Annual report pursuant to Section 13 and 15(d)

Summary of Significant Accounting Policies - Property Plant and Equipment Useful Life (Details)

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Summary of Significant Accounting Policies - Property Plant and Equipment Useful Life (Details)
12 Months Ended
Dec. 31, 2018
Leasehold improvements  
Property, Plant and Equipment [Line Items]  
Estimated useful life 15 years
Computer systems and software | Minimum  
Property, Plant and Equipment [Line Items]  
Estimated useful life 3 years
Computer systems and software | Maximum  
Property, Plant and Equipment [Line Items]  
Estimated useful life 5 years
Furniture and fixtures | Minimum  
Property, Plant and Equipment [Line Items]  
Estimated useful life 5 years
Furniture and fixtures | Maximum  
Property, Plant and Equipment [Line Items]  
Estimated useful life 7 years