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Provision for Income Taxes (Details) (USD $)
In Thousands, unless otherwise specified
 3 Months Ended 9 Months Ended 12 Months Ended
Jan. 31, 2015
Jan. 31, 2014
Jan. 31, 2015
Jan. 31, 2014
Apr. 30, 2014
Apr. 30, 2013
Provision for Income Taxes, Current, Federal         $ 0us-gaap_CurrentFederalTaxExpenseBenefit $ 0us-gaap_CurrentFederalTaxExpenseBenefit
Provision for Income Taxes, Current, State         5us-gaap_CurrentStateAndLocalTaxExpenseBenefit 2us-gaap_CurrentStateAndLocalTaxExpenseBenefit
Provision for Income Taxes, Current, Foriegn         12us-gaap_CurrentForeignTaxExpenseBenefit 8us-gaap_CurrentForeignTaxExpenseBenefit
Provision for Income Taxes, Current, Total         17us-gaap_CurrentIncomeTaxExpenseBenefit 10us-gaap_CurrentIncomeTaxExpenseBenefit
Provision for Income Taxes, Deferred, Federal         (2,015)us-gaap_DeferredFederalIncomeTaxExpenseBenefit (2,258)us-gaap_DeferredFederalIncomeTaxExpenseBenefit
Provision for Income Taxes, Deferred, State         (148)us-gaap_DeferredStateAndLocalIncomeTaxExpenseBenefit (196)us-gaap_DeferredStateAndLocalIncomeTaxExpenseBenefit
Provision for Income Taxes, Deferred, Foreign         0us-gaap_DeferredForeignIncomeTaxExpenseBenefit 0us-gaap_DeferredForeignIncomeTaxExpenseBenefit
Provision for Income Taxes, Deferred, Total         (2,163)us-gaap_DeferredIncomeTaxExpenseBenefit (2,454)us-gaap_DeferredIncomeTaxExpenseBenefit
Provision for Income Taxes, Change in valuation allowance, Federal         2,015csbr_FederalIncomeTaxValuationAllowance 2,258csbr_FederalIncomeTaxValuationAllowance
Provision for Income Taxes, Change in valuation allowance, State         148csbr_StateAndLocalIncomeTaxValuationAllowance 196csbr_StateAndLocalIncomeTaxValuationAllowance
Provision for Income Taxes, Change in valuation allowance, Foreign         0csbr_ForeignIncomeTaxValuationAllowance 0csbr_ForeignIncomeTaxValuationAllowance
Provision for Income Taxes, Change in valuation allowance, Total         2,163csbr_ValuationAllowances 2,454csbr_ValuationAllowances
Provision for Income Taxes, Total, Federal         0us-gaap_FederalIncomeTaxExpenseBenefitContinuingOperations 0us-gaap_FederalIncomeTaxExpenseBenefitContinuingOperations
Provision for Income Taxes, Total, State         5us-gaap_StateAndLocalIncomeTaxExpenseBenefitContinuingOperations 2us-gaap_StateAndLocalIncomeTaxExpenseBenefitContinuingOperations
Provision for Income Taxes, Total, Foreign         12us-gaap_ForeignIncomeTaxExpenseBenefitContinuingOperations 8us-gaap_ForeignIncomeTaxExpenseBenefitContinuingOperations
Provision for Income Taxes, Total $ 12us-gaap_IncomeTaxExpenseBenefit $ 5us-gaap_IncomeTaxExpenseBenefit $ 27us-gaap_IncomeTaxExpenseBenefit $ 13us-gaap_IncomeTaxExpenseBenefit $ 17us-gaap_IncomeTaxExpenseBenefit $ 10us-gaap_IncomeTaxExpenseBenefit