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Organization, Use of Estimates and Basis of Presentation (Details) (USD $) | 3 Months Ended | 6 Months Ended
--- | --- | ---
Oct. 31, 2014 | Oct. 31, 2013 | Oct. 31, 2014 | Oct. 31, 2013
Basic loss per share computation |  |  |  |
Net loss attributable to common stockholders | $ (3,078,000)us-gaap_NetIncomeLoss | $ (2,318,000)us-gaap_NetIncomeLoss | $ (6,684,000)us-gaap_NetIncomeLoss | $ (4,556,000)us-gaap_NetIncomeLoss
Weighted Average common shares - basic | 66,887,331 us-gaap_WeightedAverageNumberOfSharesOutstandingBasic | 66,863,147 us-gaap_WeightedAverageNumberOfSharesOutstandingBasic | 66,886,234 us-gaap_WeightedAverageNumberOfSharesOutstandingBasic | 66,857,630 us-gaap_WeightedAverageNumberOfSharesOutstandingBasic
Basic net loss per share | $ (0.05)us-gaap_EarningsPerShareBasic | $ (0.03)us-gaap_EarningsPerShareBasic | $ (0.10)us-gaap_EarningsPerShareBasic | $ (0.07)us-gaap_EarningsPerShareBasic
Diluted loss per share computation |  |  |  |
Net loss attributable to common stockholders | (3,078,000)us-gaap_NetIncomeLoss | (2,318,000)us-gaap_NetIncomeLoss | (6,684,000)us-gaap_NetIncomeLoss | (4,556,000)us-gaap_NetIncomeLoss
Less: Gain on derivative warrant liability | 624,993 us-gaap_GainOnDerivativeInstrumentsPretax | 0 us-gaap_GainOnDerivativeInstrumentsPretax | 780,627 us-gaap_GainOnDerivativeInstrumentsPretax | 0 us-gaap_GainOnDerivativeInstrumentsPretax
Loss available to common stockholders | $ (3,702,993)us-gaap_NetIncomeLossAvailableToCommonStockholdersDiluted | $ (2,318,000)us-gaap_NetIncomeLossAvailableToCommonStockholdersDiluted | $ (7,464,627)us-gaap_NetIncomeLossAvailableToCommonStockholdersDiluted | $ (4,556,000)us-gaap_NetIncomeLossAvailableToCommonStockholdersDiluted
Weighted Average common shares | 66,887,331 us-gaap_WeightedAverageNumberOfSharesOutstandingBasic | 66,863,147 us-gaap_WeightedAverageNumberOfSharesOutstandingBasic | 66,886,234 us-gaap_WeightedAverageNumberOfSharesOutstandingBasic | 66,857,630 us-gaap_WeightedAverageNumberOfSharesOutstandingBasic
Incremental shares from assumed exercise of warrants and stock options | 967,994 csbr_StockIssuedDuringPeriodUponExerciseOfWarrantsAndStockOptions | 0 csbr_StockIssuedDuringPeriodUponExerciseOfWarrantsAndStockOptions | 967,994 csbr_StockIssuedDuringPeriodUponExerciseOfWarrantsAndStockOptions | 0 csbr_StockIssuedDuringPeriodUponExerciseOfWarrantsAndStockOptions
Adjusted weighted average share - diluted | 67,855,325 us-gaap_WeightedAverageNumberOfDilutedSharesOutstanding | 66,863,147 us-gaap_WeightedAverageNumberOfDilutedSharesOutstanding | 67,854,228 us-gaap_WeightedAverageNumberOfDilutedSharesOutstanding | 66,857,630 us-gaap_WeightedAverageNumberOfDilutedSharesOutstanding
Diluted net loss per share | $ (0.05)us-gaap_EarningsPerShareDiluted | $ (0.03)us-gaap_EarningsPerShareDiluted | $ (0.11)us-gaap_EarningsPerShareDiluted | $ (0.07)us-gaap_EarningsPerShareDiluted

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