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Goodwill and Intangible Assets Net - Additional Information (Detail) (USD $)
 12 Months Ended
Dec. 31, 2014
Dec. 31, 2013
Dec. 31, 2012
Acquired Finite-Lived Intangible Assets [Line Items]      
Dispose, impair or recognition of additional goodwill $ 0us-gaap_GoodwillOtherChanges    
Impairment charges on goodwill 0us-gaap_GoodwillImpairmentLoss    
Impairment losses recognized related to the acquired intangible assets 0us-gaap_ImpairmentOfIntangibleAssetsFinitelived 0us-gaap_ImpairmentOfIntangibleAssetsFinitelived 0us-gaap_ImpairmentOfIntangibleAssetsFinitelived
Annual amortization expense of the intangible assets, 2015 200,000us-gaap_FiniteLivedIntangibleAssetsAmortizationExpenseNextTwelveMonths    
Annual amortization expense of the intangible assets, 2016 200,000us-gaap_FiniteLivedIntangibleAssetsAmortizationExpenseYearTwo    
Annual amortization expense of the intangible assets, 2017 200,000us-gaap_FiniteLivedIntangibleAssetsAmortizationExpenseYearThree    
Annual amortization expense of the intangible assets, 2018 200,000us-gaap_FiniteLivedIntangibleAssetsAmortizationExpenseYearFour    
Annual amortization expense of the intangible assets, 2019 200,000us-gaap_FiniteLivedIntangibleAssetsAmortizationExpenseYearFive    
Annual amortization expense of the intangible assets, 2020 $ 100,000cers_FiniteLivedIntangibleAssetsAmortizationExpenseYearSix