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Business Acquisitions (Narrative) (Details) - USD ($)
3 Months Ended
Aug. 06, 2018
Sep. 30, 2018
Dec. 31, 2019
Dec. 31, 2018
Dec. 31, 2017
Business Acquisition [Line Items]          
Goodwill recorded on acquisition     $ 80,721,000 $ 80,721,000 $ 64,314,000
Meural          
Business Acquisition [Line Items]          
Total purchase price $ 22,200,000        
Purchase price, cash paid   $ 14,400,000      
Prior equity interest settlement 1,500,000        
Fair value of contingent considerations 6,300,000        
Contingent consideration liability 5,900,000        
Goodwill recorded on acquisition 16,407,000        
Non-current deferred tax 815,000        
Goodwill deductible for income tax purposes 0        
Intangibles 4,800,000        
Meural | Technology          
Business Acquisition [Line Items]          
Intangibles $ 3,000,000.0        
Acquired intangible assets, estimated useful life ( in years) 7 years        
Meural | Trade Names          
Business Acquisition [Line Items]          
Intangibles $ 600,000        
Acquired intangible assets, estimated useful life ( in years) 3 years        
Meural | Customer Relationships          
Business Acquisition [Line Items]          
Intangibles $ 600,000        
Acquired intangible assets, estimated useful life ( in years) 2 years        
Meural | Database          
Business Acquisition [Line Items]          
Intangibles $ 600,000        
Acquired intangible assets, estimated useful life ( in years) 7 years        
Meural | Measurement Input, Discount Rate | Minimum          
Business Acquisition [Line Items]          
Intangible Asset, Measurement Input 16.00%        
Meural | Measurement Input, Discount Rate | Maximum          
Business Acquisition [Line Items]          
Intangible Asset, Measurement Input 19.00%        
Meural | Measurement Input, Discount Rate | Technology          
Business Acquisition [Line Items]          
Intangible Asset, Measurement Input 16.00%        
Meural | Technical Milestone          
Business Acquisition [Line Items]          
Contingent consideration liability, maximum amount of each milestone $ 3,500,000        
Meural | Service Revenue Milestone          
Business Acquisition [Line Items]          
Contingent consideration liability, maximum amount of each milestone $ 3,500,000