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Prepaid Expenses and Other Current Assets (Details) (USD $)
In Thousands, unless otherwise specified
Sep. 30, 2014
Dec. 31, 2013
Prepaid expenses and other current assets [Abstract]    
Kits for clinical use $ 227 $ 287
Insurance premiums 184 407
Professional fees 160 377
Other 181 [1] 640 [1]
Total prepaid expenses and other current assets $ 752 $ 1,711
Maximum percentage of prepaid expenses and other current assets (in hundredths) 5.00% 5.00%
[1] Other consists of various prepaid expenses and other current assets with no individual item accounting for more than 5% of the total balance at September 30, 2014 and December 31, 2013.