XML 41 R30.htm IDEA: XBRL DOCUMENT
v3.10.0.1

Commitments and Contingencies - Narrative (Details) - USD ($) | 3 Months Ended | 12 Months Ended
--- | --- | ---
Jul. 31, 2016 | Apr. 30, 2018 | Apr. 30, 2017
Commitments and Contingencies [Line Items] |  |  |
Operating leases, rent expense |  | $ 657,000 | $ 398,000
Corporate Headquarters |  |  |
Commitments and Contingencies [Line Items] |  |  |
Operating leases, rent expense | $ 86,000 | 90,000 |
Laboratories and Office Space |  |  |
Commitments and Contingencies [Line Items] |  |  |
Operating leases, rent expense |  | 59,000 | 105,000
New York Laboratory |  |  |
Commitments and Contingencies [Line Items] |  |  |
Operating leases, rent expense |  | 52,000 | 207,000
Rockville, MD |  |  |
Commitments and Contingencies [Line Items] |  |  |
Operating leases, rent expense |  | $ 454,000 | $ 0
Minimum |  |  |
Commitments and Contingencies [Line Items] |  |  |
Royalty payment, as percent of contract price |  | 2.00% |
Maximum |  |  |
Commitments and Contingencies [Line Items] |  |  |
Royalty fee per tumor sample |  | $ 7,000 |
Royalty payment, as percent of contract price |  | 5.00% |

X
- Definition Collaboration Arrangement Royalty Fee + References No definition available. + Details
Name: | csbr_CollaborationArrangementRoyaltyFee
Namespace Prefix: | csbr_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | duration

X
- Definition Collaboration Arrangement, Royalty Fee, Percent Of Contract Price + References No definition available. + Details
Name: | csbr_CollaborationArrangementRoyaltyFeePercentOfContractPrice
Namespace Prefix: | csbr_
Data Type: | num:percentItemType
Balance Type: | na
Period Type: | duration

X
- References No definition available. + Details
Name: | csbr_CommitmentsAndContingenciesLineItems
Namespace Prefix: | csbr_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration

X
- 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

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

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

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

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

X
- Details
Name: | us-gaap_RangeAxis=us-gaap_MinimumMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_RangeAxis=us-gaap_MaximumMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |