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Share-Based Payments (Details Textual) (USD $)
 0 Months Ended 3 Months Ended 9 Months Ended 12 Months Ended 1 Months Ended
Dec. 12, 2013
Jan. 31, 2015
Jan. 31, 2014
Jan. 31, 2015
Jan. 31, 2014
Apr. 30, 2014
Apr. 30, 2013
Feb. 18, 2011
Share-based Compensation Arrangement by Share-based Payment Award, Options, Grants in Period, Gross       1,093,175us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsGrantsInPeriodGross   9,793,332us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsGrantsInPeriodGross 741,250us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsGrantsInPeriodGross  
Share Based Compensation Arrangement By Share Based Payment Award Warrants Outstanding   3,276,667csbr_ShareBasedCompensationArrangementByShareBasedPaymentAwardWarrantsOutstanding   3,276,667csbr_ShareBasedCompensationArrangementByShareBasedPaymentAwardWarrantsOutstanding   3,276,667csbr_ShareBasedCompensationArrangementByShareBasedPaymentAwardWarrantsOutstanding    
Share-based Compensation Arrangement by Share-based Payment Award, Options, Grants in Period, Weighted Average Grant Date Fair Value   $ 0us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsGrantsInPeriodWeightedAverageGrantDateFairValue $ 0.97us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsGrantsInPeriodWeightedAverageGrantDateFairValue $ 0.67us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsGrantsInPeriodWeightedAverageGrantDateFairValue $ 0.96us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsGrantsInPeriodWeightedAverageGrantDateFairValue $ 0.96us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsGrantsInPeriodWeightedAverageGrantDateFairValue $ 0.41us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsGrantsInPeriodWeightedAverageGrantDateFairValue  
Warrants Not Settleable in Cash, Fair Value Disclosure   $ 600,000us-gaap_WarrantsNotSettleableInCashFairValueDisclosure   $ 600,000us-gaap_WarrantsNotSettleableInCashFairValueDisclosure   $ 2,010,000us-gaap_WarrantsNotSettleableInCashFairValueDisclosure    
Percentage Of Cash Penalties       1.00%csbr_PercentageOfCashPenalties   1.00%csbr_PercentageOfCashPenalties    
Purchase Price Limit Percentage       10.00%csbr_PurchasePriceLimitPercentage   10.00%csbr_PurchasePriceLimitPercentage    
Allocated Share-based Compensation Expense, Total   657,000us-gaap_AllocatedShareBasedCompensationExpense 941,000us-gaap_AllocatedShareBasedCompensationExpense 2,284,000us-gaap_AllocatedShareBasedCompensationExpense 1,968,000us-gaap_AllocatedShareBasedCompensationExpense 2,807,000us-gaap_AllocatedShareBasedCompensationExpense 2,376,000us-gaap_AllocatedShareBasedCompensationExpense  
Stock Options Award Shares To Purchase Common Stock 200,000csbr_StockOptionsAwardSharesToPurchaseCommonStock              
Share-based Compensation Arrangement by Share-based Payment Award, Options, Vested in Period, Fair Value           15,000us-gaap_SharebasedCompensationArrangementBySharebasedPaymentAwardOptionsVestedInPeriodFairValue1 34,000us-gaap_SharebasedCompensationArrangementBySharebasedPaymentAwardOptionsVestedInPeriodFairValue1  
Accrued Liabilities [Member]                
Allocated Share-based Compensation Expense, Total       158,000us-gaap_AllocatedShareBasedCompensationExpense
/ us-gaap_EligibleItemOrGroupForFairValueOptionAxis
= us-gaap_AccruedLiabilitiesMember		        
Minimum [Member]                
Potential Penalties Amount       50,000csbr_PotentialPenaltiesAmount
/ us-gaap_RangeAxis
= us-gaap_MinimumMember		   50,000csbr_PotentialPenaltiesAmount
/ us-gaap_RangeAxis
= us-gaap_MinimumMember		    
Maximum [Member]                
Potential Penalties Amount       130,000csbr_PotentialPenaltiesAmount
/ us-gaap_RangeAxis
= us-gaap_MaximumMember		   130,000csbr_PotentialPenaltiesAmount
/ us-gaap_RangeAxis
= us-gaap_MaximumMember		    
Equity Incentive Plan 2010 [Member]                
Percentage Of Strike Price On Fair Market Value               100.00%csbr_PercentageOfStrikePriceOnFairMarketValue
/ us-gaap_PlanNameAxis
= csbr_EquityIncentivePlan2010Member
Stock Issued During Period, Shares, Restricted Stock Award, Net of Forfeitures               30,000,000us-gaap_StockIssuedDuringPeriodSharesRestrictedStockAwardNetOfForfeitures
/ us-gaap_PlanNameAxis
= csbr_EquityIncentivePlan2010Member
Director Compensation Plan [Member]                
Stock Options Award Shares To Purchase Unregistered Common Stock 20,000csbr_StockOptionsAwardSharesToPurchaseUnregisteredCommonStock
/ us-gaap_PlanNameAxis
= csbr_DirectorCompensationPlanMember		              
Stock Options Award Shares To Purchase Common Stock 100,000csbr_StockOptionsAwardSharesToPurchaseCommonStock
/ us-gaap_PlanNameAxis
= csbr_DirectorCompensationPlanMember		              
Share Based Compensation Arrangement By Share Based Payment Award Options Vested Percentage 25.00%csbr_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsVestedPercentage
/ us-gaap_PlanNameAxis
= csbr_DirectorCompensationPlanMember		              
Chief Executive Officer and President [Member]                
Share-based Compensation Arrangement by Share-based Payment Award, Options, Grants in Period, Gross       3,000,000us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsGrantsInPeriodGross
/ us-gaap_TitleOfIndividualAxis
= csbr_ChiefExecutiveOfficerAndPresidentMember		   3,000,000us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsGrantsInPeriodGross
/ us-gaap_TitleOfIndividualAxis
= csbr_ChiefExecutiveOfficerAndPresidentMember		    
Share-based Compensation Arrangement by Share-based Payment Award, Options, Grants in Period, Net of Forfeitures, Total       3,000,000us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsGrantsInPeriod
/ us-gaap_TitleOfIndividualAxis
= csbr_ChiefExecutiveOfficerAndPresidentMember		   3,000,000us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsGrantsInPeriod
/ us-gaap_TitleOfIndividualAxis
= csbr_ChiefExecutiveOfficerAndPresidentMember		    
April 2011 Private Placement [Member]                
Warrants Issued During Period for Common Stock       1,266,667csbr_WarrantsIssuedDuringPeriodForCommonStock
/ us-gaap_SubsidiarySaleOfStockAxis
= csbr_April2011PrivatePlacementMember		   1,266,667csbr_WarrantsIssuedDuringPeriodForCommonStock
/ us-gaap_SubsidiarySaleOfStockAxis
= csbr_April2011PrivatePlacementMember		    
April 2011 Private Placement [Member] | Minimum [Member]                
Class of Warrant or Right, Exercise Price of Warrants or Rights   $ 0.50us-gaap_ClassOfWarrantOrRightExercisePriceOfWarrantsOrRights1
/ us-gaap_RangeAxis
= us-gaap_MinimumMember
/ us-gaap_SubsidiarySaleOfStockAxis
= csbr_April2011PrivatePlacementMember		   $ 0.50us-gaap_ClassOfWarrantOrRightExercisePriceOfWarrantsOrRights1
/ us-gaap_RangeAxis
= us-gaap_MinimumMember
/ us-gaap_SubsidiarySaleOfStockAxis
= csbr_April2011PrivatePlacementMember		        
April 2011 Private Placement [Member] | Maximum [Member]                
Class of Warrant or Right, Exercise Price of Warrants or Rights   $ 0.90us-gaap_ClassOfWarrantOrRightExercisePriceOfWarrantsOrRights1
/ us-gaap_RangeAxis
= us-gaap_MaximumMember
/ us-gaap_SubsidiarySaleOfStockAxis
= csbr_April2011PrivatePlacementMember		   $ 0.90us-gaap_ClassOfWarrantOrRightExercisePriceOfWarrantsOrRights1
/ us-gaap_RangeAxis
= us-gaap_MaximumMember
/ us-gaap_SubsidiarySaleOfStockAxis
= csbr_April2011PrivatePlacementMember		        
January 2013 Private Placement [Member]                
Warrants Issued During Period for Common Stock       1,860,000csbr_WarrantsIssuedDuringPeriodForCommonStock
/ us-gaap_SubsidiarySaleOfStockAxis
= csbr_January2013PrivatePlacementMember		   1,860,000csbr_WarrantsIssuedDuringPeriodForCommonStock
/ us-gaap_SubsidiarySaleOfStockAxis
= csbr_January2013PrivatePlacementMember		    
Warrants and Rights Outstanding   $ 800,000us-gaap_WarrantsAndRightsOutstanding
/ us-gaap_SubsidiarySaleOfStockAxis
= csbr_January2013PrivatePlacementMember		   $ 800,000us-gaap_WarrantsAndRightsOutstanding
/ us-gaap_SubsidiarySaleOfStockAxis
= csbr_January2013PrivatePlacementMember		        
Equity [Member]                
Warrants Issued During Period for Common Stock       150,000csbr_WarrantsIssuedDuringPeriodForCommonStock
/ us-gaap_SubsidiarySaleOfStockAxis
= us-gaap_EquityMember		   150,000csbr_WarrantsIssuedDuringPeriodForCommonStock
/ us-gaap_SubsidiarySaleOfStockAxis
= us-gaap_EquityMember		    
Class of Warrant or Right, Exercise Price of Warrants or Rights   $ 1.00us-gaap_ClassOfWarrantOrRightExercisePriceOfWarrantsOrRights1
/ us-gaap_SubsidiarySaleOfStockAxis
= us-gaap_EquityMember		   $ 1.00us-gaap_ClassOfWarrantOrRightExercisePriceOfWarrantsOrRights1
/ us-gaap_SubsidiarySaleOfStockAxis
= us-gaap_EquityMember