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 6 Months Ended
Jun. 30, 2022
Jun. 30, 2021
Jun. 30, 2022
Jun. 30, 2021
Dec. 31, 2021
Apr. 30, 2020
Summary of Significant Accounting Policies [Line Items]            
Goodwill impairment $ 0 $ 0 $ 0 $ 0    
Intangible asset impairment $ 0 $ 0 $ 0 $ 0    
Payment term     60 days      
Ad serving and creative services 78.40% 98.50% 83.20% 98.50%    
Measurement serving services 21.60% 0.80% 16.60% 0.90%    
Level 1 | Public            
Summary of Significant Accounting Policies [Line Items]            
Exercise price per share (in dollars per share) $ 0.22   $ 0.22   $ 1.11  
Fair value $ 696,000   $ 696,000   $ 3,510,000  
Level 3 | Private Placement            
Summary of Significant Accounting Policies [Line Items]            
Fair value 2,330,000   $ 2,330,000   $ 15,462,000  
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      
Software development costs            
Summary of Significant Accounting Policies [Line Items]            
Useful lives (in years)     three years      
Capitalization cost $ 2,335,000 $ 0 $ 4,006,000 $ 0    
Paycheck Protection Program            
Summary of Significant Accounting Policies [Line Items]            
Unsecured debt           $ 3,516,000