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CONSOLIDATED STATEMENTS OF STOCKHOLDERS' EQUITY (USD $)
In Thousands, except Share data
Total
Preferred Stock
Common Stock
Additional Paid-in Capital
Accumulated Other Comprehensive Income
Accumulated Deficit
Beginning Balance at Dec. 31, 2011 $ 18,313us-gaap_StockholdersEquity $ 9,496us-gaap_StockholdersEquity
/ us-gaap_StatementEquityComponentsAxis
= us-gaap_PreferredStockMember		 $ 51us-gaap_StockholdersEquity
/ us-gaap_StatementEquityComponentsAxis
= us-gaap_CommonStockMember		 $ 452,701us-gaap_StockholdersEquity
/ us-gaap_StatementEquityComponentsAxis
= us-gaap_AdditionalPaidInCapitalMember		 $ 0us-gaap_StockholdersEquity
/ us-gaap_StatementEquityComponentsAxis
= us-gaap_AccumulatedOtherComprehensiveIncomeMember		 $ (443,935)us-gaap_StockholdersEquity
/ us-gaap_StatementEquityComponentsAxis
= us-gaap_RetainedEarningsMember
Beginning Balance (in shares) at Dec. 31, 2011   3,000us-gaap_SharesOutstanding
/ us-gaap_StatementEquityComponentsAxis
= us-gaap_PreferredStockMember		 51,211,000us-gaap_SharesOutstanding
/ us-gaap_StatementEquityComponentsAxis
= us-gaap_CommonStockMember		      
Net loss (15,917)us-gaap_NetIncomeLoss 0us-gaap_NetIncomeLoss
/ us-gaap_StatementEquityComponentsAxis
= us-gaap_PreferredStockMember		 0us-gaap_NetIncomeLoss
/ us-gaap_StatementEquityComponentsAxis
= us-gaap_CommonStockMember		 0us-gaap_NetIncomeLoss
/ us-gaap_StatementEquityComponentsAxis
= us-gaap_AdditionalPaidInCapitalMember		 0us-gaap_NetIncomeLoss
/ us-gaap_StatementEquityComponentsAxis
= us-gaap_AccumulatedOtherComprehensiveIncomeMember		 (15,917)us-gaap_NetIncomeLoss
/ us-gaap_StatementEquityComponentsAxis
= us-gaap_RetainedEarningsMember
Issuance of common stock from public offering, net of expenses of $470 for 2014, $2733 for 2013 , and $550 for 2012 13,821us-gaap_StockIssuedDuringPeriodValueNewIssues 0us-gaap_StockIssuedDuringPeriodValueNewIssues
/ us-gaap_StatementEquityComponentsAxis
= us-gaap_PreferredStockMember		 5us-gaap_StockIssuedDuringPeriodValueNewIssues
/ us-gaap_StatementEquityComponentsAxis
= us-gaap_CommonStockMember		 13,816us-gaap_StockIssuedDuringPeriodValueNewIssues
/ us-gaap_StatementEquityComponentsAxis
= us-gaap_AdditionalPaidInCapitalMember		 0us-gaap_StockIssuedDuringPeriodValueNewIssues
/ us-gaap_StatementEquityComponentsAxis
= us-gaap_AccumulatedOtherComprehensiveIncomeMember		 0us-gaap_StockIssuedDuringPeriodValueNewIssues
/ us-gaap_StatementEquityComponentsAxis
= us-gaap_RetainedEarningsMember
Issuance of common stock from public offering, net of expenses of $470 for 2014, $2733 for 2013 , and $550 for 2012 (in shares)     4,487,000us-gaap_StockIssuedDuringPeriodSharesNewIssues
/ us-gaap_StatementEquityComponentsAxis
= us-gaap_CommonStockMember		      
Issuance of common stock from exercise of stock options and/or warrants, and purchases from ESPP(In Shares)     221,000cers_IssuanceOfCommonStockFromExerciseOfStockOptionsOrWarrantsAndPurchasesFromEmployeeStockPurchasePlansShares
/ us-gaap_StatementEquityComponentsAxis
= us-gaap_CommonStockMember		      
Issuance of common stock from exercise of stock options and/or warrants, and purchases from ESPP 349cers_IssuanceOfCommonStockFromExerciseOfStockOptionsOrWarrantsAndPurchasesFromEmployeeStockPurchasePlansValue 0cers_IssuanceOfCommonStockFromExerciseOfStockOptionsOrWarrantsAndPurchasesFromEmployeeStockPurchasePlansValue
/ us-gaap_StatementEquityComponentsAxis
= us-gaap_PreferredStockMember		 0cers_IssuanceOfCommonStockFromExerciseOfStockOptionsOrWarrantsAndPurchasesFromEmployeeStockPurchasePlansValue
/ us-gaap_StatementEquityComponentsAxis
= us-gaap_CommonStockMember		 349cers_IssuanceOfCommonStockFromExerciseOfStockOptionsOrWarrantsAndPurchasesFromEmployeeStockPurchasePlansValue
/ us-gaap_StatementEquityComponentsAxis
= us-gaap_AdditionalPaidInCapitalMember		 0cers_IssuanceOfCommonStockFromExerciseOfStockOptionsOrWarrantsAndPurchasesFromEmployeeStockPurchasePlansValue
/ us-gaap_StatementEquityComponentsAxis
= us-gaap_AccumulatedOtherComprehensiveIncomeMember		 0cers_IssuanceOfCommonStockFromExerciseOfStockOptionsOrWarrantsAndPurchasesFromEmployeeStockPurchasePlansValue
/ us-gaap_StatementEquityComponentsAxis
= us-gaap_RetainedEarningsMember
Preferred stock conversion (in shares)   (3,000)us-gaap_StockIssuedDuringPeriodSharesConversionOfConvertibleSecurities
/ us-gaap_StatementEquityComponentsAxis
= us-gaap_PreferredStockMember		 333,000us-gaap_StockIssuedDuringPeriodSharesConversionOfConvertibleSecurities
/ us-gaap_StatementEquityComponentsAxis
= us-gaap_CommonStockMember		      
Preferred stock conversion 0us-gaap_StockIssuedDuringPeriodValueConversionOfConvertibleSecurities (9,496)us-gaap_StockIssuedDuringPeriodValueConversionOfConvertibleSecurities
/ us-gaap_StatementEquityComponentsAxis
= us-gaap_PreferredStockMember		 0us-gaap_StockIssuedDuringPeriodValueConversionOfConvertibleSecurities
/ us-gaap_StatementEquityComponentsAxis
= us-gaap_CommonStockMember		 9,496us-gaap_StockIssuedDuringPeriodValueConversionOfConvertibleSecurities
/ us-gaap_StatementEquityComponentsAxis
= us-gaap_AdditionalPaidInCapitalMember		 0us-gaap_StockIssuedDuringPeriodValueConversionOfConvertibleSecurities
/ us-gaap_StatementEquityComponentsAxis
= us-gaap_AccumulatedOtherComprehensiveIncomeMember		 0us-gaap_StockIssuedDuringPeriodValueConversionOfConvertibleSecurities
/ us-gaap_StatementEquityComponentsAxis
= us-gaap_RetainedEarningsMember
Stock-based compensation 2,541us-gaap_AdjustmentsToAdditionalPaidInCapitalSharebasedCompensationRequisiteServicePeriodRecognitionValue 0us-gaap_AdjustmentsToAdditionalPaidInCapitalSharebasedCompensationRequisiteServicePeriodRecognitionValue
/ us-gaap_StatementEquityComponentsAxis
= us-gaap_PreferredStockMember		 0us-gaap_AdjustmentsToAdditionalPaidInCapitalSharebasedCompensationRequisiteServicePeriodRecognitionValue
/ us-gaap_StatementEquityComponentsAxis
= us-gaap_CommonStockMember		 2,541us-gaap_AdjustmentsToAdditionalPaidInCapitalSharebasedCompensationRequisiteServicePeriodRecognitionValue
/ us-gaap_StatementEquityComponentsAxis
= us-gaap_AdditionalPaidInCapitalMember		 0us-gaap_AdjustmentsToAdditionalPaidInCapitalSharebasedCompensationRequisiteServicePeriodRecognitionValue
/ us-gaap_StatementEquityComponentsAxis
= us-gaap_AccumulatedOtherComprehensiveIncomeMember		 0us-gaap_AdjustmentsToAdditionalPaidInCapitalSharebasedCompensationRequisiteServicePeriodRecognitionValue
/ us-gaap_StatementEquityComponentsAxis
= us-gaap_RetainedEarningsMember
Ending Balance at Dec. 31, 2012 19,107us-gaap_StockholdersEquity 0us-gaap_StockholdersEquity
/ us-gaap_StatementEquityComponentsAxis
= us-gaap_PreferredStockMember		 56us-gaap_StockholdersEquity
/ us-gaap_StatementEquityComponentsAxis
= us-gaap_CommonStockMember		 478,903us-gaap_StockholdersEquity
/ us-gaap_StatementEquityComponentsAxis
= us-gaap_AdditionalPaidInCapitalMember		 0us-gaap_StockholdersEquity
/ us-gaap_StatementEquityComponentsAxis
= us-gaap_AccumulatedOtherComprehensiveIncomeMember		 (459,852)us-gaap_StockholdersEquity
/ us-gaap_StatementEquityComponentsAxis
= us-gaap_RetainedEarningsMember
Ending Balance (in shares) at Dec. 31, 2012   0us-gaap_SharesOutstanding
/ us-gaap_StatementEquityComponentsAxis
= us-gaap_PreferredStockMember		 56,252,000us-gaap_SharesOutstanding
/ us-gaap_StatementEquityComponentsAxis
= us-gaap_CommonStockMember		      
Net loss (43,337)us-gaap_NetIncomeLoss 0us-gaap_NetIncomeLoss
/ us-gaap_StatementEquityComponentsAxis
= us-gaap_PreferredStockMember		 0us-gaap_NetIncomeLoss
/ us-gaap_StatementEquityComponentsAxis
= us-gaap_CommonStockMember		 0us-gaap_NetIncomeLoss
/ us-gaap_StatementEquityComponentsAxis
= us-gaap_AdditionalPaidInCapitalMember		 0us-gaap_NetIncomeLoss
/ us-gaap_StatementEquityComponentsAxis
= us-gaap_AccumulatedOtherComprehensiveIncomeMember		 (43,337)us-gaap_NetIncomeLoss
/ us-gaap_StatementEquityComponentsAxis
= us-gaap_RetainedEarningsMember
Other comprehensive income 7us-gaap_OtherComprehensiveIncomeLossNetOfTax 0us-gaap_OtherComprehensiveIncomeLossNetOfTax
/ us-gaap_StatementEquityComponentsAxis
= us-gaap_PreferredStockMember		 0us-gaap_OtherComprehensiveIncomeLossNetOfTax
/ us-gaap_StatementEquityComponentsAxis
= us-gaap_CommonStockMember		 0us-gaap_OtherComprehensiveIncomeLossNetOfTax
/ us-gaap_StatementEquityComponentsAxis
= us-gaap_AdditionalPaidInCapitalMember		 7us-gaap_OtherComprehensiveIncomeLossNetOfTax
/ us-gaap_StatementEquityComponentsAxis
= us-gaap_AccumulatedOtherComprehensiveIncomeMember		 0us-gaap_OtherComprehensiveIncomeLossNetOfTax
/ us-gaap_StatementEquityComponentsAxis
= us-gaap_RetainedEarningsMember
Issuance of common stock from public offering, net of expenses of $470 for 2014, $2733 for 2013 , and $550 for 2012 61,454us-gaap_StockIssuedDuringPeriodValueNewIssues 0us-gaap_StockIssuedDuringPeriodValueNewIssues
/ us-gaap_StatementEquityComponentsAxis
= us-gaap_PreferredStockMember		 15us-gaap_StockIssuedDuringPeriodValueNewIssues
/ us-gaap_StatementEquityComponentsAxis
= us-gaap_CommonStockMember		 61,439us-gaap_StockIssuedDuringPeriodValueNewIssues
/ us-gaap_StatementEquityComponentsAxis
= us-gaap_AdditionalPaidInCapitalMember		 0us-gaap_StockIssuedDuringPeriodValueNewIssues
/ us-gaap_StatementEquityComponentsAxis
= us-gaap_AccumulatedOtherComprehensiveIncomeMember		 0us-gaap_StockIssuedDuringPeriodValueNewIssues
/ us-gaap_StatementEquityComponentsAxis
= us-gaap_RetainedEarningsMember
