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v2.4.1.9

Share-Based Payments (Details Textual) (USD $) | 3 Months Ended | 6 Months Ended |
--- | --- | --- | ---
Oct. 31, 2014 | Oct. 31, 2013 | Oct. 31, 2014 | Oct. 31, 2013 | Apr. 30, 2014
Share-based Compensation Arrangement by Share-based Payment Award, Options, Grants in Period, Gross |  |  | 1,093,175 us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsGrantsInPeriodGross |  |
Share Based Compensation Arrangement By Share Based Payment Award Warrants Outstanding | 3,276,667 csbr_ShareBasedCompensationArrangementByShareBasedPaymentAwardWarrantsOutstanding |  | 3,276,667 csbr_ShareBasedCompensationArrangementByShareBasedPaymentAwardWarrantsOutstanding |  | 3,276,667 csbr_ShareBasedCompensationArrangementByShareBasedPaymentAwardWarrantsOutstanding
Share-based Compensation Arrangement by Share-based Payment Award, Options, Grants in Period, Weighted Average Grant Date Fair Value | $ 0.69 us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsGrantsInPeriodWeightedAverageGrantDateFairValue | $ 1.06 us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsGrantsInPeriodWeightedAverageGrantDateFairValue | $ 0.71 us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsGrantsInPeriodWeightedAverageGrantDateFairValue | $ 0.94 us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsGrantsInPeriodWeightedAverageGrantDateFairValue |
Warrants Not Settleable in Cash, Fair Value Disclosure | $ 1,230,000 us-gaap_WarrantsNotSettleableInCashFairValueDisclosure |  | $ 1,230,000 us-gaap_WarrantsNotSettleableInCashFairValueDisclosure |  | $ 2,010,000 us-gaap_WarrantsNotSettleableInCashFairValueDisclosure
Percentage Of Cash Penalties |  |  | 1.00%csbr_PercentageOfCashPenalties |  |
Purchase Price Limit Percentage |  |  | 10.00%csbr_PurchasePriceLimitPercentage |  |
Minimum [Member] |  |  |  |  |
Potential Penalties Amount |  |  | 50,000 csbr_PotentialPenaltiesAmount / us-gaap_RangeAxis = us-gaap_MinimumMember |  |
Maximum [Member] |  |  |  |  |
Potential Penalties Amount |  |  | 130,000 csbr_PotentialPenaltiesAmount / us-gaap_RangeAxis = us-gaap_MaximumMember |  |
Chief Executive Officer and President [Member] |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award, Options, Grants in Period, Gross |  |  | 3,000,000 us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsGrantsInPeriodGross / us-gaap_TitleOfIndividualAxis = csbr_ChiefExecutiveOfficerAndPresidentMember |  |
Share-based Compensation Arrangement by Share-based Payment Award, Options, Grants in Period, Net of Forfeitures, Total |  |  | 3,000,000 us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsGrantsInPeriod / us-gaap_TitleOfIndividualAxis = csbr_ChiefExecutiveOfficerAndPresidentMember |  |
April 2011 Private Placement [Member] |  |  |  |  |
Warrants Issued During Period for Common Stock |  |  | 1,266,667 csbr_WarrantsIssuedDuringPeriodForCommonStock / us-gaap_SubsidiarySaleOfStockAxis = csbr_April2011PrivatePlacementMember |  |
April 2011 Private Placement [Member] | Minimum [Member] |  |  |  |  |
Class of Warrant or Right, Exercise Price of Warrants or Rights | $ 0.50 us-gaap_ClassOfWarrantOrRightExercisePriceOfWarrantsOrRights1 / us-gaap_RangeAxis = us-gaap_MinimumMember / us-gaap_SubsidiarySaleOfStockAxis = csbr_April2011PrivatePlacementMember |  | $ 0.50 us-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 | $ 0.90 us-gaap_ClassOfWarrantOrRightExercisePriceOfWarrantsOrRights1 / us-gaap_RangeAxis = us-gaap_MaximumMember / us-gaap_SubsidiarySaleOfStockAxis = csbr_April2011PrivatePlacementMember |  | $ 0.90 us-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 |  |  | 1,860,000 csbr_WarrantsIssuedDuringPeriodForCommonStock / us-gaap_SubsidiarySaleOfStockAxis = csbr_January2013PrivatePlacementMember |  |
Warrants and Rights Outstanding | $ 800,000 us-gaap_WarrantsAndRightsOutstanding / us-gaap_SubsidiarySaleOfStockAxis = csbr_January2013PrivatePlacementMember |  | $ 800,000 us-gaap_WarrantsAndRightsOutstanding / us-gaap_SubsidiarySaleOfStockAxis = csbr_January2013PrivatePlacementMember |  |
Equity Instrument [Member] |  |  |  |  |
Warrants Issued During Period for Common Stock |  |  | 150,000 csbr_WarrantsIssuedDuringPeriodForCommonStock / us-gaap_SubsidiarySaleOfStockAxis = csbr_EquityInstrumentMember |  |
Class of Warrant or Right, Exercise Price of Warrants or Rights | $ 1.00 us-gaap_ClassOfWarrantOrRightExercisePriceOfWarrantsOrRights1 / us-gaap_SubsidiarySaleOfStockAxis = csbr_EquityInstrumentMember |  | $ 1.00 us-gaap_ClassOfWarrantOrRightExercisePriceOfWarrantsOrRights1 / us-gaap_SubsidiarySaleOfStockAxis = csbr_EquityInstrumentMember |  |

