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Disclosure of Share-based Compensation Arrangements by Share-based Payment Award (Details) (USD $)
 9 Months Ended
Jan. 31, 2015
Common Stock Disclosure Of Share-based Compensation Arrangements By Share-based Payment Award 1 $ 0.47cpah_DisclosureOfSharebasedCompensationArrangementsBySharebasedPaymentAwardZeroTwoSevenZeroZeroZerokfcSevenFiveEightchSrFiveD
Common Stock Disclosure Of Share-based Compensation Arrangements By Share-based Payment Award 2 122,750cpah_DisclosureOfSharebasedCompensationArrangementsBySharebasedPaymentAwardZeroTwoSevenZeroZeroZeroxtFourHDGcTwPlm
Common Stock Disclosure Of Share-based Compensation Arrangements By Share-based Payment Award 3 31,719cpah_DisclosureOfSharebasedCompensationArrangementsBySharebasedPaymentAwardZeroTwoSevenZeroZeroZeroFivedCGymfTwoyhwn
Common Stock Disclosure Of Share-based Compensation Arrangements By Share-based Payment Award 4 122,750cpah_DisclosureOfSharebasedCompensationArrangementsBySharebasedPaymentAwardZeroTwoSevenZeroZeroZeroVJNinefQHPGZeroKbl
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Common Stock Disclosure Of Share-based Compensation Arrangements By Share-based Payment Award 6 0.78cpah_DisclosureOfSharebasedCompensationArrangementsBySharebasedPaymentAwardZeroTwoSevenZeroZeroZeroEightQEightBrcRxnThreeGC
Common Stock Disclosure Of Share-based Compensation Arrangements By Share-based Payment Award 7 34,000cpah_DisclosureOfSharebasedCompensationArrangementsBySharebasedPaymentAwardZeroTwoSevenZeroZeroZeroZeroLsVmTwoSevenzfpwL
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Common Stock Disclosure Of Share-based Compensation Arrangements By Share-based Payment Award 17 700,000cpah_DisclosureOfSharebasedCompensationArrangementsBySharebasedPaymentAwardZeroTwoSevenZeroZeroZeroHFWLmCJwGHhm
Common Stock Disclosure Of Share-based Compensation Arrangements By Share-based Payment Award 18 0cpah_DisclosureOfSharebasedCompensationArrangementsBySharebasedPaymentAwardZeroTwoSevenZeroZeroZerolNJQZXKZMSLt
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Common Stock Disclosure Of Share-based Compensation Arrangements By Share-based Payment Award 22 20,833cpah_DisclosureOfSharebasedCompensationArrangementsBySharebasedPaymentAwardZeroTwoSevenZeroZeroZeroXlTFourmEightypSFiveGThree
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Common Stock Disclosure Of Share-based Compensation Arrangements By Share-based Payment Award 27 600,000cpah_DisclosureOfSharebasedCompensationArrangementsBySharebasedPaymentAwardZeroTwoSevenZeroZeroZerolFourZnrrmLtQWy
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Common Stock Disclosure Of Share-based Compensation Arrangements By Share-based Payment Award 30 0cpah_DisclosureOfSharebasedCompensationArrangementsBySharebasedPaymentAwardZeroTwoSevenZeroZeroZerocPLFThreeCQRlgcw
Common Stock Disclosure Of Share-based Compensation Arrangements By Share-based Payment Award 31 1.41cpah_DisclosureOfSharebasedCompensationArrangementsBySharebasedPaymentAwardZeroTwoSevenZeroZeroZeroThreeFourEightfBscGlbTwoN
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Common Stock Disclosure Of Share-based Compensation Arrangements By Share-based Payment Award 34 31,250cpah_DisclosureOfSharebasedCompensationArrangementsBySharebasedPaymentAwardZeroTwoSevenZeroZeroZerosThFourTwobOneFourxSevenPs
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Common Stock Disclosure Of Share-based Compensation Arrangements By Share-based Payment Award 36 1.70cpah_DisclosureOfSharebasedCompensationArrangementsBySharebasedPaymentAwardZeroTwoSevenZeroZeroZeroTwoSixPGvhTzdNTq
Common Stock Disclosure Of Share-based Compensation Arrangements By Share-based Payment Award 37 650,000cpah_DisclosureOfSharebasedCompensationArrangementsBySharebasedPaymentAwardZeroTwoSevenZeroZeroZeroFiveVCGyScmKvTwoOne
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Common Stock Disclosure Of Share-based Compensation Arrangements By Share-based Payment Award 42 845,000cpah_DisclosureOfSharebasedCompensationArrangementsBySharebasedPaymentAwardZeroTwoSevenZeroZeroZerowZeronTwozrxzBBwM
Common Stock Disclosure Of Share-based Compensation Arrangements By Share-based Payment Award 43 0cpah_DisclosureOfSharebasedCompensationArrangementsBySharebasedPaymentAwardZeroTwoSevenZeroZeroZerobqTKThreeZmWfMmd
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Common Stock Disclosure Of Share-based Compensation Arrangements By Share-based Payment Award 46 2.00cpah_DisclosureOfSharebasedCompensationArrangementsBySharebasedPaymentAwardZeroTwoSevenZeroZeroZeroSixThreeRlFourXXyTSBSeven
Common Stock Disclosure Of Share-based Compensation Arrangements By Share-based Payment Award 47 6,000cpah_DisclosureOfSharebasedCompensationArrangementsBySharebasedPaymentAwardZeroTwoSevenZeroZeroZerobsNinefStmdTwoPsw
Common Stock Disclosure Of Share-based Compensation Arrangements By Share-based Payment Award 48 0cpah_DisclosureOfSharebasedCompensationArrangementsBySharebasedPaymentAwardZeroTwoSevenZeroZeroZeroMwZNZeroSevenQNinePCPG
Common Stock Disclosure Of Share-based Compensation Arrangements By Share-based Payment Award 49 6,000cpah_DisclosureOfSharebasedCompensationArrangementsBySharebasedPaymentAwardZeroTwoSevenZeroZeroZerobZeroNSixqNRTFytOne
Common Stock Disclosure Of Share-based Compensation Arrangements By Share-based Payment Award 50 0cpah_DisclosureOfSharebasedCompensationArrangementsBySharebasedPaymentAwardZeroTwoSevenZeroZeroZerotHfMpFivelcJFdy
Common Stock Disclosure Of Share-based Compensation Arrangements By Share-based Payment Award 51 2.15cpah_DisclosureOfSharebasedCompensationArrangementsBySharebasedPaymentAwardZeroTwoSevenZeroZeroZerolwSevenCFiveJCdMCKB
Common Stock Disclosure Of Share-based Compensation Arrangements By Share-based Payment Award 52 240,000cpah_DisclosureOfSharebasedCompensationArrangementsBySharebasedPaymentAwardZeroTwoSevenZeroZeroZeroSevenPwbNtGKTbnNine
Common Stock Disclosure Of Share-based Compensation Arrangements By Share-based Payment Award 53 0cpah_DisclosureOfSharebasedCompensationArrangementsBySharebasedPaymentAwardZeroTwoSevenZeroZeroZerozdPSSixXFiveEightBlbF
Common Stock Disclosure Of Share-based Compensation Arrangements By Share-based Payment Award 54 240,000cpah_DisclosureOfSharebasedCompensationArrangementsBySharebasedPaymentAwardZeroTwoSevenZeroZeroZeroTwoVKRndFWXZeroys
Common Stock Disclosure Of Share-based Compensation Arrangements By Share-based Payment Award 55 0cpah_DisclosureOfSharebasedCompensationArrangementsBySharebasedPaymentAwardZeroTwoSevenZeroZeroZeroTgxBThreeSevenLvrCSevenS
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Common Stock Disclosure Of Share-based Compensation Arrangements By Share-based Payment Award 57 305,000cpah_DisclosureOfSharebasedCompensationArrangementsBySharebasedPaymentAwardZeroTwoSevenZeroZeroZerowFiveHNZGpFourvdThreeTwo
Common Stock Disclosure Of Share-based Compensation Arrangements By Share-based Payment Award 58 0cpah_DisclosureOfSharebasedCompensationArrangementsBySharebasedPaymentAwardZeroTwoSevenZeroZeroZerocvTwoJEightSrNpOneXw
Common Stock Disclosure Of Share-based Compensation Arrangements By Share-based Payment Award 59 190,625cpah_DisclosureOfSharebasedCompensationArrangementsBySharebasedPaymentAwardZeroTwoSevenZeroZeroZeroVVGzPgFiveDThreeWVw
Common Stock Disclosure Of Share-based Compensation Arrangements By Share-based Payment Award 60 0cpah_DisclosureOfSharebasedCompensationArrangementsBySharebasedPaymentAwardZeroTwoSevenZeroZeroZeroDKyEightCFvVKCGR
Common Stock Disclosure Of Share-based Compensation Arrangements By Share-based Payment Award 61 3,760,583cpah_DisclosureOfSharebasedCompensationArrangementsBySharebasedPaymentAwardZeroTwoSevenZeroZeroZeroPThreeRFmrKRBZerozp
Common Stock Disclosure Of Share-based Compensation Arrangements By Share-based Payment Award 62 31,719cpah_DisclosureOfSharebasedCompensationArrangementsBySharebasedPaymentAwardZeroTwoSevenZeroZeroZerohGOneCVtqFDzNineb
Common Stock Disclosure Of Share-based Compensation Arrangements By Share-based Payment Award 63 1,916,875cpah_DisclosureOfSharebasedCompensationArrangementsBySharebasedPaymentAwardZeroTwoSevenZeroZeroZerovVTtXdsKGSixPNine
Common Stock Disclosure Of Share-based Compensation Arrangements By Share-based Payment Award 64 31,719cpah_DisclosureOfSharebasedCompensationArrangementsBySharebasedPaymentAwardZeroTwoSevenZeroZeroZeroBFlEightWBtrTwoThreezz
Common Stock Disclosure Of Share-based Compensation Arrangements By Share-based Payment Award 65 3,705,539cpah_DisclosureOfSharebasedCompensationArrangementsBySharebasedPaymentAwardZeroTwoSevenZeroZeroZeroThreeBtmKBRNmFNineS
Common Stock Disclosure Of Share-based Compensation Arrangements By Share-based Payment Award 66 353,637cpah_DisclosureOfSharebasedCompensationArrangementsBySharebasedPaymentAwardZeroTwoSevenZeroZeroZeroSixpPqhFourThgHln
Common Stock Disclosure Of Share-based Compensation Arrangements By Share-based Payment Award 67 1,767,621cpah_DisclosureOfSharebasedCompensationArrangementsBySharebasedPaymentAwardZeroTwoSevenZeroZeroZeroFourtBrLqFourSevenkhrV
Common Stock Disclosure Of Share-based Compensation Arrangements By Share-based Payment Award 68 $ 332,137cpah_DisclosureOfSharebasedCompensationArrangementsBySharebasedPaymentAwardZeroTwoSevenZeroZeroZeroTwoCbXEightThreeRTwoqHKn