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Business Acquisitions (Narrative) (Details) - USD ($)
3 Months Ended
Aug. 06, 2018
Sep. 30, 2018
Dec. 31, 2020
Dec. 31, 2019
Business Acquisition [Line Items]        
Contingent consideration liability     $ 3,000,000.0 $ 5,900,000
Goodwill recorded on acquisition     $ 80,721,000 $ 80,721,000
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      
Meural | Trade Names | Minimum        
Business Acquisition [Line Items]        
Acquired intangible assets, estimated useful life ( in years) 2 years      
Meural | Trade Names | Maximum        
Business Acquisition [Line Items]        
Acquired intangible assets, estimated useful life ( in years) 7 years      
Meural | Customer Relationships        
Business Acquisition [Line Items]        
Intangibles $ 600,000      
Meural | Customer Relationships | Minimum        
Business Acquisition [Line Items]        
Acquired intangible assets, estimated useful life ( in years) 2 years      
Meural | Customer Relationships | Maximum        
Business Acquisition [Line Items]        
Acquired intangible assets, estimated useful life ( in years) 7 years      
Meural | Database        
Business Acquisition [Line Items]        
Intangibles $ 600,000      
Meural | Database | Minimum        
Business Acquisition [Line Items]        
Acquired intangible assets, estimated useful life ( in years) 2 years      
Meural | Database | Maximum        
Business Acquisition [Line Items]        
Acquired intangible assets, estimated useful life ( in years) 7 years      
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