Stock-Based Compensation - Summary of Stock-based Compensation (Details) - USD ($)	12 Months Ended
Dec. 31, 2020	Dec. 31, 2019
Cost of revenue	$ 103,063,445	$ 47,301,175
Selling and marketing	43,589,239	12,789,056
General and administrative	36,007,238	29,511,204
Total stock-based compensation	14,641,181	10,364,787
Stock-based Compensation [Member]
Cost of revenue	4,339,916	993,752
Selling and marketing	4,328,225	832,460
General and administrative	5,973,040	8,538,575
Total costs charged to operations	14,641,181	10,364,787
Capitalized platform development	1,608,995	1,307,390
Total stock-based compensation	16,250,176	11,672,177
Stock-based Compensation [Member] \| Publisher Partner Warrant [Member]
Cost of revenue	36,673	50,828
Selling and marketing
General and administrative
Total costs charged to operations	36,673	50,828
Capitalized platform development
Total stock-based compensation	36,673	50,828
Stock-based Compensation [Member] \| ABG Warrants [Member]
Cost of revenue
Selling and marketing
General and administrative	1,449,074	795,803
Total costs charged to operations	1,449,074	795,803
Capitalized platform development
Total stock-based compensation	1,449,074	795,803
Restricted Stock Awards [Member] \| Stock-based Compensation [Member]
Cost of revenue	163,181	122,192
Selling and marketing	1,486,722	34,393
General and administrative	317,982	2,541,468
Total costs charged to operations	1,967,885	2,698,053
Capitalized platform development	361,519	535,004
Total stock-based compensation	2,329,404	3,233,057
Common Stock Awards [Member] \| Stock-based Compensation [Member]
Cost of revenue	156,043	44,520
Selling and marketing	114,640	100,388
General and administrative	615,604	1,660,607
Total costs charged to operations	886,287	1,805,515
Capitalized platform development	178,284	175,837
Total stock-based compensation	1,064,571	1,981,352
Common Equity Awards [Member] \| Stock-based Compensation [Member]
Cost of revenue	3,975,625	774,632
Selling and marketing	2,454,432	455,280
General and administrative	3,439,803	3,383,338
Total costs charged to operations	9,869,860	4,613,250
Capitalized platform development	1,062,792	590,618
Total stock-based compensation	10,932,652	5,203,868
Outside Options [Member] \| Stock-based Compensation [Member]
Cost of revenue	8,394	1,580
Selling and marketing	272,431	242,399
General and administrative	150,577	157,359
Total costs charged to operations	431,402	401,338
Capitalized platform development	6,400	5,931
Total stock-based compensation	$ 437,802	$ 407,269

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