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Commitments and Contingencies (Details) (USD $) In Millions, unless otherwise specified | 1 Months Ended | 6 Months Ended
--- | --- | ---
Dec. 31, 2010 | Jun. 30, 2012
Commitments and Contingencies (Additional Textual) [Abstract] |  |
Minimum term of non-cancelable operating leases |  | 1 year
Expiration of non-cancelable operating leases maximum year |  | 2019
Financing for leasehold improvement | $ 1.1 |
Outstanding liability related to leasehold improvements |  | 0.9
Leasehold Improvement reflected to Accrued liabilities |  | 0.1
Leasehold Improvement reflected in Other non-current liabilities |  | $ 0.8
Concord Lease [Member] |  |
Commitments and Contingencies (Textual) [Abstract] |  |
Early termination of non cancelable operating leases minimum period |  | 2015-01

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- Details
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- Details
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- Definition Earliest period for early termination of non-cancelable operating lease. + References No definition available. + Details
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- Definition Latest period of expiration of non-cancelable operating lease. + References No definition available. + Details
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Balance Type: | na
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- Definition Portion of outstanding liability related to leasehold improvement reflected in accrued liabilities. + References No definition available. + Details
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- Definition Portion of outstanding liability related to leasehold improvement reflected in other non current liabilities. + References No definition available. + Details
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Data Type: | xbrli:monetaryItemType
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- Definition Minimum term of non-cancelable operating lease. + References No definition available. + Details
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- Definition Outstanding liability related to leasehold improvements current and non current. + 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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- Definition Proceeds from landlord for financing leasehold improvement. + References No definition available. + Details
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Namespace Prefix: | cers_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration