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Earnings Per Unit (Details) - USD ($) | 2 Months Ended | 3 Months Ended | 5 Months Ended | 6 Months Ended | 11 Months Ended | 12 Months Ended
--- | --- | --- | --- | --- | --- | ---
Mar. 31, 2020 | Jun. 30, 2021 | Mar. 31, 2021 | Jun. 30, 2020 | Jun. 30, 2020 | Jun. 30, 2021 | Jun. 30, 2020 | Dec. 31, 2020 | Dec. 31, 2020 | Dec. 31, 2019 | Dec. 31, 2018
Undeclared and undistributed earnings: |  |  |  |  |  |  |  |  |  |  |
Net (loss) income | $ (17,374) | $ (21,816,965) | $ 21,710,100 | $ (28,405) | $ (45,779) | $ (106,865) | $ (45,779) | $ (29,629,640) |  |  |
Marketwise, LLC |  |  |  |  |  |  |  |  |  |  |
Undeclared and undistributed earnings: |  |  |  |  |  |  |  |  |  |  |
Net (loss) income |  | (7,895,000) |  | (80,045,000) |  | (622,348,000) | (96,546,000) |  | $ (538,373,000) | $ 27,957,000 | $ 18,601,000
Undeclared and undistributed (loss) income |  | $ (9,076,000) |  | $ (88,423,000) |  | $ (637,446,000) | (162,691,000) |  | (640,140,000) | 7,486,000 | (3,416,000)
Common Class A |  |  |  |  |  |  |  |  |  |  |
Undeclared and undistributed earnings: |  |  |  |  |  |  |  |  |  |  |
Net (loss) income |  |  |  |  |  |  |  | $ 210,000 |  |  |
Denominator |  |  |  |  |  |  |  |  |  |  |
Weighted average units used in computing earnings per unit, basic |  | 41,400,000 |  | 0 | 0 | 41,400,000 |  | 41,400,000 |  |  |
Weighted average units used in computing earnings per unit, diluted |  | 41,400,000 |  | 0 | 0 | 41,400,000 |  | 41,400,000 |  |  |
Earnings per unit class: |  |  |  |  |  |  |  |  |  |  |
Basic net income per share (in usd per share) |  | $ 0.00 |  | $ 0 | $ 0 | $ 0.00 |  | $ 0.01 |  |  |
Diluted net income per share (in usd per share) |  | $ 0.00 |  | $ 0 | $ 0 | $ 0.00 |  | $ 0.01 |  |  |
Common Class A | Marketwise, LLC |  |  |  |  |  |  |  |  |  |  |
Numerator |  |  |  |  |  |  |  |  |  |  |
Distributed earnings |  | $ 1,181,000 |  | $ 8,378,000 |  | $ 15,098,000 | 66,145,000 |  | 101,767,000 | 20,471,000 | 22,017,000
Undeclared and undistributed earnings: |  |  |  |  |  |  |  |  |  |  |
Net (loss) income |  | (7,895,000) |  | (80,045,000) |  | (622,348,000) | (96,546,000) |  | (538,373,000) | 24,819,000 | 18,601,000
Minus: Distributions to Class A unitholders |  | 1,181,000 |  | 8,378,000 |  | 15,098,000 | 66,145,000 |  | 101,767,000 | 20,471,000 | 22,017,000
Undeclared and undistributed (loss) income |  | $ (9,076,000) |  | $ (88,423,000) |  | $ (637,446,000) | $ (162,691,000) |  | $ (640,140,000) | $ 4,348,000 | $ (3,416,000)
Denominator |  |  |  |  |  |  |  |  |  |  |
Weighted average units used in computing earnings per unit, basic |  | 528,519 |  | 547,466 |  | 528,519 | 548,596 |  | 548,028 | 594,327 | 611,547,000
Weighted average units used in computing earnings per unit, diluted |  | 528,519 |  | 547,466 |  | 528,519 | 548,596 |  | 548,028 | 594,327 | 611,547,000
Earnings per unit class: |  |  |  |  |  |  |  |  |  |  |
Distributed earnings per unit - basic (in usd per share) |  | $ 2.23 |  | $ 15.30 |  | $ 28.57 | $ 120.57 |  | $ 185.70 | $ 34.44 | $ 36.00
Distributed earnings per unit - diluted (in usd per share) |  | 2.23 |  | 15.30 |  | 28.57 | 120.57 |  | 185.70 | 34.44 | 36.00
