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UNAUDITED CONDENSED CONSOLIDATED STATEMENTS OF OPERATIONS - USD ($) $ in Thousands | 3 Months Ended | 9 Months Ended | 12 Months Ended
--- | --- | --- | ---
Sep. 30, 2021 | Jun. 30, 2021 | Mar. 31, 2021 | Sep. 30, 2020 | Jun. 30, 2020 | Mar. 31, 2020 | Sep. 30, 2021 | Sep. 30, 2020 | Dec. 31, 2020 | Dec. 31, 2019 | Dec. 31, 2018
UNAUDITED CONDENSED CONSOLIDATED STATEMENTS OF OPERATIONS |  |  |  |  |  |  |  |  |  |  |
Revenue | $ 90,096 |  |  | $ 75,243 |  |  | $ 251,848 | $ 198,297 | $ 321,324 | $ 317,923 | $ 307,251
Costs and Expenses. |  |  |  |  |  |  |  |  |  |  |
Cost of revenue, excluding depreciation and amortization | 48,837 |  |  | 33,390 |  |  | 135,903 | 93,702 | 140,290 | 150,350 | 169,631
Sales and marketing | 11,218 |  |  | 11,995 |  |  | 34,170 | 39,063 | 50,680 | 79,845 | 81,251
General and administrative | 19,829 |  |  | 22,305 |  |  | 65,274 | 61,304 | 83,061 | 87,417 | 88,104
Research and development | 5,686 |  |  | 5,079 |  |  | 19,285 | 13,084 | 17,669 | 21,129 | 26,516
Depreciation and amortization | 5,407 |  |  | 4,358 |  |  | 15,033 | 13,508 | 17,486 | 19,450 | 21,827
Total costs and expenses | 90,977 |  |  | 77,127 |  |  | 269,665 | 220,661 | 309,186 | 358,191 | 387,329
Loss from operations | (881) |  |  | (1,884) |  |  | (17,817) | (22,364) | 12,138 | (40,268) | (80,078)
Other (expense) income, net | (2,442) |  |  | (258) |  |  | (2,278) | 426 | 670 | 2,991 | 2,474
Loss on disposition of subsidiary | (612) |  |  |  |  |  | (612) |  | (711) |  |
Loss before income taxes | (3,935) |  |  | (2,142) |  |  | (20,707) | (21,938) | 12,097 | (37,277) | (77,604)
Income tax provision (benefit) | (353) |  |  | (12) |  |  | (5,011) | (797) | 941 | (358) | 902
Net loss | (3,582) |  |  | (2,130) |  |  | (15,696) | (21,141) | 11,156 | (36,919) | (78,506)
Net income attributable to the redeemable noncontrolling interest | 67 | $ 85 | $ 60 | 62 | $ 323 | $ 383 | 212 | 768 | 820 | 273 | (971)
Net income attributable to noncontrolling interests | 137 |  |  |  |  |  | (173) |  |  |  |
Net loss | (3,786) |  |  | (2,192) | $ (6,093) | $ (13,624) | (15,735) | (21,909) | $ 10,336 | (37,192) | (77,535)
Adjusted net loss | $ (3,786) |  |  | $ (2,192) |  |  | $ (15,735) | $ (21,909) |  | $ (37,192) | $ (77,535)
Basic net loss per share | $ (0.06) |  |  | $ (0.06) |  |  | $ (0.28) | $ (0.56) | $ 0.00 | $ (0.96) | $ (2.05)
Diluted net loss per share | $ (0.06) |  |  | $ (0.06) |  |  | $ (0.28) | $ (0.56) | $ 0.00 | $ (0.96) | $ (2.05)
Weighted-average shares - basic | 60,840 |  |  | 39,043 |  |  | 57,072 | 39,009 | 39,027 | 38,571 | 37,856
Weighted-average shares - diluted | 60,840 |  |  | 39,043 |  |  | 57,072 | 39,009 | 39,027 | 38,571 | 37,856

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