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CONSOLIDATED STATEMENT OF CHANGES IN STOCKHOLDERS' EQUITY (Parenthetical) $ in Thousands | 12 Months Ended
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Apr. 30, 2015 USD ($)
Issuance Cost of Common Stock | $ 880

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- Definition The cost incurred during the period for sale of common stock. + References No definition available. + Details
Name: | csbr_IssuanceCostOfCommonStock
Namespace Prefix: | csbr_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration