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Summary of Significant Accounting Policies (Details) (USD $)
12 Months Ended
Dec. 31, 2014
item
Dec. 31, 2008
Segment Information    
Number of operating segments 1us-gaap_NumberOfOperatingSegments  
Impairment of Long-Lived Assets    
Other impairment losses $ 0us-gaap_OtherAssetImpairmentCharges  
In-Process Research and Development    
Acquired in-process research and development   $ 100,000us-gaap_ResearchAndDevelopmentAssetAcquiredOtherThanThroughBusinessCombinationWrittenOff
Property and equipment | Minimum    
Property and equipment, net    
Estimated useful lives 3 years  
Property and equipment | Maximum    
Property and equipment, net    
Estimated useful lives 10 years