Undistributed earnings (loss) per unit - basic (in usd per share) |  | (17.17) |  | (161.51) |  | (1,206.10) | (296.56) |  | (1,168.08) | 7.36 | (5.59)
Undistributed earnings (loss) per unit - diluted (in usd per share) |  | (17.17) |  | (161.51) |  | (1,206.10) | (296.56) |  | (1,168.08) | 7.36 | (5.59)
Basic net income per share (in usd per share) |  | (14.94) |  | (146.21) |  | (1,177.53) | (175.99) |  | (982.38) | 41.80 | 30.42
Diluted net income per share (in usd per share) |  | $ (14.94) |  | $ (146.21) |  | $ (1,177.53) | $ (175.99) |  | $ (982.38) | $ 41.80 | $ 30.42
Common Class B |  |  |  |  |  |  |  |  |  |  |
Undeclared and undistributed earnings: |  |  |  |  |  |  |  |  |  |  |
Net (loss) income |  |  |  |  |  |  |  | $ (350,000) |  |  |
Denominator |  |  |  |  |  |  |  |  |  |  |
Weighted average units used in computing earnings per unit, basic |  | 10,350,000 |  | 10,350,000 | 10,350,000 | 10,350,000 |  | 10,350,000 |  |  |
Weighted average units used in computing earnings per unit, diluted |  | 10,350,000 |  | 10,350,000 | 10,350,000 | 10,350,000 |  | 10,350,000 |  |  |
Earnings per unit class: |  |  |  |  |  |  |  |  |  |  |
Basic net income per share (in usd per share) |  | $ (2.11) |  | $ 0.00 | $ 0.00 | $ (0.02) |  | $ (2.88) |  |  |
Diluted net income per share (in usd per share) |  | $ (2.11) |  | $ 0.00 | $ 0.00 | $ (0.02) |  | $ (2.88) |  |  |
Common Class B | Marketwise, LLC |  |  |  |  |  |  |  |  |  |  |
Numerator |  |  |  |  |  |  |  |  |  |  |
Distributed earnings |  | $ 456,000 |  | $ 5,757,000 |  | $ 6,107,000 | $ 38,070,000 |  | $ 78,398,000 | $ 14,831,000 | $ 17,135,000
Undeclared and undistributed earnings: |  |  |  |  |  |  |  |  |  |  |
Net (loss) income |  | 456,000 |  | 5,757,000 |  | 6,107,000 | 38,070,000 |  | 78,398,000 | 17,969,000 | 17,135,000
Minus: Distributions to Class A unitholders |  | 456,000 |  | 5,757,000 |  | 6,107,000 | 38,070,000 |  | 78,398,000 | 14,831,000 | 17,135,000
Undeclared and undistributed (loss) income |  | $ 0 |  | $ 0 |  | $ 0 | $ 0 |  | $ 0 | $ 3,138,000 | $ 0
Denominator |  |  |  |  |  |  |  |  |  |  |
Weighted average units used in computing earnings per unit, basic |  | 526,580 |  | 496,732 |  | 526,580 | 495,201 |  | 495,971 | 416,369 | 395,000,000
Weighted average units used in computing earnings per unit, diluted |  | 526,580 |  | 496,732 |  | 526,580 | 495,201 |  | 495,971 | 416,369 | 395,000,000
Earnings per unit class: |  |  |  |  |  |  |  |  |  |  |
Distributed earnings per unit - basic (in usd per share) |  | $ 0.87 |  | $ 11.59 |  | $ 11.60 | $ 76.88 |  | $ 158.07 | $ 35.62 | $ 43.38
Distributed earnings per unit - diluted (in usd per share) |  | 0.87 |  | 11.59 |  | 11.60 | 76.88 |  | 158.07 | 35.62 | 43.38
Undistributed earnings (loss) per unit - basic (in usd per share) |  | 0 |  | 0 |  | 0 | 0 |  | 0 | 7.48 | 0
Undistributed earnings (loss) per unit - diluted (in usd per share) |  | 0 |  | 0 |  | 0 | 0 |  | 0 | 7.48 | 0
Basic net income per share (in usd per share) |  | 0.87 |  | 11.59 |  | 11.60 | 76.88 |  | 158.07 | 43.10 | 43.38
Diluted net income per share (in usd per share) |  | $ 0.87 |  | $ 11.59 |  | $ 11.60 | $ 76.88 |  | $ 158.07 | $ 43.10 | $ 43.38

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