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UNAUDITED CONDENSED CONSOLIDATED STATEMENTS OF CASH FLOWS (USD $) In Thousands, unless otherwise specified | 6 Months Ended
--- | ---
Oct. 31, 2014 | Oct. 31, 2013
Operating activities: |  |
Net loss | $ (6,684)us-gaap_NetIncomeLoss | $ (4,556)us-gaap_NetIncomeLoss
Adjustments to reconcile net loss to net cash used in operating activities: |  |
Stock-based compensation expense | 1,627 us-gaap_ShareBasedCompensation | 1,028 us-gaap_ShareBasedCompensation
Depreciation expense | 110 us-gaap_DepreciationAndAmortization | 102 us-gaap_DepreciationAndAmortization
Change in fair value of warrant liability | (780)us-gaap_GainLossOnDerivativeInstrumentsNetPretax | 2,048 us-gaap_GainLossOnDerivativeInstrumentsNetPretax
Changes in operating assets and liabilities: |  |
Accounts receivable | 210 us-gaap_IncreaseDecreaseInAccountsReceivable | (962)us-gaap_IncreaseDecreaseInAccountsReceivable
Prepaid expenses, deposits and other | (10)us-gaap_IncreaseDecreaseInPrepaidDeferredExpenseAndOtherAssets | 96 us-gaap_IncreaseDecreaseInPrepaidDeferredExpenseAndOtherAssets
Restricted cash | 1 us-gaap_IncreaseDecreaseInRestrictedCash | (1)us-gaap_IncreaseDecreaseInRestrictedCash
Accounts payable | 651 us-gaap_IncreaseDecreaseInAccountsPayable | (220)us-gaap_IncreaseDecreaseInAccountsPayable
Accrued liabilities | (41)us-gaap_IncreaseDecreaseInAccruedLiabilities | (282)us-gaap_IncreaseDecreaseInAccruedLiabilities
Deferred revenue | (331)us-gaap_IncreaseDecreaseInDeferredRevenue | 845 us-gaap_IncreaseDecreaseInDeferredRevenue
Net cash used in operating activities | (5,247)us-gaap_NetCashProvidedByUsedInOperatingActivitiesContinuingOperations | (1,902)us-gaap_NetCashProvidedByUsedInOperatingActivitiesContinuingOperations
Investing activities: |  |
Purchase of property and equipment | (71)us-gaap_PaymentsToAcquirePropertyPlantAndEquipment | (76)us-gaap_PaymentsToAcquirePropertyPlantAndEquipment
Net cash used in investing activities | (71)us-gaap_NetCashProvidedByUsedInInvestingActivitiesContinuingOperations | (76)us-gaap_NetCashProvidedByUsedInInvestingActivitiesContinuingOperations
Financing activities: |  |
Proceeds from exercise of options | 2 csbr_ProceedsFromExerciseOfOptionsAndWarrants | 9 csbr_ProceedsFromExerciseOfOptionsAndWarrants
Net cash provided by financing activities | 2 us-gaap_NetCashProvidedByUsedInFinancingActivitiesContinuingOperations | 9 us-gaap_NetCashProvidedByUsedInFinancingActivitiesContinuingOperations
Exchange rate effect on cash and cash equivalents | 0 us-gaap_EffectOfExchangeRateOnCashAndCashEquivalents | (20)us-gaap_EffectOfExchangeRateOnCashAndCashEquivalents
Decrease in cash and cash equivalents | (5,316)us-gaap_CashAndCashEquivalentsPeriodIncreaseDecrease | (1,989)us-gaap_CashAndCashEquivalentsPeriodIncreaseDecrease
Cash and cash equivalents, beginning of period | 5,891 us-gaap_CashAndCashEquivalentsAtCarryingValue | 9,561 us-gaap_CashAndCashEquivalentsAtCarryingValue
Cash and cash equivalents, end of period | $ 575 us-gaap_CashAndCashEquivalentsAtCarryingValue | $ 7,572 us-gaap_CashAndCashEquivalentsAtCarryingValue

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- Definition Amount of currency on hand as well as demand deposits with banks or financial institutions. Includes other kinds of accounts that have the general characteristics of demand deposits. Also includes short-term, highly liquid investments that are both readily convertible to known amounts of cash and so near their maturity that they present insignificant risk of changes in value because of changes in interest rates. Excludes cash and cash equivalents within disposal group and discontinued operation. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Glossary Cash -URI http://asc.fasb.org/extlink&oid=6506951 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Glossary Cash Equivalents -URI http://asc.fasb.org/extlink&oid=6507016 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 02 -Paragraph 1 -Article 5 Reference 4: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02.1) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 Reference 5: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section 45 -Paragraph 1 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=28358313&loc=d3e6676-107765 Reference 6: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 4 -URI http://asc.fasb.org/extlink&oid=31042434&loc=d3e3044-108585 + Details
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