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Warrants (Details) (USD $)
3 Months Ended 12 Months Ended
Mar. 31, 2015
Dec. 31, 2014
Warrants (Details) [Line Items]    
Warrants Outstanding, Number (in Shares) 1,610,069cdti_WarrantsOutstandingNumber 1,610,069cdti_WarrantsOutstandingNumber
Warrants Outstanding, Weighted Average Exercise Price $ 3.54cdti_WarrantsOutstandingWeightedAverageExercisePrice $ 3.54cdti_WarrantsOutstandingWeightedAverageExercisePrice
Minimum [Member]    
Warrants (Details) [Line Items]    
Warrants Outstanding, Exercise Price Range,Weighted Average Exercise Price $ 1.25cdti_WarrantsOutstandingExercisePriceRangeWeightedAverageExercisePrice
/ us-gaap_RangeAxis
= us-gaap_MinimumMember
$ 1.25cdti_WarrantsOutstandingExercisePriceRangeWeightedAverageExercisePrice
/ us-gaap_RangeAxis
= us-gaap_MinimumMember
Maximum [Member]    
Warrants (Details) [Line Items]    
Warrants Outstanding, Exercise Price Range,Weighted Average Exercise Price $ 10.40cdti_WarrantsOutstandingExercisePriceRangeWeightedAverageExercisePrice
/ us-gaap_RangeAxis
= us-gaap_MaximumMember
$ 10.40cdti_WarrantsOutstandingExercisePriceRangeWeightedAverageExercisePrice
/ us-gaap_RangeAxis
= us-gaap_MaximumMember