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Severance and Other Charges (Detail)	12 Months Ended
Severance and Other Charges (Detail)	Dec. 31, 2012
Number Of Employee Terminated	41

X

- Definition

Number of employee terminated during the period.

+ References

No definition available.

+ Details

Name:	cdti_NumberOfEmployeeTerminated
Namespace Prefix:	cdti_
Data Type:	xbrli:integerItemType
Balance Type:	na
Period Type:	duration