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Revenue by Geographical Location (Detail) (USD $) In Thousands, unless otherwise specified	3 Months Ended								12 Months Ended
	Dec. 31, 2014	Sep. 30, 2014	Jun. 30, 2014	Mar. 31, 2014	Dec. 31, 2013	Sep. 30, 2013	Jun. 30, 2013	Mar. 31, 2013	Dec. 31, 2014	Dec. 31, 2013	Dec. 31, 2012
Revenue, Major Customer [Line Items]
Product revenue	$ 9,587us-gaap_SalesRevenueGoodsNet	$ 10,362us-gaap_SalesRevenueGoodsNet	$ 8,601us-gaap_SalesRevenueGoodsNet	$ 7,866us-gaap_SalesRevenueGoodsNet	$ 9,232us-gaap_SalesRevenueGoodsNet	$ 10,542us-gaap_SalesRevenueGoodsNet	$ 10,150us-gaap_SalesRevenueGoodsNet	$ 9,733us-gaap_SalesRevenueGoodsNet	$ 36,416us-gaap_SalesRevenueGoodsNet	$ 39,657us-gaap_SalesRevenueGoodsNet	$ 36,695us-gaap_SalesRevenueGoodsNet
Government grants and cooperative agreements									0us-gaap_RevenueFromGrants	0us-gaap_RevenueFromGrants	91us-gaap_RevenueFromGrants
Total revenue									36,416us-gaap_Revenues	39,657us-gaap_Revenues	36,786us-gaap_Revenues
FRANCE
Revenue, Major Customer [Line Items]
Product revenue									9,184us-gaap_SalesRevenueGoodsNet / us-gaap_StatementGeographicalAxis = country_FR	7,030us-gaap_SalesRevenueGoodsNet / us-gaap_StatementGeographicalAxis = country_FR	7,321us-gaap_SalesRevenueGoodsNet / us-gaap_StatementGeographicalAxis = country_FR
SPAIN
Revenue, Major Customer [Line Items]
Product revenue									2,776us-gaap_SalesRevenueGoodsNet / us-gaap_StatementGeographicalAxis = country_ES	7,033us-gaap_SalesRevenueGoodsNet / us-gaap_StatementGeographicalAxis = country_ES	7,061us-gaap_SalesRevenueGoodsNet / us-gaap_StatementGeographicalAxis = country_ES
CIS
Revenue, Major Customer [Line Items]
Product revenue									6,636us-gaap_SalesRevenueGoodsNet / us-gaap_StatementGeographicalAxis = cers_CommonwealthOfIndependentStatesCountriesMember	8,220us-gaap_SalesRevenueGoodsNet / us-gaap_StatementGeographicalAxis = cers_CommonwealthOfIndependentStatesCountriesMember	8,016us-gaap_SalesRevenueGoodsNet / us-gaap_StatementGeographicalAxis = cers_CommonwealthOfIndependentStatesCountriesMember
BELGIUM
Revenue, Major Customer [Line Items]
Product revenue									4,456us-gaap_SalesRevenueGoodsNet / us-gaap_StatementGeographicalAxis = country_BE	3,971us-gaap_SalesRevenueGoodsNet / us-gaap_StatementGeographicalAxis = country_BE	4,016us-gaap_SalesRevenueGoodsNet / us-gaap_StatementGeographicalAxis = country_BE
SWITZERLAND
Revenue, Major Customer [Line Items]
Product revenue									3,784us-gaap_SalesRevenueGoodsNet / us-gaap_StatementGeographicalAxis = country_CH	4,078us-gaap_SalesRevenueGoodsNet / us-gaap_StatementGeographicalAxis = country_CH	3,866us-gaap_SalesRevenueGoodsNet / us-gaap_StatementGeographicalAxis = country_CH
Other Countries
Revenue, Major Customer [Line Items]
Product revenue									9,580us-gaap_SalesRevenueGoodsNet / us-gaap_StatementGeographicalAxis = cers_OtherCountriesMember	9,325us-gaap_SalesRevenueGoodsNet / us-gaap_StatementGeographicalAxis = cers_OtherCountriesMember	6,415us-gaap_SalesRevenueGoodsNet / us-gaap_StatementGeographicalAxis = cers_OtherCountriesMember
UNITED STATES
Revenue, Major Customer [Line Items]
Government grants and cooperative agreements									$ 0us-gaap_RevenueFromGrants / us-gaap_StatementGeographicalAxis = country_US	$ 0us-gaap_RevenueFromGrants / us-gaap_StatementGeographicalAxis = country_US	$ 91us-gaap_RevenueFromGrants / us-gaap_StatementGeographicalAxis = country_US

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Revenue earned during the period from non-repayable sum of money awarded to an entity to carry out a specific purpose as provided in grant agreements.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 225

-SubTopic 10

-Section S99

-Paragraph 2

-Subparagraph (SX 210.5-03.1(e))

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Amount of revenue recognized from goods sold, services rendered, insurance premiums, or other activities that constitute an earning process. Includes, but is not limited to, investment and interest income before deduction of interest expense when recognized as a component of revenue, and sales and trading gain (loss).

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 225

-SubTopic 10

-Section S99

-Paragraph 2

-Subparagraph (SX 210.5-03.1)

-URI http://asc.fasb.org/extlink&oid=26872669&loc=d3e20235-122688



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+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 225

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