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Common Stock - Additional Information (Detail) - $ / shares	9 Months Ended
	Jun. 30, 2021	Sep. 30, 2020	Apr. 09, 2020
Stockholders Equity Note [Abstract]
Warrants term	5 years
Warrants of common stock exercise price	$ 0.004		$ 3.98
Maximum percentage of stock pertaining to restrictions	24.90%
Extended term of outstanding warrants expiration period	5 years
Warrants of common stock expiration date	Sep. 30, 2023
Common stock, warrants issued	4,899,497	0
Common stock, warrants outstanding	4,899,497	0

X

- Definition

Class of warrants or right issued.

+ References

No definition available.

+ Details

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X

- Definition

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+ References

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X

- Definition

Maximum percentage of stock pertaining to restrictions.

+ References

No definition available.

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Namespace Prefix:	mesa_
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X

- Definition

Date the warrants or rights are exercisable, in CCYY-MM-DD format.

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 505
-SubTopic 10
-Section 50
-Paragraph 3
-URI http://asc.fasb.org/extlink&oid=109259400&loc=d3e21475-112644

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X

- Definition

Exercise price per share or per unit of warrants or rights outstanding.

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 505
-SubTopic 10
-Section 50
-Paragraph 3
-URI http://asc.fasb.org/extlink&oid=109259400&loc=d3e21475-112644

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X

- Definition

Number of warrants or rights outstanding.

+ References

No definition available.

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- References

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X

- Definition

Period between issuance and expiration of outstanding warrant and right embodying unconditional obligation requiring redemption by transferring asset at specified or determinable date or upon event certain to occur, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents reported fact of one year, five months, and thirteen days.

+ References

Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 820
-SubTopic 10
-Section 50
-Paragraph 2
-Subparagraph (bbb)(2)
-URI http://asc.fasb.org/extlink&oid=117815213&loc=d3e19207-110258

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