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Commitments and Contingencies (Details Textual) (USD $) | 9 Months Ended
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Jan. 31, 2015 | Jan. 31, 2014
Corporate Headquarters [Member] |  |
Commitments and Contingencies [Line Items] |  |
Lease Expiration Date | Nov. 30, 2016 |
Operating Leases, Rent Expense | $ 64,000 us-gaap_LeaseAndRentalExpense / us-gaap_PropertySubjectToOrAvailableForOperatingLeaseAxis = csbr_CorporateHeadquartersMember | $ 53,000 us-gaap_LeaseAndRentalExpense / us-gaap_PropertySubjectToOrAvailableForOperatingLeaseAxis = csbr_CorporateHeadquartersMember
Laboratories and Office Space [Member] |  |
Commitments and Contingencies [Line Items] |  |
Lease Expiration Date | Jun. 30, 2016 |
Operating Leases, Rent Expense | 65,000 us-gaap_LeaseAndRentalExpense / us-gaap_PropertySubjectToOrAvailableForOperatingLeaseAxis = csbr_LaboratoriesAndOfficeSpaceMember | 64,000 us-gaap_LeaseAndRentalExpense / us-gaap_PropertySubjectToOrAvailableForOperatingLeaseAxis = csbr_LaboratoriesAndOfficeSpaceMember
Israel Office Headquarters [Member] |  |
Commitments and Contingencies [Line Items] |  |
Lease Expiration Date | Jul. 31, 2013 |
Operating Leases, Rent Expense | 0 us-gaap_LeaseAndRentalExpense / us-gaap_PropertySubjectToOrAvailableForOperatingLeaseAxis = csbr_IsraelOfficeHeadquartersMember | 6,000 us-gaap_LeaseAndRentalExpense / us-gaap_PropertySubjectToOrAvailableForOperatingLeaseAxis = csbr_IsraelOfficeHeadquartersMember
Singapore Office Headquarters in Singapore [Member] |  |
Commitments and Contingencies [Line Items] |  |
Lease Expiration Date | Jan. 31, 2015 |
Operating Leases, Rent Expense | 4,000 us-gaap_LeaseAndRentalExpense / us-gaap_PropertySubjectToOrAvailableForOperatingLeaseAxis = csbr_SingaporeOfficeHeadquartersInSingaporeMember | 4,000 us-gaap_LeaseAndRentalExpense / us-gaap_PropertySubjectToOrAvailableForOperatingLeaseAxis = csbr_SingaporeOfficeHeadquartersInSingaporeMember
New York Laboratory [Member] |  |
Commitments and Contingencies [Line Items] |  |
Lease Expiration Date | Sep. 30, 2015 |
Operating Leases, Rent Expense | $ 35,000 us-gaap_LeaseAndRentalExpense / us-gaap_PropertySubjectToOrAvailableForOperatingLeaseAxis = csbr_NewYorkLaboratoryMember |

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- Details
Name: | csbr_CommitmentsAndContingenciesLineItems
Namespace Prefix: | csbr_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration

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- Definition Amount of rent expense incurred for leased assets, including but not limited to, furniture and equipment, that is not directly or indirectly associated with the manufacture, sale or creation of a product or product line. + References No definition available. + Details
Name: | us-gaap_LeaseAndRentalExpense
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

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- Definition Date which lease or group of leases is set to expire, in CCYY-MM-DD format. + References No definition available. + Details
Name: | us-gaap_LeaseExpirationDate1
Namespace Prefix: | us-gaap_
Data Type: | xbrli:dateItemType
Balance Type: | na
Period Type: | duration

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- Details
Name: | us-gaap_PropertySubjectToOrAvailableForOperatingLeaseAxis=csbr_CorporateHeadquartersMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

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- Details
Name: | us-gaap_PropertySubjectToOrAvailableForOperatingLeaseAxis=csbr_IsraelOfficeHeadquartersMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

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- Details
Name: | us-gaap_PropertySubjectToOrAvailableForOperatingLeaseAxis=csbr_LaboratoriesAndOfficeSpaceMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

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- Details
Name: | us-gaap_PropertySubjectToOrAvailableForOperatingLeaseAxis=csbr_NewYorkLaboratoryMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

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- Details
Name: | us-gaap_PropertySubjectToOrAvailableForOperatingLeaseAxis=csbr_SingaporeOfficeHeadquartersInSingaporeMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |