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Difference Between Provision for Income Taxes and Amounts Computed by Applying Federal Statutory Income Tax Rate to Loss before Taxes (Detail) (USD $) In Thousands, unless otherwise specified	12 Months Ended
	Dec. 31, 2014	Dec. 31, 2013	Dec. 31, 2012
Reconciliation of Provision of Income Taxes [Line Items]
Federal statutory tax	$ (13,110)us-gaap_IncomeTaxReconciliationIncomeTaxExpenseBenefitAtFederalStatutoryIncomeTaxRate	$ (14,661)us-gaap_IncomeTaxReconciliationIncomeTaxExpenseBenefitAtFederalStatutoryIncomeTaxRate	$ (5,329)us-gaap_IncomeTaxReconciliationIncomeTaxExpenseBenefitAtFederalStatutoryIncomeTaxRate
Stock-based compensation	(8)us-gaap_IncomeTaxReconciliationNondeductibleExpenseShareBasedCompensationCost	(10)us-gaap_IncomeTaxReconciliationNondeductibleExpenseShareBasedCompensationCost	99us-gaap_IncomeTaxReconciliationNondeductibleExpenseShareBasedCompensationCost
Lobbying expenses	33cers_IncomeTaxReconciliationNondeductibleExpenseLobbyingExpenses	107cers_IncomeTaxReconciliationNondeductibleExpenseLobbyingExpenses	51cers_IncomeTaxReconciliationNondeductibleExpenseLobbyingExpenses
Warrants	(3,367)cers_IncomeTaxReconciliationChangeInFairValueOfWarrants	4,926cers_IncomeTaxReconciliationChangeInFairValueOfWarrants	(706)cers_IncomeTaxReconciliationChangeInFairValueOfWarrants
Foreign rate differential	43us-gaap_IncomeTaxReconciliationForeignIncomeTaxRateDifferential	(121)us-gaap_IncomeTaxReconciliationForeignIncomeTaxRateDifferential	(53)us-gaap_IncomeTaxReconciliationForeignIncomeTaxRateDifferential
Expiration of federal net operating losses and credits-tax effected	0cers_IncomeTaxReconciliationExpirationOfFederalNetOperatingLosses	0cers_IncomeTaxReconciliationExpirationOfFederalNetOperatingLosses	4,352cers_IncomeTaxReconciliationExpirationOfFederalNetOperatingLosses
Change in valuation allowance	16,576us-gaap_IncomeTaxReconciliationChangeInDeferredTaxAssetsValuationAllowance	9,955us-gaap_IncomeTaxReconciliationChangeInDeferredTaxAssetsValuationAllowance	1,809us-gaap_IncomeTaxReconciliationChangeInDeferredTaxAssetsValuationAllowance
Other	28us-gaap_IncomeTaxReconciliationOtherAdjustments	22us-gaap_IncomeTaxReconciliationOtherAdjustments	19us-gaap_IncomeTaxReconciliationOtherAdjustments
Provision for income taxes	$ 195us-gaap_IncomeTaxExpenseBenefit	$ 218us-gaap_IncomeTaxExpenseBenefit	$ 242us-gaap_IncomeTaxExpenseBenefit

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Amount of current income tax expense (benefit) and deferred income tax expense (benefit) pertaining to continuing operations.

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Amount of the difference between reported income tax expense (benefit) and expected income tax expense (benefit) computed by applying the domestic federal statutory income tax rates to pretax income (loss) from continuing operations attributable to increase (decrease) in the valuation allowance for deferred tax assets.

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Amount of the difference between reported income tax expense (benefit) and expected income tax expense (benefit) computed by applying the domestic federal statutory income tax rates to pretax income (loss) from continuing operations attributable to foreign income tax expense (benefit).

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Amount of the difference between reported income tax expense (benefit) and expected income tax expense (benefit) computed by applying the domestic federal statutory income tax rates to pretax income (loss) from continuing operations attributable to nondeductible equity-based compensation costs.

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