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Fair Value (Details Textual) (USD $) | Oct. 31, 2013 | Apr. 30, 2013
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Estimated Fair Value of Warrants | $ 3,094,000 | $ 1,046,000

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- Definition The estimated fair value of warrants. + References No definition available. + Details
Name: | csbr_EstimatedFairValueOfWarrants
Namespace Prefix: | csbr_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant