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Acquisitions (Details Textual) - USD ($)
$ in Thousands
3 Months Ended 12 Months Ended
Nov. 30, 2018
Aug. 07, 2018
May 01, 2018
Jan. 02, 2018
Sep. 30, 2019
Dec. 31, 2020
Dec. 31, 2019
Dec. 31, 2018
Business Acquisition [Line Items]                
Acquired finite-lived intangible assets, weighted average useful life           5 years 2 months 12 days    
Goodwill           $ 120,589 $ 171,563 $ 176,124
TTi Global [Member] [Member]                
Business Acquisition [Line Items]                
Cash purchase price $ 14,195              
Working capital adjustment         $ 900      
Fair value of contingent consideration 0              
Goodwill 4,655              
Working capital adjustment (850)              
Business Combination, Consideration Transferred 13,345              
Cash 1,780              
Accounts receivable and other assets 14,218              
Fixed assets 300              
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Assets 25,835              
Accrued expenses 10,066              
Deferred revenue 219              
Deferred tax liability 2,205              
Total liabilities 12,490              
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Net $ 13,345              
TTi Global [Member] [Member] | Customer-Related Intangible Assets [Member]                
Business Acquisition [Line Items]                
Acquired finite-lived intangible assets, weighted average useful life 9 years              
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Intangible Assets, Other than Goodwill $ 4,428              
TTi Global [Member] [Member] | Marketing-Related Intangible Assets [Member]                
Business Acquisition [Line Items]                
Acquired finite-lived intangible assets, weighted average useful life 1 year              
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Intangible Assets, Other than Goodwill $ 454              
TTi (Europe) Limited [Member] [Member]                
Business Acquisition [Line Items]                
Cash purchase price   $ 3,000            
Fair value of contingent consideration   0            
Goodwill   2,179            
Working capital adjustment   0            
Business Combination, Consideration Transferred   3,000            
Cash   125            
Accounts receivable and other assets   1,684            
Fixed assets   9            
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Assets   4,804            
Accrued expenses   1,609            
Deferred revenue   126            
Deferred tax liability   69            
Total liabilities   1,804            
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Net   $ 3,000            
TTi (Europe) Limited [Member] [Member] | Customer-Related Intangible Assets [Member]                
Business Acquisition [Line Items]                
Acquired finite-lived intangible assets, weighted average useful life   9 years            
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Intangible Assets, Other than Goodwill   $ 762            
TTi (Europe) Limited [Member] [Member] | Marketing-Related Intangible Assets [Member]                
Business Acquisition [Line Items]                
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Intangible Assets, Other than Goodwill   $ 45            
IC Axon [Member]                
Business Acquisition [Line Items]                
Cash purchase price     $ 30,535          
Fair value of contingent consideration     905          
Goodwill     21,613          
Working capital adjustment     0          
Business Combination, Consideration Transferred     31,440          
Cash     538          
Accounts receivable and other assets     3,110          
Fixed assets     368          
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Assets     36,233          
Accrued expenses     983          
Deferred revenue     979          
Deferred tax liability     2,831          
Total liabilities     4,793          
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Net     31,440          
Business Combination, Contingent Consideration Arrangements, Range of Outcomes, Value, High     $ 3,500          
IC Axon [Member] | Customer-Related Intangible Assets [Member]                
Business Acquisition [Line Items]                
Acquired finite-lived intangible assets, weighted average useful life     8 years          
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Intangible Assets, Other than Goodwill     $ 10,365          
IC Axon [Member] | Marketing-Related Intangible Assets [Member]                
Business Acquisition [Line Items]                
Acquired finite-lived intangible assets, weighted average useful life     3 years          
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Intangible Assets, Other than Goodwill     $ 239          
Hula Partners [Member] [Member]                
Business Acquisition [Line Items]                
Cash purchase price       $ 10,000        
Fair value of contingent consideration       0        
Goodwill       8,527        
Working capital adjustment       0        
Business Combination, Consideration Transferred       10,000        
Cash       0        
Accounts receivable and other assets       0        
Fixed assets       0        
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Assets       10,000        
Accrued expenses       0        
Deferred revenue       0        
Deferred tax liability       0        
Total liabilities       0        
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Net       $ 10,000        
Hula Partners [Member] [Member] | Customer-Related Intangible Assets [Member]                
Business Acquisition [Line Items]                
Acquired finite-lived intangible assets, weighted average useful life       4 years        
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Intangible Assets, Other than Goodwill       $ 1,367        
Hula Partners [Member] [Member] | Marketing-Related Intangible Assets [Member]                
Business Acquisition [Line Items]                
Acquired finite-lived intangible assets, weighted average useful life       2 years        
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Intangible Assets, Other than Goodwill       $ 106