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Segment Information (Details) (USD $) In Thousands, unless otherwise specified	3 Months Ended				6 Months Ended
	Oct. 31, 2014		Oct. 31, 2013		Oct. 31, 2014		Oct. 31, 2013
Net revenue	$ 1,882us-gaap_SalesRevenueServicesNet		$ 2,383us-gaap_SalesRevenueServicesNet		$ 3,793us-gaap_SalesRevenueServicesNet		$ 5,403us-gaap_SalesRevenueServicesNet
Sales and marketing costs	(1,203)us-gaap_SellingAndMarketingExpense		(698)us-gaap_SellingAndMarketingExpense		(2,246)us-gaap_SellingAndMarketingExpense		(1,340)us-gaap_SellingAndMarketingExpense
Stock- based compensation expense	(820)us-gaap_AllocatedShareBasedCompensationExpense		(476)us-gaap_AllocatedShareBasedCompensationExpense		(1,627)us-gaap_AllocatedShareBasedCompensationExpense		(1,028)us-gaap_AllocatedShareBasedCompensationExpense
Personalized Oncology Solutions [Member]
Net revenue	452us-gaap_SalesRevenueServicesNet / us-gaap_StatementBusinessSegmentsAxis = csbr_PersonalizedOncologySolutionsMember		623us-gaap_SalesRevenueServicesNet / us-gaap_StatementBusinessSegmentsAxis = csbr_PersonalizedOncologySolutionsMember		792us-gaap_SalesRevenueServicesNet / us-gaap_StatementBusinessSegmentsAxis = csbr_PersonalizedOncologySolutionsMember		1,245us-gaap_SalesRevenueServicesNet / us-gaap_StatementBusinessSegmentsAxis = csbr_PersonalizedOncologySolutionsMember
Direct cost of services	(745)us-gaap_CostOfServices / us-gaap_StatementBusinessSegmentsAxis = csbr_PersonalizedOncologySolutionsMember		(726)us-gaap_CostOfServices / us-gaap_StatementBusinessSegmentsAxis = csbr_PersonalizedOncologySolutionsMember		(1,498)us-gaap_CostOfServices / us-gaap_StatementBusinessSegmentsAxis = csbr_PersonalizedOncologySolutionsMember		(1,470)us-gaap_CostOfServices / us-gaap_StatementBusinessSegmentsAxis = csbr_PersonalizedOncologySolutionsMember
Sales and marketing costs	(423)us-gaap_SellingAndMarketingExpense / us-gaap_StatementBusinessSegmentsAxis = csbr_PersonalizedOncologySolutionsMember		(423)us-gaap_SellingAndMarketingExpense / us-gaap_StatementBusinessSegmentsAxis = csbr_PersonalizedOncologySolutionsMember		(877)us-gaap_SellingAndMarketingExpense / us-gaap_StatementBusinessSegmentsAxis = csbr_PersonalizedOncologySolutionsMember		(754)us-gaap_SellingAndMarketingExpense / us-gaap_StatementBusinessSegmentsAxis = csbr_PersonalizedOncologySolutionsMember
Other operating expenses	0us-gaap_OtherOperatingIncomeExpenseNet / us-gaap_StatementBusinessSegmentsAxis = csbr_PersonalizedOncologySolutionsMember		0us-gaap_OtherOperatingIncomeExpenseNet / us-gaap_StatementBusinessSegmentsAxis = csbr_PersonalizedOncologySolutionsMember		0us-gaap_OtherOperatingIncomeExpenseNet / us-gaap_StatementBusinessSegmentsAxis = csbr_PersonalizedOncologySolutionsMember		0us-gaap_OtherOperatingIncomeExpenseNet / us-gaap_StatementBusinessSegmentsAxis = csbr_PersonalizedOncologySolutionsMember
Stock- based compensation expense	0us-gaap_AllocatedShareBasedCompensationExpense / us-gaap_StatementBusinessSegmentsAxis = csbr_PersonalizedOncologySolutionsMember	[1]	0us-gaap_AllocatedShareBasedCompensationExpense / us-gaap_StatementBusinessSegmentsAxis = csbr_PersonalizedOncologySolutionsMember	[1]	0us-gaap_AllocatedShareBasedCompensationExpense / us-gaap_StatementBusinessSegmentsAxis = csbr_PersonalizedOncologySolutionsMember	[1]	0us-gaap_AllocatedShareBasedCompensationExpense / us-gaap_StatementBusinessSegmentsAxis = csbr_PersonalizedOncologySolutionsMember	[1]
