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Subsequent Events (Details Textual) (USD $) In Millions, except Share data, unless otherwise specified | 0 Months Ended | 9 Months Ended | 1 Months Ended | 12 Months Ended | 0 Months Ended |
--- | --- | --- | --- | --- | --- | ---
Dec. 01, 2014 | Jan. 31, 2015 | Mar. 24, 2011 | Apr. 30, 2013 | Mar. 13, 2015 | Mar. 11, 2015 | Jan. 28, 2013
Subsequent Event [Line Items] |  |  |  |  |  |  |
Debt Conversion, Original Debt, Amount | $ 1us-gaap_DebtConversionOriginalDebtAmount1 |  |  |  |  |  |
Term Of Warrants | 5 years |  |  |  |  |  |
Repurchase Of Stock In Put Option |  | $ 0.40csbr_RepurchaseOfStockInPutOption |  |  |  |  |
2011 Securities Purchase Agreement [Member] |  |  |  |  |  |  |
Subsequent Event [Line Items] |  |  |  |  |  |  |
Stock Issued During Period, Shares, New Issues |  |  | 1,865,853us-gaap_StockIssuedDuringPeriodSharesNewIssues / csbr_AgreementAxis = csbr_SecuritiesPurchaseAgreementMember |  |  |  |
Common Stock [Member] |  |  |  |  |  |  |
Subsequent Event [Line Items] |  |  |  |  |  |  |
Stock Issued During Period, Shares, New Issues |  |  |  | 1,064,658us-gaap_StockIssuedDuringPeriodSharesNewIssues / us-gaap_StatementEquityComponentsAxis = us-gaap_CommonStockMember |  |  |
Subsequent Event [Member] |  |  |  |  |  |  |
Subsequent Event [Line Items] |  |  |  |  |  |  |
Unit Description |  |  |  |  | each unit consisting of one share of the Company's Common Stock, par value $0.001 per share (the "Common Stock"), and a warrant to buy 0.55 shares of Common Stock at $0.48 per share (the "Warrants"), at a purchase price of $0.40 per unit, for an aggregate of approximately$14,000,000. | each unit consisting of one share of the Company's common stock, par value $0.001 per share,and a warrant to buy 0.55 shares of common stock at $0.48 per share, at a purchase price of $0.40 per unit, for an aggregate of approximately$14,000,000 |
Subsequent Event [Member] | 2011 Securities Purchase Agreement [Member] |  |  |  |  |  |  |
Subsequent Event [Line Items] |  |  |  |  |  |  |
Additional Warrants Issued to Investors |  |  | 1,583,335csbr_AdditionalWarrantsIssuedToInvestors / csbr_AgreementAxis = csbr_SecuritiesPurchaseAgreementMember / us-gaap_SubsequentEventTypeAxis = us-gaap_SubsequentEventMember |  |  |  |
Warrant Exercise Price |  |  | 0.40csbr_WarrantExercisePrice / csbr_AgreementAxis = csbr_SecuritiesPurchaseAgreementMember / us-gaap_SubsequentEventTypeAxis = us-gaap_SubsequentEventMember |  |  |  |
Additional Common Stock And Warrants Issued to Investors |  |  | 2,264,450csbr_AdditionalCommonStockAndWarrantsIssuedToInvestors / csbr_AgreementAxis = csbr_SecuritiesPurchaseAgreementMember / us-gaap_SubsequentEventTypeAxis = us-gaap_SubsequentEventMember |  |  |  |
Subsequent Event [Member] | 2013 Securities Purchase Agreement [Member] |  |  |  |  |  |  |
Subsequent Event [Line Items] |  |  |  |  |  |  |
Additional Warrants Issued to Investors |  |  |  |  |  |  | 1,209,001csbr_AdditionalWarrantsIssuedToInvestors / csbr_AgreementAxis = csbr_SecuritiesPurchaseAgreementOneMember / us-gaap_SubsequentEventTypeAxis = us-gaap_SubsequentEventMember
Warrant Exercise Price |  |  |  |  |  |  | $ 0.40csbr_WarrantExercisePrice / csbr_AgreementAxis = csbr_SecuritiesPurchaseAgreementOneMember / us-gaap_SubsequentEventTypeAxis = us-gaap_SubsequentEventMember

X
- Definition Number of additional common stocks and warrants issued during the period for investors under securities purchase agreement. + References No definition available. + Details
Name: | csbr_AdditionalCommonStockAndWarrantsIssuedToInvestors
Namespace Prefix: | csbr_
Data Type: | xbrli:sharesItemType
Balance Type: | na
Period Type: | instant

X
- Definition Number of additional warrants issued during the period for investors under securities purchase agreement. + References No definition available. + Details
Name: | csbr_AdditionalWarrantsIssuedToInvestors
Namespace Prefix: | csbr_
Data Type: | xbrli:sharesItemType
Balance Type: | na
Period Type: | instant

X
- Definition Price of repurchased stock under put option. + References No definition available. + Details
Name: | csbr_RepurchaseOfStockInPutOption
Namespace Prefix: | csbr_
Data Type: | num:perShareItemType
Balance Type: | na
Period Type: | duration

X
- Definition Period of time between issuance and maturity of warrant, in PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days. + References No definition available. + Details
Name: | csbr_TermOfWarrants
Namespace Prefix: | csbr_
Data Type: | xbrli:durationItemType
Balance Type: | na
Period Type: | duration

X
- Definition This item represents that, the total number of shares and warrants and their respective prices of a unit contains of. + References No definition available. + Details
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Namespace Prefix: | csbr_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration

X
- Definition Exercise price of the warrants. + References No definition available. + Details
Name: | csbr_WarrantExercisePrice
Namespace Prefix: | csbr_
Data Type: | num:perShareItemType
Balance Type: | na
Period Type: | instant

X
- Definition The amount of the original debt being converted in a noncash (or part noncash) transaction. "Part noncash" refers to that portion of the transaction not resulting in cash receipts or cash payments in the period. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 50 -Paragraph 5 -URI http://asc.fasb.org/extlink&oid=6367179&loc=d3e4332-108586 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 50 -Paragraph 3 -URI http://asc.fasb.org/extlink&oid=6367179&loc=d3e4304-108586 + Details
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Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | duration

X
- Definition Number of new stock issued during the period. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 04 -Article 3 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 505 -SubTopic 10 -Section 50 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=6928386&loc=d3e21463-112644 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 505 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.3-04) -URI http://asc.fasb.org/extlink&oid=27012166&loc=d3e187085-122770 Reference 4: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 02 -Paragraph 29, 30 -Article 5 + Details
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Namespace Prefix: | us-gaap_
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Balance Type: | na
Period Type: | duration

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- Details
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Balance Type: | na
Period Type: | duration

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- Details
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Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

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- Details
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Namespace Prefix: |
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Balance Type: |
Period Type: |

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- Details
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Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |