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Current Accrued Expenses (Details) (USD $)
In Thousands, unless otherwise specified
Dec. 31, 2013
Dec. 31, 2012
Current Accrued Expenses [Abstract]    
Compensation, excluding taxes $ 1,866 $ 1,933
Deferred rent 485 443
Professional fees 360 1,438
Contract Research Organization 0 1,283
Other 1,029 [1] 693 [1]
Total accrued liabilities $ 3,740 $ 5,790
Maximum percentage of current liabilities accrued (in hundredths) 5.00% 5.00%
[1] Other consists of various accrued expenses, with no individual item accounting for more than 5% of current liabilities at December 31, 2013 and 2012.