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Commitments and Contingencies - Additional Information (Detail) | 1 Months Ended | 12 Months Ended
--- | --- | ---
Mar. 31, 2015 USD ($) ft² | Oct. 31, 2013 GBP (£) | Mar. 31, 2013 USD ($) | Dec. 31, 2010 USD ($) | Dec. 31, 2015 USD ($) | Dec. 31, 2014 USD ($) | Dec. 31, 2013 USD ($)
Commitment And Contingencies [Line Items] |  |  |  |  |  |  |
Proceeds from the issuance of industrial revenue bonds |  |  |  |  | $ 5,000,000 |  |
Period of maturity |  |  |  |  | 2014-08 |  |
Proceeds from sale of property, plant and equipment | $ 149,000 |  |  |  | $ 168,713 | $ 3,500 | $ 38,500
Deferred rent under sublease agreement |  |  |  |  | 132,338 | 85,925 |
Pilot Manufacturing Facility [Member] |  |  |  |  |  |  |
Commitment And Contingencies [Line Items] |  |  |  |  |  |  |
Facility square-feet | ft² | 21,000 |  |  |  |  |  |
Cell Processing Facility [Member] |  |  |  |  |  |  |
Commitment And Contingencies [Line Items] |  |  |  |  |  |  |
Facility square-feet | ft² | 3,000 |  |  |  |  |  |
BMR-Gateway Boulevard LLC [Member] |  |  |  |  |  |  |
Commitment And Contingencies [Line Items] |  |  |  |  |  |  |
Term of lease |  |  |  | 11 years 6 months |  |  |
Rent over term of lease |  |  |  | $ 17,869,000 |  |  |
Deferred rent under sublease agreement |  |  |  |  | 1,372,000 | 1,434,000 |
Prologis, L.P [Member] |  |  |  |  |  |  |
Commitment And Contingencies [Line Items] |  |  |  |  |  |  |
Term of lease |  |  | 10 years |  |  |  |
Rent over term of lease |  |  | $ 3,497,000 |  |  |  |
Deferred rent under sublease agreement |  |  |  |  | $ 382,000 | $ 391,000 |
Stem Cell Sciences (U.K.) Ltd [Member] |  |  |  |  |  |  |
Commitment And Contingencies [Line Items] |  |  |  |  |  |  |
Term of lease |  | 3 years |  |  |  |  |
Rental payments under the existing lease | £ |  | £ 53,000 |  |  |  |  |
Lease termination date |  |  |  |  | Oct. 31, 2015 |  |

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