| **Unaudited Quarterly Results (unaudited) (Details) (USD $)In Thousands, except Per Share data, unless otherwise specified** | 3 Months Ended | 12 Months Ended |
|------------------------------------------------------------------------------------------------------------------------------|----------------|-----------------|
||
| **Segment Reporting Information [Line Items]**                                                                               |           |            |   |   |   |   |   |   |   |   |   |
| Revenues                                                                                                                     | $ 8,885        | $ 1,117         | $ 1,820 | $ 2,226 | $ 2,197 | $ 5,804 | $ 74,407 | $ 2,388 | $ 14,048 | $ 84,796 | $ 7,952 |
| Net income (loss)                                                                                                            | (324)          | (11,301)        | (10,720) | (13,086) | (10,746) | (11,432) | 55,486 | (22,927) | (35,431) | 10,381 | (69,725) |
| Net (loss) income per share - basic                                                                                          |           |            |   |   | $ (0.32) | $ (0.34) | $ 1.66 | $ (0.69) | $ (1.02) | $ 0.31 | $ (2.14) |
| Net (loss) income per share - diluted                                                                                        |           |            |   |   | $ (0.32) | $ (0.34) | $ 1.64 | $ (0.69) | $ (1.02) | $ 0.31 | $ (2.14) |
| Net income (loss) per share - basic and diluted (in dollars per share)                                                       | $ (0.01)       | $ (0.33)        | $ (0.32) | $ (0.39) |   |   |   |   | $ (1.02) |   | $ (2.14) |
| MedImmune [Member]                                                                                                           |           |            |   |   |   |   |   |   |   |   |   |
| **Segment Reporting Information [Line Items]**                                                                               |           |            |   |   |   |   |   |   |   |   |   |
| Revenues                                                                                                                     | 5,000          |            |   |   |   |   |   |   |   |   |   |
| CytoDyn [Member]                                                                                                             |           |            |   |   |   |   |   |   |   |   |   |
| **Segment Reporting Information [Line Items]**                                                                               |           |            |   |   |   |   |   |   |   |   |   |
| Revenues                                                                                                                     | 2,800          |            |   |   |   |   |   |   |   |   |   |
| Salix [Member]                                                                                                               |           |            |   |   |   |   |   |   |   |   |   |
| **Segment Reporting Information [Line Items]**                                                                               |           |            |   |   |   |   |   |   |   |   |   |
| Revenues                                                                                                                     |           |            |   |   |   |   | $ 59,500 |   |   |   |   |

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|-----------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------|
| - Definition
The amount of net income (loss) for the period per each share of common stock or unit outstanding during the reporting period.
+ References
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|-----------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------|
| - Definition
The amount of net income or loss for the period per each share in instances when basic and diluted earnings per share are the same amount and reported as a single line item on the face of the financial statements.  Basic earnings per share is the amount of net income or loss for the period per each share of common stock or unit outstanding during the reporting period.  Diluted earnings per share includes the amount of net income or loss for the period available to each share of common stock or common unit outstanding during the reporting period and to each share or unit that would have been outstanding assuming the issuance of common shares or units for all dilutive potential common shares or units outstanding during the reporting period.
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|----------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------|
| - Definition
The amount of net income (loss) for the period available to each share of common stock or common unit outstanding during the reporting period and to each share or unit that would have been outstanding assuming the issuance of common shares or units for all dilutive potential common shares or units outstanding during the reporting period.
+ References
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| - Definition
The portion of profit or loss for the period, net of income taxes, which is attributable to the parent.
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| - Definition
Aggregate revenue recognized during the period (derived from goods sold, services rendered, insurance premiums, or other activities that constitute an entity's earning process). For financial services companies, also includes investment and interest income, and sales and trading gains.
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