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Redeemable Common Stock and Stock Purchase Warrants (Details Textual) (USD $) | 1 Months Ended | 9 Months Ended | 12 Months Ended |
--- | --- | --- | --- | ---
Jan. 28, 2013 | Mar. 24, 2011 | Jan. 31, 2015 | Apr. 30, 2014 | Apr. 30, 2013
Common Stock Purchase Price | $ 0.50csbr_CommonStockPurchasePrice | $ 0.75csbr_CommonStockPurchasePrice |  |  |
Proceeds From Issuance Of Common Stock And Warrants | $ 9,100,000csbr_ProceedsFromIssuanceOfCommonStockAndWarrants |  |  |  |
Stock Issued During Period, Shares, Acquisitions | 18,600,000us-gaap_StockIssuedDuringPeriodSharesAcquisitions | 12,533,333us-gaap_StockIssuedDuringPeriodSharesAcquisitions |  |  |
Stock Issued During Period, Value, Share-based Compensation, Gross | 9,300,000us-gaap_StockIssuedDuringPeriodValueShareBasedCompensationGross | 9,400,000us-gaap_StockIssuedDuringPeriodValueShareBasedCompensationGross |  |  |
Stock Issued During Period, Value, Share-based Compensation, Forfeited | 500,000us-gaap_StockIssuedDuringPeriodValueShareBasedCompensationForfeited | 500,000us-gaap_StockIssuedDuringPeriodValueShareBasedCompensationForfeited |  |  |
Estimated Fair Value Of Warrants |  |  |  | 2,011,000csbr_EstimatedFairValueOfWarrants | 1,046,000csbr_EstimatedFairValueOfWarrants
Percentage Of Cash Penalties |  |  | 1.00%csbr_PercentageOfCashPenalties | 1.00%csbr_PercentageOfCashPenalties |
Purchase Price Limit Percentage |  |  | 10.00%csbr_PurchasePriceLimitPercentage | 10.00%csbr_PurchasePriceLimitPercentage |
Maximum [Member] |  |  |  |  |
Potential Penalties Amount |  |  | 130,000csbr_PotentialPenaltiesAmount / us-gaap_RangeAxis = us-gaap_MaximumMember | 130,000csbr_PotentialPenaltiesAmount / us-gaap_RangeAxis = us-gaap_MaximumMember |
Minimum [Member] |  |  |  |  |
Potential Penalties Amount |  |  | 50,000csbr_PotentialPenaltiesAmount / us-gaap_RangeAxis = us-gaap_MinimumMember | 50,000csbr_PotentialPenaltiesAmount / us-gaap_RangeAxis = us-gaap_MinimumMember |
January 2013 Private Placement [Member] |  |  |  |  |
Common Stock Purchase Price |  |  |  | $ 0.50csbr_CommonStockPurchasePrice / csbr_PrivatePlacementTypeAxis = csbr_January2013PrivatePlacementMember |
Proceeds From Issuance Of Common Stock And Warrants |  |  |  | 9,300,000csbr_ProceedsFromIssuanceOfCommonStockAndWarrants / csbr_PrivatePlacementTypeAxis = csbr_January2013PrivatePlacementMember |
Warrants Issued During Period For Common Stock |  |  |  | 1,860,000csbr_WarrantsIssuedDuringPeriodForCommonStock / csbr_PrivatePlacementTypeAxis = csbr_January2013PrivatePlacementMember |
Warrants Exercise Price Per Share |  |  |  | $ 0.66csbr_WarrantsExercisePricePerShare / csbr_PrivatePlacementTypeAxis = csbr_January2013PrivatePlacementMember |
Percentage Of Common Stock Purchased |  |  |  | 25.00%csbr_PercentageOfCommonStockPurchased / csbr_PrivatePlacementTypeAxis = csbr_January2013PrivatePlacementMember |
Share-based Compensation Arrangement by Share-based Payment Award, Shares Issued in Period |  |  |  | 1,064,658us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardSharesIssuedInPeriod / csbr_PrivatePlacementTypeAxis = csbr_January2013PrivatePlacementMember |
Net Shares Reclassified to Mandatorily Redeemable Capital Stock, Value |  |  |  | 8,800,000us-gaap_NetSharesReclassifiedToMandatorilyRedeemableCapitalStockValue / csbr_PrivatePlacementTypeAxis = csbr_January2013PrivatePlacementMember |
Proceeds from Issuance of Warrants |  |  |  | 400,000us-gaap_ProceedsFromIssuanceOfWarrants / csbr_PrivatePlacementTypeAxis = csbr_January2013PrivatePlacementMember |
Share-based Compensation Arrangement by Share-based Payment Award, Plan Modification, Incremental Compensation Cost |  |  |  | 200,000us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardPlanModificationIncrementalCompensationCost / csbr_PrivatePlacementTypeAxis = csbr_January2013PrivatePlacementMember |
Warrants and Rights Outstanding |  |  |  | 800,000us-gaap_WarrantsAndRightsOutstanding / csbr_PrivatePlacementTypeAxis = csbr_January2013PrivatePlacementMember |
April 2011 Private Placement [Member] |  |  |  |  |
Common Stock Purchase Price |  |  |  | $ 0.75csbr_CommonStockPurchasePrice / csbr_PrivatePlacementTypeAxis = csbr_April2011PrivatePlacementMember |
Proceeds From Issuance Of Common Stock And Warrants |  |  |  | 9,400,000csbr_ProceedsFromIssuanceOfCommonStockAndWarrants / csbr_PrivatePlacementTypeAxis = csbr_April2011PrivatePlacementMember |
Warrants Issued During Period For Common Stock |  |  |  | 1,266,667csbr_WarrantsIssuedDuringPeriodForCommonStock / csbr_PrivatePlacementTypeAxis = csbr_April2011PrivatePlacementMember |
Warrants Exercise Price Per Share |  |  |  | $ 0.90csbr_WarrantsExercisePricePerShare / csbr_PrivatePlacementTypeAxis = csbr_April2011PrivatePlacementMember |
Percentage Of Common Stock Purchased |  |  |  | 25.00%csbr_PercentageOfCommonStockPurchased / csbr_PrivatePlacementTypeAxis = csbr_April2011PrivatePlacementMember |
Net Shares Reclassified to Mandatorily Redeemable Capital Stock, Value |  |  |  | 8,200,000us-gaap_NetSharesReclassifiedToMandatorilyRedeemableCapitalStockValue / csbr_PrivatePlacementTypeAxis = csbr_April2011PrivatePlacementMember |
Proceeds from Issuance of Warrants |  |  |  | 900,000us-gaap_ProceedsFromIssuanceOfWarrants / csbr_PrivatePlacementTypeAxis = csbr_April2011PrivatePlacementMember |
Share-based Compensation Arrangement by Share-based Payment Award, Plan Modification, Incremental Compensation Cost |  |  |  | $ 300,000us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardPlanModificationIncrementalCompensationCost / csbr_PrivatePlacementTypeAxis = csbr_April2011PrivatePlacementMember |
April 2011 Private Placement [Member] | Maximum [Member] |  |  |  |  |
Warrants Exercise Price Per Share |  |  |  | $ 0.90csbr_WarrantsExercisePricePerShare / csbr_PrivatePlacementTypeAxis = csbr_April2011PrivatePlacementMember / us-gaap_RangeAxis = us-gaap_MaximumMember |
April 2011 Private Placement [Member] | Minimum [Member] |  |  |  |  |
Warrants Exercise Price Per Share |  |  |  | $ 0.50csbr_WarrantsExercisePricePerShare / csbr_PrivatePlacementTypeAxis = csbr_April2011PrivatePlacementMember / us-gaap_RangeAxis = us-gaap_MinimumMember |

X
- Definition The price per share at which the common stock purchased during the period. + References No definition available. + Details
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Balance Type: | na
Period Type: | duration

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- Definition The estimated fair value of warrants. + References No definition available. + Details
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Balance Type: | credit
Period Type: | instant

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- Definition Percentage of cash penalty equal to the aggregate purchase price paid by investor. + References No definition available. + Details
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Balance Type: | na
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- Definition The percentage of common stock purchased by investors. + References No definition available. + Details
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- Definition The total amount of potential penalties under this registration payment arrangement. + References No definition available. + Details
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- Definition The cash inflow from issuance of rights to purchase common shares at predetermined price and the additional capital contribution to the entity. + References No definition available. + Details
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- Definition Percentage describes the limit of the aggregate Purchase Price paid by the investors. + References No definition available. + Details
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- Definition The warrants exercise price per share. + References No definition available. + Details
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- Definition The number warrants issued during the period for purchase of common stock. + References No definition available. + Details
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- Definition Value of net shares reclassified to mandatorily redeemable capital stock. + References No definition available. + Details
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- Definition The cash inflow from issuance of rights to purchase common shares at predetermined price (usually issued together with corporate debt). + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Glossary Financing Activities -URI http://asc.fasb.org/extlink&oid=6513228 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 14 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=31042434&loc=d3e3255-108585 + Details
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- Definition An excess of the fair value of the modified award over the fair value of the award immediately before the modification. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (h)(2)(iii) -URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901 + Details
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- Definition Number of share instruments newly issued under a share-based compensation plan. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901 + Details
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- Definition Gross value of stock (or other type of equity) issued during the period as a result of any equity-based compensation plan other than an employee stock ownership plan (ESOP). Stock issued could result from the issuance of restricted stock, the exercise of stock options, stock issued under employee stock purchase plans, and/or other employee benefit plans. + References No definition available. + Details
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