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Property and Equipment - Summary of Property and Equipment (Details) - USD ($)
$ in Thousands
6 Months Ended
Jun. 30, 2016
Dec. 31, 2015
Property Plant And Equipment [Line Items]    
Property and Equipment, Gross $ 448 $ 415
Accumulated depreciation and amortization (372) (387)
Property and equipment, net $ 76 28
Computer Equipment    
Property Plant And Equipment [Line Items]    
Estimated Life 3 years  
Property and Equipment, Gross $ 81 90
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 $ 83 91
Computer Software    
Property Plant And Equipment [Line Items]    
Estimated Life 3 years  
Property and Equipment, Gross $ 84 84
Leasehold Improvements    
Property Plant And Equipment [Line Items]    
Estimated Life Lesser of useful life or life of the lease  
Property and Equipment, Gross $ 58 $ 8