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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 | 1 cers_CumulativeOutstandingTradeReceivablesNumberOfMajorCustomers |  | 1 cers_CumulativeOutstandingTradeReceivablesNumberOfMajorCustomers |  |
Life of inventory | 2 years |  |  |  |
Protracted length of inventory | 1 year |  |  |  |
Inventory valuation reserves | $ 100,000 us-gaap_InventoryValuationReserves |  | 100,000 us-gaap_InventoryValuationReserves |  |
Capitalized costs for enhancement of enterprise resource planning software system and other internal use software | 0 us-gaap_CapitalizedComputerSoftwareNet |  |  |  |
Estimated useful life of intangible assets | 10 years |  |  |  |
Number of reportable segments | 1 us-gaap_NumberOfReportableSegments |  |  |  |
Impairment charges on long-lived assets | 0 us-gaap_ImpairmentOfLongLivedAssetsHeldForUse | 0 us-gaap_ImpairmentOfLongLivedAssetsHeldForUse |  |  |
Period of warranty | 1 year |  |  |  |
Warranty claim liability | 0 us-gaap_ProductWarrantyAccrualClassifiedCurrent |  | 0 us-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 |  |  |  | 2.4 us-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 |  |  |  |  | 3.7 us-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 | $ 100,000 us-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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