future Minimum Payments Under All Leases and Loan Payable (Parenthetical) (Detail) - USD ($) | 1 Months Ended | 12 Months Ended | 14 Months Ended
--- | --- | --- | ---
Feb. 28, 2015 | Apr. 30, 2013 | Dec. 31, 2015 | Aug. 31, 2014
Loss Contingencies [Line Items] |  |  |  |
Proceeds from principal and accrued interest |  |  | $ 9,200,000 |
CIRM [Member] |  |  |  |
Loss Contingencies [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 |  |  |

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