Issuance of common stock from public offering, net of expenses of $470 for 2014, $2733 for 2013 , and $550 for 2012 (in shares)     15,019,000us-gaap_StockIssuedDuringPeriodSharesNewIssues
/ us-gaap_StatementEquityComponentsAxis
= us-gaap_CommonStockMember		      
Issuance of common stock from exercise of stock options and/or warrants, and purchases from ESPP(In Shares)     588,000cers_IssuanceOfCommonStockFromExerciseOfStockOptionsOrWarrantsAndPurchasesFromEmployeeStockPurchasePlansShares
/ us-gaap_StatementEquityComponentsAxis
= us-gaap_CommonStockMember		      
Issuance of common stock from exercise of stock options and/or warrants, and purchases from ESPP 2,296cers_IssuanceOfCommonStockFromExerciseOfStockOptionsOrWarrantsAndPurchasesFromEmployeeStockPurchasePlansValue 0cers_IssuanceOfCommonStockFromExerciseOfStockOptionsOrWarrantsAndPurchasesFromEmployeeStockPurchasePlansValue
/ us-gaap_StatementEquityComponentsAxis
= us-gaap_PreferredStockMember		 1cers_IssuanceOfCommonStockFromExerciseOfStockOptionsOrWarrantsAndPurchasesFromEmployeeStockPurchasePlansValue
/ us-gaap_StatementEquityComponentsAxis
= us-gaap_CommonStockMember		 2,295cers_IssuanceOfCommonStockFromExerciseOfStockOptionsOrWarrantsAndPurchasesFromEmployeeStockPurchasePlansValue
/ us-gaap_StatementEquityComponentsAxis
= us-gaap_AdditionalPaidInCapitalMember		 0cers_IssuanceOfCommonStockFromExerciseOfStockOptionsOrWarrantsAndPurchasesFromEmployeeStockPurchasePlansValue
/ us-gaap_StatementEquityComponentsAxis
= us-gaap_AccumulatedOtherComprehensiveIncomeMember		 0cers_IssuanceOfCommonStockFromExerciseOfStockOptionsOrWarrantsAndPurchasesFromEmployeeStockPurchasePlansValue
/ us-gaap_StatementEquityComponentsAxis
= us-gaap_RetainedEarningsMember
Stock-based compensation 3,268us-gaap_AdjustmentsToAdditionalPaidInCapitalSharebasedCompensationRequisiteServicePeriodRecognitionValue 0us-gaap_AdjustmentsToAdditionalPaidInCapitalSharebasedCompensationRequisiteServicePeriodRecognitionValue
/ us-gaap_StatementEquityComponentsAxis
= us-gaap_PreferredStockMember		 0us-gaap_AdjustmentsToAdditionalPaidInCapitalSharebasedCompensationRequisiteServicePeriodRecognitionValue
/ us-gaap_StatementEquityComponentsAxis
= us-gaap_CommonStockMember		 3,268us-gaap_AdjustmentsToAdditionalPaidInCapitalSharebasedCompensationRequisiteServicePeriodRecognitionValue
/ us-gaap_StatementEquityComponentsAxis
= us-gaap_AdditionalPaidInCapitalMember		 0us-gaap_AdjustmentsToAdditionalPaidInCapitalSharebasedCompensationRequisiteServicePeriodRecognitionValue
/ us-gaap_StatementEquityComponentsAxis
= us-gaap_AccumulatedOtherComprehensiveIncomeMember		 0us-gaap_AdjustmentsToAdditionalPaidInCapitalSharebasedCompensationRequisiteServicePeriodRecognitionValue
/ us-gaap_StatementEquityComponentsAxis
= us-gaap_RetainedEarningsMember
Ending Balance at Dec. 31, 2013 42,795us-gaap_StockholdersEquity 0us-gaap_StockholdersEquity
/ us-gaap_StatementEquityComponentsAxis
= us-gaap_PreferredStockMember		 72us-gaap_StockholdersEquity
/ us-gaap_StatementEquityComponentsAxis
= us-gaap_CommonStockMember		 545,905us-gaap_StockholdersEquity
/ us-gaap_StatementEquityComponentsAxis
= us-gaap_AdditionalPaidInCapitalMember		 7us-gaap_StockholdersEquity
/ us-gaap_StatementEquityComponentsAxis
= us-gaap_AccumulatedOtherComprehensiveIncomeMember		 (503,189)us-gaap_StockholdersEquity
/ us-gaap_StatementEquityComponentsAxis
= us-gaap_RetainedEarningsMember
Ending Balance (in shares) at Dec. 31, 2013   0us-gaap_SharesOutstanding
/ us-gaap_StatementEquityComponentsAxis
= us-gaap_PreferredStockMember		 71,859,000us-gaap_SharesOutstanding
/ us-gaap_StatementEquityComponentsAxis
= us-gaap_CommonStockMember		      
Net loss (38,755)us-gaap_NetIncomeLoss 0us-gaap_NetIncomeLoss
/ us-gaap_StatementEquityComponentsAxis
= us-gaap_PreferredStockMember		 0us-gaap_NetIncomeLoss
/ us-gaap_StatementEquityComponentsAxis
= us-gaap_CommonStockMember		 0us-gaap_NetIncomeLoss
/ us-gaap_StatementEquityComponentsAxis
= us-gaap_AdditionalPaidInCapitalMember		 0us-gaap_NetIncomeLoss
/ us-gaap_StatementEquityComponentsAxis
= us-gaap_AccumulatedOtherComprehensiveIncomeMember		 (38,755)us-gaap_NetIncomeLoss
/ us-gaap_StatementEquityComponentsAxis
= us-gaap_RetainedEarningsMember
Other comprehensive income (38)us-gaap_OtherComprehensiveIncomeLossNetOfTax 0us-gaap_OtherComprehensiveIncomeLossNetOfTax
/ us-gaap_StatementEquityComponentsAxis
= us-gaap_PreferredStockMember		 0us-gaap_OtherComprehensiveIncomeLossNetOfTax
/ us-gaap_StatementEquityComponentsAxis
= us-gaap_CommonStockMember		 0us-gaap_OtherComprehensiveIncomeLossNetOfTax
/ us-gaap_StatementEquityComponentsAxis
= us-gaap_AdditionalPaidInCapitalMember		 (38)us-gaap_OtherComprehensiveIncomeLossNetOfTax
/ us-gaap_StatementEquityComponentsAxis
= us-gaap_AccumulatedOtherComprehensiveIncomeMember		 0us-gaap_OtherComprehensiveIncomeLossNetOfTax
/ us-gaap_StatementEquityComponentsAxis
= us-gaap_RetainedEarningsMember
Issuance of common stock from public offering, net of expenses of $470 for 2014, $2733 for 2013 , and $550 for 2012 18,521us-gaap_StockIssuedDuringPeriodValueNewIssues 0us-gaap_StockIssuedDuringPeriodValueNewIssues
/ us-gaap_StatementEquityComponentsAxis
= us-gaap_PreferredStockMember		 4us-gaap_StockIssuedDuringPeriodValueNewIssues
/ us-gaap_StatementEquityComponentsAxis
= us-gaap_CommonStockMember		 18,517us-gaap_StockIssuedDuringPeriodValueNewIssues
/ us-gaap_StatementEquityComponentsAxis
= us-gaap_AdditionalPaidInCapitalMember		 0us-gaap_StockIssuedDuringPeriodValueNewIssues
/ us-gaap_StatementEquityComponentsAxis
= us-gaap_AccumulatedOtherComprehensiveIncomeMember		 0us-gaap_StockIssuedDuringPeriodValueNewIssues
/ us-gaap_StatementEquityComponentsAxis
= us-gaap_RetainedEarningsMember
Issuance of common stock from public offering, net of expenses of $470 for 2014, $2733 for 2013 , and $550 for 2012 (in shares)     4,341,000us-gaap_StockIssuedDuringPeriodSharesNewIssues
/ us-gaap_StatementEquityComponentsAxis
= us-gaap_CommonStockMember		      
Issuance of common stock from exercise of stock options and/or warrants, and purchases from ESPP(In Shares)     4,204,000cers_IssuanceOfCommonStockFromExerciseOfStockOptionsOrWarrantsAndPurchasesFromEmployeeStockPurchasePlansShares
/ us-gaap_StatementEquityComponentsAxis
= us-gaap_CommonStockMember		      
Issuance of common stock from exercise of stock options and/or warrants, and purchases from ESPP 13,845cers_IssuanceOfCommonStockFromExerciseOfStockOptionsOrWarrantsAndPurchasesFromEmployeeStockPurchasePlansValue 0cers_IssuanceOfCommonStockFromExerciseOfStockOptionsOrWarrantsAndPurchasesFromEmployeeStockPurchasePlansValue
/ us-gaap_StatementEquityComponentsAxis
= us-gaap_PreferredStockMember		 4cers_IssuanceOfCommonStockFromExerciseOfStockOptionsOrWarrantsAndPurchasesFromEmployeeStockPurchasePlansValue
/ us-gaap_StatementEquityComponentsAxis
= us-gaap_CommonStockMember		 13,841cers_IssuanceOfCommonStockFromExerciseOfStockOptionsOrWarrantsAndPurchasesFromEmployeeStockPurchasePlansValue
/ us-gaap_StatementEquityComponentsAxis
= us-gaap_AdditionalPaidInCapitalMember		 0cers_IssuanceOfCommonStockFromExerciseOfStockOptionsOrWarrantsAndPurchasesFromEmployeeStockPurchasePlansValue
/ us-gaap_StatementEquityComponentsAxis
= us-gaap_AccumulatedOtherComprehensiveIncomeMember		 0cers_IssuanceOfCommonStockFromExerciseOfStockOptionsOrWarrantsAndPurchasesFromEmployeeStockPurchasePlansValue
/ us-gaap_StatementEquityComponentsAxis
= us-gaap_RetainedEarningsMember
Stock-based compensation 5,153us-gaap_AdjustmentsToAdditionalPaidInCapitalSharebasedCompensationRequisiteServicePeriodRecognitionValue 0us-gaap_AdjustmentsToAdditionalPaidInCapitalSharebasedCompensationRequisiteServicePeriodRecognitionValue
/ us-gaap_StatementEquityComponentsAxis
= us-gaap_PreferredStockMember		 0us-gaap_AdjustmentsToAdditionalPaidInCapitalSharebasedCompensationRequisiteServicePeriodRecognitionValue
/ us-gaap_StatementEquityComponentsAxis
= us-gaap_CommonStockMember		 5,153us-gaap_AdjustmentsToAdditionalPaidInCapitalSharebasedCompensationRequisiteServicePeriodRecognitionValue
/ us-gaap_StatementEquityComponentsAxis
= us-gaap_AdditionalPaidInCapitalMember		 0us-gaap_AdjustmentsToAdditionalPaidInCapitalSharebasedCompensationRequisiteServicePeriodRecognitionValue
/ us-gaap_StatementEquityComponentsAxis
= us-gaap_AccumulatedOtherComprehensiveIncomeMember		 0us-gaap_AdjustmentsToAdditionalPaidInCapitalSharebasedCompensationRequisiteServicePeriodRecognitionValue
/ us-gaap_StatementEquityComponentsAxis
= us-gaap_RetainedEarningsMember
Ending Balance at Dec. 31, 2014 $ 41,521us-gaap_StockholdersEquity $ 0us-gaap_StockholdersEquity
/ us-gaap_StatementEquityComponentsAxis
= us-gaap_PreferredStockMember		 $ 80us-gaap_StockholdersEquity
/ us-gaap_StatementEquityComponentsAxis
= us-gaap_CommonStockMember		 $ 583,416us-gaap_StockholdersEquity
/ us-gaap_StatementEquityComponentsAxis
= us-gaap_AdditionalPaidInCapitalMember		 $ (31)us-gaap_StockholdersEquity
/ us-gaap_StatementEquityComponentsAxis
= us-gaap_AccumulatedOtherComprehensiveIncomeMember		 $ (541,944)us-gaap_StockholdersEquity
/ us-gaap_StatementEquityComponentsAxis
= us-gaap_RetainedEarningsMember
Ending Balance (in shares) at Dec. 31, 2014   0us-gaap_SharesOutstanding
/ us-gaap_StatementEquityComponentsAxis
= us-gaap_PreferredStockMember		 80,404,000us-gaap_SharesOutstanding
/ us-gaap_StatementEquityComponentsAxis
= us-gaap_CommonStockMember