Segment profit (loss)	(716)us-gaap_ProfitLoss / us-gaap_StatementBusinessSegmentsAxis = csbr_PersonalizedOncologySolutionsMember		(526)us-gaap_ProfitLoss / us-gaap_StatementBusinessSegmentsAxis = csbr_PersonalizedOncologySolutionsMember		(1,583)us-gaap_ProfitLoss / us-gaap_StatementBusinessSegmentsAxis = csbr_PersonalizedOncologySolutionsMember		(979)us-gaap_ProfitLoss / us-gaap_StatementBusinessSegmentsAxis = csbr_PersonalizedOncologySolutionsMember
Translational Oncology Solutions [Member]
Net revenue	1,430us-gaap_SalesRevenueServicesNet / us-gaap_StatementBusinessSegmentsAxis = csbr_TranslationalOncologySolutionsMember		1,760us-gaap_SalesRevenueServicesNet / us-gaap_StatementBusinessSegmentsAxis = csbr_TranslationalOncologySolutionsMember		3,001us-gaap_SalesRevenueServicesNet / us-gaap_StatementBusinessSegmentsAxis = csbr_TranslationalOncologySolutionsMember		4,158us-gaap_SalesRevenueServicesNet / us-gaap_StatementBusinessSegmentsAxis = csbr_TranslationalOncologySolutionsMember
Direct cost of services	(943)us-gaap_CostOfServices / us-gaap_StatementBusinessSegmentsAxis = csbr_TranslationalOncologySolutionsMember		(696)us-gaap_CostOfServices / us-gaap_StatementBusinessSegmentsAxis = csbr_TranslationalOncologySolutionsMember		(1,905)us-gaap_CostOfServices / us-gaap_StatementBusinessSegmentsAxis = csbr_TranslationalOncologySolutionsMember		(1,566)us-gaap_CostOfServices / us-gaap_StatementBusinessSegmentsAxis = csbr_TranslationalOncologySolutionsMember
Sales and marketing costs	(611)us-gaap_SellingAndMarketingExpense / us-gaap_StatementBusinessSegmentsAxis = csbr_TranslationalOncologySolutionsMember		(213)us-gaap_SellingAndMarketingExpense / us-gaap_StatementBusinessSegmentsAxis = csbr_TranslationalOncologySolutionsMember		(1,036)us-gaap_SellingAndMarketingExpense / us-gaap_StatementBusinessSegmentsAxis = csbr_TranslationalOncologySolutionsMember		(460)us-gaap_SellingAndMarketingExpense / us-gaap_StatementBusinessSegmentsAxis = csbr_TranslationalOncologySolutionsMember
Other operating expenses	(1,142)us-gaap_OtherOperatingIncomeExpenseNet / us-gaap_StatementBusinessSegmentsAxis = csbr_TranslationalOncologySolutionsMember		(673)us-gaap_OtherOperatingIncomeExpenseNet / us-gaap_StatementBusinessSegmentsAxis = csbr_TranslationalOncologySolutionsMember		(2,460)us-gaap_OtherOperatingIncomeExpenseNet / us-gaap_StatementBusinessSegmentsAxis = csbr_TranslationalOncologySolutionsMember		(1,063)us-gaap_OtherOperatingIncomeExpenseNet / us-gaap_StatementBusinessSegmentsAxis = csbr_TranslationalOncologySolutionsMember
Stock- based compensation expense	0us-gaap_AllocatedShareBasedCompensationExpense / us-gaap_StatementBusinessSegmentsAxis = csbr_TranslationalOncologySolutionsMember	[1]	0us-gaap_AllocatedShareBasedCompensationExpense / us-gaap_StatementBusinessSegmentsAxis = csbr_TranslationalOncologySolutionsMember	[1]	0us-gaap_AllocatedShareBasedCompensationExpense / us-gaap_StatementBusinessSegmentsAxis = csbr_TranslationalOncologySolutionsMember	[1]	0us-gaap_AllocatedShareBasedCompensationExpense / us-gaap_StatementBusinessSegmentsAxis = csbr_TranslationalOncologySolutionsMember	[1]
Segment profit (loss)	(1,266)us-gaap_ProfitLoss / us-gaap_StatementBusinessSegmentsAxis = csbr_TranslationalOncologySolutionsMember		178us-gaap_ProfitLoss / us-gaap_StatementBusinessSegmentsAxis = csbr_TranslationalOncologySolutionsMember		(2,400)us-gaap_ProfitLoss / us-gaap_StatementBusinessSegmentsAxis = csbr_TranslationalOncologySolutionsMember		1,069us-gaap_ProfitLoss / us-gaap_StatementBusinessSegmentsAxis = csbr_TranslationalOncologySolutionsMember
Unallocated Corporate Overhead [Member]
Net revenue	0us-gaap_SalesRevenueServicesNet / us-gaap_StatementBusinessSegmentsAxis = csbr_UnallocatedCorporateOverheadMember		0us-gaap_SalesRevenueServicesNet / us-gaap_StatementBusinessSegmentsAxis = csbr_UnallocatedCorporateOverheadMember		0us-gaap_SalesRevenueServicesNet / us-gaap_StatementBusinessSegmentsAxis = csbr_UnallocatedCorporateOverheadMember		0us-gaap_SalesRevenueServicesNet / us-gaap_StatementBusinessSegmentsAxis = csbr_UnallocatedCorporateOverheadMember
Direct cost of services	0us-gaap_CostOfServices / us-gaap_StatementBusinessSegmentsAxis = csbr_UnallocatedCorporateOverheadMember		0us-gaap_CostOfServices / us-gaap_StatementBusinessSegmentsAxis = csbr_UnallocatedCorporateOverheadMember		0us-gaap_CostOfServices / us-gaap_StatementBusinessSegmentsAxis = csbr_UnallocatedCorporateOverheadMember		0us-gaap_CostOfServices / us-gaap_StatementBusinessSegmentsAxis = csbr_UnallocatedCorporateOverheadMember
Sales and marketing costs	0us-gaap_SellingAndMarketingExpense / us-gaap_StatementBusinessSegmentsAxis = csbr_UnallocatedCorporateOverheadMember		0us-gaap_SellingAndMarketingExpense / us-gaap_StatementBusinessSegmentsAxis = csbr_UnallocatedCorporateOverheadMember		0us-gaap_SellingAndMarketingExpense / us-gaap_StatementBusinessSegmentsAxis = csbr_UnallocatedCorporateOverheadMember		0us-gaap_SellingAndMarketingExpense / us-gaap_StatementBusinessSegmentsAxis = csbr_UnallocatedCorporateOverheadMember
Other operating expenses	(864)us-gaap_OtherOperatingIncomeExpenseNet / us-gaap_StatementBusinessSegmentsAxis = csbr_UnallocatedCorporateOverheadMember		(877)us-gaap_OtherOperatingIncomeExpenseNet / us-gaap_StatementBusinessSegmentsAxis = csbr_UnallocatedCorporateOverheadMember		(1,777)us-gaap_OtherOperatingIncomeExpenseNet / us-gaap_StatementBusinessSegmentsAxis = csbr_UnallocatedCorporateOverheadMember		(1,534)us-gaap_OtherOperatingIncomeExpenseNet / us-gaap_StatementBusinessSegmentsAxis = csbr_UnallocatedCorporateOverheadMember
Stock- based compensation expense	(820)us-gaap_AllocatedShareBasedCompensationExpense / us-gaap_StatementBusinessSegmentsAxis = csbr_UnallocatedCorporateOverheadMember	[1]	(476)us-gaap_AllocatedShareBasedCompensationExpense / us-gaap_StatementBusinessSegmentsAxis = csbr_UnallocatedCorporateOverheadMember	[1]	(1,627)us-gaap_AllocatedShareBasedCompensationExpense / us-gaap_StatementBusinessSegmentsAxis = csbr_UnallocatedCorporateOverheadMember	[1]	(1,028)us-gaap_AllocatedShareBasedCompensationExpense / us-gaap_StatementBusinessSegmentsAxis = csbr_UnallocatedCorporateOverheadMember	[1]
Segment profit (loss)	(1,684)us-gaap_ProfitLoss / us-gaap_StatementBusinessSegmentsAxis = csbr_UnallocatedCorporateOverheadMember		(1,353)us-gaap_ProfitLoss / us-gaap_StatementBusinessSegmentsAxis = csbr_UnallocatedCorporateOverheadMember		(3,404)us-gaap_ProfitLoss / us-gaap_StatementBusinessSegmentsAxis = csbr_UnallocatedCorporateOverheadMember		(2,562)us-gaap_ProfitLoss / us-gaap_StatementBusinessSegmentsAxis = csbr_UnallocatedCorporateOverheadMember
Consolidated [Member]
Net revenue	1,882us-gaap_SalesRevenueServicesNet / us-gaap_StatementBusinessSegmentsAxis = csbr_ConsolidatedMember		2,383us-gaap_SalesRevenueServicesNet / us-gaap_StatementBusinessSegmentsAxis = csbr_ConsolidatedMember		3,793us-gaap_SalesRevenueServicesNet / us-gaap_StatementBusinessSegmentsAxis = csbr_ConsolidatedMember		5,403us-gaap_SalesRevenueServicesNet / us-gaap_StatementBusinessSegmentsAxis = csbr_ConsolidatedMember
