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Short-Term Investments - Additional Information (Details) - USD ($)	9 Months Ended
	Sep. 30, 2015	Dec. 31, 2014
Investments Debt And Equity Securities [Abstract]
Short-term investments	$ 49,947,000	$ 0
Maturity Period of Short Term Investments	All available-for-sale securities held at September 30, 2015 will mature in less than one year.

X

- Definition

Maturity period of short term investments.

+ References

No definition available.

+ Details

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

X

- Definition

Amount of investment in debt and equity securities categorized neither as trading securities nor held-to-maturity securities and intended be sold or mature one year or operating cycle, if longer.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef



-Publisher FASB



-Name Accounting Standards Codification



-Topic 320



-SubTopic 10



-Section 25



-Paragraph 1



-Subparagraph (b)



-URI http://asc.fasb.org/extlink&oid=51813488&loc=d3e22054-111558



Reference 2: http://www.xbrl.org/2003/role/presentationRef



-Publisher FASB



-Name Accounting Standards Codification



-Topic 320



-SubTopic 10



-Section 45



-Paragraph 2



-URI http://asc.fasb.org/extlink&oid=49167202&loc=d3e26626-111562

+ Details

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

X

- References

No definition available.

+ Details

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