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Revenues - Additional Information (Details) - USD ($)
$ in Thousands
3 Months Ended 9 Months Ended 12 Months Ended
Mar. 31, 2022
Mar. 31, 2021
Sep. 30, 2021
Dec. 31, 2021
Disaggregation Of Revenue [Line Items]        
Subscription contracts term 1 year      
Revenues $ 5,161 $ 6,308    
Deferred costs expected period of benefit 30 months      
Unsatisfied performance obligation on subscription contract term 1 year      
Impairment losses related to costs capitalized $ 0 0    
Google [Member]        
Disaggregation Of Revenue [Line Items]        
Strategic agreement term, optional renewal term     1 year  
Revenues 1,788 $ 2,283    
Accounts receivable $ 1,788     $ 1,788
Google [Member] | Accounts Receivable [Member] | Customer Concentration Risk [Member]        
Disaggregation Of Revenue [Line Items]        
Percentage of concentration risk 41.00%     39.00%
Maximum [Member]        
Disaggregation Of Revenue [Line Items]        
Subscription contracts term 2 years      
Advance advertiser invoicing period 12 months      
Minimum [Member]        
Disaggregation Of Revenue [Line Items]        
Advance advertiser invoicing period 3 months      
Subscription remaining performance obligations expected duration 1 year