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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 |  |  |  |

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- Definition Number of shares to purchase common stock option awards during the reporting period. + References No definition available. + Details
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- Definition Represents the expense recognized during the period arising from equity-based compensation arrangements (for example, shares of stock, unit, stock options or other equity instruments) with employees, directors and certain consultants qualifying for treatment as employees. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 1 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5047-113901 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SAB TOPIC 14.F) -URI http://asc.fasb.org/extlink&oid=27013229&loc=d3e301413-122809 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (h)(1)(i) -URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901 Reference 4: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Staff Accounting Bulletin (SAB) -Number Topic 14 -Section F + Details
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