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Revenues - Additional Information (Details) - USD ($)
$ in Thousands
3 Months Ended 6 Months Ended 9 Months Ended 12 Months Ended
Jun. 30, 2022
Jun. 30, 2021
Jun. 30, 2022
Jun. 30, 2021
Sep. 30, 2021
Dec. 31, 2021
Disaggregation Of Revenue [Line Items]            
Subscription contracts term     1 year      
Revenues $ 4,720 $ 6,094 $ 9,881 $ 12,402    
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 $ 0 0    
Google [Member]            
Disaggregation Of Revenue [Line Items]            
Strategic agreement term, optional renewal term         1 year  
Revenues 1,788 $ 2,283 3,575 $ 4,566    
Accounts receivable $ 1,788   $ 1,788     $ 1,787
Google [Member] | Accounts Receivable [Member] | Customer Concentration Risk [Member]            
Disaggregation Of Revenue [Line Items]            
Percentage of concentration risk     45.00%     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