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Stock-based Compensation (Stock-Based Compensation Expense) (Details) (USD $)
 12 Months Ended
Dec. 31, 2014
Dec. 31, 2013
Dec. 31, 2012
Schedule of stock-based compensation expense      
Stock-based compensation $ 4,620,000us-gaap_ShareBasedCompensation $ 4,389,000us-gaap_ShareBasedCompensation $ 5,076,000us-gaap_ShareBasedCompensation
Research and Development [Member]      
Schedule of stock-based compensation expense      
Stock-based compensation 953,000us-gaap_ShareBasedCompensation
/ us-gaap_IncomeStatementLocationAxis
= us-gaap_ResearchAndDevelopmentExpenseMember		 1,201,000us-gaap_ShareBasedCompensation
/ us-gaap_IncomeStatementLocationAxis
= us-gaap_ResearchAndDevelopmentExpenseMember		 2,334,000us-gaap_ShareBasedCompensation
/ us-gaap_IncomeStatementLocationAxis
= us-gaap_ResearchAndDevelopmentExpenseMember
Sales, general and administrative [Member]      
Schedule of stock-based compensation expense      
Stock-based compensation $ 3,667,000us-gaap_ShareBasedCompensation
/ us-gaap_IncomeStatementLocationAxis
= cdxs_SalesGeneralAndAdministrativeMember		 $ 3,188,000us-gaap_ShareBasedCompensation
/ us-gaap_IncomeStatementLocationAxis
= cdxs_SalesGeneralAndAdministrativeMember		 $ 2,742,000us-gaap_ShareBasedCompensation
/ us-gaap_IncomeStatementLocationAxis
= cdxs_SalesGeneralAndAdministrativeMember