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Other Financial Information (Prepaid Expenses) (Details) (USD $) In Thousands, unless otherwise specified	Dec. 31, 2012	Dec. 31, 2011
Other Financial Information [Abstract]
Laboratory supplies	$ 1,592	$ 1,616
Other prepaid expenses	967	825
Prepaid expenses	$ 2,559	$ 2,441

Sum of the amounts paid in advance for capitalized costs that will be expensed with the passage of time or the occurrence of a triggering event, and will be charged against earnings within one year or the normal operating cycle, if longer.

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