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Share-Based Payments (Details Textual) - Income Statement Location [Domain] - USD ($) $ / shares in Units, $ in Thousands	3 Months Ended
	Jul. 31, 2015	Jul. 31, 2014	Apr. 30, 2015
Stock-based compensation expense	$ 775	$ 808
Share-based Compensation Arrangement by Share-based Payment Award, Options, Grants in Period, Weighted Average Grant Date Fair Value	$ 4.85	$ 8.28
Share-based Compensation Arrangement by Share-based Payment Award, Options, Grants in Period, Gross	73,333
Share Based Compensation Arrangement By Share Based Payment Award Warrants Outstanding	2,109,840		2,109,840
Chief Executive Officer and President [Member]
Share-based Compensation Arrangement by Share-based Payment Award, Options, Grants in Period, Gross	224,663
Share-based Compensation Arrangement by Share-based Payment Award, Options, Grants in Period, Net of Forfeitures, Total	224,663
March 2015 Private Placement [Member]
Warrants Issued During Period for Common Stock	1,849,285

X

- Definition

The number of share warrants outstanding in connection with the financing arrangement.

+ References

No definition available.

+ Details

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Namespace Prefix:	csbr_
Data Type:	xbrli:sharesItemType
Balance Type:	na
Period Type:	instant

X

- Definition

The number warrants issued during the period for purchase of common stock.

+ References

No definition available.

+ Details

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Namespace Prefix:	csbr_
Data Type:	xbrli:sharesItemType
Balance Type:	na
Period Type:	duration

X

- Definition

Represents the expense recognized during the period arising from equity-based compensation arrangements (for example, shares of stock, unit, stock options or other equity instruments) with employees, directors and certain consultants qualifying for treatment as employees.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef



-Publisher FASB



-Name Accounting Standards Codification



-Topic 718



-SubTopic 10



-Section S99



-Paragraph 1



-Subparagraph (SAB TOPIC 14.F)



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-Publisher SEC



-Name Staff Accounting Bulletin (SAB)



-Number Topic 14



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Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	duration

X

- Definition

Net number of share options (or share units) granted during the period.

+ References

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-Publisher FASB



-Name Accounting Standards Codification



-Topic 718



-SubTopic 10



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-Paragraph 2



-Subparagraph (c)(1)(iv)(1)



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X

- Definition

Gross number of share options (or share units) granted during the period.

+ References

No definition available.

+ Details

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- Definition

The weighted average grant-date fair value of options granted during the reporting period as calculated by applying the disclosed option pricing methodology.

+ References

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-Publisher FASB



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X

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X

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