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Pay vs Performance Disclosure - USD ($)
 12 Months Ended
Dec. 31, 2022
Dec. 31, 2021
Dec. 31, 2020
Pay vs Performance Disclosure [Table]      
Pay vs Performance [Table Text Block]
Year
Summary Compensation Table Total for PEO(1)
Compensation Actually Paid to PEO(1)(2)
Average Summary Compensation Table Total for Non-PEO NEOs(3)
Average Compensation Actually Paid to Non-PEO NEOs(2)(3)
Value of Initial Fixed $100 Investment Based on:
Net Income (loss)(5)
Transaction Value(6)
Adjusted EBITDA(6)
Total Shareholder Return(4)
Peer Group Total Shareholder Return(4)
2022
4,952,016(1,285,005)2,123,426 (37,672)31.23 113.16 (72,446)737,514 22,858 
20211,059,848(28,825,351)1,711,239 (3,716,106)48.46 157.59 (8,475)1,018,970 58,167 
2020
36,121,72973,005,673 19,523,454 40,775,284 122.63 117.14 10,562 815,712 58,074 
    
Company Selected Measure Name Adjusted EBITDA    
Named Executive Officers, Footnote [Text Block] For 2022, 2021 and 2020, our PEO was Mr. Yi. For 2022, our non-PEO NEOs were Messrs. Nonko, Thompson, and Coyne and Ms. Cunningham. For 2021, our non-PEO NEOs were Messrs. Nonko, Thompson, and Coyne and Ms. Cunningham, as well as Mr. Sinanyan, our Former Chief Financial Officer, Mr. Carlson, our Former Interim Principal Financial Officer, Mr. Cramer, our SVP, Supply Partnerships, and Ms. Yeh, our SVP, Technology. For 2020, our non-PEO NEOs were Mr. Nonko and Mr. Sinanyan.    
PEO Total Compensation Amount $ 4,952,016 $ 1,059,848 $ 36,121,729
PEO Actually Paid Compensation Amount $ (1,285,005) (28,825,351) 73,005,673
Adjustment To PEO Compensation, Footnote [Text Block] In calculating the “compensation actually paid” amounts reflected in these columns, the fair value or change in fair value, as applicable, of the equity award adjustments included in such calculations were computed in accordance with FASB ASC Topic 718. The valuation assumptions used to calculate such fair values do not materially differ from the assumptions used to calculate grant date fair value. In the calculation of compensation actually paid and presented in the table, the following amounts were deducted and added:
PEO
2022
2021
2020
Total Compensation Reported in Summary Compensation Table for the Year Indicated
$4,952,016 $1,059,848 $36,121,729 
Less, Grant Date Fair Value of Stock Awards Reported in the Summary Compensation Table for the Year Indicated
(4,372,938)(41,068)(34,917,535)
Plus, Year-End Fair Value of Awards Granted in the Year Indicated that were Outstanding and Unvested at Year-End of Such Year
2,366,299 — 71,801,479 
Plus, Fair Value of Awards Granted in the Year Indicated that Vested in the Year Indicated
615,217 — — 
Plus, Change in Fair Value of Awards Granted in Prior Years that were Outstanding and Unvested at Year-End (From Prior Year-End to Year-End)
(3,363,141)(28,951,003)— 
Plus, Change in Fair Value of Awards Granted in Prior Years that Vested in the Year Indicated (From Prior Year-End to Vesting Date)
(1,482,458)(893,128)— 
Less, Fair Value of Stock Awards Forfeited in the Year Indicated (From Prior Year-End)
— — — 
Total Adjustments$(1,285,005)$(28,825,351)$73,005,673 
Average of Non-PEO NEOs
2022
2021
2020
Total Average Compensation Reported in Summary Compensation Table for the Year Indicated
$2,123,426 $1,711,239 $19,523,454 
Less, Average Grant Date Fair Value of Stock Awards Reported in the Summary Compensation Table for the Year Indicated
(1,675,544)(1,287,362)(18,500,404)
Plus, Average Year-End Fair Value of Awards Granted in the Year Indicated that were Outstanding and Unvested at Year-End of Such Year
922,631 1,113,272 38,272,191 
Plus, Fair Value of Awards Granted in the Year Indicated that Vested in the Year Indicated
239,875 50,801 — 
Plus, Average Change in Fair Value of Awards Granted in Prior Years that were Outstanding and Unvested at Year-End (From Prior Year-End to Year-End)
(1,123,524)(4,487,479)1,339,534 
Plus, Average Change in Fair Value of Awards Granted in Prior Years that Vested in the Year Indicated (From Prior Year-End to Vesting Date)
(524,536)(204,478)140,509 
Less, Average Fair Value of Stock Awards Forfeited in the Year Indicated (From Prior Year-End)
— (612,099)— 
Total Average Adjustments$(37,672)$(3,716,106)$40,775,284 
    
Non-PEO NEO Average Total Compensation Amount $ 2,123,426 1,711,239 19,523,454
Non-PEO NEO Average Compensation Actually Paid Amount $ (37,672) (3,716,106) 40,775,284
