Summary of Stock-based Compensation (Details) - USD ($)	3 Months Ended		9 Months Ended
	Sep. 30, 2021	Sep. 30, 2020	Sep. 30, 2021	Sep. 30, 2020
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Cost of revenue	$ 32,173,859	$ 24,708,941	$ 83,978,050	$ 76,321,953
Selling and marketing	22,712,193	9,928,901	55,122,357	27,698,182
General and administrative	23,023,883	7,172,175	44,230,360	24,852,891
Total stock-based compensation			21,688,226	11,185,953
Stock-based Compensation [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Cost of revenue	1,732,139	1,270,498	4,929,708	3,563,691
Selling and marketing	1,421,111	1,144,150	4,059,266	3,280,134
General and administrative	5,319,582	1,427,730	12,699,252	4,342,128
Total costs charged to operations	8,472,832	3,842,378	21,688,226	11,185,953
Capitalized platform development	488,872	389,500	1,347,624	1,259,163
Total stock-based compensation	8,961,704	4,231,878	23,035,850	12,445,116
Stock-based Compensation [Member] | Publisher Partner Warrants [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Cost of revenue		992		36,654
Selling and marketing
General and administrative
Total costs charged to operations		992		36,654
Capitalized platform development
Total stock-based compensation		992		36,654
Stock-based Compensation [Member] | ABG Warrants [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Cost of revenue
Selling and marketing
General and administrative	745,636	364,248	1,498,217	1,084,826
Total costs charged to operations	745,636	364,248	1,498,217	1,084,826
Capitalized platform development
Total stock-based compensation	745,636	364,248	1,498,217	1,084,826
Restricted Stock [Member] | Stock-based Compensation [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Cost of revenue	11,808	35,610	60,838	108,936
Selling and marketing		323,164		920,566
General and administrative	414,163	80,306	559,505	238,558
Total costs charged to operations	425,971	439,080	620,343	1,268,060
Capitalized platform development	2,328	88,619	11,276	234,611
Total stock-based compensation	428,299	527,699	631,619	1,502,671
Common Stock Awards [Member] | Stock-based Compensation [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Cost of revenue	23,217	53,149	169,482	150,915
Selling and marketing	3,970	42,695	13,899	102,206
General and administrative	78,017	127,786	297,283	437,614
Total costs charged to operations	105,204	223,630	480,664	690,735
Capitalized platform development		32,680	5,071	154,445
Total stock-based compensation	105,204	256,310	485,735	845,180
Common Equity Awards [Member] | Stock-based Compensation [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Cost of revenue	1,696,147	1,178,276	4,694,925	3,261,542
Selling and marketing	1,341,948	734,391	3,820,996	2,114,595
General and administrative	4,081,766	855,390	10,344,247	2,430,553
Total costs charged to operations	7,119,861	2,768,057	18,860,168	7,806,690
Capitalized platform development	483,854	267,013	1,324,805	864,656
Total stock-based compensation	7,603,715	3,035,070	20,184,973	8,671,346
Outside Options [Member] | Stock-based Compensation [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Cost of revenue	967	2,471	4,463	5,644
Selling and marketing	75,193	43,900	224,371	142,767
General and administrative				150,577
Total costs charged to operations	76,160	46,371	228,834	298,988
Capitalized platform development	2,690	1,188	6,472	5,451
Total stock-based compensation	$ 78,850	$ 47,559	$ 235,306	$ 304,439