| **Accounts Payable and Accrued Expenses (Tables)**   | 12 Months Ended                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                       |
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| **Accounts Payable and Accrued Expenses [Abstract]** |                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                  |
| Schedule of accounts payable and accrued expenses    | The carrying value of our accounts payable and accrued expenses approximates fair value, as it represents amounts due to vendors and employees, which will be satisfied within one year. Accounts payable and accrued expenses as of December 31, 2012 and 2011, consisted of the following:  2012  2011 Accrued consulting and clinical trial costs $2,193  $1,637 Accrued payroll and related costs  1,552   3,149 Restructuring accrual  813   731 Legal and professional fees  774   371 Accounts payable  229   309 Other  79   134 Total $5,640  $6,331  |

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| - Definition
Tabular disclosure of the (a) carrying value as of the balance sheet date of liabilities incurred (and for which invoices have typically been received) and payable to vendors for goods and services received that are used in an entity's business (accounts payable); (b) other payables; and (c) accrued liabilities. Examples include taxes, interest, rent and utilities. Used to reflect the current portion of the liabilities (due within one year or within the normal operating cycle if longer). An alternative caption includes accrued expenses.
+ References
No definition available.
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