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Collaborative Arrangements - Commercial Agreement (Details) - Tate & Lyle - Commercial Agreement - USD ($) $ in Millions	3 Months Ended
	Dec. 31, 2020	Nov. 30, 2020
Collaborative Arrangements and Non-collaborative Arrangement Transactions [Line Items]
Contingent receivable		$ 1.1
Milestone payment amount	$ 0.4

X

- Definition

Receivable From Collaborative Arrangement

+ References

No definition available.

+ Details

Name:	cdxs_ReceivableFromCollaborativeArrangement
Namespace Prefix:	cdxs_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	duration

X

- Definition

Revenue Recognition, Contingent Receivable

+ References

No definition available.

+ Details

Name:	cdxs_RevenueRecognitionContingentReceivable
Namespace Prefix:	cdxs_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	instant

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

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Topic 808
-SubTopic 10
-Name Accounting Standards Codification
-Section 50
-Paragraph 1
-Subparagraph (d)
-Publisher FASB
-URI https://asc.fasb.org//1943274/2147479402/808-10-50-1

+ Details

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

X

- Details

Name:	srt_CounterpartyNameAxis=cdxs_TateLyleMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

X

- Details

Name:	us-gaap_TypeOfArrangementAxis=cdxs_CommercialAgreementMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type: