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Fair Value of Warrants Outstanding (Detail) (USD $)
Dec. 31, 2014
Dec. 31, 2013
Class of Warrant or Right [Line Items]    
Warrant liability $ 10,485,000us-gaap_WarrantsAndRightsOutstanding $ 20,390,000us-gaap_WarrantsAndRightsOutstanding
2009 Warrants    
Class of Warrant or Right [Line Items]    
Warrant liability   8,542,000us-gaap_WarrantsAndRightsOutstanding
/ us-gaap_ClassOfWarrantOrRightAxis
= cers_TwoThousandNineWarrantsMember
2010 Warrants    
Class of Warrant or Right [Line Items]    
Warrant liability $ 10,485,000us-gaap_WarrantsAndRightsOutstanding
/ us-gaap_ClassOfWarrantOrRightAxis
= cers_TwoThousandTenWarrantsMember		 $ 11,848,000us-gaap_WarrantsAndRightsOutstanding
/ us-gaap_ClassOfWarrantOrRightAxis
= cers_TwoThousandTenWarrantsMember