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Accrued Expenses - Schedule of Accrued Expenses (Detail) (USD $)
In Thousands, unless otherwise specified
Dec. 31, 2014
Dec. 31, 2013
Payables And Accruals [Abstract]    
Accrued expenses $ 663ceru_AccruedExpensesCurrent $ 379ceru_AccruedExpensesCurrent
Accrued clinical trial costs 848ceru_AccruedClinicalTrialCostsCurrent 610ceru_AccruedClinicalTrialCostsCurrent
Accrued contract manufacturing expenses 580ceru_AccruedManufacturingExpensesCurrent 433ceru_AccruedManufacturingExpensesCurrent
Accrued compensation and benefits 983us-gaap_EmployeeRelatedLiabilitiesCurrent 618us-gaap_EmployeeRelatedLiabilitiesCurrent
Accrued interest 574ceru_DebtInstrumentAccruedInterest 234ceru_DebtInstrumentAccruedInterest
Total accrued expenses $ 3,648us-gaap_AccruedLiabilitiesCurrent $ 2,274us-gaap_AccruedLiabilitiesCurrent