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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 | $ 9,587 us-gaap_SalesRevenueGoodsNet | $ 10,362 us-gaap_SalesRevenueGoodsNet | $ 8,601 us-gaap_SalesRevenueGoodsNet | $ 7,866 us-gaap_SalesRevenueGoodsNet | $ 9,232 us-gaap_SalesRevenueGoodsNet | $ 10,542 us-gaap_SalesRevenueGoodsNet | $ 10,150 us-gaap_SalesRevenueGoodsNet | $ 9,733 us-gaap_SalesRevenueGoodsNet | $ 36,416 us-gaap_SalesRevenueGoodsNet | $ 39,657 us-gaap_SalesRevenueGoodsNet | $ 36,695 us-gaap_SalesRevenueGoodsNet
Government grants and cooperative agreements |  |  |  |  |  |  |  |  | 0 us-gaap_RevenueFromGrants | 0 us-gaap_RevenueFromGrants | 91 us-gaap_RevenueFromGrants
Total revenue |  |  |  |  |  |  |  |  | 36,416 us-gaap_Revenues | 39,657 us-gaap_Revenues | 36,786 us-gaap_Revenues
FRANCE |  |  |  |  |  |  |  |  |  |  |
Revenue, Major Customer [Line Items] |  |  |  |  |  |  |  |  |  |  |
Product revenue |  |  |  |  |  |  |  |  | 9,184 us-gaap_SalesRevenueGoodsNet / us-gaap_StatementGeographicalAxis = country_FR | 7,030 us-gaap_SalesRevenueGoodsNet / us-gaap_StatementGeographicalAxis = country_FR | 7,321 us-gaap_SalesRevenueGoodsNet / us-gaap_StatementGeographicalAxis = country_FR
SPAIN |  |  |  |  |  |  |  |  |  |  |
Revenue, Major Customer [Line Items] |  |  |  |  |  |  |  |  |  |  |
Product revenue |  |  |  |  |  |  |  |  | 2,776 us-gaap_SalesRevenueGoodsNet / us-gaap_StatementGeographicalAxis = country_ES | 7,033 us-gaap_SalesRevenueGoodsNet / us-gaap_StatementGeographicalAxis = country_ES | 7,061 us-gaap_SalesRevenueGoodsNet / us-gaap_StatementGeographicalAxis = country_ES
CIS |  |  |  |  |  |  |  |  |  |  |
Revenue, Major Customer [Line Items] |  |  |  |  |  |  |  |  |  |  |
Product revenue |  |  |  |  |  |  |  |  | 6,636 us-gaap_SalesRevenueGoodsNet / us-gaap_StatementGeographicalAxis = cers_CommonwealthOfIndependentStatesCountriesMember | 8,220 us-gaap_SalesRevenueGoodsNet / us-gaap_StatementGeographicalAxis = cers_CommonwealthOfIndependentStatesCountriesMember | 8,016 us-gaap_SalesRevenueGoodsNet / us-gaap_StatementGeographicalAxis = cers_CommonwealthOfIndependentStatesCountriesMember
BELGIUM |  |  |  |  |  |  |  |  |  |  |
Revenue, Major Customer [Line Items] |  |  |  |  |  |  |  |  |  |  |
Product revenue |  |  |  |  |  |  |  |  | 4,456 us-gaap_SalesRevenueGoodsNet / us-gaap_StatementGeographicalAxis = country_BE | 3,971 us-gaap_SalesRevenueGoodsNet / us-gaap_StatementGeographicalAxis = country_BE | 4,016 us-gaap_SalesRevenueGoodsNet / us-gaap_StatementGeographicalAxis = country_BE
SWITZERLAND |  |  |  |  |  |  |  |  |  |  |
Revenue, Major Customer [Line Items] |  |  |  |  |  |  |  |  |  |  |
Product revenue |  |  |  |  |  |  |  |  | 3,784 us-gaap_SalesRevenueGoodsNet / us-gaap_StatementGeographicalAxis = country_CH | 4,078 us-gaap_SalesRevenueGoodsNet / us-gaap_StatementGeographicalAxis = country_CH | 3,866 us-gaap_SalesRevenueGoodsNet / us-gaap_StatementGeographicalAxis = country_CH
Other Countries |  |  |  |  |  |  |  |  |  |  |
Revenue, Major Customer [Line Items] |  |  |  |  |  |  |  |  |  |  |
Product revenue |  |  |  |  |  |  |  |  | 9,580 us-gaap_SalesRevenueGoodsNet / us-gaap_StatementGeographicalAxis = cers_OtherCountriesMember | 9,325 us-gaap_SalesRevenueGoodsNet / us-gaap_StatementGeographicalAxis = cers_OtherCountriesMember | 6,415 us-gaap_SalesRevenueGoodsNet / us-gaap_StatementGeographicalAxis = cers_OtherCountriesMember
UNITED STATES |  |  |  |  |  |  |  |  |  |  |
Revenue, Major Customer [Line Items] |  |  |  |  |  |  |  |  |  |  |
Government grants and cooperative agreements |  |  |  |  |  |  |  |  | $ 0 us-gaap_RevenueFromGrants / us-gaap_StatementGeographicalAxis = country_US | $ 0 us-gaap_RevenueFromGrants / us-gaap_StatementGeographicalAxis = country_US | $ 91 us-gaap_RevenueFromGrants / us-gaap_StatementGeographicalAxis = country_US

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