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Investment Securities (Components of Cash Equivalents and Marketable Securities) (Details) (USD $)
In Thousands, unless otherwise specified
Mar. 31, 2015
securities
Dec. 31, 2014
Cash Equivalents and Marketable Securities [Line Items]    
Adjusted Cost $ 15,166us-gaap_AvailableForSaleSecuritiesAmortizedCost $ 15,165us-gaap_AvailableForSaleSecuritiesAmortizedCost
Gross Unrealized Gains 149cdxs_AvailableforsaleSecuritiesAccumulatedGrossUnrealizedGainbeforeTax 125cdxs_AvailableforsaleSecuritiesAccumulatedGrossUnrealizedGainbeforeTax
Gross Unrealized Losses 0cdxs_AvailableforsaleSecuritiesAccumulatedGrossUnrealizedLossbeforeTax 0cdxs_AvailableforsaleSecuritiesAccumulatedGrossUnrealizedLossbeforeTax
Estimated Fair Value 15,315us-gaap_AvailableForSaleSecurities 15,290us-gaap_AvailableForSaleSecurities
Number of Marketable Securities 0cdxs_NumberOfMarketableSecurities  
Money market funds [Member]    
Cash Equivalents and Marketable Securities [Line Items]    
Adjusted Cost 14,603us-gaap_AvailableForSaleSecuritiesAmortizedCost
/ cdxs_CashEquivalentsAndMarketableSecuritiesByTypeAxis
= us-gaap_MoneyMarketFundsMember		 14,602us-gaap_AvailableForSaleSecuritiesAmortizedCost
/ cdxs_CashEquivalentsAndMarketableSecuritiesByTypeAxis
= us-gaap_MoneyMarketFundsMember
Gross Unrealized Gains 0cdxs_AvailableforsaleSecuritiesAccumulatedGrossUnrealizedGainbeforeTax
/ cdxs_CashEquivalentsAndMarketableSecuritiesByTypeAxis
= us-gaap_MoneyMarketFundsMember		 0cdxs_AvailableforsaleSecuritiesAccumulatedGrossUnrealizedGainbeforeTax
/ cdxs_CashEquivalentsAndMarketableSecuritiesByTypeAxis
= us-gaap_MoneyMarketFundsMember
Gross Unrealized Losses 0cdxs_AvailableforsaleSecuritiesAccumulatedGrossUnrealizedLossbeforeTax
/ cdxs_CashEquivalentsAndMarketableSecuritiesByTypeAxis
= us-gaap_MoneyMarketFundsMember		 0cdxs_AvailableforsaleSecuritiesAccumulatedGrossUnrealizedLossbeforeTax
/ cdxs_CashEquivalentsAndMarketableSecuritiesByTypeAxis
= us-gaap_MoneyMarketFundsMember
Estimated Fair Value 14,603us-gaap_AvailableForSaleSecurities
/ cdxs_CashEquivalentsAndMarketableSecuritiesByTypeAxis
= us-gaap_MoneyMarketFundsMember		 14,602us-gaap_AvailableForSaleSecurities
/ cdxs_CashEquivalentsAndMarketableSecuritiesByTypeAxis
= us-gaap_MoneyMarketFundsMember
Common shares of CO2 Solution [Member]    
Cash Equivalents and Marketable Securities [Line Items]    
Adjusted Cost 563us-gaap_AvailableForSaleSecuritiesAmortizedCost
/ cdxs_CashEquivalentsAndMarketableSecuritiesByTypeAxis
= cdxs_CommonSharesOfCoTwoSolutionMember		 563us-gaap_AvailableForSaleSecuritiesAmortizedCost
/ cdxs_CashEquivalentsAndMarketableSecuritiesByTypeAxis
= cdxs_CommonSharesOfCoTwoSolutionMember
Gross Unrealized Gains 149cdxs_AvailableforsaleSecuritiesAccumulatedGrossUnrealizedGainbeforeTax
/ cdxs_CashEquivalentsAndMarketableSecuritiesByTypeAxis
= cdxs_CommonSharesOfCoTwoSolutionMember		 125cdxs_AvailableforsaleSecuritiesAccumulatedGrossUnrealizedGainbeforeTax
/ cdxs_CashEquivalentsAndMarketableSecuritiesByTypeAxis
= cdxs_CommonSharesOfCoTwoSolutionMember
Gross Unrealized Losses 0cdxs_AvailableforsaleSecuritiesAccumulatedGrossUnrealizedLossbeforeTax
/ cdxs_CashEquivalentsAndMarketableSecuritiesByTypeAxis
= cdxs_CommonSharesOfCoTwoSolutionMember		 0cdxs_AvailableforsaleSecuritiesAccumulatedGrossUnrealizedLossbeforeTax
/ cdxs_CashEquivalentsAndMarketableSecuritiesByTypeAxis
= cdxs_CommonSharesOfCoTwoSolutionMember
Estimated Fair Value $ 712us-gaap_AvailableForSaleSecurities
/ cdxs_CashEquivalentsAndMarketableSecuritiesByTypeAxis
= cdxs_CommonSharesOfCoTwoSolutionMember		 $ 688us-gaap_AvailableForSaleSecurities
/ cdxs_CashEquivalentsAndMarketableSecuritiesByTypeAxis
= cdxs_CommonSharesOfCoTwoSolutionMember