Organization and Business - Customer Concentration (Details) - Customer Concentration Risk - Net Revenue	3 Months Ended
	Mar. 31, 2021	Mar. 31, 2020
Yahoo, Proper Media and Google
Concentration Risk [Line Items]
Percentage of concentration risk	75.70%	69.80%
Google
Concentration Risk [Line Items]
Percentage of concentration risk	40.00%	18.40%
Proper Media
Concentration Risk [Line Items]
Percentage of concentration risk	19.20%	0.00%
Yahoo!
Concentration Risk [Line Items]
Percentage of concentration risk	16.50%	51.40%