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Summary of Business and Significant Accounting Policies (Tables)
12 Months Ended
Dec. 31, 2017
Accounting Policies [Abstract]  
Property, Plant and Equipment
Depreciation and amortization is computed using the straight-line method based on estimated useful lives as follows:

Computer equipment and software
 
3 to 5 years
Office equipment and furniture
 
5 years
Leasehold improvements
 
Lesser of useful life (typically 5 to 10 years) or related lease term