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Prepaid Expenses and Other Current Assets (Details) (USD $)
In Thousands, unless otherwise specified
Dec. 31, 2013
Dec. 31, 2012
Prepaid expenses and other current assets [Abstract]    
Insurance premiums $ 407 $ 232
Professional fees 377 531
Income tax credits receivable 326 305
Kits for clinical use 287 81
Other 314 [1] 308 [1]
Total prepaid and other current assets $ 1,711 $ 1,457
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% at December 31, 2013 and 2012.