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COMMITMENTS AND CONTINGENCIES - Narrative (Details) $ in Thousands	3 Months Ended
	Mar. 31, 2018 USD ($) option claim1	Mar. 31, 2017 USD ($)
Commitments and Contingencies Disclosure [Abstract]
Number of claim or actions pending | claim1	0
Number of options for individual two-year extensions | option	2
Term of optional individual extensions	2 years
Annual increases in base rent (as a percent)	3.00%
Rent expense | $	$ 174	$ 179
Contract termination, notice period	30 days

X

- Definition

Contractual obligation, contract termination notice period.

+ References

No definition available.

+ Details

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Namespace Prefix:	cdtx_
Data Type:	xbrli:durationItemType
Balance Type:	na
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X

- Definition

Increase in base rent annual.

+ References

No definition available.

+ Details

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

X

- Definition

Number of operating lease options for extension

+ References

No definition available.

+ Details

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Namespace Prefix:	cdtx_
Data Type:	xbrli:integerItemType
Balance Type:	na
Period Type:	duration

X

- References

No definition available.

+ Details

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X

- Definition

Amount of rent expense incurred for leased assets, including but not limited to, furniture and equipment, that is not directly or indirectly associated with the manufacture, sale or creation of a product or product line.

+ References

No definition available.

+ Details

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Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	duration

X

- Definition

Term of the lessee's leasing arrangement renewal, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days.

+ References

No definition available.

+ Details

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

X

- Definition

Number of pending claims pertaining to a loss contingency.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 450
-SubTopic 20
-Section 50
-Paragraph 4
-Subparagraph (a)
-URI http://asc.fasb.org/extlink&oid=25496072&loc=d3e14435-108349

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