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Warrants - Summary of Warrants Issued to Purchase Common Stock (Parenthetical) (Detail)	6 Months Ended
	Jun. 30, 2022
February 12, 2020 Service and Performance Warrants [Member]
Class of Warrant or Right [Line Items]
Warrant expiration month and year	2022-02
February 3, 2020 Service and Performance Warrants [Member]
Class of Warrant or Right [Line Items]
Warrant expiration month and year	2022-02

X

- Definition

Warrant expiration month and year.

+ References

No definition available.

+ Details

Name:	rkda_WarrantExpirationMonthAndYear
Namespace Prefix:	rkda_
Data Type:	xbrli:gYearMonthItemType
Balance Type:	na
Period Type:	duration

X

- Definition

Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table.

+ References

No definition available.

+ Details

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

X

- Details

Name:	us-gaap_ClassOfWarrantOrRightAxis=rkda_February122020ServiceAndPerformanceWarrantsMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

X

- Details

Name:	us-gaap_ClassOfWarrantOrRightAxis=rkda_February32020ServiceAndPerformanceWarrantsMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type: