Annual report pursuant to Section 13 and 15(d)

SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES (Narrative) (Details)

v3.22.0.1
SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES (Narrative) (Details)
12 Months Ended
Dec. 31, 2021
USD ($)
reportingUnit
$ / shares
Dec. 31, 2020
USD ($)
Dec. 31, 2019
USD ($)
Jan. 01, 2022
USD ($)
Nov. 30, 2021
USD ($)
$ / shares
Apr. 30, 2020
USD ($)
Jan. 07, 2019
Dec. 31, 2018
USD ($)
Summary of Significant Accounting Policies [Line Items]                
Impairments of long-lived assets $ 0 $ 0 $ 0          
Number of reporting units | reportingUnit 1              
Goodwill impairment $ 0 0 0          
Expiration term of warrant (in years)         5 years      
Severance costs $ 755,000 $ 600,000 $ 579,000          
Payment term 60 days              
Ad serving services 93.60% 96.50% 96.90%          
Creative serving services 4.80% 2.80% 2.50%          
Exchange ratio 1.337       1.337   1.337  
Subsequent Event | Cumulative Effect, Period of Adoption, Adjustment                
Summary of Significant Accounting Policies [Line Items]                
Operating lease, liability       $ 5,500,000        
Operating lease, asset       $ 3,900,000        
Software development costs                
Summary of Significant Accounting Policies [Line Items]                
Useful lives (in years) 3 years              
Capitalization cost $ 2,594,000 $ 0 $ 0          
Employee Severance                
Summary of Significant Accounting Policies [Line Items]                
Number of employee deposit, percent 8.33%              
Postemployment Retirement Benefits                
Summary of Significant Accounting Policies [Line Items]                
Maximum annual contributions per employee, percent 4.00% 4.00%            
Defined contribution plan, cost $ 961,000 $ 705,000 569,000          
Public | Level 1                
Summary of Significant Accounting Policies [Line Items]                
Exercise price per share (in dollars per share) | $ / shares $ 1.11       $ 1.38      
Fair value $ 3,510,000       $ 4,364,000      
Private Placement | Level 3                
Summary of Significant Accounting Policies [Line Items]                
Fair value 15,462,000       $ 18,427,000      
Fair Value, Recurring | Warrants Liability | Level 3                
Summary of Significant Accounting Policies [Line Items]                
Fair value $ 15,462,000 $ 499,000 $ 413,000         $ 389,000
Fair Value, Recurring | Warrants Liability | Measurement Input, Risk Free Interest Rate                
Summary of Significant Accounting Policies [Line Items]                
Warrant measurement input   0.001 0.012          
Fair Value, Recurring | Warrants Liability | Measurement Input, Price Volatility                
Summary of Significant Accounting Policies [Line Items]                
Warrant measurement input   0.75 0.70          
Geographic Distribution, Foreign                
Summary of Significant Accounting Policies [Line Items]                
Weighted average interest rate 0.01% 0.01%            
Paycheck Protection Program                
Summary of Significant Accounting Policies [Line Items]                
Unsecured debt           $ 3,516,000    
Series A preferred stocks | Fair Value, Recurring | Warrants Liability                
Summary of Significant Accounting Policies [Line Items]                
Expiration term of warrant (in years)   1 year 7 months 6 days            
Series C preferred stocks | Fair Value, Recurring | Warrants Liability                
Summary of Significant Accounting Policies [Line Items]                
Expiration term of warrant (in years)   1 year 6 months 2 years 6 months