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Summary of Significant Accounting Policies (Details 2) - USD ($)
$ in Thousands
Dec. 31, 2015
Dec. 31, 2014
Summary of Property and equipment    
Property and equipment , gross $ 3,153 $ 3,129
Less accumulated depreciation and amortization (2,781) (2,643)
Property and equipment, net 372 486
Lab and office equipment    
Summary of Property and equipment    
Property and equipment , gross 2,248 2,232
Leasehold improvements    
Summary of Property and equipment    
Property and equipment , gross 273 273
Computer equipment and software    
Summary of Property and equipment    
Property and equipment , gross $ 632 $ 624