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Summary of Property and Equipment (Details) - USD ($)
$ in Thousands
6 Months Ended
Jun. 30, 2015
Dec. 31, 2014
Property Plant And Equipment [Line Items]    
Property and Equipment, Gross $ 425 $ 418
Accumulated depreciation and amortization (391) (382)
Property and equipment, net $ 34 36
Computer Equipment    
Property Plant And Equipment [Line Items]    
Estimated Life 3 years  
Property and Equipment, Gross $ 102 97
Lab Equipment    
Property Plant And Equipment [Line Items]    
Estimated Life 5 years  
Property and Equipment, Gross $ 142 142
Furniture and Fixtures    
Property Plant And Equipment [Line Items]    
Estimated Life 5 years  
Property and Equipment, Gross $ 90 89
Computer Software    
Property Plant And Equipment [Line Items]    
Estimated Life 3 years  
Property and Equipment, Gross $ 83 82
Leasehold Improvements    
Property Plant And Equipment [Line Items]    
Estimated Life Lesser of useful life or life of the lease  
Property and Equipment, Gross $ 8 $ 8