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Commitments and Contingencies - Additional Information (Detail) (USD $) | 12 Months Ended
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Dec. 31, 2013 | Dec. 31, 2012 | Dec. 31, 2011 | Dec. 31, 2010
Commitments and Contingencies Disclosure [Line Items] |  |  |  |
Minimum term of non-cancellable operating leases | 1 year |  |  |
Expiration of non-cancellable operating leases maximum year | 2019 |  |  |
Future rent payment, 2014 | $ 1,147,000 |  |  |
Future rent payment, 2015 | 553,000 |  |  |
Operating lease, rent expense | 700,000 | 600,000 | 700,000 |
Financing for leasehold improvement |  |  |  | 1,100,000
Outstanding liability related to leasehold improvements | 700,000 |  |  |
Leasehold Improvements reflected in Accrued liabilities | 100,000 |  |  |
Leasehold Improvements reflected in Other non-current liabilities | 600,000 |  |  |
Purchase commitment, paid | 6,500,000 | 7,200,000 | 3,600,000 |
Future minimum purchase commitment 2014 | 3,400,000 |  |  |
Future minimum purchase commitment 2015 | 1,300,000 |  |  |
Future minimum purchase commitment 2016 | 1,300,000 |  |  |
Additional Concord Lease |  |  |  |
Commitments and Contingencies Disclosure [Line Items] |  |  |  |
Early termination of non-cancellable operating leases minimum period | 2015-01 |  |  |
Initial term of operating lease | 2 years |  |  |
Number of renewal options | 4 |  |  |
Renewal period of operating lease | 2 years |  |  |
Lease commencement date | Aug. 01, 2013 |  |  |
Future rent payment, 2014 | 154,368 |  |  |
Future rent payment, 2015 | $ 90,048 |  |  |

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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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- Definition Portion of outstanding liability related to leasehold improvement reflected in accrued liabilities. + References No definition available. + Details
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Balance Type: | credit
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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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- Definition Long Term Purchase Commitment Amount Due Within One Year + References No definition available. + Details
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- Definition Long Term Purchase Commitment Amount Due Within Three Years + References No definition available. + Details
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- Definition Long Term Purchase Commitment Amount Due Within Two Years + References No definition available. + Details
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- Definition Minimum term of non-cancelable operating lease. + References No definition available. + Details
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- Definition Operating Lease Number Of Additional Renewal Option + References No definition available. + Details
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- Definition Operating Leases Start Date + 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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- Definition Proceeds from landlord for financing leasehold improvement. + References No definition available. + Details
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Data Type: | xbrli:monetaryItemType
Balance Type: | debit
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- Definition Purchase Commitment Payments + References No definition available. + Details
Name: | cers_PurchaseCommitmentPayments
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- Definition Term of the lessee's leasing arrangement renewal, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days. + References No definition available. + Details
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- Definition Term of the lessee's leasing arrangement, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days. + References No definition available. + Details
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- Definition Amount of required minimum rental payments maturing in the next fiscal year following the latest fiscal year for operating leases having an initial or remaining non-cancelable letter-terms in excess of one year. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 840 -SubTopic 10 -Section 55 -Paragraph 40 -Subparagraph (Note 3) -URI http://asc.fasb.org/extlink&oid=6584154&loc=d3e38371-112697 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 840 -SubTopic 20 -Section 50 -Paragraph 2 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=6453985&loc=d3e41502-112717 + Details
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- Definition Amount of required minimum rental payments maturing in the second fiscal year following the latest fiscal year for operating leases having an initial or remaining non-cancelable letter-terms in excess of one year. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 840 -SubTopic 10 -Section 55 -Paragraph 40 -Subparagraph (Note 3) -URI http://asc.fasb.org/extlink&oid=6584154&loc=d3e38371-112697 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 840 -SubTopic 20 -Section 50 -Paragraph 2 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=6453985&loc=d3e41502-112717 + Details
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- Definition This element represents the payments that the lessee is obligated to make or can be required to make in connection with a property under the terms of an agreement classified as an operating lease, excluding contingent rentals and a guarantee by the lessee of the lessor's debt and the lessee's obligation to pay (apart from the rental payments) executory costs such as insurance, maintenance, and taxes. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 840 -SubTopic 20 -Section 50 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=6453985&loc=d3e41499-112717 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 840 -SubTopic 10 -Section 55 -Paragraph 40 -Subparagraph (Note 3) -URI http://asc.fasb.org/extlink&oid=6584154&loc=d3e38371-112697 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 840 -SubTopic 10 -Section 25 -Paragraph 5 -URI http://asc.fasb.org/extlink&oid=7661868&loc=d3e34039-112682 + Details
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