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Summary of Significant Accounting Policies - Property and Equipment (Details)
12 Months Ended
Dec. 31, 2013
Equipment [Member]
 
Significant Accounting Policies [Line Items]  
Property, plant and equipment, useful life (in years) 3 years
Furniture and Fixtures [Member] | Minimum [Member]
 
Significant Accounting Policies [Line Items]  
Property, plant and equipment, useful life (in years) 5 years
Furniture and Fixtures [Member] | Maximum [Member]
 
Significant Accounting Policies [Line Items]  
Property, plant and equipment, useful life (in years) 10 years
Leasehold Improvements [Member]
 
Significant Accounting Policies [Line Items]  
Property, plant and equipment, useful life (in years) 5 years