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Summary of Significant Accounting Policies - Additional Information (Detail) (USD $) Share data in Millions, unless otherwise specified	3 Months Ended		12 Months Ended
	Mar. 31, 2015 Segment Customer	Mar. 31, 2014	Dec. 31, 2014	Aug. 31, 2009	Nov. 30, 2010
Summary Of Significant Accounting Policies [Line Items]
Number of major customers representing outstanding trade receivables	1cers_CumulativeOutstandingTradeReceivablesNumberOfMajorCustomers		1cers_CumulativeOutstandingTradeReceivablesNumberOfMajorCustomers
Life of inventory	2 years
Protracted length of inventory	1 year
Inventory valuation reserves	$ 100,000us-gaap_InventoryValuationReserves		100,000us-gaap_InventoryValuationReserves
Capitalized costs for enhancement of enterprise resource planning software system and other internal use software	0us-gaap_CapitalizedComputerSoftwareNet
Estimated useful life of intangible assets	10 years
Number of reportable segments	1us-gaap_NumberOfReportableSegments
Impairment charges on long-lived assets	0us-gaap_ImpairmentOfLongLivedAssetsHeldForUse	0us-gaap_ImpairmentOfLongLivedAssetsHeldForUse
Period of warranty	1 year
Warranty claim liability	0us-gaap_ProductWarrantyAccrualClassifiedCurrent		0us-gaap_ProductWarrantyAccrualClassifiedCurrent
Computer Software, Intangible Asset
Summary Of Significant Accounting Policies [Line Items]
Enterprise resource planning system, estimated useful life	5 years
2009 Unit Offering
Summary Of Significant Accounting Policies [Line Items]
Warrants to purchase an aggregate shares of common stock				2.4us-gaap_ClassOfWarrantOrRightNumberOfSecuritiesCalledByWarrantsOrRights / us-gaap_ClassOfWarrantOrRightAxis = cers_TwoThousandNineUnitOfferingMember
2010 Unit Offering
Summary Of Significant Accounting Policies [Line Items]
Warrants to purchase an aggregate shares of common stock					3.7us-gaap_ClassOfWarrantOrRightNumberOfSecuritiesCalledByWarrantsOrRights / us-gaap_ClassOfWarrantOrRightAxis = cers_TwoThousandTenUnitOfferingMember
Other income, net
Summary Of Significant Accounting Policies [Line Items]
Reclassified amortization of premium from purchase of fixed income securities	$ 100,000us-gaap_PriorPeriodReclassificationAdjustment / us-gaap_IncomeStatementLocationAxis = us-gaap_OtherIncomeMember
Trade Accounts Receivable | Customer Concentration Risk
Summary Of Significant Accounting Policies [Line Items]
Cumulative outstanding trade receivables percentage by major customers	27.00%us-gaap_ConcentrationRiskPercentage1 / us-gaap_ConcentrationRiskByBenchmarkAxis = us-gaap_AccountsReceivableMember / us-gaap_ConcentrationRiskByTypeAxis = us-gaap_CustomerConcentrationRiskMember		36.00%us-gaap_ConcentrationRiskPercentage1 / us-gaap_ConcentrationRiskByBenchmarkAxis = us-gaap_AccountsReceivableMember / us-gaap_ConcentrationRiskByTypeAxis = us-gaap_CustomerConcentrationRiskMember
Minimum
Summary Of Significant Accounting Policies [Line Items]
Estimated useful life of property and equipment	3 years
Maximum
Summary Of Significant Accounting Policies [Line Items]
Estimated useful life of property and equipment	5 years

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Number of customers whose outstanding trade receivables by a single customer accounts for 10 percent or more of an entity's trade receivable.

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Carrying value as of the balance sheet date of obligations incurred through that date and payable for estimated claims under standard and extended warranty protection rights granted to customers. For classified balance sheets, represents the current portion of the liabilities (due within one year or within the normal operating cycle if longer).

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