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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
Aug. 31, 2017
Apr. 01, 2017
Feb. 01, 2017
Sep. 30, 2019
Dec. 31, 2017
Dec. 31, 2019
Dec. 31, 2018
Business Acquisition [Line Items]                      
Acquired finite-lived intangible assets, weighted average useful life                   5 years 8 months  
Goodwill                 $ 144,835 $ 171,563 $ 176,124
Accounts payable and accrued liability                     600
Business acquisition contingent consideration, other long term liability                     $ 100
Emantras [Member]                      
Business Acquisition [Line Items]                      
Cash purchase price           $ 3,191          
Fair value of contingent consideration           220          
Business Combination, Recognized Identifiable Assets Acquired, Goodwill, and Liabilities Assumed, Net           800          
Goodwill           3,156          
Working capital adjustment           0          
Business Combination, Consideration Transferred           3,411          
Cash           0          
Accounts receivable and other assets           0          
Fixed assets           50          
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Assets           4,024          
Accrued expenses           558          
Deferred revenue           55          
Deferred tax liability           0          
Total liabilities           613          
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Net           3,411          
Business Combination, Contingent Consideration Arrangements, Range of Outcomes, Value, High           300          
Emantras [Member] | Technology-Based Intangible Assets [Member]                      
Business Acquisition [Line Items]                      
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Intangible Assets, Other than Goodwill           $ 0          
Emantras [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           $ 818          
Emantras [Member] | Marketing-Related Intangible Assets [Member]                      
Business Acquisition [Line Items]                      
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Intangible Assets, Other than Goodwill           $ 0          
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              
YouTrain [Member]                      
Business Acquisition [Line Items]                      
Cash purchase price         $ 4,898            
Consideration transferred, completion accounts payment                 $ 200    
Fair value of contingent consideration         0            
Goodwill         3,268            
Working capital adjustment         180            
Business Combination, Consideration Transferred         5,078            
Cash         673            
Accounts receivable and other assets         234            
Fixed assets         215            
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Assets         5,703            
Accrued expenses         348            
Deferred revenue         28            
Deferred tax liability         249            
Total liabilities         625            
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Net         5,078            
YouTrain [Member] | Technology-Based Intangible Assets [Member]                      
Business Acquisition [Line Items]                      
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Intangible Assets, Other than Goodwill         $ 0            
YouTrain [Member] | Customer-Related Intangible Assets [Member]                      
Business Acquisition [Line Items]                      
Acquired finite-lived intangible assets, weighted average useful life         5 years            
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Intangible Assets, Other than Goodwill         $ 1,313            
YouTrain [Member] | Marketing-Related Intangible Assets [Member]                      
Business Acquisition [Line Items]                      
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Intangible Assets, Other than Goodwill         0            
CLS [Member] [Member]                      
Business Acquisition [Line Items]                      
Cash purchase price         436            
Fair value of contingent consideration         888            
Goodwill         1,090            
Working capital adjustment         0            
Business Combination, Consideration Transferred         1,324            
Cash         0            
Accounts receivable and other assets         0            
Fixed assets         0            
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Assets         1,343            
Accrued expenses         19            
Deferred revenue         0            
Deferred tax liability         0            
Total liabilities         19            
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Net         1,324            
Business Combination, Contingent Consideration Arrangements, Range of Outcomes, Value, High         2,200            
CLS [Member] [Member] | Technology-Based Intangible Assets [Member]                      
Business Acquisition [Line Items]                      
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Intangible Assets, Other than Goodwill         $ 0            
CLS [Member] [Member] | Customer-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         $ 253            
CLS [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         $ 0            
McKinney Rogers [Member]                      
Business Acquisition [Line Items]                      
Cash purchase price             $ 3,259        
Fair value of contingent consideration             4,505        
Business Combination, Recognized Identifiable Assets Acquired, Goodwill, and Liabilities Assumed, Net             1,600        
Goodwill             5,196        
Working capital adjustment             0        
Business Combination, Consideration Transferred             7,764        
Cash             0        
Accounts receivable and other assets             0        
Fixed assets             0        
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Assets             8,674        
Accrued expenses             44        
Deferred revenue             866        
Deferred tax liability             0        
Total liabilities             910        
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Net             7,764        
Business Combination, Contingent Consideration Arrangements, Range of Outcomes, Value, High             18,000        
McKinney Rogers [Member] | Technology-Based Intangible Assets [Member]                      
Business Acquisition [Line Items]                      
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Intangible Assets, Other than Goodwill             $ 2,704        
McKinney Rogers [Member] | Customer-Related Intangible Assets [Member]                      
Business Acquisition [Line Items]                      
Acquired finite-lived intangible assets, weighted average useful life             5 years        
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Intangible Assets, Other than Goodwill             $ 653        
McKinney Rogers [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             $ 121