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U.S. Government Agreement, Joint Venture and Collaborations (Narrative) (Details) - USD ($) $ in Thousands | 1 Months Ended | 12 Months Ended | 42 Months Ended | 59 Months Ended |  |
--- | --- | --- | --- | --- | --- | ---
Sep. 30, 2015 | Jun. 30, 2015 | Mar. 31, 2015 | Dec. 31, 2015 | Dec. 31, 2014 | Dec. 31, 2013 | Dec. 31, 2015 | Dec. 31, 2015 | Sep. 30, 2014 | Feb. 28, 2011
Collaborative Arrangements and Non-collaborative Arrangement Transactions [Line Items] |  |  |  |  |  |  |  |  |  |
Ownership percentage |  |  |  | 20.00% |  |  | 20.00% | 20.00% |  |
Government contracts |  |  |  | $ 33,344 | $ 26,213 | $ 17,708 |  | $ 112,000 |  |
Research and development collaborations |  |  |  | $ 2,906 | $ 4,446 | $ 3,207 |  |  |  |
Cadila [Member] |  |  |  |  |  |  |  |  |  |
Collaborative Arrangements and Non-collaborative Arrangement Transactions [Line Items] |  |  |  |  |  |  |  |  |  |
Joint Venture Percentage Owned By Others |  |  |  | 80.00% |  |  | 80.00% | 80.00% |  |
HHS BARDA Contract [Member] |  |  |  |  |  |  |  |  |  |
Collaborative Arrangements and Non-collaborative Arrangement Transactions [Line Items] |  |  |  |  |  |  |  |  |  |
Government contracts |  |  | $ 3,100 |  |  |  |  |  |  |
Government Contract Receivable |  |  |  |  |  |  |  |  | $ 97,000 |
Increase in funding for recovery of additional costs under contract |  | $ 7,700 |  |  |  |  |  |  |  |
HHS BARDA Option for Additional Period [Member] |  |  |  |  |  |  |  |  |  |
Collaborative Arrangements and Non-collaborative Arrangement Transactions [Line Items] |  |  |  |  |  |  |  |  |  |
Contract term |  |  |  | 2 years |  |  |  |  |  |
Government Contract Receivable |  |  |  |  |  |  |  |  | $ 70,000 |
License Agreement with LG Life Sciences, Ltd. [Member] |  |  |  |  |  |  |  |  |  |
Collaborative Arrangements and Non-collaborative Arrangement Transactions [Line Items] |  |  |  |  |  |  |  |  |  |
Upfront license payment |  |  |  |  |  |  |  |  |  | $ 2,500
PATH Vaccine Solutions [Member] |  |  |  |  |  |  |  |  |  |
Collaborative Arrangements and Non-collaborative Arrangement Transactions [Line Items] |  |  |  |  |  |  |  |  |  |
Research and development collaborations |  |  |  | $ 500 |  |  | $ 6,800 |  |  |
Bill Melinda Gates Foundation [Member] |  |  |  |  |  |  |  |  |  |
Collaborative Arrangements and Non-collaborative Arrangement Transactions [Line Items] |  |  |  |  |  |  |  |  |  |
Grant agreement | $ 89,100 |  |  | $ 1,600 |  |  |  |  |  |

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