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Financial Instruments (Details) (USD $)
In Thousands, unless otherwise specified
Mar. 31, 2015
Jun. 30, 2014
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]    
Short-term investments $ 3,942us-gaap_ShortTermInvestments $ 10,822us-gaap_ShortTermInvestments
Fair Value, Inputs, Level 1 [Member]    
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]    
Short-term investments 66us-gaap_ShortTermInvestments
/ us-gaap_FairValueByFairValueHierarchyLevelAxis
= us-gaap_FairValueInputsLevel1Member		 96us-gaap_ShortTermInvestments
/ us-gaap_FairValueByFairValueHierarchyLevelAxis
= us-gaap_FairValueInputsLevel1Member
Fair Value, Inputs, Level 2 [Member]    
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]    
Short-term investments 3,876us-gaap_ShortTermInvestments
/ us-gaap_FairValueByFairValueHierarchyLevelAxis
= us-gaap_FairValueInputsLevel2Member		 10,726us-gaap_ShortTermInvestments
/ us-gaap_FairValueByFairValueHierarchyLevelAxis
= us-gaap_FairValueInputsLevel2Member
Fair Value, Inputs, Level 3 [Member]    
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]    
Short-term investments      
Mutual Funds [Member]    
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]    
Short-term investments 66us-gaap_ShortTermInvestments
/ us-gaap_FairValueByAssetClassAxis
= prcp_MutualFundsMember		 96us-gaap_ShortTermInvestments
/ us-gaap_FairValueByAssetClassAxis
= prcp_MutualFundsMember
Mutual Funds [Member] | Fair Value, Inputs, Level 1 [Member]    
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]    
Short-term investments 66us-gaap_ShortTermInvestments
/ us-gaap_FairValueByAssetClassAxis
= prcp_MutualFundsMember
/ us-gaap_FairValueByFairValueHierarchyLevelAxis
= us-gaap_FairValueInputsLevel1Member		 96us-gaap_ShortTermInvestments
/ us-gaap_FairValueByAssetClassAxis
= prcp_MutualFundsMember
/ us-gaap_FairValueByFairValueHierarchyLevelAxis
= us-gaap_FairValueInputsLevel1Member
Mutual Funds [Member] | Fair Value, Inputs, Level 3 [Member]    
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]    
Short-term investments      
Fixed Deposits And Certificates Of Deposit [Member]    
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]    
Short-term investments 3,876us-gaap_ShortTermInvestments
/ us-gaap_FairValueByAssetClassAxis
= us-gaap_BankTimeDepositsMember		 9,165us-gaap_ShortTermInvestments
/ us-gaap_FairValueByAssetClassAxis
= us-gaap_BankTimeDepositsMember
Fixed Deposits And Certificates Of Deposit [Member] | Fair Value, Inputs, Level 2 [Member]    
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]    
Short-term investments 3,876us-gaap_ShortTermInvestments
/ us-gaap_FairValueByAssetClassAxis
= us-gaap_BankTimeDepositsMember
/ us-gaap_FairValueByFairValueHierarchyLevelAxis
= us-gaap_FairValueInputsLevel2Member		 9,165us-gaap_ShortTermInvestments
/ us-gaap_FairValueByAssetClassAxis
= us-gaap_BankTimeDepositsMember
/ us-gaap_FairValueByFairValueHierarchyLevelAxis
= us-gaap_FairValueInputsLevel2Member
Fixed Deposits And Certificates Of Deposit [Member] | Fair Value, Inputs, Level 3 [Member]    
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]    
Short-term investments      
Variable Rate Demand Obligation [Member]    
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]    
Short-term investments   1,325us-gaap_ShortTermInvestments
/ us-gaap_FairValueByAssetClassAxis
= us-gaap_VariableRateDemandObligationMember
Variable Rate Demand Obligation [Member] | Fair Value, Inputs, Level 2 [Member]    
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]    
Short-term investments   1,325us-gaap_ShortTermInvestments
/ us-gaap_FairValueByAssetClassAxis
= us-gaap_VariableRateDemandObligationMember
/ us-gaap_FairValueByFairValueHierarchyLevelAxis
= us-gaap_FairValueInputsLevel2Member
Variable Rate Demand Obligation [Member] | Fair Value, Inputs, Level 3 [Member]    
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]    
Short-term investments      
Repurchase Agreements [Member]    
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]    
Short-term investments   236us-gaap_ShortTermInvestments
/ us-gaap_FairValueByAssetClassAxis
= us-gaap_RepurchaseAgreementsMember
Repurchase Agreements [Member] | Fair Value, Inputs, Level 2 [Member]    
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]    
Short-term investments   236us-gaap_ShortTermInvestments
/ us-gaap_FairValueByAssetClassAxis
= us-gaap_RepurchaseAgreementsMember
/ us-gaap_FairValueByFairValueHierarchyLevelAxis
= us-gaap_FairValueInputsLevel2Member
Repurchase Agreements [Member] | Fair Value, Inputs, Level 3 [Member]    
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]    
Short-term investments