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Summary of Stock-based Compensation (Details) - USD ($) | 3 Months Ended | 9 Months Ended | 12 Months Ended
--- | --- | --- | ---
Sep. 30, 2021 | Sep. 30, 2020 | Sep. 30, 2021 | Sep. 30, 2020 | Dec. 31, 2020 | Dec. 31, 2019
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 | $ 103,063,445 | $ 47,301,175
Selling and marketing | 22,712,193 | 9,928,901 | 55,122,357 | 27,698,182 | 43,589,239 | 12,789,056
General and administrative | 23,023,883 | 7,172,175 | 44,230,360 | 24,852,891 | 36,007,238 | 29,511,204
Total stock-based compensation |  |  | 21,688,226 | 11,185,953 | 14,641,181 | 10,364,787
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 | 4,339,916 | 993,752
Selling and marketing | 1,421,111 | 1,144,150 | 4,059,266 | 3,280,134 | 4,328,225 | 832,460
General and administrative | 5,319,582 | 1,427,730 | 12,699,252 | 4,342,128 | 5,973,040 | 8,538,575
Total costs charged to operations | 8,472,832 | 3,842,378 | 21,688,226 | 11,185,953 | 14,641,181 | 10,364,787
Capitalized platform development | 488,872 | 389,500 | 1,347,624 | 1,259,163 | 1,608,995 | 1,307,390
Total stock-based compensation | 8,961,704 | 4,231,878 | 23,035,850 | 12,445,116 | 16,250,176 | 11,672,177
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 | 1,449,074 | 795,803
Total costs charged to operations | 745,636 | 364,248 | 1,498,217 | 1,084,826 | 1,449,074 | 795,803
Capitalized platform development |  |  |  |  |  |
Total stock-based compensation | 745,636 | 364,248 | 1,498,217 | 1,084,826 | 1,449,074 | 795,803
Stock-based Compensation [Member] | Publisher Partner Warrant [Member] |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |
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
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 | 163,181 | 122,192
Selling and marketing |  | 323,164 |  | 920,566 | 1,486,722 | 34,393
General and administrative | 414,163 | 80,306 | 559,505 | 238,558 | 317,982 | 2,541,468
Total costs charged to operations | 425,971 | 439,080 | 620,343 | 1,268,060 | 1,967,885 | 2,698,053
Capitalized platform development | 2,328 | 88,619 | 11,276 | 234,611 | 361,519 | 535,004
Total stock-based compensation | 428,299 | 527,699 | 631,619 | 1,502,671 | 2,329,404 | 3,233,057
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 | 156,043 | 44,520
Selling and marketing | 3,970 | 42,695 | 13,899 | 102,206 | 114,640 | 100,388
General and administrative | 78,017 | 127,786 | 297,283 | 437,614 | 615,604 | 1,660,607
Total costs charged to operations | 105,204 | 223,630 | 480,664 | 690,735 | 886,287 | 1,805,515
Capitalized platform development |  | 32,680 | 5,071 | 154,445 | 178,284 | 175,837
Total stock-based compensation | 105,204 | 256,310 | 485,735 | 845,180 | 1,064,571 | 1,981,352
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 | 3,975,625 | 774,632
Selling and marketing | 1,341,948 | 734,391 | 3,820,996 | 2,114,595 | 2,454,432 | 455,280
General and administrative | 4,081,766 | 855,390 | 10,344,247 | 2,430,553 | 3,439,803 | 3,383,338
Total costs charged to operations | 7,119,861 | 2,768,057 | 18,860,168 | 7,806,690 | 9,869,860 | 4,613,250
Capitalized platform development | 483,854 | 267,013 | 1,324,805 | 864,656 | 1,062,792 | 590,618
Total stock-based compensation | 7,603,715 | 3,035,070 | 20,184,973 | 8,671,346 | 10,932,652 | 5,203,868
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 | 8,394 | 1,580
Selling and marketing | 75,193 | 43,900 | 224,371 | 142,767 | 272,431 | 242,399
General and administrative |  |  |  | 150,577 | 150,577 | 157,359
Total costs charged to operations | 76,160 | 46,371 | 228,834 | 298,988 | 431,402 | 401,338
Capitalized platform development | 2,690 | 1,188 | 6,472 | 5,451 | 6,400 | 5,931
Total stock-based compensation | $ 78,850 | $ 47,559 | $ 235,306 | $ 304,439 | $ 437,802 | $ 407,269

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