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Commitments and Contingencies (Details Textual) (USD $) | 9 Months Ended | 12 Months Ended
--- | --- | ---
Jan. 31, 2015 | Jan. 31, 2014 | Apr. 30, 2014 | Apr. 30, 2013
Corporate Headquarters [Member] |  |  |  |
Commitments and Contingencies [Line Items] |  |  |  |
Lease Expiration Date | Nov. 30, 2016 |  | Nov. 30, 2016 |
Operating Leases, Rent Expense | $ 64,000us-gaap_LeaseAndRentalExpense / us-gaap_PropertySubjectToOrAvailableForOperatingLeaseAxis = csbr_CorporateHeadquartersMember | $ 53,000us-gaap_LeaseAndRentalExpense / us-gaap_PropertySubjectToOrAvailableForOperatingLeaseAxis = csbr_CorporateHeadquartersMember | $ 75,000us-gaap_LeaseAndRentalExpense / us-gaap_PropertySubjectToOrAvailableForOperatingLeaseAxis = csbr_CorporateHeadquartersMember | $ 69,000us-gaap_LeaseAndRentalExpense / us-gaap_PropertySubjectToOrAvailableForOperatingLeaseAxis = csbr_CorporateHeadquartersMember
Laboratories and Office Space [Member] |  |  |  |
Commitments and Contingencies [Line Items] |  |  |  |
Lease Expiration Date | Jun. 30, 2016 |  | Jun. 30, 2014 |
Operating Leases, Rent Expense | 65,000us-gaap_LeaseAndRentalExpense / us-gaap_PropertySubjectToOrAvailableForOperatingLeaseAxis = csbr_LaboratoriesAndOfficeSpaceMember | 64,000us-gaap_LeaseAndRentalExpense / us-gaap_PropertySubjectToOrAvailableForOperatingLeaseAxis = csbr_LaboratoriesAndOfficeSpaceMember | 85,000us-gaap_LeaseAndRentalExpense / us-gaap_PropertySubjectToOrAvailableForOperatingLeaseAxis = csbr_LaboratoriesAndOfficeSpaceMember | 90,000us-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 | 0us-gaap_LeaseAndRentalExpense / us-gaap_PropertySubjectToOrAvailableForOperatingLeaseAxis = csbr_IsraelOfficeHeadquartersMember | 6,000us-gaap_LeaseAndRentalExpense / us-gaap_PropertySubjectToOrAvailableForOperatingLeaseAxis = csbr_IsraelOfficeHeadquartersMember | 6,000us-gaap_LeaseAndRentalExpense / us-gaap_PropertySubjectToOrAvailableForOperatingLeaseAxis = csbr_IsraelOfficeHeadquartersMember | 28,000us-gaap_LeaseAndRentalExpense / us-gaap_PropertySubjectToOrAvailableForOperatingLeaseAxis = csbr_IsraelOfficeHeadquartersMember
Singapore Office Headquarters in Singapore [Member] |  |  |  |
Commitments and Contingencies [Line Items] |  |  |  |
Lease Expiration Date | Jan. 31, 2015 |  | Jan. 31, 2015 |
Operating Leases, Rent Expense | 4,000us-gaap_LeaseAndRentalExpense / us-gaap_PropertySubjectToOrAvailableForOperatingLeaseAxis = csbr_SingaporeOfficeHeadquartersInSingaporeMember | 4,000us-gaap_LeaseAndRentalExpense / us-gaap_PropertySubjectToOrAvailableForOperatingLeaseAxis = csbr_SingaporeOfficeHeadquartersInSingaporeMember | 5,000us-gaap_LeaseAndRentalExpense / us-gaap_PropertySubjectToOrAvailableForOperatingLeaseAxis = csbr_SingaporeOfficeHeadquartersInSingaporeMember | 2,000us-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 | $ 35,000us-gaap_LeaseAndRentalExpense / us-gaap_PropertySubjectToOrAvailableForOperatingLeaseAxis = csbr_NewYorkLaboratoryMember |  |  |

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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
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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
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