Annual report pursuant to Section 13 and 15(d)

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

v3.8.0.1
Summary of Significant Accounting Policies - Property and Equipment (Details)
12 Months Ended
Dec. 31, 2017
Furniture and office equipment  
Property, Plant and Equipment [Line Items]  
Property and equipment estimated useful life 5 years
Computer equipment and software costs | Maximum  
Property, Plant and Equipment [Line Items]  
Property and equipment estimated useful life 5 years
Computer equipment and software costs | Minimum  
Property, Plant and Equipment [Line Items]  
Property and equipment estimated useful life 3 years
Leasehold improvements | Maximum  
Property, Plant and Equipment [Line Items]  
Property and equipment estimated useful life 5 years
Automobiles  
Property, Plant and Equipment [Line Items]  
Property and equipment estimated useful life 5 years