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CONDENSED STATEMENTS OF OPERATIONS (Parenthetical)	Sep. 30, 2019 shares
Income Statement [Abstract]
Common Stock Subject To Possible Redemption	38,126,634

X

- Definition

Common Stock Subject To Possible Redemption.

+ References

No definition available.

+ Details

Name:	hyacu_CommonStockSubjectToPossibleRedemption
Namespace Prefix:	hyacu_
Data Type:	xbrli:sharesItemType
Balance Type:	na
Period Type:	instant

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- References

No definition available.

+ Details

Name:	us-gaap_IncomeStatementAbstract
Namespace Prefix:	us-gaap_
Data Type:	xbrli:stringItemType
Balance Type:	na
Period Type:	duration