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Summary of Significant Accounting Policies (Details)
$ / shares in Units, $ in Thousands
12 Months Ended
Jul. 16, 2014
$ / shares
Dec. 31, 2015
USD ($)
segment
instrument
$ / shares
item
Dec. 31, 2014
USD ($)
$ / shares
Jun. 04, 2015
$ / shares
Reverse stock split        
Reverse stock split conversion ratio 0.1      
Common stock, par value | $ / shares $ 0.001 $ 0.001 $ 0.001 $ 0.001
Segment and Geographic Information        
Number of operating segments | segment   1    
Concentrations of Credit Risk and Off-Balance Sheet Risk        
Financial instruments held | instrument   0    
Cash and Cash Equivalents        
Number of banks in which Company holds cash and cash equivalents in depository accounts | item   6    
Fair Value of Financial Instruments        
Asset transfers between Levels   $ 0 $ 0  
Property and Equipment        
Impairment losses   0    
In-Process R&D        
Impairment charge of IPR&D   1,671 0  
Intangible Assets        
Impairment of intangible assets   0 $ 0  
Net Current Deferred Tax Asset        
Income Taxes        
Reclassification adjustment   109    
Net Current Deferred Tax Liability        
Income Taxes        
Reclassification adjustment   $ (80)    
Minimum        
Intangible Assets        
Intangible asset, useful life   6 years    
Maximum        
Intangible Assets        
Intangible asset, useful life   16 years 6 months    
Furniture And Fixtures        
Property and Equipment        
Estimated useful life   5 years    
Office and computer equipment        
Property and Equipment        
Estimated useful life   3 years