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v3.23.1

Collaborative Arrangements - Additional Information (Detail) | 1 Months Ended
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Aug. 31, 2017
Collaborative Arrangements [Member] |
Collaborative Arrangements And Noncollaborative Arrangement Transactions [Line Items] |
Contractual agreement month and year | 2017-08

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- Definition Contractual agreement month and year. + References No definition available. + Details
Name: | rkda_ContractualAgreementMonthAndYear
Namespace Prefix: | rkda_
Data Type: | xbrli:gYearMonthItemType
Balance Type: | na
Period Type: | duration

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- 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_CollaborativeArrangementsAndNoncollaborativeArrangementTransactionsLineItems
Namespace Prefix: | us-gaap_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration

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- Details
Name: | us-gaap_TypeOfArrangementAxis=rkda_CollaborativeArrangementsCopromotionMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |