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Commitments, Contingencies, and Taxes - Additional Information (Detail)	Mar. 31, 2021	Dec. 31, 2020
Commitments Contingencies Taxes And Other [Abstract]
Percentage of valuation allowance	100.00%	100.00%

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- Definition

Commitments contingencies taxes and other.

+ References

No definition available.

+ Details

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- Definition

Deferred tax assets, valuation allowance, percentage.

+ References

No definition available.

+ Details

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Namespace Prefix:	mchx_
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