Adjustment to Non-PEO NEO Compensation Footnote [Text Block] In calculating the “compensation actually paid” amounts reflected in these columns, the fair value or change in fair value, as applicable, of the equity award adjustments included in such calculations were computed in accordance with FASB ASC Topic 718. The valuation assumptions used to calculate such fair values do not materially differ from the assumptions used to calculate grant date fair value. In the calculation of compensation actually paid and presented in the table, the following amounts were deducted and added:
PEO
2022
2021
2020
Total Compensation Reported in Summary Compensation Table for the Year Indicated
$4,952,016 $1,059,848 $36,121,729 
Less, Grant Date Fair Value of Stock Awards Reported in the Summary Compensation Table for the Year Indicated
(4,372,938)(41,068)(34,917,535)
Plus, Year-End Fair Value of Awards Granted in the Year Indicated that were Outstanding and Unvested at Year-End of Such Year
2,366,299 — 71,801,479 
Plus, Fair Value of Awards Granted in the Year Indicated that Vested in the Year Indicated
615,217 — — 
Plus, Change in Fair Value of Awards Granted in Prior Years that were Outstanding and Unvested at Year-End (From Prior Year-End to Year-End)
(3,363,141)(28,951,003)— 
Plus, Change in Fair Value of Awards Granted in Prior Years that Vested in the Year Indicated (From Prior Year-End to Vesting Date)
(1,482,458)(893,128)— 
Less, Fair Value of Stock Awards Forfeited in the Year Indicated (From Prior Year-End)
— — — 
Total Adjustments$(1,285,005)$(28,825,351)$73,005,673 
Average of Non-PEO NEOs
2022
2021
2020
Total Average Compensation Reported in Summary Compensation Table for the Year Indicated
$2,123,426 $1,711,239 $19,523,454 
Less, Average Grant Date Fair Value of Stock Awards Reported in the Summary Compensation Table for the Year Indicated
(1,675,544)(1,287,362)(18,500,404)
Plus, Average Year-End Fair Value of Awards Granted in the Year Indicated that were Outstanding and Unvested at Year-End of Such Year
922,631 1,113,272 38,272,191 
Plus, Fair Value of Awards Granted in the Year Indicated that Vested in the Year Indicated
239,875 50,801 — 
Plus, Average Change in Fair Value of Awards Granted in Prior Years that were Outstanding and Unvested at Year-End (From Prior Year-End to Year-End)
(1,123,524)(4,487,479)1,339,534 
Plus, Average Change in Fair Value of Awards Granted in Prior Years that Vested in the Year Indicated (From Prior Year-End to Vesting Date)
(524,536)(204,478)140,509 
Less, Average Fair Value of Stock Awards Forfeited in the Year Indicated (From Prior Year-End)
— (612,099)— 
Total Average Adjustments$(37,672)$(3,716,106)$40,775,284 
    
Compensation Actually Paid vs. Total Shareholder Return [Text Block] max-20230404_g6.jpg    
Compensation Actually Paid vs. Net Income [Text Block]
Pay-versus-Performance Comparative Disclosure
The following reflect the relationships between (i) compensation actually paid (“CAP” in the graphics below) to our PEO, and the average compensation actually paid to our non-PEO NEOs, to our net income, Adjusted EBITDA, Transaction Value, and the Company’s cumulative TSR for the years 2020 through 2022, and (ii) the Company’s cumulative TSR and our peer group TSR for the same period.
max-20230404_g3.jpg 		   
Compensation Actually Paid vs. Company Selected Measure [Text Block] max-20230404_g4.jpg    
Total Shareholder Return Vs Peer Group [Text Block] The Company Total Shareholder Return ("TSR") and the Company’s Peer Group TSR reflected in these columns for each applicable fiscal year is calculated based on a fixed investment of $100 at the applicable measurement point on the same cumulative basis as is used in Item 201(e) of Regulation S-K. The peer group used to determine the Company’s Peer Group TSR for each applicable fiscal year is the following published industry index, as disclosed in our Annual Report on Form 10-K for the year ended December 31, 2022 pursuant to Item 201(e) of Regulation S-K: S&P 500 Information Technology Index.max-20230404_g7.jpg    
Tabular List [Table Text Block]
Most Important Performance Measures
Adjusted EBITDA
Transaction Value
    
Total Shareholder Return Amount $ 31.23 48.46 122.63
Peer Group Total Shareholder Return Amount 113.16 157.59 117.14
Net Income (Loss) $ (72,446,000) $ (8,475,000) $ 10,562,000
Company Selected Measure Amount 22,858,000 58,167,000 58,074,000
PEO Name Mr. Yi.    
