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Common Stock - Additional Information (Detail)			6 Months Ended
	Apr. 09, 2019	Aug. 08, 2018 shares	Mar. 31, 2021 $ / shares shares	Sep. 30, 2020 shares	Apr. 09, 2020 $ / shares
Class of Warrant or Right [Line Items]
Warrants term			5 years
Warrants of common stock exercise price | $ / shares			$ 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
2018 Equity Incentive Plan [Member]
Class of Warrant or Right [Line Items]
Common stock, stock split			2.5-for-1 stock split effected
Stock split ratio	2.5
Increase in number of shares authorized for issuance		1,000,000

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- Definition

Class of warrants or right issued.

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Maximum percentage of stock pertaining to restrictions.

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

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-Name Accounting Standards Codification
-Topic 505
-SubTopic 10
-Section 50
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-URI http://asc.fasb.org/extlink&oid=109259400&loc=d3e21475-112644

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Number of warrants or rights outstanding.

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- Definition

Description of the stock split arrangement. Also provide the retroactive effect given by a stock split that occurs after the balance date but before the release of financial statements.

+ References

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Ratio applied to the conversion of stock split, for example but not limited to, one share converted to two or two shares converted to one.

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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
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