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Goodwill and Intangible Assets Net - Additional Information (Detail) (USD $)
 3 Months Ended
Mar. 31, 2015
Mar. 31, 2014
Acquired Finite-Lived Intangible Assets [Line Items]    
Dispose, impair or recognition of additional goodwill $ 0us-gaap_GoodwillOtherChanges  
Impairment charges on goodwill 0us-gaap_GoodwillImpairmentLoss  
Amortization of intangible assets 50,000us-gaap_AmortizationOfIntangibleAssets 50,000us-gaap_AmortizationOfIntangibleAssets
Impairment losses recognized related to the acquired intangible assets 0us-gaap_ImpairmentOfIntangibleAssetsFinitelived 0us-gaap_ImpairmentOfIntangibleAssetsFinitelived
Annual amortization expense of the intangible assets, 2015 (remaining nine months) 150,000us-gaap_FiniteLivedIntangibleAssetsAmortizationExpenseRemainderOfFiscalYear  
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