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Trade Accounts Receivable (Details) - USD ($) $ in Thousands	Jan. 31, 2022	Jul. 31, 2021
Receivables [Abstract]
Prepaid expenses and other current assets	$ 122	$ 111
Other assets	$ 1,400	$ 1,500

X

- Definition

Amount of deferred cost assets and assets classified as other.

+ References

No definition available.

+ Details

Name:	us-gaap_DeferredCostsAndOtherAssets
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	instant

X

- Definition

Amount of asset related to consideration paid in advance for costs that provide economic benefits in future periods, and amount of other assets.

+ References

No definition available.

+ Details

Name:	us-gaap_PrepaidExpenseAndOtherAssets
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	instant

X

- References

No definition available.

+ Details

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