Direct cost of services	(1,688)us-gaap_CostOfServices / us-gaap_StatementBusinessSegmentsAxis = csbr_ConsolidatedMember		(1,422)us-gaap_CostOfServices / us-gaap_StatementBusinessSegmentsAxis = csbr_ConsolidatedMember		(3,403)us-gaap_CostOfServices / us-gaap_StatementBusinessSegmentsAxis = csbr_ConsolidatedMember		(3,036)us-gaap_CostOfServices / us-gaap_StatementBusinessSegmentsAxis = csbr_ConsolidatedMember
Sales and marketing costs	(1,034)us-gaap_SellingAndMarketingExpense / us-gaap_StatementBusinessSegmentsAxis = csbr_ConsolidatedMember		(636)us-gaap_SellingAndMarketingExpense / us-gaap_StatementBusinessSegmentsAxis = csbr_ConsolidatedMember		(1,913)us-gaap_SellingAndMarketingExpense / us-gaap_StatementBusinessSegmentsAxis = csbr_ConsolidatedMember		(1,214)us-gaap_SellingAndMarketingExpense / us-gaap_StatementBusinessSegmentsAxis = csbr_ConsolidatedMember
Other operating expenses	(2,006)us-gaap_OtherOperatingIncomeExpenseNet / us-gaap_StatementBusinessSegmentsAxis = csbr_ConsolidatedMember		(1,550)us-gaap_OtherOperatingIncomeExpenseNet / us-gaap_StatementBusinessSegmentsAxis = csbr_ConsolidatedMember		(4,237)us-gaap_OtherOperatingIncomeExpenseNet / us-gaap_StatementBusinessSegmentsAxis = csbr_ConsolidatedMember		(2,597)us-gaap_OtherOperatingIncomeExpenseNet / us-gaap_StatementBusinessSegmentsAxis = csbr_ConsolidatedMember
Stock- based compensation expense	(820)us-gaap_AllocatedShareBasedCompensationExpense / us-gaap_StatementBusinessSegmentsAxis = csbr_ConsolidatedMember	[1]	(476)us-gaap_AllocatedShareBasedCompensationExpense / us-gaap_StatementBusinessSegmentsAxis = csbr_ConsolidatedMember	[1]	(1,627)us-gaap_AllocatedShareBasedCompensationExpense / us-gaap_StatementBusinessSegmentsAxis = csbr_ConsolidatedMember	[1]	(1,028)us-gaap_AllocatedShareBasedCompensationExpense / us-gaap_StatementBusinessSegmentsAxis = csbr_ConsolidatedMember	[1]
Segment profit (loss)	$ (3,666)us-gaap_ProfitLoss / us-gaap_StatementBusinessSegmentsAxis = csbr_ConsolidatedMember		$ (1,701)us-gaap_ProfitLoss / us-gaap_StatementBusinessSegmentsAxis = csbr_ConsolidatedMember		$ (7,387)us-gaap_ProfitLoss / us-gaap_StatementBusinessSegmentsAxis = csbr_ConsolidatedMember		$ (2,472)us-gaap_ProfitLoss / us-gaap_StatementBusinessSegmentsAxis = csbr_ConsolidatedMember
[1] Stock compensation expense is shown separately and is excluded from direct costs of services, sales and marketing costs, and other operating expenses, as it is managed on a consolidated basis and is not used by management to evaluate the performance of its segments.

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.

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Total costs related to services rendered by an entity during the reporting period.

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The consolidated profit or loss for the period, net of income taxes, including the portion attributable to the noncontrolling interest.

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Aggregate revenue during the period from services rendered in the normal course of business, after deducting allowances and discounts.

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The aggregate total amount of expenses directly related to the marketing or selling of products or services.

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No definition available.

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