Additional 402(v) Disclosure [Text Block] Represents, in thousands, the amount of net income (loss) reflected in the Company’s audited financial statements for the year indicated.    
Measure [Axis]: 1      
Pay vs Performance Disclosure [Table]      
Measure Name Adjusted EBITDA    
Non-GAAP Measure Description [Text Block] We have selected Adjusted EBITDA as our most important financial measure (that is not otherwise required to be disclosed in the table) used to link “compensation actually paid” to our NEOs to Company performance for fiscal year 2022. We also used Transaction Value, which is an operating metric, to link “compensation actually paid” to our NEOs to Company performance for fiscal year 2022. Our Compensation Committee tied the incentive bonus plan for the NEOs for 2022 to achievement of these two measures. See additional information under the heading “Compensation Discussion and Analysis - Analysis of Fiscal 2022 Compensation – Annual Incentive Bonus Plan” above.    
Measure [Axis]: 2      
Pay vs Performance Disclosure [Table]      
Compensation Actually Paid vs. Other Measure [Text Block] max-20230404_g5.jpg    
Other Performance Measure Amount 737,514,000 1,018,970,000 815,712,000
Measure Name Transaction Value    
Non-GAAP Measure Description [Text Block] We have selected Adjusted EBITDA as our most important financial measure (that is not otherwise required to be disclosed in the table) used to link “compensation actually paid” to our NEOs to Company performance for fiscal year 2022. We also used Transaction Value, which is an operating metric, to link “compensation actually paid” to our NEOs to Company performance for fiscal year 2022. Our Compensation Committee tied the incentive bonus plan for the NEOs for 2022 to achievement of these two measures. See additional information under the heading “Compensation Discussion and Analysis - Analysis of Fiscal 2022 Compensation – Annual Incentive Bonus Plan” above.    
PEO [Member] | Equity Awards Reported Value [Member]      
Pay vs Performance Disclosure [Table]      
Adjustment to Compensation Amount $ (4,372,938) $ (41,068) $ (34,917,535)
PEO [Member] | Equity Awards Granted During The Year, Unvested [Member]      
Pay vs Performance Disclosure [Table]      
Adjustment to Compensation Amount 2,366,299 0 71,801,479
PEO [Member] | Equity Awards Granted During The Year, Vested [Member]      
Pay vs Performance Disclosure [Table]      
Adjustment to Compensation Amount 615,217 0 0
PEO [Member] | Equity Awards Granted In Prior Years, Unvested [Member]      
Pay vs Performance Disclosure [Table]      
Adjustment to Compensation Amount (3,363,141) (28,951,003) 0
PEO [Member] | Equity Awards Granted In Prior Years, Vested [Member]      
Pay vs Performance Disclosure [Table]      
Adjustment to Compensation Amount (1,482,458) (893,128) 0
PEO [Member] | Equity Awards Granted In Prior Years, Forfeited [Member]      
Pay vs Performance Disclosure [Table]      
Adjustment to Compensation Amount 0 0 0
Non-PEO NEO [Member] | Equity Awards Reported Value [Member]      
Pay vs Performance Disclosure [Table]      
Adjustment to Compensation Amount (1,675,544) (1,287,362) (18,500,404)
Non-PEO NEO [Member] | Equity Awards Granted During The Year, Unvested [Member]      
Pay vs Performance Disclosure [Table]      
Adjustment to Compensation Amount 922,631 1,113,272 38,272,191
Non-PEO NEO [Member] | Equity Awards Granted During The Year, Vested [Member]      
Pay vs Performance Disclosure [Table]      
Adjustment to Compensation Amount 239,875 50,801 0
Non-PEO NEO [Member] | Equity Awards Granted In Prior Years, Unvested [Member]      
Pay vs Performance Disclosure [Table]      
Adjustment to Compensation Amount (1,123,524) (4,487,479) 1,339,534
Non-PEO NEO [Member] | Equity Awards Granted In Prior Years, Vested [Member]      
Pay vs Performance Disclosure [Table]      
Adjustment to Compensation Amount (524,536) (204,478) 140,509
Non-PEO NEO [Member] | Equity Awards Granted In Prior Years, Forfeited [Member]      
Pay vs Performance Disclosure [Table]      
Adjustment to Compensation Amount $ 0 $ (612,099) $ 0