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Collaborative and Other Agreements (Narrative) (Details) - USD ($) | 3 Months Ended | 9 Months Ended | 12 Months Ended
--- | --- | --- | ---
Sep. 30, 2016 | Sep. 30, 2015 | Sep. 30, 2016 | Sep. 30, 2015 | Dec. 31, 2013
Collaborative Arrangements and Non-collaborative Arrangement Transactions [Line Items] |  |  |  |  |
Licensing Payments Received | $ 29,000 | $ 143,000 | $ 238,000 | $ 347,000 |
Intrexon Corporation [Member] |  |  |  |  |
Collaborative Arrangements and Non-collaborative Arrangement Transactions [Line Items] |  |  |  |  |
Fees Payable Upon Commencement Of The First Phase 2 Trial | 2,500,000 |  | 2,500,000 |  |
Fees Payable Upon First Regulatory Approval | 5,000,000 |  | 5,000,000 |  |
Expenses Incurred Under Channel Collaborative Agreement | 0 | 37,000 | 76,000 | 81,000 |
Cash Paid For Channel Collaboration Agreement | 0 | 40,000 | 117,000 | 75,000 |
Liability for amounts due to terminated channel collaboration partner | 15,000 |  | 15,000 |  |
University Of Leicester [Member] |  |  |  |  |
Collaborative Arrangements and Non-collaborative Arrangement Transactions [Line Items] |  |  |  |  |
Expenses Incurred Under Channel Collaborative Agreement | 41,000 | 68,000 | 127,000 | 156,000 |
Cash Paid For Channel Collaboration Agreement | 0 | 55,000 | 140,000 | 219,000 |
University Of Glasgow [Member] |  |  |  |  |
Collaborative Arrangements and Non-collaborative Arrangement Transactions [Line Items] |  |  |  |  |
Expenses Incurred Under Channel Collaborative Agreement | 0 | 0 | 0 | 13,000 |
Cash Paid For Channel Collaboration Agreement | 0 | 0 | 0 | 61,000 |
Walter Reed Army Institute Of Research [Member] |  |  |  |  |
Collaborative Arrangements and Non-collaborative Arrangement Transactions [Line Items] |  |  |  |  |
Payments For Services Under Collaborative Agreement | 0 | 0 | 0 | $ 0 |
Takara Bio Inc [Member] |  |  |  |  |
Collaborative Arrangements and Non-collaborative Arrangement Transactions [Line Items] |  |  |  |  |
Licensing Payments Received |  | $ 40,000 |  |  |
Patent license agreement revenue | $ 4,000 |  | $ 11,000 |  |
Takara Bio Inc [Member] | Nonsoftware License Arrangement [Member] |  |  |  |  |
Collaborative Arrangements and Non-collaborative Arrangement Transactions [Line Items] |  |  |  |  |
Percent of License Product Sales Receivable |  |  | 12.00% |  |
Percent of License Product Service Revenues Receivable |  |  | 6.00% |  |
Minimum Annual Royalty Payments Receivable |  |  | $ 15,000 |  |
Takara Bio Inc [Member] | Nonsoftware License Arrangement [Member] | Criteria One [Member] |  |  |  |  |
Collaborative Arrangements and Non-collaborative Arrangement Transactions [Line Items] |  |  |  |  |
Contingent Licensing Receivable |  |  | 30,000 |  |
Licensed Product Revenues Milestone Benchmark |  |  | 1,000,000 |  |
Takara Bio Inc [Member] | Nonsoftware License Arrangement [Member] | Criteria Two [Member] |  |  |  |  |
Collaborative Arrangements and Non-collaborative Arrangement Transactions [Line Items] |  |  |  |  |
Contingent Licensing Receivable |  |  | 40,000 |  |
Licensed Product Net Sales Milestone Benchmark |  |  | $ 2,000,000 |  |
Common Stock [Member] | Intrexon Corporation [Member] |  |  |  |  |
Collaborative Arrangements and Non-collaborative Arrangement Transactions [Line Items] |  |  |  |  |
Stock Issued During Period, Value, Issued for Services |  |  |  |  | $ 3,000,000

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