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Long Lived Assets by Geographical Location (Detail) (USD $) In Thousands, unless otherwise specified | Dec. 31, 2014 | Dec. 31, 2013
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Long-Lived Assets by Geographical Areas [Line Items] |  |
Total long-lived assets | $ 4,923 us-gaap_NoncurrentAssets | $ 3,533 us-gaap_NoncurrentAssets
UNITED STATES |  |
Long-Lived Assets by Geographical Areas [Line Items] |  |
Total long-lived assets | 4,624 us-gaap_NoncurrentAssets / us-gaap_StatementGeographicalAxis = country_US | 3,088 us-gaap_NoncurrentAssets / us-gaap_StatementGeographicalAxis = country_US
Europe And Other |  |
Long-Lived Assets by Geographical Areas [Line Items] |  |
Total long-lived assets | $ 299 us-gaap_NoncurrentAssets / us-gaap_StatementGeographicalAxis = cers_EuropeAndOtherMember | $ 445 us-gaap_NoncurrentAssets / us-gaap_StatementGeographicalAxis = cers_EuropeAndOtherMember

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- Definition Long-lived assets other than financial instruments, long-term customer relationships of a financial institution, mortgage and other servicing rights, deferred policy acquisition costs, and deferred tax assets. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 280 -SubTopic 10 -Section 50 -Paragraph 41 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=6534315&loc=d3e9038-108599 + Details
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