v3.26.1

Inventory - Summary of Inventories (Detail) - USD ($) $ in Thousands	Jun. 30, 2026	Dec. 31, 2025
Inventory Disclosure [Abstract]
Raw materials	$ 424	$ 257
Finished goods	506	955
Inventories	$ 930	$ 1,212

X

- Definition

Inventory current and non current net.

+ References

No definition available.

+ Details

Name:	rkda_InventoryCurrentAndNonCurrentNet
Namespace Prefix:	rkda_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	instant

X

- Definition

Inventory finished goods current and non-current.

+ References

No definition available.

+ Details

Name:	rkda_InventoryFinishedGoodsCurrentAndNonCurrent
Namespace Prefix:	rkda_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	instant

X

- Definition

Inventory raw materials current and non-current.

+ References

No definition available.

+ Details

Name:	rkda_InventoryRawMaterialsCurrentAndNonCurrent
Namespace Prefix:	rkda_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	instant

X

- References

No definition available.

+ Details

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