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Supplemental Balance Sheet Information (Details) (USD $) In Thousands, unless otherwise specified	Sep. 30, 2012	Dec. 31, 2011
Accrued expenses
Accrued compensation, benefits and withholdings	$ 2,312	$ 3,113
Clinical, manufacturing and scientific costs	1,229	819
Professional fees	399	619
Other	887	452
Total Accrued expenses	$ 4,827	$ 5,003

Carrying value as of the balance sheet date of obligations incurred through that date and payable arising from transactions not otherwise specified in the taxonomy. Used to reflect the current portion of the liabilities (due within one year or within the normal operating cycle if longer).

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