Inventory - Summary of Inventories (Detail) - USD ($) $ in Thousands	Dec. 31, 2019	Jun. 30, 2019
Inventory Disclosure [Abstract]
Raw materials	$ 67	$ 292
Goods in process	188	3,643
Finished goods	1,903	5,495
Inventories	$ 2,158	$ 9,430

Inventory goods ion process current and non current.

No definition available.

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