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Long-Term Investments - Additional Information (Detail) (USD $) | 12 Months Ended
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Dec. 31, 2014 | Dec. 31, 2013 | Dec. 31, 2012
Investment [Line Items] |  |  |
Eligibility to receive a royalty fee | 1.00%cers_EligibleToReceiveRoyaltyFee |  |
Royalty income, nonoperating | $ 0 us-gaap_InvestmentIncomeNonoperating | $ 0 us-gaap_InvestmentIncomeNonoperating | $ 0 us-gaap_InvestmentIncomeNonoperating
Carrying value of investment | $ 0 us-gaap_CostMethodInvestments |  |
Maximum |  |  |
Investment [Line Items] |  |  |
Ownership percentage under Cost Method for Investments | 1.00%cers_OwnershipPercentageUnderCostMethodInvestments / us-gaap_RangeAxis = us-gaap_MaximumMember |  |

X
- Definition Eligible to receive a royalty fee. + References No definition available. + Details
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- Definition Ownership percentage of investee's common stock using the cost method. + References No definition available. + Details
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- Details
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- Definition Amount, after adjustment, of cost-method investment. Adjustments include, but are not limited to, dividends received in excess of earnings after date of investment that are considered a return of investment and other than temporary impairments. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02.12) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 325 -SubTopic 20 -Section 50 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=6872867&loc=d3e40691-111596 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 325 -SubTopic 20 -Section 35 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=29638308&loc=d3e40346-111594 + Details
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- Definition The aggregate amount of income from investments (for example, dividends) not considered a component of the entity's core operations. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 225 -SubTopic 10 -Section S99 -Paragraph 2 -Subparagraph (SX 210.5-03.7) -URI http://asc.fasb.org/extlink&oid=26872669&loc=d3e20235-122688 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 03 -Paragraph 7 -Article 5 + Details
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