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Organization and Significant Accounting Policies - Property and Equipment, net (Details) - USD ($)
$ in Millions
12 Months Ended
Dec. 31, 2019
Dec. 31, 2018
Dec. 31, 2017
Property, Plant and Equipment [Line Items]      
Depreciation $ 3.7 $ 3.4 $ 3.4
Minimum      
Property, Plant and Equipment [Line Items]      
Useful life 3 years    
Maximum      
Property, Plant and Equipment [Line Items]      
Useful life 10 years