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Inventory - Additional Information (Detail) - USD ($)	12 Months Ended
	Dec. 31, 2020	Dec. 31, 2019
Inventory Disclosure [Abstract]
Write-downs of wheat inventories, hemp seed inventories, and prepaid production	$ 4,300,000	$ 304,000

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- Definition

Inventory write down and prepaid production costs.

+ References

No definition available.

+ Details

Name:	rkda_InventoryWriteDownAndPrepaidProductionCosts
Namespace Prefix:	rkda_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	duration

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- References

No definition available.

+ Details

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