| **Accounts Payable and Accrued Expenses**    | 9 Months Ended                                                                                                                                                                                                                                                                                                                                                                                                                                                                                            |
|----------------------------------------------|-----------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------|
||
| **Notes to Financial Statements [Abstract]** |                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                      |
| Accounts Payable and Accrued Expenses        | 6.  Accounts Payable and Accrued Expenses   September 30,2011  December 31,2010 Accrued consulting and clinical trial costs $2,056  $6,125 Accrued payroll and related costs  3,596   1,725 Legal and professional fees  530   1,116 Accounts payable  523   658 Other  176   59 Total $6,881  $9,683  |

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| X                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                            |
|----------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------|
| - Definition
Description and amounts of accounts payable and accrued disclosure at the end of the reporting period. This element may be used for the entire disclosure as a single block of text.
+ References
Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 02 -Paragraph 19 -Subparagraph a -Article 5Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 02 -Paragraph 20, 24 -Article 5
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