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Accrued Expenses (Details) (USD $)
In Thousands, unless otherwise specified
 12 Months Ended
Dec. 31, 2013
Mar. 31, 2014
Accrued Expenses [Abstract]    
Compensation, excluding taxes $ 1,866 $ 1,853
Deferred rent 485 483
Professional fees 360 323
Other 1,029 [1] 817 [1]
Total accrued expenses $ 3,740 $ 3,476
Maximum percentage of current liabilities accrued (in hundredths) 5.00% 5.00%
Percentage of current annual salary as cash retention bonus (in hundredths) 50.00%  
[1] Other consists of various accrued expenses, with no individual item accounting for more than 5% of current liabilities at March 31, 2014 and December 31, 2013.