X
- Definition Percentage of cash penalty equal to the aggregate purchase price paid by investor. + References No definition available. + Details
Name: | csbr_PercentageOfCashPenalties
Namespace Prefix: | csbr_
Data Type: | num:percentItemType
Balance Type: | na
Period Type: | duration

X
- Definition The total amount of potential penalties under this registration payment arrangement. + References No definition available. + Details
Name: | csbr_PotentialPenaltiesAmount
Namespace Prefix: | csbr_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

X
- Definition Percentage describes the limit of the aggregate Purchase Price paid by the investors. + References No definition available. + Details
Name: | csbr_PurchasePriceLimitPercentage
Namespace Prefix: | csbr_
Data Type: | num:percentItemType
Balance Type: | na
Period Type: | duration

X
- Definition The number of share warrants outstanding in connection with the financing arrangement. + References No definition available. + Details
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Namespace Prefix: | csbr_
Data Type: | xbrli:sharesItemType
Balance Type: | na
Period Type: | instant

X
- Definition The number warrants issued during the period for purchase of common stock. + References No definition available. + Details
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Namespace Prefix: | csbr_
Data Type: | xbrli:sharesItemType
Balance Type: | na
Period Type: | duration

X
- Definition Exercise price per share or per unit of warrants or rights outstanding. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 235 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.4-08.(i)(4)) -URI http://asc.fasb.org/extlink&oid=26873400&loc=d3e23780-122690 + Details
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Namespace Prefix: | us-gaap_
Data Type: | num:perShareItemType
Balance Type: | na
Period Type: | instant

X
- Definition Net number of share options (or share units) granted during the period. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (c)(1)(iv)(1) -URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901 + Details
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Namespace Prefix: | us-gaap_
Data Type: | xbrli:sharesItemType
Balance Type: | na
Period Type: | duration

X
- Definition Gross number of share options (or share units) granted during the period. + References No definition available. + Details
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Namespace Prefix: | us-gaap_
Data Type: | xbrli:sharesItemType
Balance Type: | na
Period Type: | duration

X
- Definition The weighted average grant-date fair value of options granted during the reporting period as calculated by applying the disclosed option pricing methodology. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (d)(1) -URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901 + Details
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Namespace Prefix: | us-gaap_
Data Type: | num:perShareItemType
Balance Type: | na
Period Type: | duration

X
- Definition Value of outstanding derivative securities that permit the holder the right to purchase securities (usually equity) from the issuer at a specified price. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 235 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.4-08.(i)) -URI http://asc.fasb.org/extlink&oid=26873400&loc=d3e23780-122690 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 08 -Paragraph i -Article 4 + Details
Name: | us-gaap_WarrantsAndRightsOutstanding
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

X
- Definition Fair value portion of warrants not settleable in cash classified as equity. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 820 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=36462937&loc=d3e19207-110258 + Details
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Namespace Prefix: | us-gaap_
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Balance Type: | credit
Period Type: | instant

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- Details
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- Details
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Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

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- Details
Name: | us-gaap_SubsidiarySaleOfStockAxis=csbr_April2011PrivatePlacementMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

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- Details
Name: | us-gaap_SubsidiarySaleOfStockAxis=csbr_EquityInstrumentMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

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- Details
Name: | us-gaap_SubsidiarySaleOfStockAxis=csbr_January2013PrivatePlacementMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

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- Details
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Namespace Prefix: |
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