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Significant Customer that Accounted for More than Ten Percentage of Total Revenue (Detail) - Customer Concentration Risk - Sales Revenue, Goods, Net	3 Months Ended
	Mar. 31, 2016		Mar. 31, 2015
Advanced Technology Company KSC
Revenue, Major Customer [Line Items]
Concentration risk, percentage	18.00%			[1]
Etablissement Francais du Sang
Revenue, Major Customer [Line Items]
Concentration risk, percentage		[1]	26.00%
Medical Device APS
Revenue, Major Customer [Line Items]
Concentration risk, percentage	11.00%			[1]
Rode Kruis Vlaanderen
Revenue, Major Customer [Line Items]
Concentration risk, percentage	12.00%			[1]
[1] Represents an amount less than 10% of product revenue.

X

- Definition

For an entity that discloses a concentration risk in relation to quantitative amount, which serves as the "benchmark" (or denominator) in the equation, this concept represents the concentration percentage derived from the division.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 275
-SubTopic 10
-Section 50
-Paragraph 18
-URI http://asc.fasb.org/extlink&oid=51801978&loc=d3e6351-108592

Reference 2: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 825
-SubTopic 10
-Section 50
-Paragraph 20
-URI http://asc.fasb.org/extlink&oid=49121117&loc=d3e13531-108611

Reference 3: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 275
-SubTopic 10
-Section 50
-Paragraph 20
-URI http://asc.fasb.org/extlink&oid=51801978&loc=d3e6404-108592

Reference 4: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 825
-SubTopic 10
-Section 50
-Paragraph 21
-Subparagraph (a)
-URI http://asc.fasb.org/extlink&oid=49121117&loc=d3e13537-108611

+ Details

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Namespace Prefix:	us-gaap_
Data Type:	num:percentItemType
Balance Type:	na
Period Type:	duration

X

- Definition

Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table.

+ References

No definition available.

+ Details

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Balance Type:	na
Period Type:	duration

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- Details

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X

- Details

Name:	us-gaap_ConcentrationRiskByBenchmarkAxis=us-gaap_SalesRevenueGoodsNetMember
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X

- Details

Name:	us-gaap_MajorCustomersAxis=cers_AdvancedTechnologyCompKscMember
Namespace Prefix:
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X

- Details

Name:	us-gaap_MajorCustomersAxis=cers_EtablissementFrancaisDuSangMember
Namespace Prefix:
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X

- Details

Name:	us-gaap_MajorCustomersAxis=cers_MedicalDeviceMember
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X

- Details

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