Debt instrument basis spread reduced on variable rate.

No definition available.

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Balance Type:	na
Period Type:	duration

- Definition

Debt instrument, covenants, obligated to maintain account cover amount percentage.

+ References

No definition available.

+ Details

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Period Type:	duration

- Definition

Debt instrument, end of term payment charge on funded amount percentage.

+ References

No definition available.

+ Details

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Namespace Prefix:	cdak_
Data Type:	num:percentItemType
Balance Type:	na
Period Type:	duration

- Definition

Debt instrument, interest only payment end date.

+ References

No definition available.

+ Details

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Namespace Prefix:	cdak_
Data Type:	xbrli:dateItemType
Balance Type:	na
Period Type:	duration

- Definition

Debt instrument, may extended interest only payment date.

+ References

No definition available.

+ Details

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Namespace Prefix:	cdak_
Data Type:	xbrli:dateItemType
Balance Type:	na
Period Type:	duration

- Definition

Debt instrument, number of tranches.

+ References

No definition available.

+ Details

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Data Type:	xbrli:integerItemType
Balance Type:	na
Period Type:	duration

- Definition

Percentage points added to the reference rate to compute the variable rate on the debt instrument.

+ References

No definition available.

+ Details

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Namespace Prefix:	us-gaap_
Data Type:	num:percentItemType
Balance Type:	na
Period Type:	duration

- Definition

Face (par) amount of debt instrument at time of issuance.

+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 835
-SubTopic 30
-Section 45
-Paragraph 2
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+ Details

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Balance Type:	credit
Period Type:	instant

- Definition

Description of the interest rate as being fixed or variable, and, if variable, identification of the index or rate on which the interest rate is based and the number of points or percentage added to that index or rate to set the rate, and other pertinent information, such as frequency of rate resets.

+ References

+ Details

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Balance Type:	na
Period Type:	duration

- 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_DebtInstrumentLineItems
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Data Type:	xbrli:stringItemType
Balance Type:	na
Period Type:	duration

- Definition

Date when the debt instrument is scheduled to be fully repaid, in CCYY-MM-DD format.

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 210
-SubTopic 10
-Section S99
-Paragraph 1
-Subparagraph (SX 210.5-02.22(a)(2))
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-Section 50
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+ Details

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Data Type:	xbrli:dateItemType
Balance Type:	na
Period Type:	duration

- Definition

Amount of the cost of borrowed funds accounted for as interest expense.

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 835
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+ Details

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Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	duration

- Definition

Amount of the total principal payments made during the annual reporting period.

+ References

Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 210
-SubTopic 10
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+ Details

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Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	duration

- Definition

Description of the credit facility's borrowing capacity including discussion of how the borrowing capacity is determined (for example, borrowing capacity based on the amount of current assets).

+ References

+ Details

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

- Definition

The effective interest rate during the reporting period.

+ References

+ Details

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Data Type:	num:percentItemType
Balance Type:	na
Period Type:	duration

- Definition

The carrying value as of the balance sheet date of the noncurrent portion of long-term obligations drawn from a line of credit, which is a bank's commitment to make loans up to a specific amount. Examples of items that might be included in the application of this element may consist of letters of credit, standby letters of credit, and revolving credit arrangements, under which borrowings can be made up to a maximum amount as of any point in time conditional on satisfaction of specified terms before, as of and after the date of drawdowns on the line. Includes short-term obligations that would normally be classified as current liabilities but for which (a) postbalance sheet date issuance of a long term obligation to refinance the short term obligation on a long term basis, or (b) the enterprise has entered into a financing agreement that clearly permits the enterprise to refinance the short-term obligation on a long term basis and the following conditions are met (1) the agreement does not expire within 1 year and is not cancelable by the lender except for violation of an objectively determinable provision, (2) no violation exists at the BS date, and (3) the lender has entered into the financing agreement is expected to be financially capable of honoring the agreement.

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+ Details

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Balance Type:	credit
Period Type:	instant

- Definition

The cash inflow from a debt initially having maturity due after one year or beyond the operating cycle, if longer.

+ References

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-Publisher FASB
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- Details

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- Details

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Indebtedness - Additional Information (Details)			3 Months Ended
Indebtedness - Additional Information (Details)	Jul. 24, 2020 USD ($)	Sep. 30, 2019 USD ($) Tranche	Mar. 31, 2021 USD ($)	Mar. 31, 2020 USD ($)	Dec. 31, 2020 USD ($)
Debt Instrument [Line Items]
Interest expense			$ 698,000	$ 295,000
Loan Agreement \| Term Loan \| Hercules
Debt Instrument [Line Items]
Number of tranches \| Tranche		4
Debt instrument, interest rate terms			Advances under the Term Loan Facility bear interest at a rate equal to the greater of (i) 9.00% plus the Prime Rate (as reported in The Wall Street Journal) less 5.25%, and (ii) 9.00%.
Interest rate		9.00%
Debt instrument, interest only payment end date		Apr. 01, 2022
Debt instrument, interest only payment period may extended date		Nov. 01, 2022
Debt instrument repayment end date		Oct. 01, 2024
Debt instrument, end of term payment charge on funded amount percentage		5.50%
Debt instrument, covenants, obligated to maintain account cover amount percentage		110.00%
Loan carrying value	$ 15,000,000	$ 9,500,000	$ 25,100,000		$ 25,000,000
Interest expense			700,000
Loan Agreement \| Term Loan \| Hercules \| Prime Rate
Debt Instrument [Line Items]
Variable interest rate		9.00%
Reduced from variable interest rate		5.25%
Loan Agreement \| Term Loan \| Hercules \| Maximum
Debt Instrument [Line Items]
Aggregate principal amount		$ 75,000,000
Interest expense				$ 300,000
Loan Agreement \| Term Loan \| Hercules \| Second Tranche
Debt Instrument [Line Items]
Aggregate principal amount			$ 10,000,000
Borrowing capacity term			second tranche was available under the Term Loan Facility, which allowed the Company to borrow an additional amount up to $10.0 million through March 31, 2021. As of March 31, 2021 the Company did not elect to borrow against the second $10.0 million tranche.
Interest rate		1.50%
Loan Agreement \| Term Loan \| Hercules \| Second Tranche \| Maximum
Debt Instrument [Line Items]
Aggregate principal amount		$ 10,000,000
Loan Agreement \| Term Loan \| Hercules \| First Tranche
Debt Instrument [Line Items]
Advanced amount under term loan	$ 15,000,000	$ 10,000,000
Interest rate		2.00%
Amount payable upon any prepayment or repayment		$ 1,400,000
Loan Agreement \| Term Loan \| Hercules \| Third Tranche
Debt Instrument [Line Items]
Borrowing capacity term			third tranche is available under the Term Loan Facility, which allows the Company to borrow an additional amount up to $10.0 million through June 30, 2021.
Interest rate		1.00%
Loan Agreement \| Term Loan \| Hercules \| Third Tranche \| Maximum
Debt Instrument [Line Items]
Aggregate principal amount		$ 10,000,000
Loan Agreement \| Term Loan \| Hercules \| Fourth Tranche
Debt Instrument [Line Items]
Borrowing capacity term			fourth tranche, which allows the Company to borrow an additional amount up to $30.0 million, will be available upon Hercules’ approval on or prior to December 15, 2021.
Loan Agreement \| Term Loan \| Hercules \| Fourth Tranche \| Maximum
Debt Instrument [Line Items]
Aggregate principal amount		$ 30,000,000