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Segment, Customer and Geographic Information - Long Lived Assets by Geographical Location (Detail) - USD ($) $ in Thousands | Dec. 31, 2019 | Dec. 31, 2018
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Long-Lived Assets by Geographical Areas [Line Items] |  |
Total long-lived assets | $ 15,030 | $ 8,464
U.S. and Territories |  |
Long-Lived Assets by Geographical Areas [Line Items] |  |
Total long-lived assets | 14,619 | 8,252
Europe and Other |  |
Long-Lived Assets by Geographical Areas [Line Items] |  |
Total long-lived assets | $ 411 | $ 212

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- Definition Long-lived assets by geographical areas. + References No definition available. + Details
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Namespace Prefix: | cers_
Data Type: | xbrli:stringItemType
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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://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 280 -SubTopic 10 -Section 50 -Paragraph 41 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=115929826&loc=d3e9038-108599 + Details
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Balance Type: | debit
Period Type: | instant

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- Details
Name: | srt_StatementGeographicalAxis=country_US
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

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- Details
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Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |