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Debt (Details) - Components of Debt (USD $)
In Thousands, unless otherwise specified
Mar. 31, 2015
Dec. 31, 2014
Debt (Details) - Components of Debt [Line Items]    
Line of credit with FGI $ 3,105us-gaap_LineOfCredit $ 2,841us-gaap_LineOfCredit
Debt, Total 10,605us-gaap_DebtLongtermAndShorttermCombinedAmount 10,317us-gaap_DebtLongtermAndShorttermCombinedAmount
Less current portion (3,105)us-gaap_DebtCurrent (2,841)us-gaap_DebtCurrent
Long-term debt, net of current portion 7,500us-gaap_LongTermDebtNoncurrent 7,476us-gaap_LongTermDebtNoncurrent
1.5 Million 8% Shareholder Note Due 2016 [Member]    
Debt (Details) - Components of Debt [Line Items]    
Shareholder Note Due 2016 1,605us-gaap_OtherNotesPayable
/ us-gaap_DebtInstrumentAxis
= cdti_OnePointFiveMillion8PercentShareholderNoteDue2016Member
1,598us-gaap_OtherNotesPayable
/ us-gaap_DebtInstrumentAxis
= cdti_OnePointFiveMillion8PercentShareholderNoteDue2016Member
3.0 Million 8% Subordinated Convertible Shareholder Notes Due 2016 [Member]    
Debt (Details) - Components of Debt [Line Items]    
$3.0 million, 8% subordinated convertible shareholder notes due 2016 (1) 2,954us-gaap_ConvertibleNotesPayable
/ us-gaap_DebtInstrumentAxis
= cdti_A3.0Million8PercentSubordinatedConvertibleShareholderNotesDue2016Member
2,947us-gaap_ConvertibleNotesPayable
/ us-gaap_DebtInstrumentAxis
= cdti_A3.0Million8PercentSubordinatedConvertibleShareholderNotesDue2016Member
3.0 million 8% Shareholder Note Due 2016 [Member]    
Debt (Details) - Components of Debt [Line Items]    
Shareholder Note Due 2016 $ 2,941us-gaap_OtherNotesPayable
/ us-gaap_DebtInstrumentAxis
= cdti_Threemillion8PercentShareholderNoteDue2016Member
$ 2,931us-gaap_OtherNotesPayable
/ us-gaap_DebtInstrumentAxis
= cdti_Threemillion8PercentShareholderNoteDue2016Member