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CONDENSED CONSOLIDATED STATEMENTS OF CASH FLOWS (Unaudited) (USD $)
 9 Months Ended
Jan. 31, 2015
Jan. 31, 2014
CASH FLOWS FROM OPERATING ACTIVITIES:    
Net loss $ (38,223,000)us-gaap_NetIncomeLoss $ (25,114,000)us-gaap_NetIncomeLoss
Adjustments to reconcile net loss to net cash used in operating activities:    
Share-based compensation 5,280,000us-gaap_ShareBasedCompensation 4,914,000us-gaap_ShareBasedCompensation
Depreciation and amortization 803,000us-gaap_DepreciationDepletionAndAmortization 737,000us-gaap_DepreciationDepletionAndAmortization
Loss on disposal of property and equipment 1,000us-gaap_GainLossOnDispositionOfAssets 4,000us-gaap_GainLossOnDispositionOfAssets
Changes in operating assets and liabilities:    
Trade and other receivables, net (4,952,000)us-gaap_IncreaseDecreaseInReceivables (1,120,000)us-gaap_IncreaseDecreaseInReceivables
Inventories (618,000)us-gaap_IncreaseDecreaseInInventories (885,000)us-gaap_IncreaseDecreaseInInventories
Prepaid expenses and other current assets, net 485,000us-gaap_IncreaseDecreaseInPrepaidDeferredExpenseAndOtherAssets (341,000)us-gaap_IncreaseDecreaseInPrepaidDeferredExpenseAndOtherAssets
Other non-current assets (1,000)us-gaap_IncreaseDecreaseInOtherNoncurrentAssets (50,000)us-gaap_IncreaseDecreaseInOtherNoncurrentAssets
Accounts payable 1,870,000us-gaap_IncreaseDecreaseInAccountsPayable (976,000)us-gaap_IncreaseDecreaseInAccountsPayable
Accrued clinical trial and related fees (1,316,000)us-gaap_IncreaseDecreaseInOtherAccruedLiabilities 428,000us-gaap_IncreaseDecreaseInOtherAccruedLiabilities
Accrued payroll and related expenses (121,000)us-gaap_IncreaseDecreaseInEmployeeRelatedLiabilities (273,000)us-gaap_IncreaseDecreaseInEmployeeRelatedLiabilities
Deferred revenue 219,000us-gaap_IncreaseDecreaseInDeferredRevenue 158,000us-gaap_IncreaseDecreaseInDeferredRevenue
Customer deposits 2,551,000us-gaap_IncreaseDecreaseInCustomerAdvances 587,000us-gaap_IncreaseDecreaseInCustomerAdvances
Other accrued expenses and current liabilities 1,000us-gaap_IncreaseDecreaseInOtherCurrentLiabilities 258,000us-gaap_IncreaseDecreaseInOtherCurrentLiabilities
Other long-term liabilities 410,000us-gaap_IncreaseDecreaseInOtherNoncurrentAssetsAndLiabilitiesNet (72,000)us-gaap_IncreaseDecreaseInOtherNoncurrentAssetsAndLiabilitiesNet
Net cash used in operating activities (33,611,000)us-gaap_NetCashProvidedByUsedInOperatingActivitiesContinuingOperations (21,745,000)us-gaap_NetCashProvidedByUsedInOperatingActivitiesContinuingOperations
CASH FLOWS FROM INVESTING ACTIVITIES:    
Property and equipment acquisitions (4,805,000)us-gaap_PaymentsToAcquirePropertyPlantAndEquipment (543,000)us-gaap_PaymentsToAcquirePropertyPlantAndEquipment
Decrease (increase) in other assets 1,139,000us-gaap_IncreaseDecreaseInOtherCurrentAssets (1,222,000)us-gaap_IncreaseDecreaseInOtherCurrentAssets
Net cash used in investing activities (3,666,000)us-gaap_NetCashProvidedByUsedInInvestingActivitiesContinuingOperations (1,765,000)us-gaap_NetCashProvidedByUsedInInvestingActivitiesContinuingOperations
CASH FLOWS FROM FINANCING ACTIVITIES:    
Proceeds from issuance of common stock, net of issuance costs of $193,000 and $1,427,000, respectively 7,205,000us-gaap_ProceedsFromIssuanceOfCommonStock 50,980,000us-gaap_ProceedsFromIssuanceOfCommonStock
Proceeds from issuance of Series E preferred stock, net of issuance costs of $553,000 9,567,000us-gaap_ProceedsFromIssuanceOfPreferredStockAndPreferenceStock 0us-gaap_ProceedsFromIssuanceOfPreferredStockAndPreferenceStock
Proceeds from issuance of common stock under Employee Stock Purchase Plan 307,000us-gaap_ProceedsFromIssuanceOfSharesUnderIncentiveAndShareBasedCompensationPlansIncludingStockOptions 282,000us-gaap_ProceedsFromIssuanceOfSharesUnderIncentiveAndShareBasedCompensationPlansIncludingStockOptions
Proceeds from exercise of stock options, net of issuance costs of $3,000 and nil, respectively 277,000us-gaap_ProceedsFromStockOptionsExercised 249,000us-gaap_ProceedsFromStockOptionsExercised
Dividends paid on preferred stock (2,318,000)us-gaap_PaymentsOfDividendsPreferredStockAndPreferenceStock 0us-gaap_PaymentsOfDividendsPreferredStockAndPreferenceStock
Principal payments on capital leases (13,000)us-gaap_RepaymentsOfLongTermCapitalLeaseObligations (28,000)us-gaap_RepaymentsOfLongTermCapitalLeaseObligations
Net cash provided by financing activities 15,025,000us-gaap_NetCashProvidedByUsedInFinancingActivitiesContinuingOperations 51,483,000us-gaap_NetCashProvidedByUsedInFinancingActivitiesContinuingOperations
NET (DECREASE) INCREASE IN CASH AND CASH EQUIVALENTS (22,252,000)us-gaap_CashAndCashEquivalentsPeriodIncreaseDecrease 27,973,000us-gaap_CashAndCashEquivalentsPeriodIncreaseDecrease
CASH AND CASH EQUIVALENTS, beginning of period 77,490,000us-gaap_CashAndCashEquivalentsAtCarryingValue 35,204,000us-gaap_CashAndCashEquivalentsAtCarryingValue
CASH AND CASH EQUIVALENTS, end of period 55,238,000us-gaap_CashAndCashEquivalentsAtCarryingValue 63,177,000us-gaap_CashAndCashEquivalentsAtCarryingValue
SCHEDULE OF NON-CASH INVESTING AND FINANCING ACTIVITIES:    
Accounts payable for purchase of property and equipment 2,510,000us-gaap_CapitalExpendituresIncurredButNotYetPaid 34,000us-gaap_CapitalExpendituresIncurredButNotYetPaid
Lease incentives $ 370,000pphm_LeaseIncentives $ 0pphm_LeaseIncentives