v2.4.0.6

Note 3 - Stock Based Compensation (Detail) (USD $) In Millions, except Share data, unless otherwise specified				19 Months Ended	51 Months Ended
	Mar. 31, 2013	Dec. 31, 2012	Jun. 30, 2012	Apr. 30, 2013 2006 Omnibus Incentive Plan [Member] Weighted-Average Period [Member]	Dec. 31, 2015 2006 Omnibus Incentive Plan [Member] Total Period [Member]	Dec. 31, 2015 Restricted Stock [Member]
Employee Service Share-based Compensation, Nonvested Awards, Total Compensation Cost Not yet Recognized (in Dollars)	$ 0.4					$ 5.1
Employee Service Share-based Compensation, Nonvested Awards, Total Compensation Cost Not yet Recognized, Period for Recognition				292 days	2 years
Stock Appreciation Rights Outstanding	0		142,593
Stock Appreciation Rights Outstanding	0		142,593
Grant Date Fair Value of Stock Appreciation Rights (in Dollars per share)		$ 8.64

X

- Definition

Grant date fair value of stock appreciation rights.

+ References

No definition available.

+ Details

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Namespace Prefix:	cldn_
Data Type:	num:perShareItemType
Balance Type:	na
Period Type:	instant

X

- Definition

The number of stock appreciation rights outstanding as of the balance sheet date.

+ References

No definition available.

+ Details

Name:	cldn_StockAppreciationRightsOutstanding
Namespace Prefix:	cldn_
Data Type:	xbrli:sharesItemType
Balance Type:	na
Period Type:	instant

X

- Definition

As of the balance sheet date, the aggregate unrecognized cost of equity-based awards made to employees under equity-based compensation awards that have yet to vest.

+ References

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

-Publisher FASB

-Name Accounting Standards Codification

-Topic 718

-SubTopic 10

-Section 50

-Paragraph 2

-Subparagraph (i)

-URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901



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

-Publisher FASB

-Name Statement of Financial Accounting Standard (FAS)

-Number 123R

-Paragraph A240

-Subparagraph h

-LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy.

+ Details

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

X

- Definition

Weighted average period over which unrecognized compensation is expected to be recognized for equity-based compensation plans, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days.

+ References

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

-Publisher FASB

-Name Accounting Standards Codification

-Topic 718

-SubTopic 10

-Section 50

-Paragraph 2

-Subparagraph (i)

-URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901

+ Details

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