Quarterly report pursuant to Section 13 or 15(d)

SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES - Narrative (Details)

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SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES - Narrative (Details) - USD ($)
 3 Months Ended
Mar. 31, 2022
Mar. 31, 2021
Dec. 31, 2021
Apr. 30, 2020
Summary of Significant Accounting Policies [Line Items]        
Goodwill impairment $ 0 $ 0    
Intangible asset impairment $ 0 $ 0    
Payment term 60 days      
Ad serving services 85.10% 93.80%    
Measurement serving services 10.30% 1.10%    
Creative serving services 4.30% 4.70%    
Technology        
Summary of Significant Accounting Policies [Line Items]        
Intangible asset useful life 6 years      
Trade name        
Summary of Significant Accounting Policies [Line Items]        
Intangible asset useful life 8 years      
Customer relationships        
Summary of Significant Accounting Policies [Line Items]        
Intangible asset useful life 10 years      
Level 1 | Public        
Summary of Significant Accounting Policies [Line Items]        
Exercise price per share (in dollars per share) $ 1.01   $ 1.11  
Fair value $ 3,194,000   $ 3,510,000  
Level 3 | Private Placement        
Summary of Significant Accounting Policies [Line Items]        
Fair value $ 12,991,000   $ 15,462,000  
Software development costs        
Summary of Significant Accounting Policies [Line Items]        
Useful lives (in years) three years      
Capitalization cost $ 1,671,000 $ 0    
Paycheck Protection Program        
Summary of Significant Accounting Policies [Line Items]        
Unsecured debt       $ 3,516,000