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CONSOLIDATED STATEMENT OF CHANGES IN STOCKHOLDERS' EQUITY (Parenthetical) $ in Thousands | 12 Months Ended
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Apr. 30, 2017 USD ($)
Statement of Stockholders' Equity [Abstract] |
Issuance cost of common stock | $ 742

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

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- References No definition available. + Details
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Namespace Prefix: | us-gaap_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration