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Organization, Use of Estimates and Basis of Presentation (Details Textual) (USD $) | 0 Months Ended | 3 Months Ended | 9 Months Ended | 12 Months Ended | 0 Months Ended |
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Dec. 01, 2014 | Jan. 31, 2015 | Jan. 31, 2014 | Jan. 31, 2015 | Jan. 31, 2014 | Apr. 30, 2014 | Apr. 30, 2013 | Mar. 13, 2015 | Mar. 11, 2015 | Apr. 30, 2012
Cash and Cash Equivalents, at Carrying Value, Total |  | $ 182,000us-gaap_CashAndCashEquivalentsAtCarryingValue | $ 5,812,000us-gaap_CashAndCashEquivalentsAtCarryingValue | $ 182,000us-gaap_CashAndCashEquivalentsAtCarryingValue | $ 5,812,000us-gaap_CashAndCashEquivalentsAtCarryingValue | $ 5,891,000us-gaap_CashAndCashEquivalentsAtCarryingValue | $ 9,561,000us-gaap_CashAndCashEquivalentsAtCarryingValue |  |  | $ 4,754,000us-gaap_CashAndCashEquivalentsAtCarryingValue
Working Capital (Deficit) |  | 4,700,000csbr_WorkingCapitalDeficit |  | 4,700,000csbr_WorkingCapitalDeficit |  |  |  |  |  |
Income Tax Expense (Benefit) |  | 12,000us-gaap_IncomeTaxExpenseBenefit | 5,000us-gaap_IncomeTaxExpenseBenefit | 27,000us-gaap_IncomeTaxExpenseBenefit | 13,000us-gaap_IncomeTaxExpenseBenefit | 17,000us-gaap_IncomeTaxExpenseBenefit | 10,000us-gaap_IncomeTaxExpenseBenefit |  |  |
Term Of Warrants | 5 years |  |  |  |  |  |  |  |  |
Common Stock, Par or Stated Value Per Share |  | $ 0.001us-gaap_CommonStockParOrStatedValuePerShare |  | $ 0.001us-gaap_CommonStockParOrStatedValuePerShare |  | $ 0.001us-gaap_CommonStockParOrStatedValuePerShare | $ 0.001us-gaap_CommonStockParOrStatedValuePerShare |  |  |
Subsequent Event [Member] |  |  |  |  |  |  |  |  |  |
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 |
Aggregate Value Of Units Issued |  |  |  |  |  |  |  |  | $ 14,000,000csbr_AggregateValueOfUnitsIssued / us-gaap_SubsequentEventTypeAxis = us-gaap_SubsequentEventMember |
Subsequent Event [Member] | Common Stock [Member] |  |  |  |  |  |  |  |  |  |
Common Stock, Par or Stated Value Per Share |  |  |  |  |  |  |  |  | $ 0.001us-gaap_CommonStockParOrStatedValuePerShare / us-gaap_StatementEquityComponentsAxis = us-gaap_CommonStockMember / us-gaap_SubsequentEventTypeAxis = us-gaap_SubsequentEventMember |
Shares Issued, Price Per Share |  |  |  |  |  |  |  |  | $ 0.48us-gaap_SharesIssuedPricePerShare / us-gaap_StatementEquityComponentsAxis = us-gaap_CommonStockMember / us-gaap_SubsequentEventTypeAxis = us-gaap_SubsequentEventMember |
Subsequent Event [Member] | Warrant [Member] |  |  |  |  |  |  |  |  |  |
Class of Warrant or Right, Number of Securities Called by Each Warrant or Right |  |  |  |  |  |  |  |  | 0.55us-gaap_ClassOfWarrantOrRightNumberOfSecuritiesCalledByEachWarrantOrRight / us-gaap_StatementEquityComponentsAxis = us-gaap_WarrantMember / us-gaap_SubsequentEventTypeAxis = us-gaap_SubsequentEventMember |
Class of Warrant or Right, Exercise Price of Warrants or Rights |  |  |  |  |  |  |  |  | $ 0.40us-gaap_ClassOfWarrantOrRightExercisePriceOfWarrantsOrRights1 / us-gaap_StatementEquityComponentsAxis = us-gaap_WarrantMember / us-gaap_SubsequentEventTypeAxis = us-gaap_SubsequentEventMember |

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