Revenues - Schedule of Disaggregation of Revenue (Details) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2022	Sep. 30, 2021	Sep. 30, 2022	Sep. 30, 2021
Disaggregation Of Revenue [Line Items]
Total revenues	$ 29,071	$ 21,774	$ 82,316	$ 58,450
Subscription
Disaggregation Of Revenue [Line Items]
Total revenues	26,075	20,139	73,186	53,098
Advisory
Disaggregation Of Revenue [Line Items]
Total revenues	518	452	3,307	1,052
Advertising
Disaggregation Of Revenue [Line Items]
Total revenues	695	744	2,073	1,898
Books
Disaggregation Of Revenue [Line Items]
Total revenues	40	118	710	1,094
Other Revenue
Disaggregation Of Revenue [Line Items]
Total revenues	$ 1,743	$ 321	$ 3,040	$ 1,308