Revenues - Additional Information (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2021	Dec. 31, 2020
Disaggregation Of Revenue [Line Items]
Subscription contracts term	1 year
Unsatisfied performance obligation on subscription contract term	1 year
Revenues	$ 24,420	$ 29,983
Remaining performance obligation	3,703
Deferred strategic agreement revenues	$ 0	1,657
Deferred costs expected period of benefit	30 months
Impairment losses related to costs capitalized	$ 0	0
Google [Member]
Disaggregation Of Revenue [Line Items]
Strategic agreement term	3 years
Revenues	$ 8,637	9,149
Accounts receivable		$ 1,725
New Google [Member]
Disaggregation Of Revenue [Line Items]
Revenues	1,788
Accounts receivable	$ 1,787
Maximum [Member]
Disaggregation Of Revenue [Line Items]
Subscription contracts term	2 years
Advance advertiser invoicing period	12 months
Maximum [Member] | Google [Member]
Disaggregation Of Revenue [Line Items]
Strategic agreement term	2 years
Minimum [Member]
Disaggregation Of Revenue [Line Items]
Advance advertiser invoicing period	3 months
Subscription remaining performance obligations expected duration	1 year