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Commitments and Contingencies - Additional Information (Detail) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2016
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, rent expense	$ 1.0	$ 1.0	$ 0.8
Purchase commitment, paid	10.0	$ 6.7	$ 6.9
Future minimum purchase commitment 2019	13.1
Future minimum purchase commitment 2020	3.2
Future minimum purchase commitment 2021	2.5
Future minimum purchase commitment 2022	2.6
Future minimum purchase commitment 2023	$ 0.1

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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Namespace Prefix:	cers_
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X

- Definition

Purchase commitment payments.

+ References

No definition available.

+ Details

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Namespace Prefix:	cers_
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Balance Type:	credit
Period Type:	duration

X

- References

No definition available.

+ Details

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X

- Definition

Rental expense for the reporting period incurred under operating leases, including minimum and any contingent rent expense, net of related sublease income.

+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 840
-SubTopic 20
-Section 50
-Paragraph 1
-URI http://asc.fasb.org/extlink&oid=77902758&loc=d3e41499-112717

+ Details

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X

- Definition

Minimum amount of purchase arrangement maturing in the fifth fiscal year following the latest fiscal year. Includes, but not limited to, recorded and unrecorded purchase obligations, long-term purchase commitments, and short-term purchase commitments.

+ References

No definition available.

+ Details

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Namespace Prefix:	us-gaap_
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X

- Definition

Minimum amount of purchase arrangement maturing in the fourth fiscal year following the latest fiscal year. Includes, but not limited to, recorded and unrecorded purchase obligations, long-term purchase commitments, and short-term purchase commitments.

+ References

No definition available.

+ Details

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X

- Definition

Minimum amount of purchase arrangement maturing in the next fiscal year following the latest fiscal year. Includes, but not limited to, recorded and unrecorded purchase obligations, long-term purchase commitments, and short-term purchase commitments.

+ References

No definition available.

+ Details

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X

- Definition

Minimum amount of purchase arrangement maturing in the second fiscal year following the latest fiscal year. Includes, but not limited to, recorded and unrecorded purchase obligations, long-term purchase commitments, and short-term purchase commitments.

+ References

No definition available.

+ Details

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X

- Definition

Minimum amount of purchase arrangement maturing in the third fiscal year following the latest fiscal year. Includes, but not limited to, recorded and unrecorded purchase obligations, long-term purchase commitments, and short-term purchase commitments.

+ References

No definition available.

+ Details

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