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Commitments and Contingencies - Additional Information (Detail) - USD ($) $ in Millions | 12 Months Ended
--- | ---
Dec. 31, 2022 | Dec. 31, 2021 | Dec. 31, 2020
Commitments and Contingencies Disclosure [Abstract] |  |  |
Minimum term of non-cancellable operating leases | 1 year |  |
Expiration of non-cancellable operating leases maximum year | 2030 |  |
Operating lease expenses | $ 3.2 | $ 3.2 | $ 3.3
Operating lease not yet commenced | the Company had no leases that have not yet commenced. |  |
Short-term purchase commitments | $ 34.3 |  |
Long-term purchase commitments | $ 14.2 |  |

X
- Definition Latest period of expiration of non-cancelable operating lease. + References No definition available. + Details
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X
- Definition Minimum term of non-cancelable operating lease. + References No definition available. + Details
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Balance Type: | na
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X
- Definition Short-term purchase commitment amount. + References No definition available. + Details
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Namespace Prefix: | cers_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

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- References No definition available. + Details
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- Definition Description of lessor's operating lease that has not yet commenced. + References Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef -Publisher FASB -Name Accounting Standards Codification -Topic 842 -SubTopic 30 -Section 50 -Paragraph 3 -Subparagraph (a)(1) -URI https://asc.fasb.org/extlink&oid=124258985&loc=SL77919359-209981 + Details
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- Definition The minimum amount the entity agreed to spend under the long-term purchase commitment. + References No definition available. + Details
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- Definition Amount of single lease cost, calculated by allocation of remaining cost of lease over remaining lease term. Includes, but is not limited to, single lease cost, after impairment of right-of-use asset, calculated by amortization of remaining right-of-use asset and accretion of lease liability. + References Reference 1: http://www.xbrl.org/2003/role/exampleRef -Publisher FASB -Name Accounting Standards Codification -Topic 842 -SubTopic 20 -Section 55 -Paragraph 53 -URI https://asc.fasb.org/extlink&oid=123414884&loc=SL77918982-209971 Reference 2: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 842 -SubTopic 20 -Section 50 -Paragraph 4 -Subparagraph (b) -URI https://asc.fasb.org/extlink&oid=128292326&loc=SL77918686-209980 + Details
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Balance Type: | debit
Period Type: | duration